Bolthole Index

Maricopa County, Arizona

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

21Index Score / 100
#15 of 15 in Arizona

Unincorporated Maricopa County, Arizona requires a building permit for a home, with exemptions for specified work1. County zoning applies outside municipal limits2. Maricopa County Environmental Services handles septic permits, reviews, and inspections in unincorporated areas34. Living or sleeping in an RV or camping trailer is generally prohibited unless an applicable exception or Temporary Use Permit applies5.

At a glance

Building permit
Required for a home in unincorporated areas, subject to listed permit exemptions1
Zoning
Yes outside municipal limits; cities and towns may administer different zoning rules2
Minimum lot size
District-specific, from 6,000 sq ft up to 190,000 sq ft6
RV / camping trailer occupancy
Generally prohibited for living; temporary housing and caretaker uses require applicable Temporary Use Permit approval7
Agricultural exemption
Conditional on county approval and commercial agricultural classification; homes are not exempt8
Septic permit
Required; county Environmental Services issues Construction Authorizations on ADEQ's behalf39
Septic soils
Only 28% of soils are free of severe limits for a conventional drain field10
Owner-builder exemption
Available for a home built solely for your own occupancy, not for sale or rent11

Who to call

Planning & zoning

Maricopa County Planning & Development

Building permits, inspections, zoning administration, and Floodplain Use Permits for unincorporated Maricopa County

(602) 506-3301

301 W. Jefferson St., Suite 170, Phoenix, AZ 85003

Online permits →

Septic permits

Maricopa County Environmental Services - Onsite Wastewater Program

Onsite wastewater (septic) applications, Construction Authorizations, and final inspections for unincorporated Maricopa County, issued on ADEQ's behalf

602-506-6666

septicquestions@maricopa.gov

Online permits →

Contact details are copied from each office’s official page and were checked against it on October 16, 2026.

Off-grid gear

Going off-grid in Maricopa County means bringing your own water and power. The kit we’d start with:

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Do you need a building permit in Maricopa County, Arizona?

Unincorporated Maricopa County requires a building permit for a home, with exemptions for specified minor, temporary, and existing work1. Inside Peoria and Wickenburg, municipal offices issue building permits; Apache Junction, mostly in Pinal County but reaching into Maricopa County, also issues its own building permits121314. Septic authorization in Peoria remains with Maricopa County Environmental Services15. The county has adopted the 2018 International Building and Residential Codes and 2017 National Electrical Code, with amendments16. Arizona's owner-builder exemption covers work intended solely for the owner's occupancy, not sale or rent; the contractor-licensing exemption does not waive county building permits or inspections111718.

Who issues building permits in Maricopa County, and how do you reach the office?

Maricopa County Planning & Development, at 301 W. Jefferson St., Suite 170 in Phoenix, handles building permits in unincorporated Maricopa County191. The same department handles floodplain permits for unincorporated county land: citizens should contact Planning & Development, for floodplain regulation and Floodplain Use Permits1920. Applications go through the county's online Permit Center, where you set up an account, answer the decision engine's questions, submit required documents, and pay any upfront fees before the project is accepted for review21. Fees vary by project type, valuation, and site-specific factors rather than a flat published schedule22.

Does Maricopa County have zoning?

Maricopa County zoning applies outside municipal limits; Peoria, Wickenburg, and Queen Creek set their own zoning, as does Apache Junction, a mainly Pinal County city reaching into Maricopa County223242526. Peoria's municipal zoning does not transfer septic authorization from Maricopa County Environmental Services15. On unincorporated land, minimum lots range from 190,000 square feet in RU-190 to 6,000 square feet in R1-6; setbacks depend on the district627. A single-family lot may have an attached and a detached accessory dwelling unit, independently occupied or leased for long-term housing, subject to size, setback, access, and other limits28. Agricultural exemption requires county approval and commercial agricultural classification and does not cover a home8. We could not confirm minimum dwelling floor area; ask Planning & Development about the proposed home19.

How do septic permits work in Maricopa County?

Maricopa County Environmental Services administers onsite wastewater systems, reviews site and soils work, issues Construction Authorizations, and performs final inspections in its service area4. A conventional septic project requires site-and-soils evaluation, a design application, and Construction Authorization before installation by a licensed Arizona contractor3. Only 28% of Maricopa County's soils are free of severe limitations for a conventional drain field, and the county process requires a final inspection before discharge authorization1029. A project must provide either a gravity-sewer connection or a permitted onsite wastewater system; utility-served projects may also need the utility's water-service agreement or wastewater-capacity form, but that project-specific requirement does not mean every parcel can or must connect to a utility30. Composting toilets are a county permit category rather than an unrestricted off-grid workaround31.

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

Generally, no for vehicle-based occupancy. Unincorporated Maricopa County prohibits using travel trailers, camping trailers, truck campers, and motor homes for living, sleeping, or housekeeping unless an applicable exception or Temporary Use Permit applies5. A caretaker RV may qualify only through a Temporary Use Permit when unusual conditions justify on-site caretaker housing7. Storing an unoccupied camping vehicle is different: the zoning ordinance places it in a rear or side yard and allows front-yard loading or unloading for up to 72 hours5. We could not confirm a distinct tiny-home rule; ask Planning & Development whether a small unit qualifies as a code-compliant dwelling, manufactured home, or accessory dwelling unit for the parcel193228. An approved accessory dwelling unit may be occupied or leased independently for long-term housing, but that does not turn an RV into a dwelling285.

What are the steps to build a home in Maricopa County?

