Alabama Building Codes

Important: Alabama is the national leader in Fortified Home adoption. The Institute for Business & Home Safety (IBHS) Fortified program has three tiers: Roof, Silver, and Gold. The Fortified Roof designation requires sealed roof deck (peel-and-stick or equivalent), enhanced roof-to-wall connections (hurricane clips or straps), and drip edge secured to code. Many Alabama insurers offer 25-50% wind/hail premium discounts for Fortified designation. The Alabama Department of Insurance actively promotes the program. Effective July 2022, AL requires insurers to offer premium discounts for Fortified homes.

Important: Alabama is one of the few states without a mandatory statewide residential building code. The Alabama Building Commission (ABC) oversees commercial code (2021 IBC) but residential construction is governed entirely at the local level. Major cities like Birmingham, Huntsville, Mobile, and Montgomery have adopted versions of the IRC, but many rural counties have no adopted residential code. Contractors must verify with the local building department whether codes are adopted and which edition is in effect. Even in areas without adopted codes, insurance carriers and lenders may require code-compliant construction.

Important: IRC Section R105 establishes when building permits are required. Roof replacement (re-roofing) generally requires a building permit in jurisdictions that enforce the IRC or an equivalent building code. Alabama uses municipal adoption, meaning each city/county decides whether to adopt and enforce building codes. Larger municipalities and county governments typically require permits. Rural unincorporated areas may have no code enforcement. Always verify with the local building department before starting work. IRC R105.2 exempts ordinary maintenance (minor repairs, re-attachment of trim), but full roof replacement is NOT exempt from permit requirements.