Bolthole Index

Maricopa County, Arizona

Building permits, zoning and land rules in Maricopa County, Arizona

21Index Score / 100
#15 of 15 in Arizona

Unincorporated Maricopa County, Arizona requires a building permit for a home, issued and inspected by the county's Planning & Development Department under the county's adopted 2018 construction codes12. The Maricopa County Zoning Ordinance also applies to unincorporated land, with minimum lot sizes ranging from 6,000 square feet up to 190,000 square feet depending on the district34. Living in an RV, travel trailer, or motor home on your own land is generally prohibited outside a Temporary Use Permit for caretaker quarters5. Septic goes through the county's own Environmental Services Onsite Wastewater Program, delegated from the state, and only 28% of the county's soils are free of severe limitations for a conventional drain field67.

At a glance

Building permit
Required, issued by Planning & Development under the 2018 adopted construction codes12
Zoning
Yes; the Maricopa County Zoning Ordinance applies to unincorporated county land3
Minimum lot size
District-specific, from 6,000 sq ft up to 190,000 sq ft4
RV / camping trailer occupancy
Generally prohibited for living; allowed only as caretaker quarters with a Temporary Use Permit5
Manufactured home
Allowed with a development permit if built after 1976, on a permanent foundation8
Septic permit
Required; county Environmental Services issues Construction Authorizations on ADEQ's behalf9
Septic soils
Only 28% of soils are free of severe limits for a conventional drain field7
Owner-builder exemption
Available for a home built solely for your own occupancy, not for sale or rent10

Who to call

Planning & zoning

Maricopa County Planning & Development

Building permits, inspections, zoning administration, and Floodplain Use Permits for unincorporated Maricopa County

(602) 506-3301

301 W. Jefferson St., Suite 170, Phoenix, AZ 85003

Online permits →

Septic permits

Maricopa County Environmental Services - Onsite Wastewater Program

Onsite wastewater (septic) applications, Construction Authorizations, and final inspections for unincorporated Maricopa County, issued on ADEQ's behalf

602-506-6666

[email protected]

Online permits →

Contact details are copied from each office’s official page and were checked against it on September 28, 2026.

Do you need a building permit in Maricopa County, Arizona?

Unincorporated Maricopa County requires a building permit before you build a home, issued and inspected by the county's Planning & Development Department111. The county has adopted the 2018 International Building Code, 2018 International Residential Code, 2018 International Plumbing, Mechanical and Fuel Gas Codes, and the 2017 National Electrical Code, with amendments effective since 20222. Arizona law lets a property owner do the work personally, or through the owner's own employees, without a contractor's license, as long as the home is intended solely for the owner's own occupancy and is not offered for sale or rent within a year of completion1012. That owner-builder exemption is only from contractor licensing; it does not waive the building permit, inspections, or any zoning requirement13. A building permit does not override a homeowners association's CC&Rs, so check any recorded HOA restrictions separately before you build14.

Who is the Maricopa County building department, and how do you reach them?

Maricopa County Planning & Development, at 301 W. Jefferson St., Suite 170 in Phoenix, regulates residential and commercial development activity and issues building permits in the unincorporated areas of the county11. The same department handles floodplain permits for unincorporated county land: citizens should contact Planning & Development, not the county's Flood Control District, for floodplain regulation and Floodplain Use Permits1115. Applications go through the county's online Permit Center, where you set up an account, answer the decision engine's questions, submit required documents, and pay any upfront fees before the project is accepted for review14. Fees vary by project type, valuation, and site-specific factors rather than a flat published schedule16.

Does Maricopa County have zoning?

Yes. The Maricopa County Zoning Ordinance regulates growth and development on all unincorporated county land, with rural, residential, commercial, and industrial districts and their own development standards317. Minimum lot size depends entirely on the district: the most rural residential district requires 190,000 square feet, while the tightest residential district allows lots as small as 6,000 square feet4. The ordinance generally prohibits living, sleeping, or housekeeping in a mobile home, travel trailer, camping trailer, truck camper, or motor home on your land; the one exception is a Temporary Use Permit for caretaker's quarters, granted only where unusual conditions justify an on-site caretaker, and limited to one additional caretaker dwelling per property5. A manufactured home can be placed on a rural or residential lot with a development permit if it was built after 1976 and sits on a permanent foundation8. Accessory dwelling units are broadly allowed on any single-family-zoned lot without a public hearing or variance: at least one attached and one detached ADU where a single-family home is allowed, with a size cap of 75% of the primary home or 1,000 square feet on lots under an acre18. The current ordinance has no defined "tiny house" category or minimum-dwelling-floor-area rule, so a small permanent home is treated like any other single-family dwelling subject to the same permit and zoning-district rules.

How do septic permits work in Maricopa County?

Arizona's environmental agency, ADEQ, delegates onsite wastewater permitting to each of its 15 counties, and in Maricopa County that means the county's own Environmental Services Department issues the Construction Authorization required before you install a system9196. Soil conditions matter here: only 28% of Maricopa County's soils are free of severe limitations for a conventional septic drain field, so the required Phase I site and soils evaluation, including test holes at least 12 feet deep, is a real early step rather than a formality720. After construction, a final inspection covering septic-tank watertightness and open trenches is required before you can request Discharge Authorization20. A composting toilet rated below 3,000 gallons per day is a recognized permit category under the county's onsite wastewater program, but it still requires an application, review, and fees like any other system21. If you plan a private well, Arizona requires a Notice of Intent to Drill filed with the state water resources department before drilling, and a parcel of 5 acres or less intended for domestic use needs county or local health review first22.

