Monterey County, CA Building Permits, Zoning & Septic

Unincorporated Monterey County, California requires a construction permit for nearly any building project, issued through the county's Housing & Community Development Building Services office¹. The county also zones all unincorporated land, with separate inland rules under Title 21 and coastal rules under Title 20 that set lot size, setbacks and allowed uses². Septic systems go through the county's Environmental Health Bureau, and only 2.6% of Monterey County's soils are rated free of severe limits for a conventional drain field, so plan on a site evaluation and likely an engineered system³.

At a glance

Building permit: Required in unincorporated Monterey County for nearly any structure¹
Zoning: Yes, countywide — Title 21 inland, Title 20 coastal²
Septic authority: Monterey County Health Department, Environmental Health Bureau⁴
Septic soils: Only 2.6% of soils rate free of severe limits for a conventional drain field³
Owner-builder: Allowed, with conditions on paying unlicensed workers⁵
RV living: Prohibited as a dwelling on private property, even short-term⁶
Tiny / manufactured home: Allowed as an ADU in specific coastal zoning districts, but the ordinance is not yet in effect⁷
Minimum lot size: District-specific, from 5,000 sq ft up to 160 acres⁸

Who to call

Building permits

Monterey County Housing & Community Development (HCD) — Building Services

Construction permits, plan check and building inspections for unincorporated Monterey County

(831) 755-5025

1441 Schilling Place, 2nd Floor, Salinas, CA 93901

Planning & zoning

Monterey County HCD — Planning Services

Zoning determinations and discretionary planning permits for unincorporated Monterey County

(831) 755-5025

1441 Schilling Place, 2nd Floor, Salinas, CA 93901

Septic permits

Monterey County Health Department — Environmental Health Bureau (Land Use)

OWTS (septic system) permit review, approval and inspection for unincorporated Monterey County

(831) 755-4505

1270 Natividad Road, Salinas, CA 93906

Floodplain permits

Monterey County HCD Permit Center (floodplain determinations)

Determines whether a parcel is in a FEMA Special Flood Hazard Area and administers Monterey County Code Chapter 16.16 for unincorporated Monterey County

(831) 755-5025

1441 Schilling Place, 2nd Floor, Salinas, CA 93901

Roads & driveways

Monterey County HCD Development Services — Encroachment Permits

Issues encroachment permits for driveways and other work within county road rights-of-way in unincorporated Monterey County

(831) 755-5025

1441 Schilling Place, 2nd Floor, Salinas, CA 93901

Contact details are copied from each office’s official page and were checked against it on September 24, 2026.

Do you need a building permit in Monterey County, California?

Unincorporated Monterey County requires a construction permit for nearly any structure, including a new home, an addition or most outbuildings¹. The county's own guidance for property owners is direct: constructing almost any structure will require a construction permit, and some uses and structures also need a separate planning (discretionary) permit even when a construction permit is not required⁹. Which permits apply depends on the zoning district and the proposed use, since Monterey County zones all unincorporated land under separate inland (Title 21) and coastal (Title 20) rules¹⁰. California's statewide Building Standards Code, the baseline every county building department enforces, moved to its 2025 edition for permit applications filed on or after January 1, 2026¹¹. Call Building Services before you buy: staff can tell you by phone or in person whether a specific parcel and project need a construction permit, a planning permit, or both⁹.

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

Monterey County's building department is Housing & Community Development (HCD) Building Services, part of the county's Permit Center at 1441 Schilling Place, 2nd Floor, Salinas, CA 93901⁹. Reach the Permit Center at (831) 755-5025; the county's own FAQ page gives Permit Center hours as 8 am to 4 pm, Monday through Friday⁹. The same Permit Center houses Planning Services, so a call to (831) 755-5025 can route you to either building or planning staff depending on what your project needs¹². Development Services, also based at the Schilling Place office, issues encroachment permits for any driveway or other work that crosses a county road right-of-way¹³. If a parcel sits near mapped water, Permit Center staff at the same office determine whether it falls inside a FEMA Special Flood Hazard Area before you design a foundation¹⁴.

Does Monterey County have zoning?

Monterey County zones every unincorporated parcel, with Title 21 setting standards for inland areas and Title 20 for the coastal zone². Minimum lot size runs from about 5,000 square feet in a High Density Residential district up to 40-160 acres in Farmland, Rural Grazing or Permanent Grazing districts, so the zoning district controls what you can build far more than the county's overall rural character does⁸. Setbacks are also district-specific: an inland Rural Density Residential lot needs a 30-foot front setback and 20-foot side and rear setbacks, while Medium and High Density Residential districts allow a 20-foot front setback and a 5-foot side setback¹⁵. Lot coverage limits range from as little as 5% in Farmland and Rural Grazing districts up to 60% in High Density Residential and Mixed Use districts¹⁶. A manufactured home or tiny home can be approved as an accessory dwelling unit in specific coastal zoning districts if it meets the state's Health and Safety Code Section 18007 standard, but Monterey County's own ordinance states this coastal ADU rule will not take effect until the Coastal Commission certifies it and the Board of Supervisors confirms that action, so confirm current status with Planning Services before you count on it⁷.

How do septic permits work in Monterey County?

