Building permits, zoning and land rules in La Paz County, Arizona

Unincorporated La Paz County requires building permits for construction and regulated building work, although limited exemptions apply¹. The county building code covers unincorporated areas excluding Indian Reservations and adopts the 2018 International Residential Code and 2020 National Electrical Code, among other codes⁹. A nursery or agricultural shade-cloth structure without service systems is exempt from the building permit, but must still comply with other applicable codes and ordinances¹⁰.

Zoning clearance and applicable permits must be obtained before regulated work or a change of use, and construction must remain accessible for required building inspections^2,11.

The La Paz County Building and Safety Department regulates development activity and land use in unincorporated La Paz County¹. Send building questions and submittals to comdev@lapaz.gov¹. Inside Quartzsite, the town’s Building Safety Department issues building permits for covered work³. Septic applications still go to La Paz County Community Development^4,5.

A county application must be complete, accurate and signed by the authorized owner or designated agent¹⁰. The application must describe the work, locate the property, state the intended use and occupancy, include required construction documents and valuation, and supply other information requested by the code official¹⁰. La Paz County publishes a current Community Development fee schedule, and the amount varies with the service, permit type, valuation, plan review and inspections¹².

La Paz County zoning clearance is required before regulated land use or structural activity in unincorporated areas². Parker and Quartzsite have their own zoning ordinances; septic applications remain with La Paz County Community Development^4,5,13,14.

In the Rural Agricultural districts, up to 2 single-family dwellings per lot—including site-built homes, manufactured homes and park models—are allowed with a building or placement permit and compliance with development and wastewater standards². Rural Agricultural setbacks are generally 20 feet front and 10 feet side and rear; buildings housing commercially raised poultry or animals require 50-foot side and rear setbacks, while no setback is required along a property line abutting the Colorado River².

La Paz County defines a guesthouse as a separate residential area with sleeping, cooking and bathroom facilities: friends or family may use it without compensation, an unattached unit cannot exceed 1,000 square feet, and a conditional use permit is required where the district does not allow the accessory use by right².

La Paz County Community Development processes conventional onsite-septic applications, construction authorizations, inspections, discharge authorizations and system transfers⁵. ADEQ delegates onsite-wastewater permit authority to Arizona counties, so submit the application to La Paz County for property located here⁴. An off-grid property without sewer service is not exempt: a conventional or alternative onsite system still needs county permitting, Approval to Construct, installation inspection and discharge authorization⁴.

A complete application includes a Notice of Intent to Discharge, a Uniform Site Investigation Report, and a scaled site plan showing required setbacks and relevant site data⁶. After installation, the system requires an inspection and written discharge-authorization materials⁶. Only 39.8% of county soils are rated without severe limitations for a conventional drain field, so soil evaluation can materially affect system design¹⁵. Call Community Development at (928) 669-6138 for the county septic process⁵.

La Paz County allows an RV as a principal dwelling in the Recreational Vehicle Subdivision district with a placement permit; a second RV dwelling requires a conditional use permit⁷. Rural Agricultural districts allow up to 2 occupied RVs per lot when licensed and operative, with placement permits and compliance with wastewater standards². The separate Rural Agricultural temporary-hookup allowance lasts no more than 180 days per calendar year and requires a lawful permanent dwelling, an installed wastewater system, or an approved building or placement permit².

For a tiny home classified as a park model, permanent residence in unincorporated La Paz County is allowed only where the zoning table permits it; the unit must remain licensed and operative, meet development and wastewater standards, and have a placement permit before placement or use². The county defines park models as having 320–400 square feet of gross trailer area when set up, while manufactured homes must have at least 320 square feet when erected; these definitions are not a universal minimum floor area for every home². Accessory structures cannot be used as dwellings in the Recreational Vehicle Subdivision or Manufactured Home Subdivision districts².

For a home in unincorporated La Paz County, use this order:

1. Ask Building and Safety to confirm the parcel's zoning district, allowed dwelling type and required zoning clearance².
2. If the property needs septic, submit the site investigation, site plan and wastewater application and wait for Approval to Construct⁶.
3. If a new well is planned, file the Notice of Intent to Drill with ADWR and obtain the county's separate well approval⁵.
4. Submit complete building plans and the signed county application, then obtain the building permit before starting work^1,10.
5. Obtain a Floodplain Use Permit for development in a mapped floodplain and an encroachment permit for a driveway or other work in county right-of-way^16,17.
6. Keep the site accessible for required building and septic inspections^6,11. In a Special Flood Hazard Area, the county will not issue a Certificate of Occupancy until the final building inspection is approved and compliant final-elevation certification is submitted¹⁸.

Start with jurisdiction and zoning: county rules govern unincorporated land, while incorporated municipalities may have their own rules¹⁹. Confirm legal and physical access, because a driveway or other work in a county right-of-way needs an encroachment permit before work begins¹⁷. A proposed division into 6 or more sale lots is regulated as a subdivision unless every lot exceeds 36 acres, and a subdivision permit is required²⁰. Check the flood map early; mapped-floodplain development needs a separate Floodplain Use Permit even when another activity is exempt from zoning or building codes¹⁶.

Water deserves equal attention in this dry county. Annual precipitation averages 5.7 inches, and severe drought has occurred in 22.8% of years¹⁵. A new, deepened or modified well requires an ADWR filing plus county well approval⁵. Countywide water and sewer connection requirements could not be confirmed, so identify the serving utility or proposed onsite source before closing. The effective property-tax rate is about 0.7%, and the median annual property-tax bill is $831¹⁵.