ADU Rules in Gilbert, Arizona
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ADU Rules in Gilbert, Arizona
Arizona's casita statute is HB 2720 (2024), codified at A.R.S. §9-461.18, applying to cities with 75,000+ population. HB 2673 is unrelated.
Permitted ADU Types
- Detached ADU: Standalone structure on the residential lot
- Attached ADU: Addition to primary dwelling with own entrance
- Garage Conversion: Converting existing garage to dwelling unit
Size Limits
| ADU Type | Maximum Size |
|---|---|
| Detached ADU | 1,000 sq ft or 50% of primary dwelling |
| Attached ADU | 50% of primary dwelling floor area |
| Garage Conversion | Existing footprint |
Setbacks
- Front: Base zone standard (typically 20–25 ft)
- Side: 5 feet minimum
- Rear: 5–10 feet minimum
Height
- Detached ADU: Maximum 18 feet
- Cannot exceed primary dwelling height
HOA Considerations
Gilbert has extensive HOA-governed neighborhoods. Under Arizona law (A.R.S. § 33-1261), HOAs can regulate ADUs to some degree even where state law limits municipal restrictions. Always:
- Review your CC&Rs and HOA governing documents
- Submit your plans to the HOA board for approval if required
- Get HOA approval in writing before starting construction
Parking
One additional off-street parking space required per ADU.
Permit Process
- HOA check: Obtain HOA approval if in an HOA community
- Verify zoning: Contact Gilbert Planning Division
- Submit plans: Architectural and site plans
- Review: Zoning and building compliance
- Building permit: Issued after approval
- Inspections: All required phases
- Certificate of Occupancy: Before occupancy
Contact
Gilbert Planning Division 50 E. Civic Center Drive, Gilbert, AZ 85296 Phone: (480) 503-6700 Website: gilbertaz.gov/planning
Disclaimer: Check your HOA restrictions and verify current requirements with the Gilbert Planning Division before starting any project.
More about Gilbert Zoning
Sources
- Gilbert Zoning Ordinance — Residential Districts·library.municode.com·Accessed 2026-04-07·Direct link
- Town of Gilbert Planning Division·gilbertaz.gov·Accessed 2026-04-07·Direct link
FAQ
Are ADUs allowed in Gilbert, Arizona?
Arizona's casita statute is HB 2720 (2024), codified at A.R.S. §9-461.18, applying to cities with 75,000+ population. HB 2673 is unrelated.
What is the maximum ADU size in Gilbert?
Detached ADUs in Gilbert are generally limited to 1,000 square feet or 50% of the primary dwelling's floor area.
Do HOAs in Gilbert restrict ADUs?
Arizona's casita statute is HB 2720 (2024), codified at A.R.S. §9-461.18, applying to cities with 75,000+ population. HB 2673 is unrelated.
Disclaimer: The information on this website is provided for general informational purposes only and does not constitute legal, financial, or professional advice. Always verify current requirements with your local planning department.