  1. Confirm that the parcel is outside municipal limits and identify its zoning district in PlanNet before relying on county rules33.
  2. Check the district's lot size and setbacks, then ask Planning & Development what plans and drainage documents the project needs62719.
  3. Determine whether the site will use gravity sewer or permitted septic, and start the required county septic-permit process early if needed303.
  4. If you plan a private domestic well, file the state Notice of Intent and obtain local health review first when the parcel is 5 acres or less34.
  5. Apply through the county Permit Center with the required documents and upfront fees21.
  6. Obtain a Floodplain Use Permit for floodplain development and an MCDOT permit before building a driveway or doing other work in county right-of-way2035.
  7. Keep permitted work accessible and exposed until it passes inspection, and complete the septic inspection3629. Then obtain a Certificate of Occupancy, which unincorporated Maricopa County requires for every permit except those issued over the counter, minor permits, unoccupied structures, and work exempt under Section 105.237. Permanent utility authorization is not granted until the permanent Certificate of Occupancy is issued, apart from temporary construction power or temporary gas clearances needed for testing, so schedule final inspections before you need permanent power37. A Temporary Certificate of Occupancy requires concurrence of affected departments, a signed acknowledgement, fees, approved safety inspections, and any required bonding; unfinished work alone does not qualify a home for temporary occupancy37.

What should you check before buying land in Maricopa County?

Confirm parcel jurisdiction first because county zoning governs land outside municipal limits while a city or town may apply different rules38. Verify legal access and recorded easements; MCDOT requires a permit before a private party builds a driveway or performs other work within county right-of-way in unincorporated Maricopa County35. Only 28% of county soils are free of severe septic limitations, so test the site before assuming a conventional drain field will work10. Maricopa County is projected to average 122.2 days a year at or above 100°F by mid-century and has experienced severe drought in 30.4% of recent years, making a verified water source and realistic cooling plan essential3940. For recently divided land, confirm county plat approval and recording41. The effective property tax rate is about 0.5%, with a typical annual bill near $1,9654243.

Watch-outs

  • Unincorporated Maricopa County generally prohibits living or sleeping in travel trailers, camping trailers, truck campers, and motor homes unless an applicable exception or Temporary Use Permit applies5.
  • On unincorporated Maricopa County land, a short-term rental must be rented as a whole unit, only one may operate per parcel at a time, and an owner must live on the property if it contains an accessory dwelling unit unless the County issued the ADU's final approval on or before September 13, 202444.
  • Only 28% of the county's soils are free of severe limitations for a conventional septic drain field, so budget for site testing and possibly an alternative system before you buy10.

Sources

  1. Permitting Services, quoted and re-checked
  2. Maricopa County Zoning Ordinance Update, quoted and re-checked
  3. Onsite Wastewater Forms / Applications, quoted and re-checked
  4. Site Investigation and Soils Evaluation for an On-Site Wastewater Treatment Facility Instructions, quoted and re-checked
  5. Maricopa County Zoning Ordinance, quoted and re-checked
  6. Maricopa County Zoning Ordinance, quoted and re-checked
  7. Maricopa County Zoning Ordinance, quoted and re-checked
  8. Zoning for Agricultural and Equestrian Uses - DD-2017-05, quoted and re-checked
  9. Site Investigation and Soils Evaluation for an On-Site Wastewater Treatment Facility Instructions (2026 county census)
  10. Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
  11. 32-1121 - Persons not required to be licensed; penalties; applicability, quoted and re-checked
  12. Peoria: Sec. 18-21. International Building Code—Adopted and Amended (Maricopa County), quoted and re-checked
  13. Town of Wickenburg: Permits (Maricopa County), quoted and re-checked
  14. Apache Junction: § 7-1-6 Permits (Maricopa County), quoted and re-checked
  15. Peoria: Onsite Wastewater (Septic) Program Guidance for Municipalities (Maricopa County), quoted and re-checked
  16. Adopted Regulations, quoted and re-checked
  17. Persons not required to be licensed; penalties; applicability (Arizona statewide rule), quoted and re-checked
  18. Residential Construction, quoted and re-checked
  19. Maricopa County Planning & Development (hsd.maricopa.gov)
  20. Permits, quoted and re-checked
  21. Residential Construction, quoted and re-checked
  22. Fee Schedule and Estimators, quoted and re-checked
  23. Peoria: Sec. 21-420. Property Development Standards for Permitted Principal Uses (Maricopa County), quoted and re-checked
  24. Town of Wickenburg: Zoning Ordinance Number 1078 (Maricopa County), quoted and re-checked
  25. Town of Queen Creek: Planning and Zoning | Queen Creek, AZ (Maricopa County), quoted and re-checked
  26. Apache Junction: Apache Junction, AZ Laws (Maricopa County), quoted and re-checked
  27. Maricopa County Zoning Ordinance, quoted and re-checked
  28. Maricopa County Zoning Ordinance, quoted and re-checked
  29. Onsite Wastewater Forms / Applications, quoted and re-checked
  30. Maricopa County Environmental Services review for Mariposa Energy Park, quoted and re-checked
  31. Site Investigation and Soils Evaluation for an On-Site Wastewater Treatment Facility Instructions, quoted and re-checked
  32. Maricopa County Zoning Ordinance, quoted and re-checked
  33. Maricopa County Zoning Ordinance, quoted and re-checked
  34. Permitting and Wells Overview, quoted and re-checked
  35. Permits, quoted and re-checked
  36. Structures Without a Permit - DD-2018-07, quoted and re-checked
  37. Maricopa County Local Additions & Addenda, quoted and re-checked
  38. Maricopa County Zoning Ordinance Update, quoted and re-checked
  39. Projected mid-century days at or above 100°F: Bolthole Index county data
  40. Share of years in severe drought: Bolthole Index county data
  41. Maricopa County Subdivision Regulations, quoted and re-checked
  42. Effective property tax rate: Bolthole Index county data
  43. Median property tax bill: Bolthole Index county data
  44. Maricopa County Zoning Ordinance, quoted and re-checked

Written October 16, 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.

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Compared with neighboring counties

Like all 6 of its neighbors, Maricopa County requires a building permit for a home.

RuleMaricopa CountyLa Paz CountyYuma CountyPinal CountyYavapai CountyPima CountyGila County
Building permitRequiredRequiredRequiredRequiredRequiredRequiredRequired
County zoningYesYesYesYesYesYesYes
Septic permitsCounty Env. Services Dept.County Community Development Dept.County Development ServicesCounty Air Quality & Env. HealthCounty Development ServicesPima CountyCounty Community Development Div.

County locator

Maricopa County in Arizona

21
County map
Maricopa County highlighted among the Arizona counties · colored by Index score

How Maricopa County scores

Seclusion12100% ev.
Self-Sufficiency1398% ev.
Admin Boringness48100% ev.
Durability35100% ev.
Property Autonomy65100% ev.
Carry Cost67100% ev.

