Foster Center, RI Accessory Structures: Tiny Homes (2026)

Rhode Island's approach to tiny homes depends on classification. Foundation-built tiny homes are treated as dwellings under the RI State Building Code (RIGL §23-27.3), which adopts IRC Appendix Q for tiny houses 400 sq ft or less — providing relaxed ceiling height, stair/ladder, and loft standards. Tiny homes on wheels (THOW) are generally classified as either recreational vehicles (RVs) or manufactured homes depending on certification. RV-classified THOW typically cannot be used as permanent dwellings in RI residential zones. Rhode Island's Accessory Dwelling Unit legislation RIGL §45-24-37(j) (2022, amended 2024) requires municipalities to permit one ADU on lots with an owner-occupied single-family dwelling, providing a statutory pathway for foundation-built tiny homes as ADUs. Municipalities retain authority over size limits (typically capped at 900 sq ft or 60% of primary dwelling, whichever is less), setbacks, and design standards, but cannot prohibit ADUs outright in residential zones. Providence, Cranston, and Pawtucket have amended zoning to comply. Local minimum dwelling size requirements still apply — Providence has no explicit minimum, while some RI towns require 500+ sq ft. Septic/sewer, water, and electrical hookups required. Historic districts (RIGL §45-24.1) impose design constraints. CRMC coastal zone rules may apply.