Septic systems in unincorporated Monterey County go through the county's Environmental Health Bureau under a Local Agency Management Program the Central Coast Regional Water Quality Control Board approved in May 2018⁴. An OWTS (onsite wastewater treatment system) installation permit from the county is required for any domestic wastewater discharge of 10,000 gallons per day or less, which covers essentially every single-family home¹⁷. Only 2.6% of Monterey County's soils are rated free of severe limits for a conventional septic drain field, so most parcels will need a full site evaluation, soil profile analysis and percolation test, and many will need an engineered or mound system rather than a standard gravity drain field³. Land Use, the Environmental Health Bureau's liaison program, reviews and approves OWTS permit applications and works closely with HCD on building-permit conformance¹⁸. Reach Land Use at 1270 Natividad Road, Salinas, CA 93906, (831) 755-4505¹⁸. The county does not run a universal periodic inspection program for every conventional system, but it can require an operating permit when it determines routine monitoring or maintenance is necessary¹⁹.

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

No, not as a full-time dwelling. Monterey County's own guidance is unambiguous: it is illegal to occupy, use, rent or live in any trailer, camper, RV or boat as a dwelling or temporary guest room while parked or stored on private property in the unincorporated county, even for a short time⁶. California law reinforces this statewide: RVs are not intended for occupancy as a permanent dwelling, and unless a local ordinance says otherwise, they may be occupied only in mobile home parks or special occupancy parks²⁰. A manufactured home can be occupied inside or outside a licensed mobile home park under the state Mobilehome Parks Act, and in specific Monterey County coastal zoning districts a manufactured home or tiny home meeting Health & Safety Code Section 18007 can also be approved as an accessory dwelling unit once the county's coastal ADU ordinance takes effect²¹. A tiny home that does not qualify as a manufactured home, factory-built housing, recreational vehicle or approved ADU, and that does not otherwise meet the California Building Standards Code, is a noncomplying structure that cannot legally be occupied in Monterey County²². Ask Planning Services which classification and zoning district apply to your parcel before you buy an RV, tiny home or manufactured home to live in while you build¹².

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

Confirm the zoning district and the lot-area, setback and coverage standards for the parcel by calling HCD Planning Services at (831) 755-5025¹².
If the parcel is near mapped water, ask Permit Center staff at 1441 Schilling Place whether it falls inside a FEMA Special Flood Hazard Area before you design a foundation¹⁴.
Order an OWTS feasibility report from a qualified professional and submit it to the Environmental Health Bureau's Land Use program, since all subdivision and single-family dwelling proposals are reviewed for adequate water supply and wastewater-disposal feasibility²³.
Apply for a construction permit — and, if your use or structure needs one, a separate planning permit — through HCD Building Services⁹.
If your driveway will cross a county road right-of-way, apply for an encroachment permit from Development Services before you start excavation¹³.
Decide whether to build as an owner-builder: Monterey County recognizes owner-builder permits, but paying an unlicensed person more than $500 for construction work makes you an employer with added legal responsibilities²⁴.

What to check before you buy land in Monterey County

Monterey County sits about 24 miles from the nearest metro area, with a countywide population density of 131 people per square mile, so how rural a parcel feels depends heavily on which part of the county it's in²⁵²⁶. About 45% of the land is wooded and roughly a quarter sits at a gentle 15% slope or less, so check a specific parcel's terrain and tree cover, not just the county average, before assuming it's buildable²⁷²⁸. Federal land covers about 26% of the county, so confirm a parcel's boundaries against public land before you buy²⁹. The county gets about 21 inches of rain a year and has seen severe drought in roughly a third of recent years, which matters for a private well³⁰³¹. Typical home value here is $854,719 and farmland runs about $12,799 an acre, well above what many rural buyers expect, and a typical property tax bill is $4,782 a year at an effective rate of 0.7%³²³³³⁴³⁵. Because nearly all of the county's soils rate poorly for a conventional septic drain field, budget for a site evaluation and likely an engineered system before you close³.

Watch-outs

Monterey County's coastal ADU ordinance that would let a tiny home or manufactured home qualify as an accessory dwelling unit has not yet taken effect; it needs Coastal Commission certification and Board confirmation first, so verify current status with HCD Planning Services before you plan around it¹²⁷.
Permit fees, the full step-by-step permit review timeline, and Monterey County's short-term/vacation-rental rules could not be confirmed from the county's own fee and process pages this session; call the Permit Center at (831) 755-5025 to confirm current fees and timelines before you budget a project⁹.
A draft county ordinance would exempt one small agricultural building on a qualifying lot of record from a construction permit, but it has not been confirmed as adopted; ask Building Services whether it has taken effect before assuming an ag building needs no permit⁹.

Sources

Written September 24, 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.

How Monterey County scores

Seclusion64100% ev.

Self-Sufficiency42100% ev.

Admin Boringness41100% ev.

Durability29100% ev.

Property Autonomy56100% ev.

Carry Cost42100% ev.

Evidence strength: 100%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$855kTypical home

0.7%Property tax

$12,799Land / acre

21"Annual rain

34.4% of yrsSevere drought

10.7 / yr (+6.2)Mid-century 100°F days

104.6 daysMid-century dry spell

1.77" (+6.8%)Mid-century 1-day rain

1.1×Wildfire change factor

100%Forward climate coverage

$1,446Home insurance / yr

6.1% / yrInsurance growth

1.06%Nonrenewal rate

county median (2+ published ZIPs)Insurance basis

1,184,052People within 2 hr

34,782Radius comparison (15 mi)

