Grant County, WA Accessory Structures: Tiny Homes (2026)
Tiny home rules in Grant County, WA, 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.
Key Facts
- Tiny homes as ADUs
- expressly allowed
- Also allowed
- manufactured homes, Park Model RVs
- Must meet
- all GCC building provisions
- ADU limits apply
- yes, same as other ADUs
- Citation fine
- $500 per occurrence
Summary
In unincorporated Grant County, tiny homes are expressly allowed as accessory dwelling units alongside manufactured homes and Park Model RVs, provided the structure meets all applicable building code provisions, under Unified Development Code Section 23.08.020(c)(7).
(7)Construction: Structures shall be subject to all applicable building and constructions provisions of the GCC. Manufactured Homes, Tiny Homes, Park Model RVs, and other Factory-Assembled Structures are allowed to be used as accessory dwelling units.
Full Breakdown
' The same sentence subjects every one of those structure types, tiny homes included, to all applicable building and construction provisions of the Grant County Code, meaning a tiny home used as an ADU cannot skip standard building permit review the way a recreational tiny house on wheels might elsewhere. 020(c)(1)(C). 020(c)(9) if it already exists on the lot in a nonconforming location. In short, the code treats a tiny home exactly like a manufactured home for ADU purposes: permitted, but only as a permanently sited, code-compliant structure.
Violations & Fines
Placing a tiny home ADU without the required Grant County building permit, or without meeting the applicable construction provisions, is a Title 23 violation and public nuisance under GCC Section 1.32.040(a), enforced by Development Services. Enforcement runs through the standard track: a warning notice, then a citation carrying a $500 fine per occurrence under Section 1.32.140, with a stop work order available under Section 1.32.230 to halt placement or construction immediately.
Frequently Asked Questions
Can I put a tiny home on my property as an ADU in unincorporated Grant County?
Does a tiny home ADU need a building permit like a stick-built ADU?
Can I rent out a tiny home ADU as a short-term vacation rental?
Sources & Official References
Other rules in Grant County
Compare Grant County to another location·View the Washington accessory structures overview
See something wrong?
Help us keep this page accurate. If you notice an error or outdated information, let us know.