Tiny homes in Idaho Falls, Idaho — ADU rules under Title 11 zoning, THOW and RV park limits, builder costs, and what to know before buying or building.
Last researched June 2026
Idaho Falls trades the Treasure Valley's bustle for the wide Snake River Plain, with the river's falls and a five-mile Greenbelt path running straight through downtown's numbered-street historic core. Winters are genuinely cold — sub-zero snaps arrive most Januaries, so a THOW here needs four-season insulation, heat tape, and skirting — but summers are dry and mild, and the location is the real draw: Swan Valley and the South Fork's blue-ribbon fly fishing are 45 minutes east, Grand Teton roughly two hours, and Yellowstone under two and a half. The Idaho National Laboratory anchors a steady professional job base, and housing costs run well below Boise's. For tiny home owners the practical play is a foundation ADU in town or a site out toward Swan Valley.
Idaho Falls is stricter with tiny homes on wheels than the Treasure Valley cities. A THOW is a recreational vehicle under Idaho law, and Idaho Falls prohibits full-time RV living anywhere except an RV park, resort, or campground — including on your own residential lot. Dwelling units on wheels are limited to RV parks or the city's Residential Mobile Home (RMH) zone, and unlike Boise, Idaho Falls expressly does not allow an RV or park-model unit to serve as an accessory dwelling (as of June 2026). Foundation-built tiny homes are reviewed as ordinary dwellings under the city's comprehensive zoning ordinance at Title 11, Chapter 3 of the city code.
The backyard path is a foundation-built ADU. In March 2022 the City Council passed an ordinance opening ADUs across residential zones — including RP and R1 in the low-density category and RMH in the medium-density category — defining an ADU as a free-standing structure of not more than 750 square feet, requiring the property owner to live on site, and adding one dedicated parking space beyond the principal dwelling's minimum (per the Idaho Falls Post Register, March 2022).
Idaho SB 1354 (signed March 31, 2026, effective July 1, 2026) will override the city's owner-occupancy requirement for cities over 10,000 people, with local codes due to conform by February 1, 2027. Verify current requirements with your local planning department before purchasing land or beginning construction.
Verify current requirements with your local planning department.
Idaho Falls legalized ADUs citywide in a March 2022 ordinance: a detached ADU may be a free-standing backyard structure of up to 750 square feet, allowed in residential zones including RP, R1, and RMH, with an owner-occupancy requirement and one additional on-site parking space (per the Idaho Falls Post Register, March 2022). RVs and park-model units cannot serve as ADUs — the unit must be a code-built structure on a foundation (as of June 2026). Idaho SB 1354, effective July 1, 2026, eliminates owner-occupancy mandates for ADUs in cities over 10,000 people, including Idaho Falls, with local codes due to conform by February 1, 2027. HOA covenants recorded against a property are not overridden.
Communities, RV parks, and parking options in and near Idaho Falls.
Within city limits the rule is unambiguous as of June 2026: a THOW may not be lived in full-time outside an RV park, resort, or campground — not even parked on your own property — and units on wheels are otherwise confined to the Residential Mobile Home (RMH) zone. Plan on commercial parks or land outside the city for long-term siting. The closest confirmed tiny-home-friendly option is Valley Village Tiny Home and RV Park in Irwin, in the Swan Valley about 45 minutes southeast of Idaho Falls, which combines an RV park with tiny-home sites and short-term rentals (per public reporting, last confirmed June 2026). Rural Bonneville County parcels outside city zoning offer more latitude, but county placement rules and septic/well permitting still apply — confirm with Bonneville County Planning & Zoning before buying land. Snake River Tiny Homes, an RVIA/NOAH-certified builder featured on AARP's "Going Tiny," sells THOWs and park models from its eastern Idaho base, though its units still face the same siting limits inside Idaho Falls.
rv-park
Irwin, ID (Swan Valley, ~45 min southeast of Idaho Falls)
Combined RV park and tiny-home community in the Swan Valley known for welcoming tiny homes on wheels for legal, affordable siting, with short-term rental cabins alongside (per public reporting, last confirmed June 2026).
Battle Ground, washington
Battle Ground factory builder producing modular tiny homes, ADUs, and single-family homes. Over 500 homes placed in five years. New 21,000 sq ft factory doubles production capacity to two homes per week.
Service areas: washington, oregon, california, montana, idaho
Boise, Idaho
Custom stick-built ADU and tiny home builder serving the Treasure Valley (Boise area), constructing all units on-site to avoid delivery and craning costs. Founded by Robert Perkins, who brings extensive residential construction experience to every project.
Service areas: Idaho, Treasure Valley
Spokane, Washington
Spokane franchisee of Anchored Tiny Homes, the only national ADU franchise, opened in 2024 by local entrepreneur Matt Goodwin. Builds stick-framed detached and attached ADUs ranging from 240 to 1,200 sq ft across the Inland Northwest. As of May 2026, pricing runs $90,000–$200,000 depending on size and finishes.
Service areas: Washington, Idaho
Hailey, Idaho
NOAH-certified tiny home builder in Hailey, Idaho, specializing in high-performance modular homes designed for mountain living. Builds tiny houses on wheels, backyard ADUs, and smaller foundation homes meeting ANSI building standards.
Service areas: Idaho
Spokane, Washington
Spokane-based custom ADU builder co-founded by Rob Wuls. Designs and constructs accessory dwelling units on-site in the Spokane and North Idaho region, handling permits, design, and build from start to finish. As of May 2026, units range from 300–1,000 sq ft and pricing from $115,000 into the low $200,000s.
Service areas: Washington, Idaho
Spirit Lake, Idaho
THIA-certified tiny home and general contractor in Spirit Lake, North Idaho, building compact dwellings of 100–400 sq ft following IRC Appendix Q standards. BBB Accredited since 2018 with a 4.9-star HomeAdvisor rating.
Service areas: Idaho, North Idaho
A comparison between tiny-home living and conventional homeownership in Idaho Falls.
Tiny home path
Traditional home path
Potential monthly savings
$1,400–$1,900/mo
Source: Zillow and Zumper Idaho Falls market data, spring 2026
Verified links for planning, permitting, and community connections in Idaho Falls.
Official
Community
Directory
No. As of June 2026, Idaho Falls prohibits full-time RV living anywhere except an RV park, resort, or campground — including on your own lot — and dwellings on wheels are otherwise limited to the Residential Mobile Home (RMH) zone. The city also does not allow RVs or park models as ADUs.
Yes. A foundation-built detached ADU of up to 750 square feet is allowed in residential zones under the March 2022 ordinance, with owner-occupancy and one extra parking space required (per the Post Register, March 2022). The owner-occupancy mandate ends when Idaho SB 1354 takes effect July 1, 2026.
Eastern Idaho's Snake River Tiny Homes publishes models starting under $90,000, and Idaho builders statewide ran roughly $30,000–$110,000 in 2026 depending on size and certification (per builder-published pricing as of June 2026).
Valley Village Tiny Home and RV Park in Irwin, about 45 minutes southeast in the Swan Valley, is the closest confirmed tiny-home-friendly park as of June 2026. No dedicated tiny-home village has been confirmed inside Idaho Falls itself.
The comprehensive zoning ordinance at Title 11, Chapter 3 of the Idaho Falls city code. ADUs were opened across residential zones (RP, R1, RMH) by the March 2022 ordinance; units on wheels remain restricted to RV parks and the RMH zone (as of June 2026).
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