ADU Design in Mount Vernon, AL

ADU Design in Alabama: what governs your project

Alabama has no statewide ADU statute; ADU rules are set city by city through local zoning ordinances. Some cities permit accessory units in residential zones while others restrict or prohibit them, so feasibility depends entirely on the local jurisdiction.

Energy code

Permitting typically runs through the local building department with site plan review, setback and height compliance, and standard building permits. Impact and utility tap fees vary by city; owner-occupancy rules and size caps differ widely across jurisdictions.

Permitting & plan check

Plan review and building permits are handled by city and county building departments, each enforcing the codes it has adopted. Larger cities such as Birmingham, Huntsville, and Mobile run full electronic plan-review programs, while smaller jurisdictions may review on paper with longer cycles.

Good to know

• The Gulf Coast, including Mobile and Baldwin counties, sits in one of the highest hurricane wind-speed regions of the Gulf states.
• Much of Alabama's geology is underlain by limestone, making karst and sinkhole investigation a routine part of geotechnical work in the northern half of the state.
• Alabama's state building code framework leaves adoption and enforcement to local jurisdictions, so requirements vary by city and county.

Every discipline, one team