Davidson County, TN Accessory Structures: Tiny Homes (2026)

Metro Nashville permits foundation-built tiny homes under two paths. Path 1: IRC Appendix Q (adopted by Metro) allows dwellings 400 sq ft or less with relaxed ceiling height, stair, and loft requirements. Path 2: Detached Accessory Dwelling Unit (DADU) per Metro Zoning §17.16.250, allowed by right in most residential zones as an accessory to the primary dwelling, with maximum floor area generally the lesser of 700 sq ft or 25% of the primary dwelling, and height capped at 16-25 feet depending on base district. Owner-occupancy was required for DADUs but the requirement was modified by Metro ordinance in recent cycles; confirm current rules. Tiny homes on wheels (THOW) are classified as RVs under Metro Zoning and cannot be used as permanent dwellings in residential zones; they may be stored on private property subject to RV parking rules in §17.16.210 (screened, not in front yard). Utility connections, septic/sewer, water, and a permanent foundation are required for dwelling certification. Historic overlays and specific plan districts may impose additional restrictions.