Cool Roof Requirements: Glendale vs Mesa
How do cool roof requirements rules compare between Glendale, AZ and Mesa, AZ?
Glendale has fewer restrictions than Mesa.
Glendale, AZ
Maricopa County
Arizona has no statewide energy code, and Maricopa County has not adopted a cool-roof ordinance for unincorporated areas. The county follows the 2018 International Residential Code with limited energy provisions, leaving roof-reflectance choices to the property owner.
View full Glendale rules →Mesa, AZ
Maricopa County
Mesa enforces the Arizona-adopted International Energy Conservation Code, which encourages reflective roofing in low-slope commercial construction. Climate zone 2B applies, prioritizing summer cooling load reduction over winter heat retention.
View full Mesa rules →Key Facts Comparison
| Fact | Glendale | Mesa |
|---|---|---|
| Cool-roof mandate | None in unincorporated | - |
| Building code | 2018 IRC adopted | - |
| IECC | Not adopted | - |
| State energy code | None | - |
| Code basis | - | IECC Climate Zone 2B |
| Reflectance | - | 0.65 initial typical |
| Scope | - | Commercial low-slope new |
| Rebate partner | - | SRP, Mesa Utilities |
Highlighted rows indicate differences between cities.
Glendale FAQ
Will Maricopa County require a cool roof on a new home?
No. The 2018 IRC adopted by the county does not include cool-roof reflectance minimums, and the county skipped IECC adoption. Builders may install standard composition shingles without solar reflectance documentation.
Are there incentives for cool roofs in unincorporated areas?
APS and SRP offer rebates for ENERGY STAR roofing, and federal Inflation Reduction Act 25C credits cover qualifying products. Maricopa County does not provide a separate cool-roof grant or expedited permit.
Mesa FAQ
Do I need a white roof on my house?
No. Residential roofs are not required to be reflective. Cool roof rules apply to new commercial low-slope construction; homeowners may qualify for utility rebates voluntarily.
What climate zone is Mesa?
Mesa is IECC climate zone 2B (hot-dry), which prioritizes cooling load reduction. This drives the higher reflectance thresholds compared to colder northern Arizona.
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