State Guide · Verified 2026
Shed Installation Permits in Alabama
The Building Code in Alabama
Alabama Building Code, IRC-based with Alabama amendments, current edition varies by source (2015 to 2021 depending on jurisdiction)
Alabama's statewide residential code is administered by the Alabama Home Builders Licensure Board, following a 2024 transfer of authority from the Department of Economic and Community Affairs. Enforcement happens entirely at the local level: cities and counties that choose to enforce building codes must use the state-adopted edition, but many rural and unincorporated areas run no active enforcement at all. The base code exempts one-story detached storage sheds under 120 square feet from a building permit, and local jurisdictions can raise, but not lower, that threshold through their own amendments.
Quick Facts
Who Sets the Rules
A young code with genuinely uneven reach
Alabama's statewide residential code is barely over a decade old, and unlike most states, adoption of the code does not guarantee enforcement. Many rural and unincorporated areas simply have no building department to enforce it, which means the 120-square-foot rule is a real ceiling only where a local government has chosen to enforce it at all.
Two real local increases on the books
Mobile County raised its shed exemption to 200 square feet through a detailed local amendment, and the City of Madison, near Huntsville, uses the same 200-square-foot figure. Birmingham, Huntsville, Montgomery, and most other Alabama cities stick with the state's 120-square-foot standard.
Utilities are the one universal trigger
Regardless of how a specific city or county treats shed size, adding electrical, plumbing, or gas connections always requires a separate trade permit anywhere in Alabama that enforces permits at all.
The Gulf Coast layers real wind requirements on top
Mobile and Baldwin counties sit in Wind Zone II, with design wind speeds of 120 to 150 mph, considerably higher than inland cities like Birmingham. Mobile and Baldwin counties increasingly also require FORTIFIED building certification, an insurance-industry hurricane-resistance standard, for qualifying construction.
A genuine owner-builder exemption exists
Under Ala. Code 34-14A-6(5), a homeowner can act as their own contractor, providing all material supervision themselves, when building or improving their own occupied one- or two-family home, without needing a state home builder license. Gas fitting remains the one trade that must go to a state-licensed Master Gas Fitter regardless.
What people get wrong
The most common mistake is assuming Alabama's statewide code means consistent enforcement. It does not: whether any rule applies at all depends first on whether the specific city or county runs an active building department, a genuinely different question from what the state code says on paper.
Counties With Their Own Rules
These Alabama counties have verified, county-specific shed installation rules that differ from the state baseline:
Check Your County
Select your county for the local rule, fees, and your building department's contact details:
Building It Yourself? Here's What You'll Need
Popular tools and materials homeowners use for a shed installation project:
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Official Sources
Rules change and cities within a county may differ. This guide is general information, not legal advice — always confirm with your local building department. Reviewed by the StateDataIndex Editorial Team · Updated September 2026.