Building permits, zoning and rural land rules across Arizona

At a glance

Residential building permits

0 counties with none; 3 with limited requirements; 12 requiring building permits¹³²

County zoning

15 counties have zoning; 0 have neither county zoning nor residential building-permit requirements⁴⁹

Septic permits

Submit to the property’s county; ADEQ delegates administration locally⁶

RV living

11 counties have an answer: 2 temporary-only, 8 limited, 1 prohibited; 4 remain unconfirmed⁷

Tiny homes

9 counties have an answer: 1 allowed and 8 limited; 6 remain unconfirmed⁸

Owner-builder

Conditional contractor-license exemption for the owner’s own occupancy; local building permits still apply¹⁰

Domestic wells

ADWR requires a Notice of Intent to Drill before drilling, deepening or modifying a well¹¹

Property taxes

Median county effective rate: 0.5%; median county bill: $1,325 per year¹²

Who to call

Contact details are copied from each office’s official page and were checked against it on October 10, 2026.

Which Arizona counties don’t require a building permit?

Arizona has 0 counties classified as having no residential building-permit requirement, 12 requiring residential building permits and 3 with requirements limited to particular cases.¹²³ The limited-requirement counties are Apache County, Greenlee County and Santa Cruz County; that category does not establish a home-building exemption for any parcel.³

Arizona’s general statute requires a county building permit for building construction or additions costing more than $1,000 within county jurisdiction, with an exception for cities and towns with their own building-permit ordinances.¹³ County code adoption can include exemptions for rural or unclassified areas, so ask the county building office which adopted code and building-permit rules cover the proposed home.¹⁴ Arizona’s owner-builder exemption concerns contractor licensing for qualifying work intended solely for the owner’s occupancy, without an intention to sell or rent; it does not remove local building-permit requirements.¹⁰

Which Arizona counties have no zoning?

Arizona has 0 counties without county-wide zoning, and all 15 counties have county zoning.¹⁵⁴ Arizona also has 0 counties with neither county zoning nor residential building-permit requirements.⁹ County zoning jurisdiction is outside incorporated municipalities, so a county answer does not establish the rules inside city limits.⁵

For a rural Arizona parcel, ask the county planning and zoning office for the zoning designation and its permitted residential uses before choosing a building design.⁵ Arizona land-division review requires resulting lots to meet the acreage and dimensions of their applicable county zoning designation.¹⁶ Setbacks and maximum building coverage also depend on county zoning provisions rather than a universal statewide measurement.¹⁷¹⁸ Arizona’s agricultural zoning protection applies to qualifying general agricultural uses on at least 5 contiguous commercial acres, with statutory exclusions; the protection concerns agricultural use, not a blanket residential zoning exemption.¹⁹

Who issues septic permits in Arizona?

Arizona septic applications must be submitted to the county where the property is located; ADEQ retains permitting authority and delegates administration to the counties.⁶ Local administration is identified as a county office in 13 counties and a multi-county health district in 2 counties.²⁰ Named authorities include Apache County Public Health Environmental Division, Cochise County Health Department and Coconino County Community Development, so the septic counter is not always a health department.²⁰

Ask the property’s county septic authority for its application, site-evaluation requirements and current septic-permit fees before committing to a wastewater design.⁶ ADEQ Engineering Review can help with clarification of statutes, rules, delegation agreements and policies before a septic application is submitted.²¹ A residential building-permit exception does not transfer septic administration away from the county application route.³⁶

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

Arizona RV occupancy has county-level answers for 11 counties: 2 temporary-only, 8 limited and 1 prohibited, with 0 classified as allowed; the remaining 4 counties are unconfirmed.⁷ Navajo County and Graham County have temporary-only RV answers, subject to their county rules.⁷ Arizona’s long-term RV rental-space law concerns qualifying rented spaces in RV or mobile-home parks, rather than general permission to live in an RV on private land.²²

Tiny-home occupancy has answers for 9 counties: 1 allowed and 8 limited, while 6 remain unconfirmed.⁸ Cochise County allows tiny homes used as dwellings where the applicable zoning permits single-family dwellings.⁸ Use the Arizona tiny-home county guide to start a search, then ask the county building and zoning offices about the proposed unit and parcel; the limited answers include different conditions for site-built homes, homes on wheels and park models.⁸

Where are the best Arizona counties for a bolthole?

Apache County leads the listed Arizona Bolthole Index scores at 60, followed by Yavapai County at 55, Navajo County at 54, and Graham County and Greenlee County at 53.²³ Apache and Greenlee have limited residential building-permit requirements; Yavapai, Navajo and Graham require residential building permits, and all these counties have zoning and county septic administration.²³

The median county farmland value across Arizona is $2,148 per acre; Navajo County is listed at $325 and Apache County at $329 per acre.²⁴ These are farmland-value measures, rather than asking prices for individual rural building lots.²⁴ Arizona’s median county effective property-tax rate is 0.5%, and the median county tax bill is $1,325 annually.¹² A high score therefore belongs beside the county’s building-permit and zoning answers when comparing land, rather than serving as permission to build.²³

How do water, wells and highway access work in Arizona?

