Can a Park Model Tiny Home Be an ADU?

The short answer: it depends on where

Park model tiny homes are built to RV standards (ANSI A119.5). Most zoning codes were written for residential construction standards. The gap between those two frameworks is where ADU eligibility lives - and whether a park model qualifies as an ADU depends almost entirely on your specific jurisdiction.

Some areas have figured this out and created clear paths for park model ADUs. Others have not.

Where it works: green light jurisdictions

Parts of California, Idaho and Arizona have created workable permitting pathways for park model ADUs. Hailey and Blaine County in Idaho are examples we know well - they allow certified park models on lots with an existing primary home, with specific certification and cold-climate building requirements.

In these jurisdictions, the process exists. It requires documentation, permits and meeting specific standards - but it is doable, and we have guided buyers through it.

Where it does not work: red flag situations

HOA-controlled neighborhoods often prohibit anything that does not look like a conventional house - regardless of certification or code compliance. Cold-weather municipalities with RV bans may exclude park models regardless of their construction quality. Some cities require full residential code compliance, which RV-standard homes cannot meet.

Finding out about these restrictions before you buy is critical. Finding out after delivery is expensive.

The key questions to ask your planning department

Is a park model home (ANSI A119.5 / RVIA certified) allowed as an ADU on this parcel? What foundation requirements apply? Is RVIA or NOAH certification accepted? What are the setback and size requirements? Are there rental restrictions for ADUs?

Take notes, get answers in writing if possible, and bring what you learn to us before you commit to a purchase. We can help you interpret what the answers mean for your specific situation.

Common upgrades that help ADU approval

Even in friendly jurisdictions, ADU approvals often require specific upgrades beyond the base home. Better insulation, snow-load rated roofing, proper skirting, wind tie-downs, egress windows and smoke/CO detector compliance are common requirements.

Our homes support these upgrades. If you have researched your jurisdiction and are ready to move forward, schedule a consultation and we will build the ADU checklist into your order.

Related reading: Why Women Choose Tiny Home ADUs.