Evidence strength: 99%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$461kTypical home
0.5%Property tax
$7,203Land / acre
8.6"Annual rain
30.4% of yrsSevere drought
122.2 / yr (+32)Mid-century 100°F days
74.4 daysMid-century dry spell
1.03" (+7.8%)Mid-century 1-day rain
1.11×Wildfire change factor
100%Forward climate coverage
$1,249Home insurance / yr
2.8% / yrInsurance growth
1.56%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
5,376,074People within 2 hr
515,620Radius comparison (15 mi)
498.4People / sq mi
54.6%Federal land
66.8%Land at 15% slope or less
28%Soils rated "not limited" for septic (strict USDA rating)
1,425,940 acWorkable land screen
4.9%Wooded land
6.2 tonsBiomass / forest ac
71.3°FAvg temp

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Cities and towns in Maricopa County

Inside a city or town, that city usually issues building permits and sets zoning; the county’s rules above cover unincorporated land. Septic, wells and floodplain rules usually stay with the county or state everywhere.

Not yet researched: Town of Fountain Hills · Goodyear · Town of Guadalupe · Phoenix · Town of Youngtown

Answers from the rulebook for Maricopa County

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

Maricopa County rules

  • Building permitRequired

    Building construction and other work subject to the Maricopa County Building Code in unincorporated Maricopa County.

    • The county code contains permit exemptions under Section 105.2, including listed temporary, minor, existing-structure, roadway-gate, electrical, mechanical, and plumbing work.
    • An Annual Facility Permit may substitute for individual permits for qualifying alterations to an already approved facility when the work does not increase floor area, does not change use or occupancy classification, and is performed on existing buildings, structures, and associated utilities; technical-code compliance and inspection before concealment remain required.
    • Structures under an approved Temporary Use Permit do not require a building permit when standing no more than 96 contiguous hours, subject to the stated documentation and building-safety-code conditions.
    • A building permit is not required for a building or structure or lawfully existing land use as of January 1, 2000, or the effective date of a later amendment, if there are no visible defects or unsafe conditions; when required by the Building Official, a Certificate of Observable Compliance must be submitted.
    • Work commenced before permit issuance is subject to an additional fee, stated by the county code as the building permit fee doubled.
    • Incorporated cities and towns use their own permitting processes rather than this unincorporated-county process.

    temporary-use structure maximum duration: <= 96 contiguous hours (Must be under an approved Temporary Use Permit and comply with applicable building safety codes and manufacturer specifications.) · annual facility permit renewal interval: 12 months (Renewal requires payment of the applicable Maricopa County Schedule of Fees before permit expiration.)

    “Determine what type of project you are doing. If you are building or remodeling in unincorporated Maricopa County [See Map Opens a New Window. ] you're in the right place. Otherwise, you'll start the permitting process with your city or town.”
  • Building code adoptedAdopted (with conditions)

    Maricopa County Local Additions and Addenda and adopted national construction codes administered by the county.

    • The 2018 International Green Code and 2018 International Energy Conservation Code are voluntary.
    • The codes with amendments became effective 30 days after Board of Supervisors approval, with a grace period through December 30, 2022 before mandating the new codes.
    • The cited official materials show a later 2024-code amendment proposal, but do not state that the 2024 codes had been adopted by the retrieval date.

    Board of Supervisors approval date: 2022-08-17 · effective period after approval: 30 days (with a grace period through 2022-12-30 before mandating new codes) · International Building Code edition: 2018 · International Residential Code edition: 2018 · National Electrical Code edition: 2017

    “Text Amendment to the Maricopa County Local Additions & Addenda to adopt and amend the following construction safety codes: 2018 International Building Code, 2018 International Residential Code, 2018 International Plumbing Code, 2018 International Mechanical Code, 2018 International Fuel Gas Code, 2018 International Green Code (voluntary), 2018 International Energy Conservation Code (voluntary), 2018 International Existing Building Code, and 2017 National Electric Code. These codes with amendments become effective 30 days after BOS approval with a grace period through 30 December 2022 before mandating new codes.”
  • InspectionsRequired

    Construction or work for which a building permit is required in unincorporated Maricopa County.

    • The construction or work must remain accessible and exposed for inspection until approved.
    • The permit applicant must cause the work to remain accessible and exposed for inspection purposes.
    • The rule applies to work for which a permit is required; it does not establish that every residential project, including permit-exempt work, requires inspection.
    • The county code places responsibility on the permit holder to submit requests for all required inspections and provides for re-inspection fees in listed circumstances, including covered work, lack of access, work not ready, late cancellation, deviations requiring revised plans, or incomplete correction lists.
    “Construction or work for which a permit is required shall be subject to inspection by the building official and such construction or work shall remain accessible and exposed for inspection purposes until approved.”
    One more reviewed finding on this topic
    • Required — Residential construction subject to Maricopa County building permitting in unincorporated Maricopa County.
      “It shall be the responsibility of the permit holder to: 1. Submit requests for all required inspections.”
  • Certificate of occupancyRequired

    County building permits in unincorporated Maricopa County where the permitted work results in an occupied structure or otherwise falls within the county certificate-of-occupancy rule.

    • A Certificate of Occupancy is required for all permits except permits issued over the counter, minor permits, structures that will not be occupied, and work exempt from permits under Section 105.2.
    • The certificate is intended to confirm that department, Fire Jurisdiction, plan, and safety inspection requirements have been met and that the building is safe for occupancy and use.
    • A Certificate of Completion may be issued upon request for other permits after all required inspections have been approved.
    • A Temporary Certificate of Occupancy may be issued before all permitted work is complete only with impacted department approvals, signed acknowledgement, appropriate fees, scheduled/conducted/approved safety inspections, and required bonding; incomplete portions must remain safe.
    • Permanent utility authorization is not authorized until a permanent Certificate of Occupancy has been issued, except for temporary construction power or temporary gas clearances required for testing.
    “A Certificate of Occupancy is required for all permits. Exceptions: 1. Permits issued over the counter. 2. Minor permits 3. Structures that will not be occupied. 4. Work exempt from permits in accordance with 105.2”
    One more reviewed finding on this topic
    • Limited — Maricopa County permits governed by the County Local Additions and Addenda in unincorporated Maricopa County.
      “A Certificate of Occupancy is required for all permits. Exceptions: 1. Permits issued over the counter. 2. Minor permits 3. Structures that will not be occupied. 4. Work exempt from permits in accordance with 105.2”
  • County-wide zoningPresent (with conditions)

    Maricopa County Zoning Ordinance regulation of land in the unincorporated parts of Maricopa County.

