What are the tiny house laws in Alabama?

Your foundation tiny house in Alabama needs to meet the building code that applies at your address¹. Alabama county commissions can adopt building codes for unincorporated land¹. A city's building authority can also cover a police jurisdiction outside city limits, under conditions set by law¹. Ask which local office reviews your plans before you pay for a design.

Alabama's Division of Construction Management has no authority over ordinary residential property⁷. Beginning January 1, 2027, residential home builders must follow the applicable state or local residential building code⁴. Local jurisdictions with residential building permit and inspection programs enforce Alabama's residential-code framework⁴. Ask the Home Builders Licensure Board how that change affects your construction schedule.

An Alabama park model is temporary living quarters, not a permanent dwelling³. The Alabama Manufactured Housing Commission's rule covers recreational park trailers with a gross trailer area of 400 square feet or less³. That area is measured on the exterior in setup mode, excluding roofing overhang³.

Outside an RV park, you must install a park model according to the manufacturer's approved instructions³. Alabama's park-model rule does not give ordinary travel trailers or motor homes blanket approval for permanent occupancy on private land³. Before you order a home on wheels, ask the Commission how that model is classified. Give the local building and zoning offices that classification when you ask about using it as a residence.

A statewide minimum floor area for an ordinary Alabama house remains unconfirmed. Ask the local building office to review your proposed home's size, layout and intended use. Alabama's residential-code framework preserves local residential codes in effect on January 1, 2027⁴.

The 320-square-foot figure in Alabama's manufactured-home definition sets a classification threshold, not a minimum size for every house⁸. The definition also includes alternative dimensions measured in traveling mode and criteria for a permanent chassis⁸. You can use a qualifying manufactured home as a residence with the required utilities connected⁸. You still need separate answers about local siting, zoning, septic and installation⁸. Ask the seller for the home's classification and HUD seal information before you treat a small factory-built unit as an approved residence².

Your Alabama tiny home needs an approved wastewater arrangement if it is off public sanitary sewer⁹. You must get the local health department's permit before you install a new onsite sewage system⁵. You can begin building that system only after the Permit to Install is issued⁵.

ADPH coordinates Alabama's onsite program through local county health departments¹⁰. Those departments review site and soil information, issue septic permits and arrange inspections¹⁰. Depending on soil conditions, you may need a registered professional for testing and design⁵. Before you buy land, ask the local health department about the site evaluation, design requirements and current septic fees. Start by asking the sewer authority whether public service is available to your parcel⁹.

You can use Alabama's owner-builder licensing exemption if you act as your own contractor and provide all material supervision⁶. You must build the residence for your own occupancy or use and must not offer it for sale⁶. If you hire someone to supervise construction, you are not acting as your own contractor under this exemption⁶.

You cannot transfer Alabama's owner-builder exemption to someone else⁶. Offering the home for sale within a year after substantial completion is presumptive evidence that you built it for sale⁶. Ask the Home Builders Licensure Board about the exemption before you choose who will manage the work. Give the local building office your proposed floor plan and construction method. Ask the local health department about wastewater approval before you commit to the site.