Park Model RVs And ADUs: Knowing The Real Difference
If you’re looking for the simplest and most affordable way to add a living space to your property, Park Model RVs are one of the best options available. They give you space without the heavy construction process that comes with building a traditional ADU.
Here’s why people choose them:
No foundation required
No residential building permit in many areas
Built in 8 to 12 weeks
Some units available immediately right off the lot
One of the easiest and most cost-effective ways to add extra living space, rental income, or multigenerational housing
At NW Tiny Homes, every home we sell is a Park Model RV. These are sometimes called Tiny Homes On Wheels (THOWs), but here’s the key distinction:
All Park Model RVs are THOWs, but not all THOWs are Park Model RVs.
What sets a Park Model RV apart is that it’s built to the ANSI 119.5 standard. That certification is what gives it legal RV status.
Because of this, Park Model RVs follow RV laws, not residential building codes.
And that’s why they are not ADUs.
They’re an alternative to an ADU, built under a different rulebook.
Why This Matters
A lot of homeowners assume that if ADUs are allowed in their city, then Park Model RVs must also be allowed. But cities separate these two categories.
ADUs follow residential building rules
Park Models follow occupied RV rules
Just because an ADU is permitted does not guarantee that an occupied RV is.
So before you plan anything, the most important thing to confirm is:
Does your city or county allow an occupied RV or Park Model RV on private property?
Once you know the answer, everything else becomes straightforward. We can help with sizing, placement, utilities, and next steps.
The Quickest Way To Check With Your City
Here’s a simple list of questions you can send directly to your city planner or zoning department. It’s also information you can usually find on your city’s planning website.
Questions To Ask Your City Planner or Zoning Department
Copy and paste this:
Subject: Zoning Questions for Park Model RV Placement
Hi there,
I’m considering placing a Park Model RV built to ANSI 119.5 on my property. Can you help confirm the following:
Is an occupied RV allowed on my property or in my zoning district?
Are there any restrictions on using a Park Model RV as a long-term or full-time residence?
Does the city require a specific type of RVIA certification or inspection?
Are there setback rules or placement requirements for RVs?
Is a permit required for delivery or connection of utilities?
If RV living is not allowed, does the city offer any temporary stay, seasonal use, or caretaker exemptions?
Thank you for your help.
Final Takeaway
Park Model RVs are one of the best ADU alternatives available. They’re faster, more affordable, and far simpler to place. But they fall under RV laws, not residential housing laws, which is why checking local rules for occupied RVs is the most important first step.