    • The ordinance applies to unincorporated areas; incorporated municipalities may administer their own land-use regulations.
    • The MCZO includes rural, residential, commercial, and industrial zoning districts and development standards.
    “The Maricopa County Zoning Ordinance (MCZO) regulates the growth and development of land within the unincorporated parts of the County. The MCZO includes zoning districts for rural, residential, commercial, and industrial land uses and establishes development standards in the interest of protecting the public health, peace, safety, comfort, convenience, and general welfare of the residents.”
  • Local zoningVaries (with conditions)

    Local zoning across Maricopa County, aggregated across county-administered unincorporated territory and incorporated municipalities.

    • Maricopa County administers the MCZO in the unincorporated area only.
    • The county source does not establish that Maricopa County administers zoning inside incorporated municipalities; municipal rules may apply there.
    • Within the unincorporated area, the MCZO regulates rural, residential, commercial, and industrial zoning districts and development standards.
    “The Code Compliance Division only has jurisdiction over zoning violations within the unincorporated areas of Maricopa County. [...] For more information on reporting a violation outside the jurisdiction of Maricopa County, please select the appropriate city or town listed below:”
  • Zoning districtsPublished

    Zoning districts and electronic zoning-district boundaries for the part of Maricopa County outside the corporate limits of any municipality.

    • The published County zoning districts apply outside municipal corporate limits; incorporated municipalities may administer their own zoning rules.
    • The ordinance identifies rural, single-family residential, multiple-family residential, commercial, industrial, and overlay zoning districts.
    • The boundaries are shown electronically on maps designated as PlanNet, and those maps and associated notations and information have the same force and effect as if fully set forth in the ordinance.
    • The current ordinance is identified by the County as adopted January 9, 2026.
    “For the purpose of this Ordinance, that part of Maricopa County outside the corporate limits of any municipality is hereby classified into the following zoning districts:”
  • Minimum lot sizeDistrict specific (with conditions)

    Residential and rural zoning districts in the unincorporated area of Maricopa County.

    • The applicable minimum depends on the zoning district.
    • Multiple-family districts also impose minimum lot area per dwelling unit.
    • The ordinance states the zoning ordinance regulates the entire unincorporated area; incorporated municipalities may apply their own rules.

    minimum lot area by district: RU-190: 190,000 sq. ft.; RU-70: 70,000 sq. ft.; RU-43: 43,560 sq. ft.; R1-35: 35,000 sq. ft.; R1-18: 18,000 sq. ft.; R1-10: 10,000 sq. ft.; R1-8: 8,000 sq. ft.; R1-7: 7,000 sq. ft.; R1-6: 6,000 sq. ft.; R-2 through R-5: 6,000 sq. ft. per lot sq. ft. · minimum lot area per dwelling unit: R-2: 4,000 sq. ft.; R-3: 3,000 sq. ft.; R-4: 2,000 sq. ft.; R-5: 1,000 sq. ft. sq. ft.

    “Lot Area Minimum (sq. ft.) 190,000 70,000”
  • SetbacksDistrict specific (with conditions)

    Primary structures in the RU-190, RU-70, RU-43, R1-35, R1-18, R1-10, R1-8, R1-7, R1-6, R-2, R-3, R-4, and R-5 zoning districts in unincorporated Maricopa County.

    • The updated ordinance applies to the unincorporated area of Maricopa County; incorporated municipalities are outside this county zoning scope.
    • Primary-structure front setbacks, in district order RU-190 through R-5, are 60, 60, 40, 40, 10 or 18, 10 or 18, 10 or 18, 10 or 18, 10 or 18, 10, 10, 10, and 10 feet.
    • Primary-structure street-side setbacks, in district order RU-190 through R-5, are 30, 30, 20, 20, and 10 feet for each remaining district.
    • Primary-structure interior-side setbacks, in district order RU-190 through R-5, are 30, 30, 20, 20, 10, 7, 7, 5, 5, 5, 5, 5, and 5 feet.
    • Primary-structure rear setbacks, in district order RU-190 through R-5, are 60, 60, 40, 40, 30, and 25 feet for each remaining district.
    • The 10-foot front setback is not less than 18 feet to the plane of the front-facing garage where the footnote applies.
    • Through lots require a front yard on both front lot lines.
    • The ordinance also contains separate accessory-structure and detached-ADU setback rules, including a five-foot minimum from side or rear lot lines for detached ADUs and a maximum 30% occupancy of any required yard.

    primary structure front setback by district: RU-190=60; RU-70=60; RU-43=40; R1-35=40; R1-18=10 or 18; R1-10=10 or 18; R1-8=10 or 18; R1-7=10 or 18; R1-6=10 or 18; R-2=10; R-3=10; R-4=10; R-5=10 ft (10 ft minimum but no less than 18 ft to the plane of the front-facing garage) · primary structure street-side setback by district: RU-190=30; RU-70=30; RU-43=20; R1-35=20; R1-18=10; R1-10=10; R1-8=10; R1-7=10; R1-6=10; R-2=10; R-3=10; R-4=10; R-5=10 ft · primary structure interior-side setback by district: RU-190=30; RU-70=30; RU-43=20; R1-35=20; R1-18=10; R1-10=7; R1-8=7; R1-7=5; R1-6=5; R-2=5; R-3=5; R-4=5; R-5=5 ft · primary structure rear setback by district: RU-190=60; RU-70=60; RU-43=40; R1-35=40; R1-18=30; R1-10=25; R1-8=25; R1-7=25; R1-6=25; R-2=25; R-3=25; R-4=25; R-5=25 ft

    “Side, interior (ft.) – setback minimums 30 30 20 20 10 7 7 5 5 5 5 5 5 See figures.”
  • Living in an RVLimited

    Occupancy of mobile homes, travel trailers, camping trailers, truck campers, and motor homes for living, sleeping, or housekeeping purposes in unincorporated Maricopa County.