Arizona’s water summary identifies special groundwater management regimes in 11 counties, but those county counts do not establish the management-area boundary for an individual parcel.²⁵ Ask the Arizona Department of Water Resources whether the proposed well location falls within a managed area and qualifies for the proposed use; ADWR regulates all Arizona groundwater wells.¹¹ ADWR describes domestic exempt wells as equipped to pump 35 gallons per minute or less and constructible in many areas of Arizona.¹¹

Before drilling a new well or deepening or modifying an existing well, file a Notice of Intent to Drill with ADWR; a licensed well-drilling contractor must perform the work.¹¹ For access work within state highway right-of-way, ADOT requires an encroachment permit issued by the relevant district office.²⁶ Arizona highway access permits are non-transferable, so a new property owner must apply for a new access permit, and driveway improvements or changes require engineering plans for approval.²⁷

Watch-outs

• County zoning counts concern unincorporated Arizona land; cities and towns with their own building-permit ordinances are outside the general county building-permit rule.⁵¹³
• Arizona’s owner-builder exemption does not remove local building-permit requirements, and selling or renting within 1 year after completion or issuance of a certificate of occupancy is evidence of an intent to sell or rent.¹⁰
• An unanswered county RV or tiny-home question is not permission to occupy a parcel; ask the county zoning office for the proposed use’s requirements.⁷⁸
• Even where residential building-permit requirements are limited, Arizona septic applications still follow the county application route and well drilling still requires an ADWR Notice of Intent to Drill.³⁶¹¹

Sources

1. Bolthole Index county rulebook, 15 Arizona counties, as of October 10, 2026: Arizona counties that do not require a residential building permit in unincorporated areas
2. Bolthole Index county rulebook, 15 Arizona counties, as of October 10, 2026: Arizona counties that require a residential building permit in unincorporated areas
3. Bolthole Index county rulebook, 15 Arizona counties, as of October 10, 2026: Arizona counties that require a residential building permit only in some cases (for example floodplain or certain structures)
4. Bolthole Index county rulebook, 15 Arizona counties, as of October 10, 2026: Arizona counties with county zoning
5. Arizona: 11-801 - Definitions, quoted and re-checked
6. Arizona: Onsite Wastewater Treatment Facility | ADEQ, quoted and re-checked
7. Bolthole Index county rulebook, 15 Arizona counties, as of October 10, 2026: Arizona counties' answers on living in an RV on your own land
8. Bolthole Index county rulebook, 15 Arizona counties, as of October 10, 2026: Arizona counties' answers on living in a tiny home on your own land
9. Bolthole Index county rulebook, 15 Arizona counties, as of October 10, 2026: Arizona counties with neither a residential building permit nor county-wide zoning
10. Arizona: Persons not required to be licensed; penalties; applicability, quoted and re-checked
11. Arizona Department of Water Resources — Well Drilling (azwater.gov)
12. Bolthole Index county rulebook, 15 Arizona counties, as of October 10, 2026: Median of Arizona's county effective property tax rates and median county property tax bills
13. Arizona: Building permits; issuance; state preemption; utilities; distribution of copies; subsequent owner; limitation; definition, quoted and re-checked
14. Arizona: 11-861. Adoption of codes by reference; limitations; method of adoption; fire sprinklers; fire apparatus access roads or approved routes; intent; state preemption; fire watch requirements; pool barrier gates; refrigerants, quoted and re-checked
15. Bolthole Index county rulebook, 15 Arizona counties, as of October 10, 2026: Arizona counties with no county-wide zoning
16. Arizona: 11-831 - Review of land divisions; definitions, quoted and re-checked
17. Arizona: 11-811 - Zoning ordinance; zoning districts; definitions, quoted and re-checked
18. Arizona: 11-811 - Zoning ordinance; zoning districts; definitions, quoted and re-checked
19. Arizona: A.R.S. § 11-812 — Restriction on regulation; exceptions; aggregate mining regulation; definitions, quoted and re-checked
20. Bolthole Index county rulebook, 15 Arizona counties, as of October 10, 2026: Who issues septic permits across Arizona's counties: a state agency, a multi-county health district, or the county
21. Arizona Department of Environmental Quality — Engineering Review (vei.azdeq.gov)
22. Arizona: 33-2101 - Application; duration of stay; exclusions; notice and pleading requirements, quoted and re-checked
23. Bolthole Index county rulebook, 15 Arizona counties, as of October 10, 2026: The 8 highest-scoring Arizona counties on the Bolthole Index (off-grid and homestead land score out of 100), with each one's building-permit, zoning and septic answers
24. Bolthole Index county rulebook, 15 Arizona counties, as of October 10, 2026: Median farmland value per acre across Arizona's counties (USDA census, the middle county's value; USD/acre), with the five least expensive counties
25. Arizona water rights and groundwater management: National Agricultural Law Center and Bolthole Index groundwater review
26. Arizona Department of Transportation — Encroachment Permits (azdot.gov)
27. Arizona: Encroachment Permits Guideline & Procedures 2024, quoted and re-checked

Written October 10, 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.