Can you live in an RV or tiny home on your land in Maricopa County?

Generally, no. The Maricopa County Zoning Ordinance states that a mobile home, travel trailer, camping trailer, truck camper, or motor home may not be occupied for living, sleeping, or housekeeping purposes on unincorporated county land5. The one narrow exception is a Temporary Use Permit for caretaker quarters, available only where unusual site conditions justify having a caretaker live on the property, and limited to one additional caretaker dwelling unit per property5. Parking a travel trailer or similar vehicle outside a garage without living in it is a separate matter: it must sit in the rear or side yard, outside the required front yard, except for loading or unloading of up to 72 hours5. There is no current tiny-house category in the zoning ordinance, so a small permanent dwelling is treated like any other single-family home subject to the same building-permit and zoning-district process117. A manufactured home is the more realistic path to smaller-footprint housing here, allowed with a development permit if built after 1976 and set on a permanent foundation8.

Building a home in Maricopa County: the steps, in order

  1. Confirm your parcel's zoning district and minimum lot size before you buy; requirements range from 6,000 square feet up to 190,000 square feet depending on the district4.
  2. Get a Phase I site and soils evaluation for septic early; only 28% of county soils are free of severe limitations for a conventional drain field720.
  3. If you plan a private well, file a Notice of Intent to Drill with the state, and expect county or local health review first if the parcel is 5 acres or less and for domestic use22.
  4. Apply for your building permit through the county's online Permit Center, including any required drainage clearance1114.
  5. If any part of the site is in a designated floodplain, get a Floodplain Use Permit from Planning & Development before you build, grade, or fill1115.
  6. Schedule your septic construction authorization and final inspection, including tank watertightness and open-trench checks, before requesting Discharge Authorization20.
  7. If you are acting as your own contractor, keep records showing the home is for your own occupancy and not offered for sale or rent within a year of completion, to support the owner-builder exemption1012.

What to check before you buy land in Maricopa County

Public land: 54.6% of Maricopa County is federal land, so many rural-feeling parcels sit adjacent to public land with its own access rules; confirm your parcel's boundaries and easements before you buy23. Soils and septic: with only 28% of the county's soils free of severe septic limitations, budget for a site evaluation before you count on a parcel supporting a conventional system7. Heat and drought: Maricopa County is projected to average 122.2 days a year at or above 100°F by mid-century, and has been in severe drought in 30.4% of recent years, both of which shape water storage and cooling costs for any rural or off-grid plan2425. Zoning district: confirm which residential or rural zoning district applies to a specific parcel, since minimum lot size ranges from 6,000 to 190,000 square feet4. Subdivision: if you are buying land that was recently divided, confirm it went through the county's preliminary and final plat process and is recorded with the County Recorder26. Taxes: the effective property tax rate in Maricopa County is about 0.5%, with a typical annual bill near $1,9652728.

Watch-outs

  • Maricopa County generally prohibits living in an RV, travel trailer, or motor home on your own land; the only exception is a Temporary Use Permit for caretaker quarters under unusual conditions5.
  • Short-term rentals are tightly restricted in unincorporated Maricopa County: only one whole-unit rental per parcel, no renting by the room, and an owner generally must live on-site if the rental is an accessory dwelling unit unless the County approved that ADU on or before September 13, 202429.
  • Only 28% of the county's soils are free of severe limitations for a conventional septic drain field, so budget for site testing and possibly an alternative system before you buy7.

Sources

  1. Maricopa County Planning & Development - Construction Permit Information (2026 county census)
  2. Adopted Regulations, quoted and re-checked
  3. Maricopa County Zoning Ordinance Update (2026 county census)
  4. Maricopa County Zoning Ordinance, quoted and re-checked
  5. Maricopa County Zoning Ordinance, quoted and re-checked
  6. Maricopa County Environmental Services - Onsite Wastewater Program (swm.maricopa.gov)
  7. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
  8. Planning & Development Frequently Asked Questions, quoted and re-checked
  9. Site Investigation and Soils Evaluation for an On-Site Wastewater Treatment Facility Instructions (2026 county census)
  10. Maricopa County - Construction Permit Information (2026 county census)
  11. Maricopa County Planning & Development (hsd.maricopa.gov)
  12. 32-1121 - Persons not required to be licensed; penalties; applicability, quoted and re-checked
  13. Persons not required to be licensed; penalties; applicability (Arizona statewide rule), quoted and re-checked
  14. Residential Construction, quoted and re-checked
  15. Permits, quoted and re-checked
  16. Fee Schedule and Estimators, quoted and re-checked
  17. Maricopa County Zoning Ordinance Update, quoted and re-checked
  18. Maricopa County Zoning Ordinance, quoted and re-checked
  19. Onsite Wastewater Treatment Facility | ADEQ (Arizona statewide rule), quoted and re-checked
  20. Onsite Wastewater Forms / Applications, quoted and re-checked
  21. Site Investigation and Soils Evaluation for an On-Site Wastewater Treatment Facility Instructions, quoted and re-checked
  22. Permitting and Wells Overview, quoted and re-checked
  23. Federal land share: Bolthole Index county data
  24. Projected mid-century days at or above 100°F: Bolthole Index county data
  25. Share of years in severe drought: Bolthole Index county data
  26. Maricopa County Subdivision Regulations, quoted and re-checked
  27. Effective property tax rate: Bolthole Index county data
  28. Median property tax bill: Bolthole Index county data
  29. Maricopa County Zoning Ordinance, quoted and re-checked

Written September 28, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

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Maricopa County in Arizona

21
County map
Maricopa County highlighted among the Arizona counties · colored by Index score

How Maricopa County scores

Seclusion12100% ev.
Self-Sufficiency1398% ev.
Admin Boringness48100% ev.
Durability35100% ev.
Property Autonomy65100% ev.
Carry Cost67100% ev.