    • The MCZO generally prohibits occupancy for living, sleeping, or housekeeping purposes.
    • Mobile homes and travel trailers intended for temporary housing require a Temporary Use Permit.
    • A recreational vehicle may serve as caretaker quarters only through a Temporary Use Permit and only when unusual conditions justify on-site caretaker residency.
    • Only one additional caretaker dwelling unit may be permitted on a property.
    • Travel trailers and other listed vehicles stored outside a garage or carport must be in the rear or side yard, outside the required front yard except for loading or unloading up to 72 hours, with a five-foot clear path around structures.

    maximum loading/unloading period: <= 72 hours (does not authorize occupancy for living, sleeping, or housekeeping purposes)

    “At no time shall the mobile home, travel trailer [...] be occupied”
  • Camping on your landLimited

    Temporary camping or overnight occupancy in travel trailers, camping trailers, truck campers, and motor homes in unincorporated Maricopa County.

    • The MCZO prohibits use of these vehicles for living, sleeping, or housekeeping purposes unless an applicable exception or Temporary Use Permit applies.
    • Storage outside a garage or carport is limited to the rear or side yard, outside the required front yard except for loading and unloading up to 72 hours, and must maintain a five-foot clear path around structures.
    • The source does not address tent camping or camping on public lands.

    loading/unloading period: <= 72 hours (storage remains subject to the prohibition on living, sleeping, or housekeeping use)

    “If a travel trailer, aircraft, boat, camping trailer, truck camper or motor home is located or stored outside of a garage or carport it shall be only placed in the rear yard of the lot or side yard of the lot but not within the required front yard except that for loading and unloading purposes may be permitted for a period of time not to exceed 72 hours. Such storage shall maintain a five (5) foot clear path around any structures. Such storage shall not be occupied for living, sleeping or housekeeping purposes per Article 814.1.”
  • Manufactured homesLimited

    Residential occupancy of manufactured homes in unincorporated Maricopa County where the home satisfies the County's single-family-dwelling and location requirements.

    • A manufactured home qualifies as a single-family dwelling only when permanently affixed to the property.
    • Manufactured homes may be located in mobile-home/manufactured-home parks subject to park-development standards and applicable plumbing and health-code requirements.
    • Mobile-home/manufactured-home park spaces and setbacks are regulated by Chapter 9, Section 903.
    • The cited provisions do not establish unrestricted placement on every parcel; zoning-district permissions and development requirements still apply.

    mobile-home space area: >= 3000 square feet · average mobile-home-space width: >= 44 feet · setback from mobile-home-space boundary: >= 5 feet · setback from lot lines or required park screening: >= 10 feet · minimum distance between homes or accessory structures in a mobile-home park: >= 10 feet

    “provided it is permanently affixed to the property.”
  • Accessory dwellingsAllowed (with conditions)

    Accessory dwelling units on lots or parcels zoned for single-family residential use in unincorporated Maricopa County.

    • ADUs are permitted on any lot or parcel zoned for single-family residential use; no public hearing, variance, or special permit is required.
    • At least one attached and one detached ADU are permitted where a single-family dwelling is allowed.
    • On a lot or parcel of one acre or larger, at least one additional detached ADU is permitted if at least one ADU is deed-restricted affordable and rented to households earning up to 80% of area median income.
    • No ADU may exceed the principal dwelling in size.
    • On lots or parcels under one acre, an ADU is limited to 75% of the primary dwelling or 1,000 square feet, whichever is less.
    • ADUs may be leased or occupied independently as long-term rental housing.
    • Detached ADUs have five-foot side and rear lot-line setbacks, a maximum 18-foot height when encroaching into required side or rear yards, and may occupy no more than 30% of any required yard.
    • All ADUs must share one street access point with the primary residence.
    • No more than one ADU may be used as a short-term rental.

    additional detached ADU affordability threshold: <= 80 percent of area median income (applies to at least one ADU when using the additional detached ADU allowance on a lot or parcel of at least one acre) · ADU size on lot or parcel under one acre: 75% of primary dwelling or 1,000 square feet, whichever is less · detached ADU side/rear setback: >= 5 feet · detached ADU height when encroaching into required side/rear yard: <= 18 feet

    “ADUs may be leased or occupied independently”
  • Who permits septicCounty

    On-site wastewater systems in unincorporated Maricopa County administered through the Maricopa County Environmental Services Department Onsite Wastewater Program.

    • The cited process is for conventional onsite wastewater treatment facilities; alternative systems may have additional design or review requirements.
    • The source identifies MCESD as conducting site and soils evaluations, reviewing NOID submissions, issuing Construction Authorizations, and conducting final inspections.
    “Review of the NOID submission [...] is done by MCESD.”
  • Septic permitRequired

    Construction and installation of onsite wastewater treatment facilities in Maricopa County's county-administered service area.

    • A Phase I application must be submitted with supporting documentation and applicable fees.
    • A Phase II NOID application must be submitted with supporting documentation and applicable fees.
    • A Construction Authorization is issued before installation, with required stipulations.
    • A licensed Arizona contractor must install the system according to approved plans.
    • The cited conventional septic process includes site and soils evaluation and design requirements.

    conventional septic design flow threshold: < 3000 gallons per day (The cited fee and licensing entries separately list systems from 3,000 to less than 24,000 gallons per day.)

    “To apply for the following permits listed below, visit our Permit Center page. [...] Septic Permit Application [...] Notice of Transfer Application”
  • Septic inspectionRequired

    Site, construction, and final inspections for onsite wastewater systems in Maricopa County's county-administered service area.

