Can you build an ADU in Mesa, AZ?
Mesa expressly allows ADUs on any lot where a single residence is allowed across a broad range of districts, and no extra parking is required for the ADU itself. Building permit compliance still applies, and parcel-specific overlay or dimensional issues should be checked.
Confidence: high · Last researched May 2026
ADU rules
Mesa allows ADUs on any lot where a single residence is allowed, including AG, RS, RSL, RM, DR, MX, NC, LC, and GC.
- Any property with an existing single residence is permitted to have one attached and one detached ADU
- An additional detached ADU is permitted on lots that are over an acre in size if at least one ADU on the property is a restricted-affordable dwelling unit
- Maximum size is 1,000 square feet or 75% of the habitable floor area of the primary dwelling unit, whichever is less
- ADU must be set back at least five (5) feet from side and rear property lines
- Front and street side setbacks must comply with the underlying zoning district
- Attached or detached ADU must comply with the height requirements for the underlying zoning district
- No additional parking is required for an ADU, but the property must still maintain at least two parking spaces for the primary residence
- Manufactured homes, recreational vehicles, and trailers cannot be used as an ADU
Dimensional standards in Mesa, AZ
| ADU on qualifying lots — minimum side setback | five (5) feet |
| ADU on qualifying lots — minimum rear setback | five (5) feet |
| RS single-family checklist — minimum forward-facing garage setback behind primary wall | at least three (3) feet |
Related questions
Are ADUs allowed in Mesa, AZ?
Mesa allows ADUs on any lot where a single residence is allowed, including AG, RS, RSL, RM, DR, MX, NC, LC, and GC.
Full investor analysis
You've seen the general rule. The full Mesa, AZ report shows which districts allow ADUs by-right vs. by special permit, the approval path and timeline, and the overlay/flood constraints that quietly kill ADU projects here. First town report is free.
Get the full Mesa, AZ report free →More about Mesa, AZ zoning
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This summary is AI-generated from public municipal sources and is not legal, engineering, or land-use advice. Always verify zoning with Mesa, AZ officials before making decisions.
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