Evidence strength: 99%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$461kTypical home
0.5%Property tax
$7,203Land / acre
8.6"Annual rain
30.4% of yrsSevere drought
122.2 / yr (+32)Mid-century 100°F days
74.4 daysMid-century dry spell
1.03" (+7.8%)Mid-century 1-day rain
1.11×Wildfire change factor
100%Forward climate coverage
$1,249Home insurance / yr
2.8% / yrInsurance growth
1.56%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
5,376,074People within 2 hr
515,620Radius comparison (15 mi)
498.4People / sq mi
54.6%Federal land
66.8%Land at 15% slope or less
28%Septic soil without severe limits
1,425,940 acWorkable land screen
4.9%Wooded land
6.2 tonsBiomass / forest ac
71.3°FAvg temp

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Answers from the rulebook for Maricopa County

What the ordinances and state agencies actually say — one answer per question, each quoted from the official source and independently re-checked.

Maricopa County rules

  • Building code adoptedAdopted (with conditions)

    Maricopa County Local Additions and Addenda and adopted national construction codes administered by the county.

    • The 2018 International Green Code and 2018 International Energy Conservation Code are voluntary.
    • The codes with amendments became effective 30 days after Board of Supervisors approval, with a grace period through December 30, 2022 before mandating the new codes.
    • The cited official materials show a later 2024-code amendment proposal, but do not state that the 2024 codes had been adopted by the retrieval date.

    Board of Supervisors approval date: 2022-08-17 · effective period after approval: 30 days (with a grace period through 2022-12-30 before mandating new codes) · International Building Code edition: 2018 · International Residential Code edition: 2018 · National Electrical Code edition: 2017

    “Text Amendment to the Maricopa County Local Additions & Addenda to adopt and amend the following construction safety codes: 2018 International Building Code, 2018 International Residential Code, 2018 International Plumbing Code, 2018 International Mechanical Code, 2018 International Fuel Gas Code, 2018 International Green Code (voluntary), 2018 International Energy Conservation Code (voluntary), 2018 International Existing Building Code, and 2017 National Electric Code. These codes with amendments become effective 30 days after BOS approval with a grace period through 30 December 2022 before mandating new codes.”
  • County-wide zoningPresent (with conditions)

    Maricopa County Zoning Ordinance regulation of land in the unincorporated parts of Maricopa County.

    • The ordinance applies to unincorporated areas; incorporated municipalities may administer their own land-use regulations.
    • The MCZO includes rural, residential, commercial, and industrial zoning districts and development standards.
    “The Maricopa County Zoning Ordinance (MCZO) regulates the growth and development of land within the unincorporated parts of the County. The MCZO includes zoning districts for rural, residential, commercial, and industrial land uses and establishes development standards in the interest of protecting the public health, peace, safety, comfort, convenience, and general welfare of the residents.”
  • Local zoningVaries (with conditions)

    Local zoning across Maricopa County, aggregated across county-administered unincorporated territory and incorporated municipalities.

    • Maricopa County administers the MCZO in the unincorporated area only.
    • The county source does not establish that Maricopa County administers zoning inside incorporated municipalities; municipal rules may apply there.
    • Within the unincorporated area, the MCZO regulates rural, residential, commercial, and industrial zoning districts and development standards.
    “The Code Compliance Division only has jurisdiction over zoning violations within the unincorporated areas of Maricopa County. [...] For more information on reporting a violation outside the jurisdiction of Maricopa County, please select the appropriate city or town listed below:”
  • Zoning districtsPublished

    Land within the unincorporated parts of Maricopa County governed by the Maricopa County Zoning Ordinance.

    • The ordinance includes rural, residential, commercial, and industrial zoning districts and development standards.
    • The December 10, 2025 ordinance was approved by the Board of Supervisors on December 10, 2025; the official update page states that it replaced the prior ordinance and incorporated changes concerning accessory dwelling units and short-term rentals.
    • Incorporated municipalities may administer their own zoning rules.
    “The Maricopa County Zoning Ordinance (MCZO) regulates the growth and development of land within the unincorporated parts of the County. The MCZO includes zoning districts for rural, residential, commercial, and industrial land uses and establishes development standards in the interest of protecting the public health, peace, safety, comfort, convenience, and general welfare of the residents.”
  • Minimum lot sizeDistrict specific (with conditions)

    Residential and rural zoning districts in the unincorporated area of Maricopa County.

    • The applicable minimum depends on the zoning district.
    • Multiple-family districts also impose minimum lot area per dwelling unit.
    • The ordinance states the zoning ordinance regulates the entire unincorporated area; incorporated municipalities may apply their own rules.

    minimum lot area by district: RU-190: 190,000 sq. ft.; RU-70: 70,000 sq. ft.; RU-43: 43,560 sq. ft.; R1-35: 35,000 sq. ft.; R1-18: 18,000 sq. ft.; R1-10: 10,000 sq. ft.; R1-8: 8,000 sq. ft.; R1-7: 7,000 sq. ft.; R1-6: 6,000 sq. ft.; R-2 through R-5: 6,000 sq. ft. per lot sq. ft. · minimum lot area per dwelling unit: R-2: 4,000 sq. ft.; R-3: 3,000 sq. ft.; R-4: 2,000 sq. ft.; R-5: 1,000 sq. ft. sq. ft.