    • The Phase I process requires an inspection request after test holes are prepared.
    • Final inspection is scheduled through a Request for Discharge Authorization.
    • Final inspection verifies installation against the Construction Authorization and includes septic-tank watertightness and open-trench inspections.
    • Deficiencies require correction and re-inspection; alternative systems may require stamped and signed as-built drawings.

    site evaluation test holes: 3 holes (Two are in the proposed primary disposal area and one is in the reserve area.) · test-hole depth: >= 12 feet (The instructions also state the holes must be 5 feet deeper than the proposed overall disposal-field depth.) · onsite system site inspection fee: 325 USD (The fee schedule lists an onsite additional inspection at $325 as well.)

    “To request a final inspection, complete a Request for Discharge Authorization (PDF) form”
  • Off-grid sanitationAllowed (with conditions)

    Composting toilets and other onsite sanitation systems regulated through Maricopa County's Onsite Wastewater Program.

    • The county's licensing schedule lists composting toilets with less than 3,000 gallons per day as a permit category.
    • The system remains subject to county application, review, fees, and applicable onsite wastewater requirements.
    • The cited source does not establish unrestricted use or exemption from permitting.

    composting toilet flow: < 3000 gallons per day

    “Composting Toilet (less than 3,000 gallons per day)”
  • Mandatory utility hookupConditional

    Projects or sites seeking entitlement for development and use of sanitary facilities in unincorporated Maricopa County.

    • The project must provide either connection to a gravity sewer system or permitted onsite wastewater treatment facilities.
    • For utility-provided water or reclaimed water, a Water Service Agreement signed by the utility is required for submission to MCESD's Subdivision & Infrastructure Program.
    • For utility-provided wastewater service, a Capacity Assurance Form issued by the utility is required.
    • The cited source is a project-specific MCESD review and does not establish that every parcel countywide has access to or must connect to a particular utility.
    “require connection to a gravity sewer system or permitted onsite wastewater treatment (septic) facilities to support the development.”
  • Agricultural exemptionConditional

    Agricultural uses in unincorporated Maricopa County, including uses in any county zoning district.

    • A Land Use (Agricultural Exemption) application must be administratively approved.
    • A commercial agricultural classification from the Assessor's Office is a prerequisite to administrative approval.
    • The exemption does not cover non-agricultural structures or uses such as a single-family residence, swimming pool, or barbecue.
    • General agricultural purposes are described as eligible when the tract is five or more contiguous commercial acres.
    • Specific eligible categories include cropland of at least 20 aggregate acres; agricultural composting of at least 5 contiguous commercial acres; grazing land with at least 40 animal units on at least 5 contiguous commercial acres; and specified equine, commodity, and dairy operations meeting the listed acreage conditions.
    • Rodeo structures, mounted cowboy shooting, certain riding lessons, horse rentals, off-site trail staging, and feed stores or roadside stands selling products not produced on site are not exempted.

    general agricultural tract threshold: >= 5 contiguous commercial acres · cropland threshold: >= 20 aggregate acres · grazing threshold: >= 40 animal units (also requires at least 5 contiguous commercial acres)

    “Agricultural uses will be exempted from the MCZO in any zoning district if a Land Use (Agricultural Exemption) application is administratively approved.”
  • Subdividing landRegulated (with conditions)

    Subdivision of land within unincorporated Maricopa County.

    • The subdivider must comply with the County Subdivision Regulations.
    • Preliminary and final plat approval by the Department is required.
    • The approved plat must be filed and recorded with the Maricopa County Recorder's Office.
    • The regulations were adopted August 6, 1990, revised October 23, 2024, and revised January 9, 2026 to update references after the December 10, 2025 zoning ordinance update.

    required approvals: preliminary plat and final plat

    “These subdivision regulations shall apply to all subdivisions of land, as defined herein, located within unincorporated areas of the County.”
  • Driveway accessRequired

    Construction of a driveway or other work within a Maricopa County right-of-way in unincorporated Maricopa County.

    • The rule applies to work within County rights-of-way in unincorporated Maricopa County and to work performed by an entity other than Maricopa County.
    • A permit must be issued before work begins.
    • MCDOT must review and approve plans before issuing the permit; the page states a target substantive plan-review time of 20 business days, with additional time possible for projects overlapping MCDOT Transportation Improvement Projects.
    • Permit fees include a plan review fee, permit fee, and processing fee, calculated by type of review.
    • Liability insurance is required on most projects and must remain in effect throughout the permit; permits terminate if coverage lapses.
    • A performance bond is required unless an applicable exception applies; the bond must assure completion and restoration under the permit and County standards.
    • Applications must include required plan-review fees and plans; additional County Engineer requirements may apply.

    target substantive plan review time: 20 business days (Projects overlapping MCDOT Transportation Improvement Projects may require additional time.)

    “The Maricopa County Department of Transportation (MCDOT) requires permits for all work within its right-of-way (ROW). [...] Building a driveway, sidewalk, curb or gutter”
  • Building in a floodplainRequired

    Development within a designated or delineated floodplain in Maricopa County.

    • The requirement applies to building, grading, filling, installing walls or fencing, and any other man-made change within a designated floodplain.
    • If the watercourse is not delineated, delineation may be required; once delineated, a Floodplain Use Permit is required before development.
    • Written authorization is issued through a Floodplain Use Permit signed by the Floodplain Administrator.
    • Other applicable federal, state, and local permits may also be required.
    • Floodplain development remains subject to drainage and grading requirements.
    “you are required to obtain a Floodplain Use Permit before you build, grade, fill”
  • Short-term rentalsLimited

    Short-term rental use in the unincorporated area of Maricopa County under Article 602.2 of the County Zoning Ordinance.

    • The STR must be a single-family dwelling or approved accessory dwelling unit leased or rented for no more than 30 consecutive days.
    • If the property contains an accessory dwelling unit, the owner must reside on the property unless the County issued the ADU certificate of occupancy, certificate of completion, or similar final approval on or before September 13, 2024.
    • The STR must be rented as a whole unit to a single party or individual; partial rentals by room or bed are prohibited.
    • Only one STR unit may be rented per parcel at any given time.
    • Commercial events, public assembly, special gatherings including weddings and banquets, signage or site-specific websites suggesting commercial operation, and operation of retail, food service, or another commercial enterprise from the STR are prohibited.
    • An STR may not be rented, leased, or occupied by a registered sex offender, and the renting party may not include such an individual.

    maximum rental duration: <= 30 consecutive days · STR units per parcel at any given time: 1 unit

    “A Short-Term Rental (STR) is the use of a single-family dwelling or an approved accessory dwelling unit for lease or rent for a duration of no more than 30 consecutive days.”
  • Permit feesVariable (with conditions)

    Planning and Development building, zoning, drainage, and related construction-permit fees in unincorporated Maricopa County.

