Tiny home rules in New Castle County, DE — 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.
New Castle County treats foundation-built tiny homes as dwellings meeting IRC Appendix Q (minimum 120 sq ft habitable). Tiny homes on wheels are classified as RVs, not permitted as primary dwellings outside RV parks.
New Castle County applies the 2018 IRC with Appendix Q (Tiny Houses) to tiny homes built on permanent foundations. Appendix Q permits dwellings under 400 sq ft with relaxed ceiling height (6 ft 8 in main area, 6 ft 4 in bathrooms), ladder access to lofts (with required tread width and handrail), and minimum 70 sq ft habitable room size. Minimum dwelling size per UDC zoning still applies and varies by district — NC5 zones typically require 600 to 800 sq ft. Tiny homes on wheels (THOW) are regulated as recreational vehicles under Delaware Title 21 and cannot be used as permanent dwellings outside of licensed manufactured home communities or RV parks. ADU provisions under UDC 40.03.510 provide a pathway for accessory dwellings on existing lots: maximum 800 sq ft, owner-occupancy requirement, and standard permits apply. Full utility connections (water, sewer/septic, electrical) are required for dwellings.
Occupying THOW as primary dwelling on residential lot: Notice of Violation, required vacate, $200 to $1,000 civil penalty. Unpermitted tiny home construction: stop-work, retroactive permitting or removal. Zoning violations: variance needed or relocation.
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See how New Castle County's tiny homes rules stack up against other locations.
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