131.2People / sq mi

25.8%Federal land

25.8%Land at 15% slope or less

2.6%Septic soil without severe limits

44,384 acWorkable land screen

45%Wooded land

43.9 tonsBiomass / forest ac

59°FAvg temp

Answers from the rulebook for Monterey County

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

Monterey County rules

Owner-builder exemptionAvailable (with conditions)
Owner-builders obtaining a Monterey County construction permit for residential or other construction work within County Building Services jurisdiction.
- The County recognizes owner-builder permits and provides an owner-builder notice before permit issuance.
- Owner-as-Worker means the owner personally performs the construction work; the permit is taken out in the owner's name; and the owner is responsible for construction management, knowledge, workmanship, and completion.
- Owner-as-Contractor means the owner acts as general contractor and hires California-licensed subcontractors; hiring unlicensed contractors creates significant financial risk.
- Owner-as-Employer involves paying an unlicensed individual to perform construction work valued at more than $500; the owner becomes responsible for employment requirements, supervision, performance, safety, and welfare.
- The page states that Assembly Bill 2335 amended California Health and Safety Code section 19825 and that the enhanced owner-builder application requirements were effective January 1, 2009.
unlicensed individual construction-work value threshold: > 500 USD (Owner-as-Employer category described by the County.)
“Owner-as-Worker is a type of Owner-Builder where you personally perform the construction work, the permit is taken out in your name and you are personally responsible for the construction management, knowledge, workmanship, and completion of the job.”
Owner - Builder Notice & Information ↗Re-checked Sep 24, 2026
Building code adoptedAdopted (with conditions)
Monterey County adoption and enforcement of the 2022 California Building Code and related California building standards codes.
- The adopted codes include the California Building Code, Green Building Standards Code, Electrical, Mechanical, Plumbing, Fire, Energy, Historical, and Uniform Housing Codes.
- Project-specific requirements may include applicable Monterey County Code provisions and local amendments.
code cycle: 2022
“The County adopted the 2022 California Building Code; Green Building Standards Code; and Electrical, Mechanical, Plumbing, Fire, Energy, Historical, and Uniform Housing Codes.”
2023–2031 Housing Element, Chapter 3: Housing Constraints ↗Re-checked Sep 24, 2026
County-wide zoningPresent (with conditions)
Zoning regulation administered by Monterey County for unincorporated inland and coastal areas.
- Title 21 applies to inland areas and Title 20 applies to coastal areas.
- Specific uses may be allowed by right or require a Use Permit or Coastal Administrative Permit depending on the zoning district and use.
- Incorporated municipalities are outside this county-unincorporated zoning scope.
“The Monterey County Code Titles 20 (coastal unincorporated) and 21 (inland unincorporated) set forth zoning and development standards with the purpose of safeguarding and enhancing the well-being, safety, and overall welfare of residents.”
2023–2031 Housing Element, Chapter 3: Housing Constraints ↗Re-checked Sep 24, 2026
Minimum lot sizeDistrict specific (with conditions)
Residential and resource/agricultural zoning districts in unincorporated Monterey County, with separate inland Title 21 and coastal Title 20 standards.
- Title 20 applies to coastal unincorporated areas and Title 21 applies to inland unincorporated areas.
- Community Plan and Specific Plan areas may have additional or different development standards.
- The table is a summary of standards from the 2022 Monterey County Zoning Ordinance.
minimum lot area by district: Inland: RDR 5 acres; LDR 1 acre; MDR 6,000 square feet; HDR 5,000 square feet; MU N/A; AI greater than 1 acre; RC 10 acres; F 40–160 acres; RG 10–160 acres; PG 40 acres. Coastal: RDR 5 acres; LDR 1 acre; DMF LDR variants 1 acre; MDR variants 6,000 square feet; HDR 5,000 square feet; RC 10 acres; WSC 1 acre; CAP 40 acres; AC 40 acres. (Inland AI lots greater than 1 acre require a general development plan; agricultural-district values are shown as ranges where applicable.)
“Lot Area (min.) 5 ac 1 ac 6000 sf 5000 sf N/A >1 ac 10 ac 40-160 ac 10-160 ac 40 ac”
2023–2031 Housing Element, Chapter 3: Housing Constraints ↗Re-checked Sep 24, 2026
SetbacksDistrict specific (with conditions)
Structures in unincorporated Monterey County zoning districts.
- Setbacks differ by zoning district and by inland versus coastal area.
- Accessory structures have separate standards in some districts.
- B combining districts may replace the underlying building-site-area and setback standards, subject to minimums and height/setback exception chapters.
- Community Plan and Specific Plan standards may also apply.
inland minimum setbacks: RDR front 30 ft, side 20 ft, rear 20 ft; LDR front 30 ft, side 10% of average lot width, rear 20 ft; MDR front 20 ft, side 5 ft, rear 10 ft; HDR front 20 ft, side 5 ft, rear 10 ft; RC front 30 ft, side 20 ft, rear 20 ft; F/RG/PG generally front 30 ft, side 20 ft, rear 20 ft, subject to district notes. (Side setback in LDR is 10% of average lot width, to a maximum of 20 feet; rear setback note may vary in a B district.) · coastal minimum setbacks: Coastal Table 3-13 provides district-specific front, side, and rear setbacks, including RDR main structure front 50 ft, side 20 ft, rear 20 ft and accessory-structure standards. (Accessory and non-habitable structures have separate setback rules.)