    “Lot Area Minimum (sq. ft.) 190,000 70,000”
  • Living in an RVLimited

    Occupancy of mobile homes, travel trailers, camping trailers, truck campers, and motor homes for living, sleeping, or housekeeping purposes in unincorporated Maricopa County.

    • The MCZO generally prohibits occupancy for living, sleeping, or housekeeping purposes.
    • Mobile homes and travel trailers intended for temporary housing require a Temporary Use Permit.
    • A recreational vehicle may serve as caretaker quarters only through a Temporary Use Permit and only when unusual conditions justify on-site caretaker residency.
    • Only one additional caretaker dwelling unit may be permitted on a property.
    • Travel trailers and other listed vehicles stored outside a garage or carport must be in the rear or side yard, outside the required front yard except for loading or unloading up to 72 hours, with a five-foot clear path around structures.

    maximum loading/unloading period: <= 72 hours (does not authorize occupancy for living, sleeping, or housekeeping purposes)

    “At no time shall the mobile home, travel trailer [...] be occupied”
  • Manufactured homesLimited

    Placement and residential occupancy of manufactured homes on rural or residential lots in unincorporated Maricopa County.

    • The manufactured home must be built after June 15, 1976.
    • A development permit is required for placement on a rural or residential lot.
    • The unit must be on a permanent foundation system, either a slab/stem wall foundation or a state-approved system.
    • Re-roofing, re-siding, and structural additions must conform to the Building Code and Local Additions and Addenda.
    • Manufactured homes are also permitted in a mobile home park.
    • A multi-sectional manufactured home may be placed wherever a site-built home is permitted; a single-wide may also be placed in a mobile-home subdivision or mobile-home park; a building permit is required.

    manufactured-home construction date: > 1976-06-15 (county FAQ states built after June 15, 1976)

    “Any rural or residential lot in the unincorporated area of the county may be issued a development permit [...] built after June 15, 1976.”
  • Accessory dwellingsAllowed (with conditions)

    Accessory dwelling units on lots or parcels zoned for single-family residential use in unincorporated Maricopa County.

    • ADUs are permitted on any lot or parcel zoned for single-family residential use; no public hearing, variance, or special permit is required.
    • At least one attached and one detached ADU are permitted where a single-family dwelling is allowed.
    • On a lot or parcel of one acre or larger, at least one additional detached ADU is permitted if at least one ADU is deed-restricted affordable and rented to households earning up to 80% of area median income.
    • No ADU may exceed the principal dwelling in size.
    • On lots or parcels under one acre, an ADU is limited to 75% of the primary dwelling or 1,000 square feet, whichever is less.
    • ADUs may be leased or occupied independently as long-term rental housing.
    • Detached ADUs have five-foot side and rear lot-line setbacks, a maximum 18-foot height when encroaching into required side or rear yards, and may occupy no more than 30% of any required yard.
    • All ADUs must share one street access point with the primary residence.
    • No more than one ADU may be used as a short-term rental.

    additional detached ADU affordability threshold: <= 80 percent of area median income (applies to at least one ADU when using the additional detached ADU allowance on a lot or parcel of at least one acre) · ADU size on lot or parcel under one acre: 75% of primary dwelling or 1,000 square feet, whichever is less · detached ADU side/rear setback: >= 5 feet · detached ADU height when encroaching into required side/rear yard: <= 18 feet

    “ADUs may be leased or occupied independently”
  • Who permits septicCounty

    On-site wastewater systems in unincorporated Maricopa County administered through the Maricopa County Environmental Services Department Onsite Wastewater Program.

    • The cited process is for conventional onsite wastewater treatment facilities; alternative systems may have additional design or review requirements.
    • The source identifies MCESD as conducting site and soils evaluations, reviewing NOID submissions, issuing Construction Authorizations, and conducting final inspections.
    “Review of the NOID submission [...] is done by MCESD.”
  • Septic permitRequired

    Construction or other covered permitting actions for onsite wastewater systems in Maricopa County.

    • The county's listed onsite wastewater applications include alteration, closure or abandonment, minor plan review, Phase I site and soils evaluation, Phase II conventional system design, Phase II alternative systems design, septic permit, and notice of transfer.
    • Permit applications are submitted through the Maricopa County Permit Center.
    • For subdivisions using onsite wastewater, a geologic report and approval of sanitary facilities are required before the health certificate is issued.
    “To apply for the following permits listed below, visit our Permit Center page. [...] Septic Permit Application”
  • Septic inspectionRequired

    Site, construction, and final inspections for onsite wastewater systems in Maricopa County's county-administered service area.

    • The Phase I process requires an inspection request after test holes are prepared.
    • Final inspection is scheduled through a Request for Discharge Authorization.
    • Final inspection verifies installation against the Construction Authorization and includes septic-tank watertightness and open-trench inspections.
    • Deficiencies require correction and re-inspection; alternative systems may require stamped and signed as-built drawings.

    site evaluation test holes: 3 holes (Two are in the proposed primary disposal area and one is in the reserve area.) · test-hole depth: >= 12 feet (The instructions also state the holes must be 5 feet deeper than the proposed overall disposal-field depth.) · onsite system site inspection fee: 325 USD (The fee schedule lists an onsite additional inspection at $325 as well.)

    “To request a final inspection, complete a Request for Discharge Authorization (PDF) form”
  • Off-grid sanitationAllowed (with conditions)

    Composting toilets and other onsite sanitation systems regulated through Maricopa County's Onsite Wastewater Program.