    • Fees vary by project type, valuation, and the unique elements of the parcel or site.
    • Other County departments may conduct reviews and assess separate fees based on the level of review.
    • Initial or upfront fees are required when a project has been accepted for review.
    • All fees collected are applied toward the final cost of the permit.
    • Some permit types use the upfront fee as the full fee amount.
    “Fees will vary widely depending on the type of project, valuation, and all of the unique elements related to a particular parcel / site.”
  • Permit processPublished (with conditions)

    Residential construction permit applications in unincorporated Maricopa County.

    • Applicants must know the permit type, prepare site plans and required documents, provide contact, owner, and property information, meet document requirements, account for upfront fees if applicable, and determine lot coverage.
    • A Permit Center account is required before completing an application.
    • The Permit Center decision engine asks questions and prompts the applicant through the process.
    • Required PDF documents must be submitted and applicable upfront fees paid.
    • Building permits do not preclude enforcement of HOA CC&Rs.
    • Separate drainage requirements may apply.
    “You will complete the online application, submit required PDF documents and pay any upfront fees, if applicable.”

Arizona rules that apply here

  • Owner-builder exemptionAvailable (with conditions)

    An owner who improves property or builds or improves structures or appurtenances and performs the work personally, through the owner's employees, or through duly licensed contractors, when the property is intended solely for the owner's occupancy and is not intended for public occupancy, sale, or rent.

    • The exemption is from Arizona contractor-licensing requirements under A.R.S. § 32-1121; it does not itself eliminate any local building-permit requirement.
    • The structure or appurtenance must be intended for occupancy solely by the owner.
    • The structure or appurtenance must not be intended for occupancy by members of the public as the owner's employees or business visitors.
    • The structure or appurtenance must not be intended for sale or rent.
    • Sale, rent, or an arrangement by which the owner receives compensation from occupancy or transfer is included in the statutory definition of sale or rent.
    • Sale or rent, or an offer of sale or rent, within one year after completion or issuance of a certificate of occupancy is prima facie evidence that the project was undertaken for sale or rent.

    one-year post-completion evidence period: 1 year (Applies to the statutory prima facie evidence rule concerning sale or rent.)

    “who do the work themselves, with their own employees or with duly licensed contractors”
    One more reviewed finding on this topic
    • Conditional — Owners improving property or building structures in Arizona under the contractor-licensing exemption in A.R.S. § 32-1121(A)(5).
      “Owners of property who improve such property or who build or improve structures or appurtenances on such property and who do the work themselves”
  • Lot coverageDistrict specific (with conditions)

    County zoning regulations in Arizona's unincorporated county zoning districts.

    • A county board of supervisors may establish the percentage of a lot or parcel that may be covered by buildings.
    • The applicable percentage depends on the county zoning ordinance and district; this record does not supply a universal numeric percentage.

    maximum building lot coverage: percentage established by applicable county zoning ordinance percent

    “May establish the percentage of a lot or parcel that may be covered by buildings”
  • Building heightDistrict specific (with conditions)

    County zoning regulations governing the height and location of buildings in Arizona county zoning districts.

    • The applicable height standard depends on the county zoning ordinance and zoning district.
    • No universal statewide residential height limit was established by the reviewed statute.

    building height: regulated by applicable county zoning regulations

    “the height and location of buildings”
  • Well permitRequired

    Drilling a new groundwater well, or deepening or modifying an existing well, in Arizona, including Maricopa County.

    • A Notice of Intent to Drill must be filed with the Arizona Department of Water Resources before drilling, deepening, or modifying a well.
    • The filing must include the appropriate fee.
    • The authorization is valid for one year; after that, a new Notice of Intent must be filed.
    • A licensed well-drilling contractor must perform the work.
    • For domestic use on a parcel of 5 or fewer acres, the applicable county or local health authority must first review the application before submission to ADWR.
    • ADWR approval does not override other local requirements or ordinances that restrict well drilling.
    • Certain non-exempt wells in Active Management Areas may additionally require permits or groundwater rights.

    domestic parcel-size threshold for county or local health review: <= 5 acres (Applies when the well water is for domestic purposes.)

    “Prior to drilling a new well, or deepening or modifying an existing well, a person must file a Notice of Intent to Drill with the Department.”
  • Campground & park staysLimited

    The Arizona Recreational Vehicle Long-Term Rental Space Act applies to a recreational-vehicle space rented in a recreational-vehicle park or mobile-home park by the same tenant for more than 180 consecutive days, and to park-model or park-trailer spaces rented by the same tenant for more than 180 consecutive days.

    • For an ordinary recreational-vehicle space, the space must be rented under a rental agreement.
    • For a park model or park trailer, the chapter applies without regard to whether a rental agreement is executed.
    • The chapter does not apply to mobile homes, manufactured homes or factory-built buildings.
    • The chapter does not apply to a property with one or two recreational-vehicle rental spaces.

    occupancy duration: > 180 consecutive days · same tenant: required · property recreational-vehicle rental spaces: <= 2 spaces (The chapter does not apply to a property with one or two recreational-vehicle rental spaces.)

    “This chapter applies to, regulates and determines rights, obligations and remedies for a recreational vehicle space that is rented in a recreational vehicle park or”
    One more reviewed finding on this topic
    • Limited — Occupancy or use of a mobile home brought into Arizona, or movement of a mobile home from one Arizona mobile-home park to another Arizona mobile-home park.
      “unless it meets the standards adopted pursuant to this chapter and displays the proper state certificate.”
  • county zoning authorityGeneral

    Arizona county boards of supervisors adopting zoning for the county area outside incorporated municipalities, including unincorporated land.

