Thinking about an ADU in your backyard?

Here are some things to consider​

Why RV-Style Tiny Homes Aren’t the Best Fit
A lot of people shop for small park-model RVs or “tiny homes on wheels” because they look affordable and seem easy to install. The problem is how they’re classified.
Units built to the ANSI A119.5 Park Model RV code are legally considered recreational vehicles, not houses. That means:

• They can’t be approved as a dwelling or ADU.
• They can’t be permanently connected to utilities on a residential lot.
• They’re not allowed for long-term living in most jurisdictions.
• Cities and counties often limit occupancy to short term, occasional use.

What looks like a quick solution often turns into a permitting headache.


Why HUD-Code Manufactured Homes Are the Better Option
Manufactured Homes built under the federal HUD Code (24 CFR 3280) are recognized nationwide as real dwellings. They’re factory-built, inspected, and meet structural, electrical, plumbing, and safety standards.
The HUD definition requires:

• A minimum of 320 sq ft,
• A permanent chassis,
• And construction designed for full-time residential use.

Even at smaller sizes—say 340 to 480 sq ft—a HUD-code home is considered a legitimate house, not an RV. That makes it a strong candidate for an ADU wherever manufactured homes are allowed.


A Major Advantage: Flexible Financing
Here’s where HUD-code ADUs open up opportunities that site-built casitas can’t match.
A HUD-code home can be titled as either:
• Real property - attached to the land on a permanent foundation and financed like part of the main home, or
• Personal property (chattel)—financed separately and not tied to the mortgage on the land.
That second option creates several benefits:

• You don’t have to refinance or touch the mortgage on your primary home.
• The ADU can be bought, sold, or moved later without affecting the property deed.
• You can generate rental income while keeping the ADU as a separate asset.
• Investors and homeowners avoid the long timelines and cost of site-built construction.

In short, you get a fully legal dwelling with the flexibility of a movable asset.


Why This Matters for New Mexico Homeowners
New Mexico’s mix of large lots, rural-residential zoning, and strong factory-built housing industry makes this approach especially appealing. A small HUD-code unit can serve as:

• A casita for aging parents
• A private guest suite
• A long-term rental
• A flexible investment you can sell or relocate later

And because it’s built to a federal housing standard, the path to inspections and approval is clearer than it is for RV-style units.


Final Thoughts
If you're considering an ADU in New Mexico, a small HUD-code manufactured home offers the safest and most flexible route. It meets residential standards, works with most zoning rules, and can be financed separately from your land—giving you options that site-built casitas simply can’t match.
If you need help evaluating whether a HUD-code ADU can work on your property—or you'd like to explore models in the 320–500 sq ft range—NM Home Solutions can help you compare options and walk through the permitting and placement process.
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