Why the Answer Changes by City
Cities and counties write their own building rules, so a checklist from one place does not carry to the next.[1][3]
Cochise County, for example, lists exempt single-family work as one-story detached accessory structures up to 200 square feet without utilities, finish work such as painting, tiling, carpeting, cabinets and countertops, and like-for-like re-roofing.[15] Phoenix's exemption list names one-story detached accessory structures up to 200 square feet, certain fences, and painting and similar finish work.[16]
Camp Verde adds replacement of faucets, toilets and ceiling fans, plugged-in appliances, and garage-door replacement without structural changes.[17]
The pattern holds across all of them. Replacing is usually exempt, while adding, resizing or relocating is not.
Equipment Swaps: Same Unit, Same Place
Air conditioner and water heater swaps are where the wording differs most. Each city ties the exemption to a condition.
Air conditioners
- Phoenix: no permit if the replacement does not increase size and capacity or change location.[5]
- Mesa: no permit if the new unit uses the same or less electricity; changing the electrical connections needs a construction permit.[4]
- Lake Havasu City: no permit for a replacement that does not increase unit size, capacity, location or ampacity.[3]
- Glendale and Goodyear: no permit when a licensed contractor installs it (Goodyear: like for like).[1][2]
Glendale's page does not say what applies when the owner does the work. For San Tan Valley, Pinal County says a same-type, same-rating, same-location swap "may be" exempt.[6]
| City | No permit when |
|---|---|
| Phoenix | Size, capacity and location do not change |
| Mesa | Same or less electricity; no electrical connection changes |
| Lake Havasu City | Size, capacity, location and ampacity do not increase |
| Glendale | A licensed contractor installs it |
| Goodyear | Licensed contractor, like for like |
See the AC replacement permit guide for the full city list.
Water heaters
Phoenix requires a permit when a homeowner replaces an electric water heater, and none when a licensed contractor does it.[5] Yuma exempts an existing electric unit in the same location, done by a licensed contractor or the owner, but the exemption does not cover gas.[14]
Mesa needs a permit only when a storage gas heater becomes a tankless gas unit.[4] Lake Havasu City loses the exemption if the location changes, ampacity increases or the unit converts to gas.[3]
The water heater permit guide covers the rest.
Walls, Roofs and Shade Structures
Measurements decide these jobs. Get the number right before you start.
- Block walls in Phoenix: no building permit for fences or retaining walls up to 3 feet; fences up to 7 feet need a permit.[10]
- Block walls in Chandler: a permit is needed for a retaining wall over 4 feet, or a fence over 7 feet or on a retaining wall.[7]
- Block walls in Flagstaff: fences up to 7 feet and retaining walls up to 4 feet are exempt from building permits but may need a zoning permit.[8]
- Block walls in Maricopa: a zoning permit applies to any fence or wall under 7 feet or in a residential district.[9]
Maricopa's pergola rule is the clearest of its kind. No permit under 200 square feet with no electrical or plumbing, and a permit above that.[11]
Decide
Does a pergola need a permit in Maricopa?
Is it under 200 square feet with no electrical or plumbing?
If Yes
then: No permit needed
If No
then: A permit is required
Roofing varies too. Mesa exempts replacement roof coverings of equal or greater classification,[12] while Tucson requires a permit for any structural roof work, including sheathing, decking, joists or trusses.[13]
Chandler requires one when you switch to a heavier material such as concrete tile.[7]
Details are on the block wall, patio cover and re-roofing pages.
Solar in Mesa
Mesa does not require a construction permit for certified solar systems under 10,000 square feet installed by a licensed Arizona contractor. New electric meters or circuits do require one.[4]
Other cities are not confirmed, so check with the city. The solar permit guide links each city page.
No Permit Is Not the Same as No Rules
A job can skip a building permit and still need other approval.
Flagstaff and Maricopa both attach a zoning permit to fences, and Camp Verde says zoning clearance can still be required.[8][9][17] Cochise County notes that zoning, floodplain, septic or electrical approvals may still apply.[15]
Contractor licensing is a separate question.
Check with the city permit desk whether minor work qualifies for a small-job exception and skips the building permit. Read the handyman exemption rules and use the license check before you hire.
Pro tip
Ask the permit desk about zoning, floodplain, septic and electrical approvals at the same time, since a job can skip a building permit and still need them.
