New Hampshire Tiny Homes Subject to Building Code

RSA 155-A adopts the International Residential Code as the New Hampshire State Building Code, which includes Appendix Q standards for dwellings 400 square feet or less. The state code applies uniformly, though enforcement is local. RSA 674:32 prohibits municipalities from excluding manufactured housing from all districts where similar single-family detached dwellings are allowed; HUD-code tiny homes on permanent foundations qualify as manufactured housing. Tiny homes on wheels (THOWs) are typically classified as recreational vehicles and limited by RV occupancy rules. Foundation requirements, septic approval under RSA 485-A, and zoning lot size still apply, but blanket exclusion of qualifying tiny homes is preempted.

Local ordinances excluding manufactured housing violate RSA 674:32 and are unenforceable; building code violations carry penalties under RSA 155-A:8 up to $1,000 per day.