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

Yes: construction in unincorporated Pinal County needs a building permit unless the work is specifically exempt¹. Pinal County enforces the 2018 International Building and Residential Codes and related 2018 codes, along with the 2017 National Electrical Code, in unincorporated areas and in cities that contract with the county for code services⁵. Listed exemptions include a detached accessory building up to 200 square feet with walls up to 10 feet high, a fence up to 7 feet, certain retaining walls up to 4 feet, and a qualifying water tank up to 5,000 gallons¹. A free-standing livestock, hay, ramada, gazebo or similar shade structure is exempt when it is no larger than 200 square feet and does not encroach into required setbacks¹². Exempt work may still need electrical, plumbing or mechanical permits and must comply with zoning and building-code limits¹. Inside Maricopa and Apache Junction, the city issues building permits^13,14. Septic permits remain with Pinal County Aquifer Protection, with wastewater-agency approval required inside incorporated areas³.

The Pinal County Building Safety Department provides plan review, inspections and code enforcement for unincorporated Pinal County and for cities that have an intergovernmental agreement with the county⁵. Call 520-509-3555 or visit 85 N Florence Street, First Floor, Florence, AZ 85132⁵. Submit the architectural site plan, owner authorization, construction documents and supporting materials as PDFs through the Citizen Access Portal; enter the parcel number without dashes¹⁵. When plan review is required, its fee is 65% of the building-permit fee and is due at submittal¹⁶. After approval and payment, the county emails the permit and approved drawings, and inspections require a valid permit number¹⁵. For a commercial project, the final inspection is not the Certificate of Occupancy; the Certificate of Occupancy must be requested separately¹⁷.

Pinal County zoning governs unincorporated land; verify the parcel's district through Citizen Access². Maricopa, Apache Junction and Florence have their own zoning^18,19,20. So do Eloy, Coolidge and Kearny^21,22,23. Queen Creek, mainly in Maricopa County, and Marana, mainly in Pima County, reach into Pinal County and set their own zoning^24,25. Septic permits stay with Pinal County Aquifer Protection, subject to wastewater-agency approval inside incorporated areas³. On unincorporated land, CR-1A requires at least one acre, CR-1 requires 20,000 square feet, and GR requires 54,450 square feet (1¼ acres)^26,27,28. CR-1A yards are 30 feet in front, 10 feet on each side and 40 feet in back; CR-1 requires 25 feet in front and back and 10 feet on each side; GR requires 40 feet in front and back and 20 feet on each side, subject to frontage and corner-lot exceptions^26,27,28. Arizona's zoning protection for general agriculture on at least 5 contiguous commercial acres does not waive building, septic, floodplain or health requirements¹¹.

Pinal County Aquifer Protection permits and inspects conventional and alternative septic systems throughout the county⁷. Off-grid sanitation where sewer is unavailable can use an approved onsite system, but site, design and subdivision requirements still apply; this is not blanket permission for every parcel⁹. New construction, repairs and alterations need a county septic permit; unincorporated parcels need zoning clearance first, while incorporated areas and wastewater districts need written approval from the responsible wastewater agency³. For the applicable general-permit process, submit a Notice of Intent to Construct and complete construction within 2 years after approval⁷. Construction, inspection and testing precede Discharge Authorization; do not cover or operate the system before final inspection and county approval to discharge^3,8. Only 19.7% of Pinal County soils rate without severe limits for conventional drain fields, so arrange a site evaluation before fixing the house location²⁹. On resale, the seller must arrange a qualified inspection within 6 months before transfer, and the buyer must file the transfer notice within 15 calendar days afterward³⁰. Before a licensed contractor drills a new groundwater well, file a Notice of Intent to Drill with Arizona's Department of Water Resources; Aquifer Protection reviews applications on parcels of 5 acres or smaller for state referral^7,31.

You cannot place a park model or RV on a vacant parcel in unincorporated Pinal County⁴. An owner-builder with a current valid building permit may seek a Temporary Use Permit to live in an RV on the property during construction; the permit costs $427 for 6 months⁴. The RV Homesite Zone is different: lots in an RV subdivision require at least 6,000 square feet and 60 feet of width, with yards of 15 feet in front and 10 feet on each side and in back³². Manufactured homes require Community Development permits, suitable zoning and compliance with applicable development standards⁴. Pinal County has no confirmed standalone occupancy rule for a structure merely called a tiny home, so ask Planning whether the proposed unit will be treated as a dwelling, manufactured home, park model or RV³³. The current ADU provision requires at least 200 square feet and compliance with zoning, building, fire and public-health rules; RVs, mobile homes, manufactured homes and park models are excluded except under the cited statutory exception³⁴.

1. Confirm whether the parcel is in unincorporated Pinal County or a municipality, then ask the correct planning office for its zoning district and development standards².
2. Confirm legal access; a new driveway onto a county road requires a Right-of-Way Use Permit before installation³⁵.
3. Check the flood map before fixing the building site because development in a floodplain requires a separate Floodplain Use Permit³⁶.
4. Arrange the site evaluation and septic design early because only 19.7% of county soils rate without severe limits for a conventional drain field²⁹.
5. Choose a licensed contractor or qualify as an owner-builder; the owner-builder exception removes the contractor-license requirement, not permits or code compliance¹⁰.
6. Submit the site plan, owner authorization and construction documents as PDFs through Citizen Access, with the parcel number entered without dashes¹⁵.
7. After issuance, call 520-866-6299 for required building inspections; Aquifer Protection separately inspects septic lines, the tank and disposal field^15,37.

Confirm jurisdiction first: Pinal County rules govern unincorporated land, while a city or town may have different zoning and permitting rules². Verify that the intended home type is allowed; an RV cannot go on a vacant parcel, and a manufactured home needs county permits, compatible zoning and a qualifying completion date⁴. Check legal access, the driveway permit path and floodplain status before choosing a house site^35,36. Water deserves equal attention: Pinal County averages 11.3 inches of precipitation and experiences severe drought in 33.9% of years²⁹. Confirm the parcel's water source and whether a utility, subdivision or development agreement requires a connection; no single countywide connection rule could be confirmed, so ask Aquifer Protection and the serving utility⁷. Budget for septic testing because only 19.7% of soils rate without severe limits for a conventional drain field²⁹. Finally, determine whether any claimed agricultural exemption actually applies; the zoning protection for general agriculture requires at least 5 contiguous commercial acres and does not waive separate health or development rules¹¹.