“Front 30 ft 30 ft 20 ft 20 ft 30 ft 30 ft 30 ft 30 ft Side 20 ft 10% avg. 5 ft 5 ft 20 ft 20 ft 20 ft 20 ft Rear 20 ft 20 ft 10 ft 10 ft 20 ft 20 ft 20 ft 20 ft”
2023–2031 Housing Element, Chapter 3: Housing Constraints ↗Re-checked Sep 24, 2026
Lot coverageDistrict specific (with conditions)
Residential, mixed-use, agricultural, conservation, and related zoning districts in unincorporated Monterey County.
- Lot coverage varies by zoning district and by inland versus coastal area.
- For the inland table, the stated variable coverage note is 35% maximum for lots under 20,000 square feet and 25% maximum for lots of 20,000 square feet or more.
- Other zoning, overlay, Community Plan, or Specific Plan standards may apply.
inland lot coverage maximums: RDR 25%; LDR varies; MDR 35%; HDR 60%; MU 60%; AI 50%; RC 25%; F 5%; RG 5%; PG 5%. percent (LDR: less than 20,000-square-foot lot, 35% maximum; 20,000-square-foot or larger lot, 25% maximum.) · coastal lot coverage maximums: RDR 25%; LDR varies; DMF LDR 15%; MDR 35%; DMF/Carmel MDR variants 25%, 35%, and 35%; HDR 60%; RC 25%; WSC 10%; CAP 3%; AC 3%. percent (Table notes and district-specific standards apply.)
“Lot Coverage (max.) 25% Varies 35% 60% 60% 50% 25% 5% 5% 5%”
2023–2031 Housing Element, Chapter 3: Housing Constraints ↗Re-checked Sep 24, 2026
Building heightDistrict specific (with conditions)
Buildings and structures in unincorporated Monterey County zoning districts.
- Height varies by zoning district and by inland versus coastal area.
- The table notes exceptions where another zoning district or special standard applies.
- Height and setback exception chapters may apply, including Chapters 21.62 and 20.62.
inland maximum height: RDR 30 ft; LDR 30 ft; MDR 20–30 ft; HDR 35 ft; MU 35 ft; AI 35 ft; RC 30 ft; F/RG/PG 35 ft. feet (MDR note: 30 feet, 20 feet in Del Monte Forest; other district notes may apply.) · coastal maximum height: RDR 30 ft; LDR 30 ft; DMF LDR 30 ft; MDR 30 ft; DMF/Carmel MDR variants 20 ft, 30 ft, and 20 ft; HDR 35 ft; RC 30 ft; WSC 24 ft; CAP 35 ft; AC 35 ft. feet (Some values apply unless another zoning designation controls.)
“Height (max.) 30 ft 30 ft 20-30 ft 35 ft 35 ft 35 ft 30 ft 35 ft 35 ft 35 ft”
2023–2031 Housing Element, Chapter 3: Housing Constraints ↗Re-checked Sep 24, 2026
Living in an RVProhibited
Occupying, using, renting, or living in a trailer, camper, RV, or boat as a dwelling or temporary guest room while parked or stored on private property in unincorporated Monterey County.
- The cited county page states that the prohibition applies even for a short time.
- The page also discusses vehicle abatement and citation consequences.
- This claim does not address lawful camping at county-operated campgrounds or incorporated municipalities.
“Also, it is illegal to occupy, use, rent or live in any trailer, camper, RV or boat as a dwelling or temporary "guest room" while parked or stored on private property - even for a short time.”
Problem Vehicle Report ↗Re-checked Sep 24, 2026
Tiny homesAllowed (with conditions)
A tiny home used as an accessory dwelling unit in applicable unincorporated Monterey County coastal zoning districts.
- The tiny home must meet the requirements of California Health and Safety Code section 18007.
- The unit must satisfy the County's ADU definition and development standards.
- The coastal ADU ordinance applies in zoning districts allowing single-family or multiple-family dwellings, including HDR(CZ), MDR(CZ), LDR(CZ), RDR(CZ), WSC(CZ), CGC(CZ), MLC(CZ), VSC(CZ), CAP(CZ), and AC(CZ).
- County Environmental Health Bureau review and approval is required where the unit connects to private sewage disposal or specified private or small water systems; if adequate sewage disposal or water supply is unavailable, the ADU is prohibited.
- The ordinance states it will not go into effect until Coastal Commission certification and confirmation of the Board's action.
California Health and Safety Code definition: 18007 (The tiny home must meet the statutory requirements.)
“An Accessory Dwelling Unit also includes the following: (1) an efficient unit, as defined in Section 17958.1 of the California Health and Safety Code, as may be amended; (2) a manufactured home, as defined in Section 18007 of the Health and Safety Code, as may be amended; and (3) a tiny home, if the tiny home meets the requirements of Section 18007 of the Health and Safety Code, as may be amended.”
Ordinance, coastal ADU/JADU ↗Re-checked Sep 24, 2026
Manufactured homesAllowed (with conditions)
A manufactured home used as an accessory dwelling unit in applicable unincorporated Monterey County coastal zoning districts.
- The manufactured home must meet the definition in California Health and Safety Code section 18007.
- The unit must satisfy the County's ADU definition and development standards.
- The coastal ADU ordinance applies in listed coastal zoning districts that allow single-family or multiple-family dwellings.
- Environmental Health Bureau approval is required for specified private sewage and water systems, and the ADU is prohibited if adequate sewage disposal or water supply is unavailable.
- The ordinance states it will not go into effect until Coastal Commission certification and confirmation of the Board's action.
California Health and Safety Code definition: 18007 (The manufactured home must meet the statutory requirements.)
“An Accessory Dwelling Unit also includes the following: (1) an efficient unit, as defined in Section 17958.1 of the California Health and Safety Code, as may be amended; (2) a manufactured home, as defined in Section 18007 of the Health and Safety Code, as may be amended; and (3) a tiny home, if the tiny home meets the requirements of Section 18007 of the Health and Safety Code, as may be amended.”
