Madison County, AL Accessory Structures: Tiny Homes (2026)
Tiny home rules in Madison County, AL, covering tiny houses on wheels (THOWs), park model RVs, and tiny home on foundation builds, determine where they are legal and how they get permitted.
Key Facts
- True Tiny House
- 2018 IRC, Appendix Q
- Size Cutoff
- 400 square feet or less
- On Wheels
- Not habitable, no occupancy
- Septic
- ADPH r. 420-3-1 off sewer
Summary
A tiny house in unincorporated Madison County is a real dwelling only if it is built and inspected to the 2018 IRC, using Appendix Q for homes 400 square feet or less. A park-model RV or shed on wheels is not fit for habitation.
A true to code Tiny House is a building built in compliance with the 2018 International Code Council International Residential Code and employees the exceptions of Appendix Q which applies to houses that are 400 Square Feet in area or less.
Full Breakdown
Madison County defines a true tiny house as a building permitted, built onsite to the 2018 International Residential Code, and inspected by the Building Inspections Department; Appendix Q relaxes stair, headroom, loft, and escape-opening rules for homes 400 square feet or less. Anything larger cannot use Appendix Q without the building official's approval. A park-model RV, a converted shed or shipping container, or any structure on wheels does not meet the code for permanent habitation, and the county grants no occupancy without an engineer's conversion and full permits. Septic rules under r. 420-3-1 still apply off sewer.
Violations & Fines
Placing a tiny house without a building permit is illegal construction. Living in a park-model RV, converted shed, or structure on wheels is prohibited; the county grants no occupancy for it.
Frequently Asked Questions
Can I live in a tiny house in Madison County?
Can I live in a tiny house on wheels?
Sources & Official References
Other rules in Madison County
Compare Madison County to another location·View the Alabama accessory structures overview
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