Tiny homes in San Francisco, California — zoning rules, THOW parking, builder costs, and what you need to know before buying.
Last researched April 2026
San Francisco, California offers unique opportunities for tiny home living. With a population of 873,965, the city provides a mix of urban convenience and community charm for those looking to downsize. Explore zoning rules, find local builders, and discover parking options below.
San Francisco is one of the more restrictive California cities for tiny homes. The city's Planning Code requires a minimum room size of 70 square feet and imposes minimum ADU sizes of 220 square feet with 7.5-foot ceiling heights, effectively excluding most THOW formats. Unlike Los Angeles and Fresno, San Francisco has not adopted an explicit "movable tiny house" or THOW-as-ADU ordinance. THOWs are not recognized as legal dwelling units within San Francisco city limits as of April 2026; specific ordinance details were not confirmed beyond this general restriction.
Foundation-built ADUs represent the primary tiny home pathway in San Francisco. The city updated its ADU program significantly in 2025: approval became ministerial (eliminating neighborhood notification requirements under Planning Code Section 311); starting May 1, 2025, ADUs can be sold as separately deeded condominiums under AB 1033; and beginning January 1, 2025, the city was required to offer pre-approved ADU plans. Single-family lots with four or fewer existing dwelling units may add one ADU; multi-family properties may add one ADU for every four existing residential units. ADUs must include private open space, adequate natural light and ventilation, and fire safety egress compliance.
The Family Zoning Plan, signed into law by Mayor Lurie on December 12, 2025 (effective January 12, 2026), removes restrictive zoning barriers in western and northern San Francisco neighborhoods, creating capacity for up to 36,200 additional units citywide. This may expand ADU and small-unit opportunities over time. Verify current requirements with your local planning department before purchasing land or beginning construction.
Verify current requirements with your local planning department.
Communities, RV parks, and parking options in and near San Francisco.
Within San Francisco city limits, THOWs (tiny homes on wheels) are not recognized as legal dwelling units under current zoning and lack an explicit permit pathway as of April 2026. Placing a THOW on private residential property as a full-time dwelling is not currently authorized. Those seeking a legally compliant tiny-home lifestyle in San Francisco should focus on foundation-built ADUs or explore options outside city limits. For THOW parking and RV-based residency, Treasure Island Mobile Home & RV Park is located on Treasure Island in San Francisco Bay and offers RV spaces. Candlestick RV Park in the city's southeast industrial area has increasingly housed long-term residents, with spaces starting around $2,500 per month including water, electricity, and sewer hookups. San Francisco also launched a pilot program in late 2025 to fund landlords who house RV residents, reflecting the city's awareness of vehicle-based housing. Delta Bay (in Isleton, approximately 50 miles northeast, in the California Delta) is the nearest confirmed legal tiny home community allowing permanent THOW residency in Northern California. Call individual parks to confirm current availability and full-time residency policies.
Fresno, California
Fresno-based family-owned builder with over a decade of experience and 100+ tiny homes built. Offers custom THOWs, shells, and a DIY Beta Program. Active in California tiny home legislation and partners with high school CTE programs through their Tiny_edu nonprofit. THIA member.
Service areas: California
Bend, Oregon
Bend-based builder specializing in permitted foundation tiny homes engineered for high-altitude and mountain climate conditions. IBC compliant builds with full permit packages.
Service areas: Oregon, Washington, California
Cottonwood, California
RVIA and PWA certified builder operating from a 24,000 sq ft facility in Cottonwood. Minority woman-owned, state-licensed RV manufacturer with NHTSA compliance and VIN stamping. Offers in-stock models and custom builds with nationwide shipping. THIA commercial member.
Service areas: California, Nationwide
Buckley, Washington
Buckley-based builder and one of Washington's first to embrace L&I factory inspection. Builds ANSI 119.5 certified THOWs, park models, and modular tiny homes. CEO Todd McKellips also serves as executive director of the Washington Tiny House Association.
Service areas: Washington, Oregon, California
Portland, Oregon
Portland-based luxury tiny home builder featured on national television. Family-owned company offering fully custom THOWs, park models, ADUs, and commercial builds. Signature Series starts at $129,900. Builds designed for Oregon's climate with moisture resistance and thermal insulation.
Service areas: Oregon, Washington, California
Eugene, Oregon
Eugene-based luxury tiny home builder with over 300 handcrafted homes delivered. Family-owned company with PHIUS and LEED backgrounds emphasizing sustainable building practices. Offers both signature models and fully custom builds with financing starting at $697/month.
Service areas: Oregon, Washington, California
A comparison between tiny-home living and conventional homeownership in San Francisco.
Builder cost range
Average tiny home builder costs in the San Francisco area. Actual prices vary by size, materials, and customization.
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