    • The statutory definition of county area of jurisdiction is the part of the county outside the corporate limits of any municipality.
    • The zoning ordinance and rezonings and zoning-regulation amendments must be consistent with and conform to the adopted comprehensive plan.
    • The board must consider individual property rights and personal liberties before adopting a zoning ordinance.
    • The statute does not authorize dedications, exactions, fees, or other requirements not otherwise authorized by law.
    • The statute does not authorize regulation or restriction of railroad, mining, metallurgical, grazing, or general agricultural uses on tracts of five or more contiguous commercial acres, subject to the statutory cannabis and marijuana qualification.
    “Pursuant to this article, the board of supervisors may adopt a zoning ordinance in order to conserve and promote the public health, safety, convenience and general welfare.”
  • county building authorityGeneral

    Arizona county boards of supervisors requiring building permits and adopting building, related, and fire-prevention codes for construction in unincorporated areas, including residential construction.

    • Except in cities and towns with an ordinance relating to building permits, the board of supervisors shall require a permit for construction or additions exceeding $1,000 within its jurisdiction.
    • A county building code under section 11-861 applies to unincorporated areas of the county so zoned, and the board may exempt areas zoned rural or unclassified.
    • Building codes may be adopted by reference only after notice and hearings before the county planning and zoning commission and board of supervisors.
    • Authorized building, electrical, plumbing and mechanical codes must be adopted by a qualifying national code organization or by the largest city in the county; if a city code is adopted, the county must adopt notified changes within 90 days or terminate the adopted city code.
    • A fire-prevention code may be adopted in unincorporated areas where a fire district has not adopted a nationally recognized fire code; it remains effective until a fire district is established and adopts an applicable code.
    • The board may adopt a current wildland-urban interface code using written public-participation procedures.
    • Certain single-family and two-family residential sprinkler requirements are restricted, subject to the statutory exception for codes adopted before December 31, 2009.
    • A county may not deny a building permit based on the proposed capable and authorized utility provider, and may not require a transaction privilege tax or business license as a permit condition.
    • A county may recover reasonable costs associated with reviewing and issuing a building permit.

    building permit construction-cost threshold: > 1000 USD (The requirement does not apply in cities and towns that have an ordinance relating to issuance of building permits.) · city-code change adoption deadline: 90 days (If the county adopts a city code and does not adopt the same notified change within 90 days, it must terminate the adopted city code.) · preexisting sprinkler-code exception date: 2009-12-31 (The statutory sprinkler restriction does not apply to a code or ordinance requiring sprinklers in a residence that was adopted before December 31, 2009.)

    “In any county that has adopted zoning pursuant to this chapter, the board of supervisors may adopt and enforce, for the unincorporated areas of the county so zoned, a building code and other related codes to regulate the quality, type of material and workmanship of all aspects of construction of buildings or structures, except that the board may authorize that areas zoned rural or unclassified may be exempt from the provisions of the code adopted.”

Still unanswered

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

  • Minimum dwelling size — Minimum interior floor area or overall dwelling size for residential dwellings in unincorporated Maricopa County.
  • Tiny homes — Occupancy of tiny homes in unincorporated Maricopa County.

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 Maricopa County

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

Managed area

Groundwater is actively managed here, but a small household well is generally still available.

Household wellExempt — no permit or water right

Small non-irrigation 'exempt' wells (pump capacity 35 gpm or less) are allowed statewide, including inside Active Management Areas and INAs, but must be registered with ADWR; outside any AMA/INA groundwater is essentially rule of capture. Inside an AMA a new subdivision or large use must show an Assured Water Supply.

Limit: exempt well = pump capacity 35 gpm or less (A.R.S. §45-454)

Arizona Dept of Water Resources — Exempt Well ↗
  • Phoenix Active Management Areamajority of county

    New subdivisions and large groundwater uses must demonstrate an Assured Water Supply and obtain ADWR authorization; small domestic exempt wells (≤35 gpm) still allowed but must be registered.

    Arizona Dept of Water Resources — AMA Overview ↗
  • Harquahala Irrigation Non-Expansion Arealocalized of county

    Irrigation of new acreage is prohibited; no AMA-style Assured Water Supply requirement; domestic exempt wells (≤35 gpm) still allowed.

    Arizona Dept of Water Resources — Harquahala INA ↗

Prior-appropriation state (first in time, first in right). Groundwater rules change and basin boundaries follow the aquifer, not the county line — confirm current well and appropriation rules with the Arizona state water agency before you buy or drill.Groundwater governance as of Jul 2026, cited to each administering agency.

Living off-grid in Maricopa County, Arizona

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

Maricopa County scores 21/100 on the Bolthole Index, a weak county profile. Its strengths: manageable long-term carry cost and a stronger property-autonomy legal backdrop. Watch-outs: about 515,620 people within 15 miles and weak self-sufficiency basics: only 8.6″ of rain a year, in severe drought 30.4% of years.

Do you need a building permit in Maricopa County, Arizona?

Maricopa County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Maricopa County Environmental Services Department (ADEQ-delegated). 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 Maricopa County?

Living in an RV on your own land in Maricopa County is limited to specific cases: Occupancy of mobile homes, travel trailers, camping trailers, truck campers, and motor homes for living, sleeping, or housekeeping purposes in unincorporated Maricopa County. The MCZO generally prohibits occupancy for living, sleeping, or housekeeping purposes. Mobile homes and travel trailers intended for temporary housing require a Temporary Use Permit. Confirm with the county before relying on it.

How much does land cost in Maricopa County, Arizona?

Land in Maricopa County runs about $7,203 per acre, based on the latest county data.

What is the water situation in Maricopa County?

Maricopa County gets about 8.6" of rain a year, with severe drought in roughly 30.4% of years. On water rights, Maricopa County lies in the Phoenix Active Management Area — New subdivisions and large groundwater uses must demonstrate an Assured Water Supply and obtain ADWR authorization; small domestic exempt wells (≤35 gpm) still allowed but must be registered..

How remote is Maricopa County?

A typical private-land location has about 515,620 people within 15 miles and 6,354,954 within 100 miles. These radius catchments are the published fallback where road routing is unavailable.

How Maricopa compares in Arizona

Compare side-by-side →See all 15 Arizona counties ranked →