    • The county's licensing schedule lists composting toilets with less than 3,000 gallons per day as a permit category.
    • The system remains subject to county application, review, fees, and applicable onsite wastewater requirements.
    • The cited source does not establish unrestricted use or exemption from permitting.

    composting toilet flow: < 3000 gallons per day

    “Composting Toilet (less than 3,000 gallons per day)”
  • Mandatory utility hookupConditional

    Projects or sites seeking entitlement for development and use of sanitary facilities in unincorporated Maricopa County.

    • The project must provide either connection to a gravity sewer system or permitted onsite wastewater treatment facilities.
    • For utility-provided water or reclaimed water, a Water Service Agreement signed by the utility is required for submission to MCESD's Subdivision & Infrastructure Program.
    • For utility-provided wastewater service, a Capacity Assurance Form issued by the utility is required.
    • The cited source is a project-specific MCESD review and does not establish that every parcel countywide has access to or must connect to a particular utility.
    “require connection to a gravity sewer system or permitted onsite wastewater treatment (septic) facilities to support the development.”
  • Agricultural exemptionConditional

    Agricultural uses in unincorporated Maricopa County, including uses in any county zoning district.

    • A Land Use (Agricultural Exemption) application must be administratively approved.
    • A commercial agricultural classification from the Assessor's Office is a prerequisite to administrative approval.
    • The exemption does not cover non-agricultural structures or uses such as a single-family residence, swimming pool, or barbecue.
    • General agricultural purposes are described as eligible when the tract is five or more contiguous commercial acres.
    • Specific eligible categories include cropland of at least 20 aggregate acres; agricultural composting of at least 5 contiguous commercial acres; grazing land with at least 40 animal units on at least 5 contiguous commercial acres; and specified equine, commodity, and dairy operations meeting the listed acreage conditions.
    • Rodeo structures, mounted cowboy shooting, certain riding lessons, horse rentals, off-site trail staging, and feed stores or roadside stands selling products not produced on site are not exempted.

    general agricultural tract threshold: >= 5 contiguous commercial acres · cropland threshold: >= 20 aggregate acres · grazing threshold: >= 40 animal units (also requires at least 5 contiguous commercial acres)

    “Agricultural uses will be exempted from the MCZO in any zoning district if a Land Use (Agricultural Exemption) application is administratively approved.”
  • Subdividing landRegulated (with conditions)

    Subdivision of land within unincorporated Maricopa County.

    • The subdivider must comply with the County Subdivision Regulations.
    • Preliminary and final plat approval by the Department is required.
    • The approved plat must be filed and recorded with the Maricopa County Recorder's Office.
    • The regulations were adopted August 6, 1990, revised October 23, 2024, and revised January 9, 2026 to update references after the December 10, 2025 zoning ordinance update.

    required approvals: preliminary plat and final plat

    “These subdivision regulations shall apply to all subdivisions of land, as defined herein, located within unincorporated areas of the County.”
  • Driveway accessLimited

    Development or access requested on property owned by the Maricopa County Flood Control District, on property subject to District easements, or involving structures maintained by the District.

    • A Right-of-Way Use Permit is required before development or access is requested on covered District property, easements, or maintained structures.
    • This claim does not establish a countywide driveway-access requirement.
    “The Flood Control District requires a Right-of-Way Use Permit be obtained before any development or access requested on property that the District owns or has easements over and/or on structures it maintains.”
  • Building in a floodplainRequired

    Development within a designated or delineated floodplain in Maricopa County.

    • The requirement applies to building, grading, filling, installing walls or fencing, and any other man-made change within a designated floodplain.
    • If the watercourse is not delineated, delineation may be required; once delineated, a Floodplain Use Permit is required before development.
    • Written authorization is issued through a Floodplain Use Permit signed by the Floodplain Administrator.
    • Other applicable federal, state, and local permits may also be required.
    • Floodplain development remains subject to drainage and grading requirements.
    “you are required to obtain a Floodplain Use Permit before you build, grade, fill”
  • Short-term rentalsLimited

    Short-term rentals in the unincorporated area governed by the Maricopa County Zoning Ordinance adopted December 10, 2025.

    • An STR is a single-family dwelling or approved accessory dwelling unit rented for no more than 30 consecutive days.
    • If the property contains an accessory dwelling unit, the STR owner must reside on the property unless the County issued a certificate of occupancy, certificate of completion, or similar final approval for the ADU on or before September 13, 2024.
    • The STR must be rented as a whole unit to one party or individual; partial rentals by room or bed are prohibited.
    • Only one STR unit may be rented per parcel at a time.
    • Commercial events, public assembly, special gatherings, signage or site-specific websites suggesting commercial operation, and retail, food service, or other commercial enterprise from the STR are prohibited.
    • An STR may not be rented, leased, or occupied by a registered sex offender, and the renting party may not include such an individual.

    maximum rental duration: <= 30 consecutive days · STR units per parcel: 1 unit (At any given time.)

    “The STR must be rented as a whole unit to a single party or individual. Partial rentals (e.g., by the room or by the bed) are prohibited. Only one (1) STR unit may be rented per parcel at any given time.”
  • Permit feesVariable (with conditions)

    Planning and Development building, zoning, drainage, and related construction-permit fees in unincorporated Maricopa County.

