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

Yes. Unincorporated Coconino County requires a building permit for residential construction, and the applicant must receive approvals from Planning and Zoning, Environmental Quality, Engineering and the Building Division before the permit is issued¹. A short list of small structures does not need a building permit: one-story detached sheds and playhouses no larger than 200 square feet with no more than an 8-foot wall height and 15-foot overall height, fences no more than 7 feet tall, retaining walls no more than 4 feet high, grade-supported water tanks up to 5,000 gallons with height-to-diameter or width ratios no greater than 2 to 1, and sidewalks and driveways⁴. Arizona separately exempts a hoophouse or polyhouse used only to grow and store live plants from the county building-permit requirement, provided it isn't anchored permanently, stores no chemicals, and meets width and covering limits⁸. Once a permit is issued, inspections are a condition of it, and the Environmental Quality Division must sign off on any septic system before a Certificate of Occupancy is issued^9,10.

Building, zoning, environmental quality and engineering permits in Coconino County all run through Community Development, and the fastest way to reach any of them is the department's main line, (928) 679-8850⁴. You are allowed to build your own home yourself: submit an application and a set of construction documents to the Building Division for review, and once the plans are approved and fees are paid you can start construction and call for routine inspections⁴. Inside Flagstaff, Page, Williams, Town of Tusayan, municipal offices issue building permits^11,12,13,14. Conventional septic authority stays with Coconino County Environmental Quality, while ADEQ regulates larger systems³.

Coconino County administers zoning in unincorporated territory under its adopted Zoning Ordinance². In the General zone, the minimum parcel is 10 acres, the front setback is 30 feet and maximum height is 40 feet; Agricultural-Residential and Rural-Residential generally require at least 1 acre, a 25-foot front setback and a 35-foot maximum height, though the zoning map may require larger lots². Side-interior setbacks are 20 feet in General and 10 feet in Agricultural-Residential and Rural-Residential, and rear setbacks are 30 feet in General and 20 feet in the other two². Maximum lot coverage is 30% in General and 35% in Agricultural-Residential and Rural-Residential². Residential Single-Family districts have minimum parcels from 6,000 to 36,000 square feet, district-specific setbacks, maximum coverage of 35% or 40%, and a 35-foot height limit². Setbacks account for access easements: a boundary easement is measured from its interior edge, and a bisecting easement is treated as a street². Coconino County regulates subdivisions and accepts subdivision applications through its online portal¹⁵. Inside Flagstaff, Page, Williams, Town of Fredonia, municipal offices set zoning^16,17,18,19. Conventional septic authority stays with Coconino County Environmental Quality, while ADEQ regulates larger systems³.

Septic systems are permitted at the county level here. Arizona's Department of Environmental Quality holds statewide authority but delegates onsite wastewater permitting to counties, including Coconino County^20,21. Coconino County handles conventional systems and some alternative systems up to 3,000 gallons per day; larger systems in Flagstaff, Williams, Page, Kachina Village and Pinewood are regulated directly by ADEQ³. Environmental Quality reviews the application, authorizes construction, inspects the finished system and issues the discharge authorization needed for a Certificate of Occupancy^3,4. The septic permit generally must come before the building permit, while the completed system must be approved before occupancy⁴. Properties using community sewer may instead need proof that service is available in Pinewood or Kachina Village; other community sewer systems may not require that approval¹. Only about 11% of mapped soils avoid a 'very limited' rating for conventional drain fields, so budget for site evaluation and a possible engineered or alternative system²². On a sale, Arizona requires a certified inspection within six months before transfer and buyer notice within 15 calendar days after closing²³.

Coconino County requires the right zoning permit for RV occupancy rather than imposing one answer for every stay. Planning and Zoning lists an option for up to 120 consecutive days per calendar year, a renewable 180-day option tied to a building permit, and permanent placement and occupancy of one RV or travel trailer⁵. For the 120-day option, no residence may already be on the property⁴. Tent camping on private land is prohibited outside permitted campgrounds⁴. An RV is not an accessory dwelling unit, so it cannot be rented separately beside a primary home, and an owner cannot occupy the RV while renting the home⁴. A tiny home on a permanent foundation must meet the building code and be in a district where the county's use table permits it². Manufactured homes are permitted in General, Agricultural-Residential, Residential and Manufactured Home, and Manufactured Home Park districts, but not Rural-Residential or the listed single-family districts². Establishing a manufactured home in a park requires a building permit, and park development requires Board of Supervisors approval of plans and maps². We could not confirm the current minimum dwelling floor area; ask Planning and Zoning before designing a small home⁴.

1. Confirm that the parcel is in unincorporated Coconino County, then ask Planning and Zoning for its district, allowed use, minimum lot size and setbacks^2,4.
2. Submit the building application and PDF construction documents online; if a complete plan set is not received within 10 working days, the county cancels the application²⁴.
3. Apply through Environmental Quality for septic approval, or document community-sewer availability where the county requires it^1,4.
4. If the site is in a mapped floodplain, obtain a Floodplain Development Permit before work starts²⁵.
5. Obtain a county Encroachment Permit for access to a county-maintained road or an ADOT permit for access to a state highway; the county does not require one for a private road⁴.
6. Build to the codes applicable on the submittal date and schedule each required inspection^9,26.
7. Obtain septic Authorization to Discharge, complete division approvals and pass final inspections before the Certificate of Occupancy¹⁰.

Coconino County average annual precipitation is 12.7 inches, and the county has spent about 30.3% of recent years in severe drought²². About 39.6% of the county is federal land, so confirm legal access with Planning and Zoning before making an offer^4,22. Check floodplain status with Community Development Engineering: construction inside a Regulatory Floodplain requires a Floodplain Development Permit^4,25. Typical home value runs about $633,105, with a median property tax bill of $2,008 a year at an effective rate around 0.5%, and typical homeowner's insurance costs about $1,198 a year²². Before you drill, know that a domestic well pumping 35 gallons a minute or less is generally exempt from Active Management Area groundwater rights, but you still must file a Notice of Intent to Drill with ADWR and use a licensed well-drilling contractor⁷. Confirm road access before you close: a driveway connecting to a county-maintained road needs a county Encroachment Permit, and one connecting to a state highway needs an ADOT Encroachment Permit instead^27,28. If you're weighing short-term rental income, Coconino County requires its own permit, an annual $250 renewal fee and a background check before it will issue one, and only in the unincorporated area²⁹.