Ordinance, coastal ADU/JADU ↗Re-checked Sep 24, 2026
Who permits septicCounty
Onsite wastewater treatment systems in unincorporated Monterey County.
- The County LAMP and Chapter 15.20 may apply to a city or other jurisdiction by written agreement approved by the County and that jurisdiction.
- The Monterey County LAMP was adopted April 3, 2018; approved by the Central Coast Regional Water Quality Control Board May 10-11, 2018; and became effective May 11, 2018.
“In accordance with Tier 2 of the OWTS Policy, on April 3, 2018, the County of Monterey adopted the County's Local Agency Management Program for Onsite Wastewater Treatment Systems ("LAMP"). On May 10-11, 2018, the Central Coast Regional Water Quality Control Board approved the County's LAMP. [...] This Chapter applies in the unincorporated area of Monterey County.”
Adopted Monterey County Code Chapter 15.20, Sewage Disposal ↗Re-checked Sep 24, 2026
Septic permitRequired
Construction, replacement, modification, or abandonment of onsite wastewater treatment systems in unincorporated Monterey County.
- An OWTS installation permit from the County is required for domestic wastewater discharge of 10,000 gallons per day or less.
- For domestic wastewater discharge greater than 10,000 gallons per day, a County installation permit is required when the Central Coast Regional Water Quality Control Board has delegated permit authority to the County.
- The County may additionally require a Regional Water Quality Control Board discharge permit for systems of 10,000 gallons per day or less that have not been tested to meet NSF/ANSI standards.
- Constructing, replacing, modifying, or abandoning an OWTS without all required permits is unlawful.
- The chapter may apply within a city or other jurisdiction only by written agreement approved by the County and that jurisdiction.
domestic wastewater discharge threshold: <= 10000 gallons per day (County installation permit required under Chapter 15.20.020(B)(1)) · domestic wastewater discharge threshold: > 10000 gallons per day (County permit requires written delegation from the Central Coast Regional Water Quality Control Board under Chapter 15.20.020(B)(2))
“An OWTS installation permit from the County is required when the total discharge is ten thousand (10,000) gallons per day or less of domestic wastewater. [...] An OWTS installation permit from the County is required when the total discharge of domestic wastewater is greater than ten thousand (10,000) gallons per day or any volume of non-domestic wastewater when the Central Coast Regional Water Quality Control Board (RWQCB) has delegated, in writing, permit authority for the OWTS to the County.”
Adopted Monterey County Code Chapter 15.20, Sewage Disposal ↗Re-checked Sep 24, 2026
Septic inspectionLimited
Routine monitoring, maintenance, and evaluation of OWTS in unincorporated Monterey County when the County determines those activities are necessary to ensure acceptable operation and design performance.
- A County operating permit is required when the County determines routine monitoring or maintenance is necessary.
- The available ordinance text does not establish a universal periodic inspection requirement for every conventional OWTS.
- Additional inspection or evaluation requirements may arise through an operating permit or other Chapter 15.20 requirements.
“An OWTS operating permit from the County is required when the County has determined that routine monitoring or maintenance is necessary to ensure the system is operating in an acceptable manner and as designed.”
Adopted Monterey County Code Chapter 15.20, Sewage Disposal ↗Re-checked Sep 24, 2026
Off-grid sanitationLimited
Off-grid or onsite sanitation using OWTS or onsite treated nonpotable water systems in unincorporated Monterey County.
- OWTS construction, replacement, modification, and abandonment require all applicable permits.
- OTNWS systems require a County plumbing permit before installation unless the system meets the California Plumbing Code clothes-washer-system definition.
- The chapter applies to the unincorporated area and may apply to cities or other jurisdictions only by written agreement.
- Other sanitation, public-health, water-quality, and utility requirements may apply.
OWTS domestic wastewater discharge: <= 10000 gallons per day (County installation permit required) · OTNWS plumbing permit: true (Not required if the system meets the California Plumbing Code clothes washer system definition)
“A plumbing permit shall be obtained from the County prior to installation of the system unless said system meets the definition of a clothes washer system, as defined by Chapter 15 of the California Plumbing Code, as may be amended from time to time.”
Adopted Monterey County Code Chapter 15.20, Sewage Disposal ↗Re-checked Sep 24, 2026
Subdividing landRegulated (with conditions)
Subdivision applications and related development review within Monterey County jurisdiction, including unincorporated areas.
- All subdivision applications are reviewed for adequate water supply and wastewater disposal feasibility.
- General Plan, zoning, subdivision, environmental, and site-specific requirements may also apply.
- Incorporated municipalities may administer their own local approvals.
“All subdivision applications and single family dwelling proposals are reviewed to ensure adequate water supply and wastewater disposal feasibility.”
Land Use (formerly EHRS) ↗Re-checked Sep 24, 2026