    • Fees vary by project type, valuation, and the unique elements of the parcel or site.
    • Other County departments may conduct reviews and assess separate fees based on the level of review.
    • Initial or upfront fees are required when a project has been accepted for review.
    • All fees collected are applied toward the final cost of the permit.
    • Some permit types use the upfront fee as the full fee amount.
    “Fees will vary widely depending on the type of project, valuation, and all of the unique elements related to a particular parcel / site.”
  • Permit processPublished (with conditions)

    Residential construction permit applications in unincorporated Maricopa County.

    • Applicants must know the permit type, prepare site plans and required documents, provide contact, owner, and property information, meet document requirements, account for upfront fees if applicable, and determine lot coverage.
    • A Permit Center account is required before completing an application.
    • The Permit Center decision engine asks questions and prompts the applicant through the process.
    • Required PDF documents must be submitted and applicable upfront fees paid.
    • Building permits do not preclude enforcement of HOA CC&Rs.
    • Separate drainage requirements may apply.
    “You will complete the online application, submit required PDF documents and pay any upfront fees, if applicable.”

Arizona rules that apply here

  • Building permitRequired

    New construction, remodeling, alterations and additions for Arizona state, county, and public school buildings and grounds, and public buildings built in whole or in part with public monies.

    • Plans and specifications must be submitted to the state forester for review and approval before construction, except as provided in Arizona Revised Statutes § 37-1383(G).
    • For a one-phase permit application, construction may not commence until plans are approved and a permit is issued, unless the state forester has not acted within 60 days after receiving a valid application.
    • For a two-phase application, construction beyond phase-one constraints may not commence until plans are approved and a permit is issued, unless the state forester has not acted on phase two within 60 days after receiving a valid application.
    • Under § 34-461(D), subsections A and B do not apply to state-owned buildings except for the fire code in effect where the building is located.
    • Under § 34-461(D), the permitting process and fees do not apply to public-school-district-owned buildings in counties with populations greater than 750,000 and less than 2,000,000, except for the design and permitting process and any fee required by the applicable fire code.
    • State Department of Corrections facilities are exempt from the local fire code absent an intergovernmental agreement.
    • Buildings and properties owned by the Arizona Board of Regents or a university under its jurisdiction are exempt from city, town, county, or fire-district fire codes absent an intergovernmental agreement.

    one-phase application decision period: <= 60 days (Construction may commence if the state forester has not acted within 60 days after receiving a valid application.) · two-phase application final decision period: <= 60 days (Construction beyond phase-one constraints may commence if the state forester has not acted on phase two within 60 days after receiving a valid application.)

    “Construction may not commence until the plans have been approved and a permit has been issued”
    2 more reviewed findings on this topic
  • Owner-builder exemptionAvailable (with conditions)

    An owner who improves property or builds or improves structures or appurtenances and performs the work personally, through the owner's employees, or through duly licensed contractors, when the property is intended solely for the owner's occupancy and is not intended for public occupancy, sale, or rent.

    • The exemption is from Arizona contractor-licensing requirements under A.R.S. § 32-1121; it does not itself eliminate any local building-permit requirement.
    • The structure or appurtenance must be intended for occupancy solely by the owner.
    • The structure or appurtenance must not be intended for occupancy by members of the public as the owner's employees or business visitors.
    • The structure or appurtenance must not be intended for sale or rent.
    • Sale, rent, or an arrangement by which the owner receives compensation from occupancy or transfer is included in the statutory definition of sale or rent.
    • Sale or rent, or an offer of sale or rent, within one year after completion or issuance of a certificate of occupancy is prima facie evidence that the project was undertaken for sale or rent.

    one-year post-completion evidence period: 1 year (Applies to the statutory prima facie evidence rule concerning sale or rent.)

    “who do the work themselves, with their own employees or with duly licensed contractors”
    One more reviewed finding on this topic
    • Conditional — Owners improving property or building structures in Arizona under the contractor-licensing exemption in A.R.S. § 32-1121(A)(5).
      “Owners of property who improve such property or who build or improve structures or appurtenances on such property and who do the work themselves”
  • InspectionsRequired

    Construction inspections for Arizona public buildings and regularly scheduled fire-safety inspections for state-owned and county-owned public buildings and public and private school buildings.

    • Public buildings are subject to inspection during construction under the applicable building, plumbing, electrical, fire, and mechanical codes.
    • An intergovernmental agreement may allow a city, town, county, or fire district to conduct regularly scheduled fire-safety inspections for school-district or charter-school buildings.
    • The state fire marshal must establish a regularly scheduled fire-safety inspection program for all state- and county-owned public buildings and all public and private school buildings statewide, except private-school buildings in cities with populations of 100,000 or more.
    • The state fire marshal inspects other occupancies as necessary, except family dwellings with fewer than five residential dwelling units and occupancies in cities with populations of 100,000 or more.
    • State-owned buildings are exempt from § 34-461(A) and (B) except for the applicable fire code; the fire-code inspection authority remains applicable as stated by law.
    • State Department of Corrections facilities are exempt from local fire code absent an intergovernmental agreement.
    • A school district or charter school with an applicable intergovernmental agreement may choose the state fire marshal or the local government for plan review, permitting, related inspections, or regularly scheduled fire-safety inspections.

    private-school city population exception: >= 100000 persons (Private school buildings in cities with populations of 100,000 or more are excluded from the state fire marshal's regularly scheduled fire-safety inspection program.) · family-dwelling exception: < 5 residential dwelling units (Family dwellings having fewer than five residential dwelling units are excluded from the state fire marshal's necessary-inspection authority for other occupancies.)

    “Establish a regularly scheduled fire safety inspection program for all state and county owned public buildings and all public and private school buildings”
  • Certificate of occupancyLimited

    Public school district construction projects statewide when the particular project requires a certificate of occupancy.

