Setback requirements in Phoenix, AZ
We haven't verified Phoenix's accessory-structure setback tables yet.
Rules last checked by a person on October 19, 2026. Guidance only; confirm with Phoenix before you build.
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Citywide placement rules
| ADU: Detached ADU setbacks | Street side 5 ft, interior line 3 ft, alley 0 ft; may sit in the required rear yard |
|---|---|
| ADU: Rear setback (interior line) | 3 ft (0 ft on a dedicated alley) |
| ADU: Attached ADU in rear yard | At least 3 ft from the rear line and 5 ft from a side line, 15 ft tall |
Sources
- Phoenix Building Construction Code 2024, Chapter 1 amendments (Sec. 105.2, effective 8/1/2025). Checked 2026-10-20.
One-story detached accessory structures used as tool and storage sheds, playhouses, non-cantilevered shade structures... floor area is not greater than... 200 square feet, except for unaltered Intermodal Shipping Containers not greater than 320 square feet.…
- 44 CFR 59.1, definition of development (NFIP). Checked 2026-10-19.
Development means any man-made change to improved or unimproved real estate, including but not limited to buildings or other structures...
- 44 CFR 60.3, floodplain management criteria. Checked 2026-10-19.
Require permits for all proposed construction or other development in the community...
- 2024 IRC R105.2, Work exempt from permit (text published by the City of Benson, AZ). Checked 2026-10-19.
One-story detached accessory structures, provided that the floor area does not exceed 200 square feet. Fences not over 7 feet high. Decks not exceeding 200 square feet in area, that are not more than 30 inches above grade at any point, are not attached to a…
- Phoenix TRT/DOC/00192, ADU Residential Process (Jan 2024). Checked 2026-10-19.
Must have site planning approval prior to moving on to residential submittal.
- City of Phoenix, Beginner's Guide to ADUs. Checked 2026-10-19.
Two ADUs are permitted per single-family detached lot... A detached ADU may be located within the required rear yard and may not exceed 15 feet in height... no closer than 5 feet to a street side property line; 3 feet from an interior property line, and 0 f…