California rules that apply here

Building permitRequired
Construction projects within the California Department of Health Care Access and Information Office of Statewide Hospital Planning and Development jurisdiction, including health-facility projects requiring HCAI review.
- Written plan approval must be issued before the building-permit application proceeds.
- The application must provide contractor information, Inspector of Record information, and a Testing Inspection and Observation program.
- The TIO program must be field-approved before approval and subsequent issuance of the building permit.
- This claim does not establish the permit rule for projects outside HCAI jurisdiction.
“Once a project receives written plan approval, a Building Permit application is submitted through the e-Services Portal.”
Building Permits & Construction Observation ↗Re-checked Sep 26, 2026
InspectionsRequired
Construction projects within HCAI jurisdiction involving California health facilities.
- HCAI field personnel make periodic site visits.
- The Inspector of Record is responsible for continuous inspection of the work.
- The inspections address seismic, fire, life-safety, and other building-code requirements.
“The approved IOR with the required personal knowledge performs only those duties associated with the required continuous inspections”
HCAI Standard Project Process ↗Re-checked Sep 26, 2026
One more reviewed finding on this topic
- Required — California owner-builder projects addressed by the Contractors State License Board guidance.
  “Your project must pass codes and building inspections.”
  Owner-Builder Responsibilities ↗Re-checked Sep 26, 2026
Certificate of occupancyRequired
Completed construction projects within HCAI jurisdiction involving California health facilities.
- The HCAI Compliance Officer issues the project-completion Substantial Compliance or Certificate of Occupancy once required conditions are met.
- The stated examples include delivery of all test reports to the Inspector of Record, clearance of outstanding items, and completion of the Testing, Inspection and Observation Program.
- Once construction is completed, the certificate of occupancy allows the owner to apply to the Department of Health Services for a license to operate the health facility.
“Issues the certificate of occupancy and/or construction final.”
HCAI Standard Project Process ↗Re-checked Sep 26, 2026
Zoning districtsPartial
California city and county zoning codes and the zoning districts established by those local jurisdictions.
- The city or county zoning code implements general-plan policies at the individual-parcel level.
- Local zoning codes identify allowed land uses in the jurisdiction’s zoning districts.
- Since 1971, state law requires city or county zoning codes to be consistent with the jurisdiction’s general plan, except in charter cities.
- The source does not publish a statewide list of parcel-specific zoning districts; the applicable local jurisdiction must be consulted.
“The zoning code presents standards for different land uses and identifies which land uses [...] are allowed in the various zoning districts of the jurisdiction.”
Chrome Plating Amendments Environmental and Regulatory Setting ↗Re-checked Sep 26, 2026
Minimum dwelling sizeSpecified
Efficiency units permitted by a California city, county, or city and county.
- The local jurisdiction must adopt an ordinance permitting the efficiency unit.
- Occupancy is limited to no more than two persons.
- The unit may have partial kitchen or bathroom facilities as specified by the local ordinance.
- All other applicable minimum standards under Health and Safety Code Part 1.5 continue to apply.
minimum floor area: >= 150 square feet · maximum occupancy: <= 2 persons
“Notwithstanding Sections 17922, 17958, and 17958.5, a city, county, or city and county may, by ordinance, permit efficiency units for occupancy by no more than two persons which have a minimum floor area of 150 square feet and which may also have partial kitchen or bathroom facilities, as specified by the ordinance.”
California Health and Safety Code Section 17958.1 ↗Re-checked Sep 9, 2026
Camping on your landLimited
Camping in units operated by the California Department of Parks and Recreation statewide.
- Camping is confined to areas designated for that purpose.
- Occupancy by the same persons, equipment, or vehicles is generally limited to 30 days in any calendar year in that unit.
- The Department may establish shorter or longer occupancy limits.
- When a shorter seasonal limit applies, the camper must vacate the campsite and may not reregister in the unit until 48 hours have expired, measured from 12:00 noon on the checkout day to 12:00 noon on the second day following.
- A district superintendent may permit one-night camping in a day-use area or portion of one, subject to Department-established fees and vehicle limitations; occupants must vacate by 9:00 a.m. the following morning.
- California State Parks' current reservation policy states that each campground has a consecutive-night limit, requires a 48-hour absence after that limit, and generally has a 30-night annual maximum, subject to individual park policies.
general annual occupancy limit: 30 days per calendar year per unit (The Department may establish shorter or longer limits of occupancy.) · return interval after shorter seasonal limit: 48 hours (Measured from 12:00 noon of the checkout day to 12:00 noon of the second day following.) · one-night camping in day-use area: 1 night (Only if permitted by the district superintendent; occupants must vacate by 9:00 a.m. the following morning.)
“Occupancy by the same persons, equipment, or vehicles of any camping facility is limited to a total of 30 days in any calendar year in that unit.”
California Off-Highway Motor Vehicle Laws 2014 ↗Re-checked Sep 26, 2026
One more reviewed finding on this topic
- Allowed (with conditions) — Temporary camping in California special occupancy parks, including parks containing recreational vehicles, tents, or camping cabins.
  ““Special occupancy park” means a recreational vehicle park, temporary recreational vehicle park, incidental camping area, or tent camp.”
  What is a Mobilehome Park or Special Occupancy Park? ↗Re-checked Sep 26, 2026
Accessory dwellingsAllowed (with conditions)
ADUs and junior ADUs subject to California State ADU Law.
- Approval is ministerial and without discretionary review or a hearing.
- Development standards must be objective and knowable in advance.
- The local permitting agency must determine application completeness and provide written notice within 15 business days.
- If an application is incomplete, the agency must identify missing items and explain how to complete it.
- Local site, building, health, safety, fire, utility, and other applicable requirements continue to apply.
written completeness determination: <= 15 business days (Measured from the permitting agency's receipt of the application.) · final written determination after appeal: <= 60 business days (Applies after receipt of the written appeal.)
“A permit application for an accessory dwelling unit shall be considered and approved ministerially without discretionary review or a hearing [...] A permitting agency shall determine whether an application to create or serve an accessory dwelling unit is complete and provide written notice of this determination to the applicant not later than 15 business days after the permitting agency received the application.”
Accessory Dwelling Unit Handbook March 2026 ↗Re-checked Sep 9, 2026
Well permitRequired
Construction, modification, or destruction of water wells in California.
- The permit is obtained from the applicable local environmental health agency or local water district before construction, modification, or destruction.