    • The architect of record is responsible for signing the certificate of occupancy for public school district projects in counties with populations greater than 750,000 and less than 2,000,000.
    • The certificate-of-occupancy requirement remains subject to the applicable project code and local-government requirements; Arizona law does not impose a universal certificate-of-occupancy requirement for every building project.
    ““when such a certificate is required for that particular project””
  • SetbacksDistrict specific (with conditions)

    County zoning regulations in Arizona's unincorporated county zoning districts.

    • A county board of supervisors may establish setback lines through its zoning ordinance.
    • The applicable setback distance depends on the county zoning ordinance and district; this record does not supply a universal numeric setback.

    setback lines: established by applicable county zoning ordinance

    “shall provide for the establishment of setback lines”
  • Lot coverageDistrict specific (with conditions)

    County zoning regulations in Arizona's unincorporated county zoning districts.

    • A county board of supervisors may establish the percentage of a lot or parcel that may be covered by buildings.
    • The applicable percentage depends on the county zoning ordinance and district; this record does not supply a universal numeric percentage.

    maximum building lot coverage: percentage established by applicable county zoning ordinance percent

    “May establish the percentage of a lot or parcel that may be covered by buildings”
  • Building heightDistrict specific (with conditions)

    County zoning regulations governing the height and location of buildings in Arizona county zoning districts.

    • The applicable height standard depends on the county zoning ordinance and zoning district.
    • No universal statewide residential height limit was established by the reviewed statute.

    building height: regulated by applicable county zoning regulations

    “the height and location of buildings”
  • Camping on your landLimited

    Parking and camping along open roads in closed areas governed by A.R.S. § 17-452 restrictions.

    • Camping is allowed only along open roads in the specified closed areas.
    • No vehicle may be parked or operated more than 300 feet from the road.

    maximum distance from open road: <= 300 feet

    “Parking and camping shall be allowed along open roads in closed areas, except that no vehicle shall be parked or operated at a distance greater than three hundred feet from such roads.”
  • Well permitRequired

    Drilling a new groundwater well, or deepening or modifying an existing well, in Arizona, including Maricopa County.

    • A Notice of Intent to Drill must be filed with the Arizona Department of Water Resources before drilling, deepening, or modifying a well.
    • The filing must include the appropriate fee.
    • The authorization is valid for one year; after that, a new Notice of Intent must be filed.
    • A licensed well-drilling contractor must perform the work.
    • For domestic use on a parcel of 5 or fewer acres, the applicable county or local health authority must first review the application before submission to ADWR.
    • ADWR approval does not override other local requirements or ordinances that restrict well drilling.
    • Certain non-exempt wells in Active Management Areas may additionally require permits or groundwater rights.

    domestic parcel-size threshold for county or local health review: <= 5 acres (Applies when the well water is for domestic purposes.)

    “Prior to drilling a new well, or deepening or modifying an existing well, a person must file a Notice of Intent to Drill with the Department.”
  • Campground & park staysLimited

    The Arizona Recreational Vehicle Long-Term Rental Space Act applies to a recreational-vehicle space rented in a recreational-vehicle park or mobile-home park by the same tenant for more than 180 consecutive days, and to park-model or park-trailer spaces rented by the same tenant for more than 180 consecutive days.

    • For an ordinary recreational-vehicle space, the space must be rented under a rental agreement.
    • For a park model or park trailer, the chapter applies without regard to whether a rental agreement is executed.
    • The chapter does not apply to mobile homes, manufactured homes or factory-built buildings.
    • The chapter does not apply to a property with one or two recreational-vehicle rental spaces.

    occupancy duration: > 180 consecutive days · same tenant: required · property recreational-vehicle rental spaces: <= 2 spaces (The chapter does not apply to a property with one or two recreational-vehicle rental spaces.)

    “This chapter applies to, regulates and determines rights, obligations and remedies for a recreational vehicle space that is rented in a recreational vehicle park or”
    One more reviewed finding on this topic
    • Limited — Occupancy or use of a mobile home brought into Arizona, or movement of a mobile home from one Arizona mobile-home park to another Arizona mobile-home park.
      “unless it meets the standards adopted pursuant to this chapter and displays the proper state certificate.”
  • county zoning authorityGeneral

    Arizona county boards of supervisors adopting zoning for the county area outside incorporated municipalities, including unincorporated land.

    • The statutory definition of county area of jurisdiction is the part of the county outside the corporate limits of any municipality.
    • The zoning ordinance and rezonings and zoning-regulation amendments must be consistent with and conform to the adopted comprehensive plan.
    • The board must consider individual property rights and personal liberties before adopting a zoning ordinance.
    • The statute does not authorize dedications, exactions, fees, or other requirements not otherwise authorized by law.
    • The statute does not authorize regulation or restriction of railroad, mining, metallurgical, grazing, or general agricultural uses on tracts of five or more contiguous commercial acres, subject to the statutory cannabis and marijuana qualification.
    “Pursuant to this article, the board of supervisors may adopt a zoning ordinance in order to conserve and promote the public health, safety, convenience and general welfare.”
  • county building authorityGeneral

    Arizona county boards of supervisors requiring building permits and adopting building, related, and fire-prevention codes for construction in unincorporated areas, including residential construction.

