Tiny home rules in Islip, NY — 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.
Tiny houses on permanent foundations must meet NY Residential Code including minimum room sizes and Appendix AQ for units under 400 sq ft. Tiny houses on wheels are considered RVs and cannot be used as permanent dwellings in Islip residential zones.
NYS adopted IRC Appendix Q in 2020, allowing tiny homes under 400 sq ft with reduced loft and stair requirements if built to code and on a foundation. Town of Islip follows this but still requires the standard single-family minimum lot size and setbacks. THOWs are subject to the same RV-storage rules and may not be occupied on a residential lot. Seasonal campground use is the only legal placement for a THOW.
Illegal tiny-home occupancy: $1,000-$5,000 and vacate order. RV-as-dwelling: code violation plus Fire Marshal referral.
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