- Local enforcing agencies may adopt ordinances that meet or exceed DWR Well Standards.
- If no local well ordinance is adopted, the local enforcing agency must enforce the Statewide Model Well Ordinance.
- Water wells supplying public water systems have additional State Water Resources Control Board Division of Drinking Water certification requirements.
- Water-well construction must be performed by a licensed C-57 Well Drilling Contractor.
“Well owners need to obtain permits from local environmental health agencies or local water districts before construction, modification, or destruction takes place.”
Well Standards ↗Re-checked Sep 26, 2026
One more reviewed finding on this topic
- Limited — Construction, alteration, maintenance, or destruction of water wells, monitoring wells, cathodic protection wells, and geothermal heat exchange wells in California.
  “Permitting and enforcement are carried out by the LEAs, such as the County Department of Environmental Health.”
  Well Standards ↗Re-checked Sep 9, 2026
Mandatory utility hookupSewer (with conditions)
Certain existing OWTS in California Tier 3 impaired-water-body areas that commit to connect to a centralized wastewater collection and treatment system regulated through waste discharge requirements.
- The OWTS must have been constructed and operating, or permitted, on or before the date the nearby water body was added to OWTS Policy Attachment 2.
- The owner must commit by legally binding document to connect to a centralized wastewater collection and treatment system regulated through waste discharge requirements.
- The owner must sign the legally binding document within 48 months after the nearby water body's initial listing on Attachment 2.
- The specified connection date may not extend beyond nine years after the date the nearby water body is added to Attachment 2.
- The rule is an exception to Section 10 requirements for qualifying existing or permitted systems; it is not a general statewide requirement that every property connect to public sewer.
deadline to sign connection commitment: 48 months (Measured from the date the nearby water body is initially listed on Attachment 2.) · maximum time to complete connection: <= 9 years (Measured from the date the nearby water body is added to Attachment 2.)
“The owner must sign the document within forty-eight months of the date that the nearby water body is initially listed on Attachment 2. The specified date for the connection to the centralized community wastewater collection and treatment system shall not extend beyond nine years following the date that the nearby water body is added to Attachment 2.”
2023 OWTS Policy ↗Re-checked Sep 26, 2026
Driveway accessRequired
Driveways and driveway connections involving proposed encroachments within, under, or over State highway rights of way.
- The requirement applies to proposed activities related to placement of encroachments within, under, or over State highway rights of way.
- Applications are submitted to the appropriate District Encroachment Permits Office having jurisdictional authority over the site.
- Local or other agency requirements may also apply outside State highway rights of way.
“An encroachment permit must be obtained for all proposed activities related to the placement of encroachments within, under, or over the State highway rights of way.”
Encroachment Permits | Caltrans ↗Re-checked Sep 26, 2026
Permit processPublished (with conditions)
Construction, alteration, repair, movement, improvement, removal, conversion, or demolition of a building or structure in California.
- A separate permit for each building or structure must be obtained from the building official before the work.
- Code requirements vary by city and county; the applicable local building department must be consulted.
“no building or structure may be erected, constructed, enlarged, altered, repaired, moved, improved, removed, converted or demolished unless a separate permit [...] has first been obtained”
Do I need a building permit for my project? ↗Re-checked Sep 9, 2026
Campground & park staysLimited
Occupancy and use of manufactured homes and mobilehomes in California mobilehome parks and other locations subject to HCD jurisdiction.
- HCD administers titling and registration for manufactured homes and mobilehomes.
- HCD-inspected mobilehome parks are subject to health and safety enforcement where local government has not assumed enforcement.
- Manufactured/mobilehome park regulations address construction, use, maintenance, and occupancy.
- Separate local land-use, building, fire, health, and utility requirements may apply.
“MHs may be occupied outside or inside of mobilehome parks and installation and approval for occupancy is governed by the Mobilehome Parks Act (MPA), HSC Sections 18200, et seq., and Title 25, CCR Sections 1000, et seq.”
Manufactured & Mobilehomes ↗Re-checked Sep 26, 2026
2 more reviewed findings on this topic
- Limited — RV and trailer camping at Silver Strand State Beach Campground in the San Diego Coast District.
  “Camping Stay Limits: Applies to persons, equipment, or vehicles and any combination thereof [...] Maximum stay of 30 days per calendar year [...] Maximum 7 consecutive days during peak season (May 15 – September 15) [...] Maximum 14 consecutive days during non-peak season”
  Silver Strand State Beach Campground Rules and Regulations ↗Re-checked Sep 9, 2026
- Limited — Occupancy and use of recreational vehicles in California special occupancy parks and designated RV sections of mobilehome parks.
  “Unless otherwise allowed by a local ordinance, RVs generally may be occupied only in mobilehome parks or special occupancy parks governed by the Mobilehome Parks Act”
  What is a Mobilehome Park or Special Occupancy Park? ↗Re-checked Sep 26, 2026
county zoning authorityGeneral
California county legislative bodies' authority to adopt zoning ordinances regulating buildings, structures, land uses, lots, yards, open space, lot coverage, intensity of use, parking, loading, and setbacks within county jurisdiction, including unincorporated areas.
- The authority is exercised pursuant to Government Code Chapter 4, Zoning Regulations.
- The statute separately authorizes city legislative bodies; incorporated municipalities may exercise their own zoning authority.
- Government Code Section 65850 also lists authority to regulate signs and billboards, building and structure location, height, bulk, number of stories, and size, lot and open-space size and use, lot coverage, intensity of land use, offstreet parking and loading, and building setback lines.
- The cited section states it was amended by Stats. 2017, Ch. 376, Sec. 1, effective January 1, 2018.
“The legislative body of any county or city may, pursuant to this chapter, adopt ordinances that do any of the following:”
California Government Code Section 65850 ↗Re-checked Sep 21, 2026
county building authorityGeneral
California counties administering and enforcing state building standards through county building departments, including residential construction in unincorporated areas.
- Each county must maintain building standards and state building regulations in the office of the building official responsible for administration and enforcement of state building standards.
- The statewide Title 24 standards apply subject to statutory exceptions and any authorized local amendments or local requirements.
- The cited HCD bulletin concerns the 2019 California Building Standards Code and its July 1, 2021 supplement; later code editions may supersede those particular edition dates.
“These codes shall be maintained in the office of the building official responsible for the administration and enforcement of state building standards”
Information Bulletin 2021-02: 2019 California Building Standards Code Supplement ↗Re-checked Sep 26, 2026