    • Except in cities and towns with an ordinance relating to building permits, the board of supervisors shall require a permit for construction or additions exceeding $1,000 within its jurisdiction.
    • A county building code under section 11-861 applies to unincorporated areas of the county so zoned, and the board may exempt areas zoned rural or unclassified.
    • Building codes may be adopted by reference only after notice and hearings before the county planning and zoning commission and board of supervisors.
    • Authorized building, electrical, plumbing and mechanical codes must be adopted by a qualifying national code organization or by the largest city in the county; if a city code is adopted, the county must adopt notified changes within 90 days or terminate the adopted city code.
    • A fire-prevention code may be adopted in unincorporated areas where a fire district has not adopted a nationally recognized fire code; it remains effective until a fire district is established and adopts an applicable code.
    • The board may adopt a current wildland-urban interface code using written public-participation procedures.
    • Certain single-family and two-family residential sprinkler requirements are restricted, subject to the statutory exception for codes adopted before December 31, 2009.
    • A county may not deny a building permit based on the proposed capable and authorized utility provider, and may not require a transaction privilege tax or business license as a permit condition.
    • A county may recover reasonable costs associated with reviewing and issuing a building permit.

    building permit construction-cost threshold: > 1000 USD (The requirement does not apply in cities and towns that have an ordinance relating to issuance of building permits.) · city-code change adoption deadline: 90 days (If the county adopts a city code and does not adopt the same notified change within 90 days, it must terminate the adopted city code.) · preexisting sprinkler-code exception date: 2009-12-31 (The statutory sprinkler restriction does not apply to a code or ordinance requiring sprinklers in a residence that was adopted before December 31, 2009.)

    “In any county that has adopted zoning pursuant to this chapter, the board of supervisors may adopt and enforce, for the unincorporated areas of the county so zoned, a building code and other related codes to regulate the quality, type of material and workmanship of all aspects of construction of buildings or structures, except that the board may authorize that areas zoned rural or unclassified may be exempt from the provisions of the code adopted.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission — ask the county directly.

  • Minimum dwelling size — Minimum floor area or dwelling-size requirements for residential dwellings in unincorporated Maricopa County.
  • Tiny homes — Occupancy of tiny homes in unincorporated Maricopa County.

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Water rights & wells in Maricopa County

Whether a new home can legally get its own water here — the sub-state groundwater regime, from Arizona’s water agency.

Managed area

Groundwater is actively managed here, but a small household well is generally still available.

Household wellExempt — no permit or water right

Small non-irrigation 'exempt' wells (pump capacity 35 gpm or less) are allowed statewide, including inside Active Management Areas and INAs, but must be registered with ADWR; outside any AMA/INA groundwater is essentially rule of capture. Inside an AMA a new subdivision or large use must show an Assured Water Supply.

Limit: exempt well = pump capacity 35 gpm or less (A.R.S. §45-454)

Arizona Dept of Water Resources — Exempt Well ↗
  • Phoenix Active Management Areamajority of county

    New subdivisions and large groundwater uses must demonstrate an Assured Water Supply and obtain ADWR authorization; small domestic exempt wells (≤35 gpm) still allowed but must be registered.

    Arizona Dept of Water Resources — AMA Overview ↗
  • Harquahala Irrigation Non-Expansion Arealocalized of county

    Irrigation of new acreage is prohibited; no AMA-style Assured Water Supply requirement; domestic exempt wells (≤35 gpm) still allowed.

    Arizona Dept of Water Resources — Harquahala INA ↗

Prior-appropriation state (first in time, first in right). Groundwater rules change and basin boundaries follow the aquifer, not the county line — confirm current well and appropriation rules with the Arizona state water agency before you buy or drill.Groundwater governance as of Jul 2026, cited to each administering agency.

Living off-grid in Maricopa County, Arizona

Is Maricopa County a good place to live off-grid or homestead?

Maricopa County scores 21/100 on the Bolthole Index, a weak county profile. Its strengths: manageable long-term carry cost and a stronger property-autonomy legal backdrop. Watch-outs: about 515,620 people within 15 miles and weak self-sufficiency basics: only 8.6″ of rain a year, in severe drought 30.4% of years.

Do you need a building permit in Maricopa County, Arizona?

Maricopa County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Maricopa County Environmental Services Department (ADEQ-delegated). Owner-builders may act as their own contractor to build their home. These answers are quoted from official sources and independently re-checked. Rules change and cities within the county differ — always confirm with the county before you buy or build.

Can you live in an RV or tiny home on your land in Maricopa County?

Living in an RV on your own land in Maricopa County is limited to specific cases: Occupancy of mobile homes, travel trailers, camping trailers, truck campers, and motor homes for living, sleeping, or housekeeping purposes in unincorporated Maricopa County. The MCZO generally prohibits occupancy for living, sleeping, or housekeeping purposes. Mobile homes and travel trailers intended for temporary housing require a Temporary Use Permit. Confirm with the county before relying on it.

How much does land cost in Maricopa County, Arizona?

Land in Maricopa County runs about $7,203 per acre, based on the latest county data.

What is the water situation in Maricopa County?

Maricopa County gets about 8.6" of rain a year, with severe drought in roughly 30.4% of years. On water rights, Maricopa County lies in the Phoenix Active Management Area — New subdivisions and large groundwater uses must demonstrate an Assured Water Supply and obtain ADWR authorization; small domestic exempt wells (≤35 gpm) still allowed but must be registered..

How remote is Maricopa County?

A typical private-land location has about 515,620 people within 15 miles and 6,354,954 within 100 miles. These radius catchments are the published fallback where road routing is unavailable.

Off-grid gear

Going off-grid in Maricopa County means bringing your own water and power. The kit we’d start with:

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How Maricopa compares in Arizona

Compare side-by-side →See all 15 Arizona counties ranked →