ADU (Accessory Dwelling Unit) permit in Avondale, AZ
Yes — you need a permit for adu (accessory dwelling unit) work in Avondale.
Building an accessory dwelling unit (casita, garage apartment) requires a permit; the 200 sq ft accessory-structure exemption in R105.2 does not apply to habitable dwelling units, and zoning approval may also apply.
| Permit needed? | Yes |
|---|---|
| Where the line falls | Building an accessory dwelling unit (casita, garage apart… |
| Fee | Building permit fees are set by the Chief Building Official and kept on file in the Building Division (§4-17); development impact fees may also apply (Ch. 26); no dollar amounts are in the code. |
| Review time | Not in the ordinance |
| Code section | IRC R105.2 |
| Based on | IRC 2024 as amended |
How to pull the permit
- Put together a site plan showing where the work goes, with dimensions.
- Apply through the Avondale building department.
- Pay the permit fee when the permit is issued. Work done before that isn't covered.
- Book each inspection listed on the permit as the job reaches that stage.
Either of you can pull it. When a contractor does the work, it is normally their job.
If you skip it
Violation of the adopted codes is a Class 1 misdemeanor: fine up to $2,500 per offense and/or up to 6 months in jail; each day is a separate offense.
Nearby cities, same job
Rules stop at the city line. If your lot is near a boundary, or you work across several towns, this is where they differ.
| City | Distance | Permit? | Where the line falls |
|---|---|---|---|
| Avondale | — | Yes | Building an accessory dwelling unit (casita, garage apart… |
| Glendale | 17 mi | Yes | Building an accessory dwelling unit (garage apartment, ca… |
| Buckeye | 20 mi | Yes | Building an accessory dwelling unit (casita, garage apart… |
| Tempe | 24 mi | Yes | Building an accessory dwelling unit (garage apartment, ca… |
| Surprise | 26 mi | Yes | Building an accessory dwelling unit (casita, garage apart… |
| Chandler | 28 mi | Yes | Building an accessory dwelling unit (a casita, garage apa… |
See every Arizona city on adu (accessory dwelling unit) work
Other work in Avondale
Questions people ask
How much does a adu (accessory dwelling unit) permit cost in Avondale?
Building permit fees are set by the Chief Building Official and kept on file in the Building Division (§4-17); development impact fees may also apply (Ch. 26); no dollar amounts are in the code.. Valuation-based fees mean the number depends on what the job is worth, so the department quotes it when you apply.
I already built it without a permit. What now?
Avondale can issue a stop-work order and require you to apply after the fact, sometimes with an extra fee. Work that was covered up may have to be opened for inspection. Full walkthrough here.
Does unpermitted work cause problems when selling the house?
Often, yes. A buyer's inspector or the title company may flag it, and lenders can balk at financing a home with open or missing permits. What to do about it.