Still unanswered

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

Agricultural exemption — Current agricultural building or agricultural-use exemptions from Monterey County permitting or zoning requirements.
Building in a floodplain — Development in floodplain areas of unincorporated Monterey County.
Short-term rentals — Short-term or vacation rentals in unincorporated Monterey County, including coastal and inland areas.
Permit fees — Permit fees administered by Monterey County for building and related development permits.

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 Monterey County

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

Adjudicated — rights fixed

Water rights here have been fixed by a court. New supply effectively means acquiring an existing right.

Household wellPermit required — restricted

California requires no STATE permit for a domestic well — wells are permitted by the county — but under SGMA a Groundwater Sustainability Agency can meter or restrict new wells in medium/high-priority and critically overdrafted basins, and Executive Order N-7-22 requires counties in those basins to get GSA verification that a new well is consistent with the Groundwater Sustainability Plan before permitting.

Limit: 2 acre-feet/year de minimis under SGMA (Water Code §10721(e)) — largely exempt from GSA metering/fees

California DWR / State Water Board — SGMA de minimis & EO N-7-22 Action 9 FAQ ↗

Seaside Basin — Adjudicatedlocalized of county
Adjudicated 2006 (Monterey Peninsula) with a ramp-down of pumping under a watermaster; new appropriation effectively closed.
California DWR — Adjudicated Areas (Bulletin 118) ↗
Pajaro Valley Basin — Critically Overdraftedpartial of county
Managed via an approved GSP-Alternative with basin-wide extraction fees; new wells subject to county permit + EO N-7-22/GSA review.
California DWR Bulletin 118 — Critically Overdrafted Basins ↗
Salinas Valley — 180/400 Foot Aquifer Subbasin — Critically Overdraftedpartial of county
Adopted GSP with pumping reductions (seawater intrusion); new production wells subject to GSA consistency review and EO N-7-22.
California DWR Bulletin 118 — Critically Overdrafted Basins ↗

Hybrid state (appropriation + riparian). Groundwater rules change and basin boundaries follow the aquifer, not the county line — confirm current well and appropriation rules with the California state water agency before you buy or drill.Groundwater governance as of Jul 2026, cited to each administering agency.

Living off-grid in Monterey County, California

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

Monterey County scores 49/100 on the Bolthole Index, a solid county profile. Its strengths: about 34,782 people within 15 miles. Watch-outs: elevated mid-century heat, water, rain, or wildfire exposure and more administrative friction around building and land use.

Do you need a building permit in Monterey County, California?

Monterey County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Monterey County Health Department – Environmental Health Bureau. 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 Monterey County?

Living in an RV on your own land in Monterey County is prohibited: Occupying, using, renting, or living in a trailer, camper, RV, or boat as a dwelling or temporary guest room while parked or stored on private property in unincorporated Monterey County. The cited county page states that the prohibition applies even for a short time. The page also discusses vehicle abatement and citation consequences. A tiny home is allowed. Confirm with the county before relying on it.

How much does land cost in Monterey County, California?

Land in Monterey County runs about $12,799 per acre, based on the latest county data.

What is the water situation in Monterey County?

Monterey County gets about 21" of rain a year, with severe drought in roughly 34.4% of years. On water rights, Monterey County lies in the Seaside Basin — Adjudicated — Adjudicated 2006 (Monterey Peninsula) with a ramp-down of pumping under a watermaster; new appropriation effectively closed..

How remote is Monterey County?

A typical private-land location has about 34,782 people within 15 miles and 5,375,870 within 100 miles. These radius catchments are the published fallback where road routing is unavailable.

Building permits, zoning and septic rules in Monterey County, California

At a glance

Who to call

Do you need a building permit in Monterey County, California?

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

Does Monterey County have zoning?

How do septic permits work in Monterey County?

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

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

What to check before you buy land in Monterey County

Watch-outs

Sources

Monterey County in California

How Monterey County scores

Find land. Bring the promising ones back.

Parcel due diligence

Answers from the rulebook for Monterey County

Monterey County rules

California rules that apply here

Still unanswered

Water rights & wells in Monterey County

Living off-grid in Monterey County, California

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

Do you need a building permit in Monterey County, California?

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

How much does land cost in Monterey County, California?

What is the water situation in Monterey County?

How remote is Monterey County?

How Monterey compares in California