Garage conversion rules in Mesa, AZ — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Mesa's 2025 amendments (Ordinance No. 5950) eliminated the requirement to build replacement covered parking for garage conversions to ADUs, making conversions significantly more feasible across the city.
Mesa updated its garage conversion rules through Ordinance No. 5950 (July 8, 2025), which eliminated the longstanding requirement to build replacement covered parking when converting a garage to an ADU or living space. This was identified as the primary barrier killing ADU projects in Mesa, as many lots could not accommodate new covered parking elsewhere on the property. Under the updated rules, existing structures converted to ADUs require no additional setbacks beyond the original structure's footprint. Primary residences may also be internally renovated to include an ADU without additional setback requirements. Garage conversions must still comply with all building code requirements including the 2024 ICC codes (effective January 2026) and 2023 NEC for electrical. Proper ventilation, egress windows, insulation, and fire separation may be required to convert a garage to habitable space. Plumbing connections for kitchen and bathroom facilities must meet code. HOA restrictions may still prohibit or limit garage conversions regardless of city zoning approval.
Unpermitted conversions are code violations subject to correction orders. Structures converted without proper building permits cannot be legally occupied. Fire and safety code compliance is required for habitable space conversion.
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Side-by-side rule comparisons with other cities in Maricopa County.
See how other cities in Maricopa County handle garage conversions.
See how Mesa's garage conversions rules stack up against other locations.
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