Keep Records Either Way
Save invoices, product details, photos and any written word from the permit office. Unpermitted work can raise questions at resale, and buyers are advised to ask for permits and records.[7]
Cities not listed here are not confirmed. Check with the city for your address, and use the permit rules table to find your city page.
The building department has the final word.
Quick answers
Can I replace an air conditioner in Phoenix without a permit?
Yes, if the replacement does not increase size and capacity or change location.
Do I need a permit for a small shed in Arizona?
Cochise County and Phoenix both exempt one-story detached accessory structures up to 200 square feet. Cochise County adds that they must have no utilities.
Does skipping a building permit mean no other approval is needed?
No. Zoning, floodplain, septic or electrical approvals may still apply.
Sources
- City of Glendale. "Glendale: building permit rules (city page)." https://www.glendaleaz.gov/Business/Building-Safety-Codes-Services/Building-Permits/Q-A. Accessed October 21, 2026.
- City of Goodyear. "Goodyear: building permit rules (city page)." https://www.goodyearaz.gov/government/departments/engineering-development-services/development-services/homeowner-permit-faqs. Accessed October 21, 2026.
- City of Lake Havasu City. "Lake Havasu City: building permit rules (city page)." https://www.lhcaz.gov/DocumentCenter/View/1204/Amendments-To-2024-Intl-Residential-Code-PDF. Accessed October 21, 2026.
- City of Mesa. "Mesa: building permit rules (city page)." https://www.mesaaz.gov/Business-Development/Development-Services/Building-Permit-Plan-Review/Residential-Construction/Residential-Construction-FAQ. Accessed October 21, 2026.
- City of Phoenix. "Phoenix: building permit rules (city page)." https://www.phoenix.gov/administration/departments/pdd/residential-building/resident-plan-reviews.html. Accessed October 21, 2026.
- Pinal County. "San Tan Valley: building permit rules (city page)." https://www.pinal.gov/DocumentCenter/View/447/003---What-Projects-and-Structures-Are-Exempt-From-Permit-Requirements-PDF. Accessed October 21, 2026.
- City of Chandler. "Chandler: building permit rules (city page)." https://www.chandleraz.gov/sites/default/files/departments/development-services/City-of-Chandler-Home-Owners-Building-Permit-Manual.pdf. Accessed October 21, 2026.
- City of Flagstaff. "Flagstaff: block wall permit." https://www.flagstaff.az.gov/DocumentCenter/View/14750/When-is-a-building-permit-needed. Accessed October 21, 2026.
- City of Maricopa. "Maricopa: block wall permit." https://www.maricopa-az.gov/files/assets/city/v/1/development-services/documents/handouts-guidelines-resources/walls-and-fences-guide.pdf. Accessed October 21, 2026.
- City of Phoenix. "Phoenix: block wall permit." https://www.phoenix.gov/content/dam/phoenix/pddsite/documents/trt/external/dsd_trt_pdf_00181.pdf. Accessed October 21, 2026.
- City of Maricopa. "Maricopa: patio cover or shade structure permit." https://www.maricopa-az.gov/Departments/Development-Services/Frequently-Asked-Questions. Accessed October 21, 2026.
- City of Mesa. "Mesa: re-roofing permit." https://www.mesaaz.gov/files/assets/public/v/2/business-development/devsvcs/guides/residential-construction-guide.pdf. Accessed October 21, 2026.
- City of Tucson. "Tucson: re-roofing permit." https://www.tucsonaz.gov/Departments/Planning-Development-Services/Permits/Tucson-Permit-Exemptions. Accessed October 21, 2026.
- City of Yuma. "Yuma: water heater replacement permit." https://www.yumaaz.gov/home/showpublisheddocument/11460/638987219183130000. Accessed October 21, 2026.
- Cochise County Development Services. "Permit Exemptions." https://www.cochise.az.gov/816/Permit-Exemptions. Accessed October 21, 2026.
- City of Phoenix Planning and Development Department. "Work Exempt from Permit." https://www.phoenix.gov/content/dam/phoenix/pddsite/documents/trt/external/dsd_trt_pdf_00618.pdf. Accessed October 21, 2026.
- Town of Camp Verde Development Services. "Permitting & FAQ's." https://www.campverde.az.gov/department/development_services/permitting.php. Accessed October 21, 2026.