Boxabl Is Now Approved in Texas: What HB 1779, SB 673 & State-Level Approval Mean for Your Project (2026)

Boxabl Just Got the Green Light in Texas

On May 26, 2026, Boxabl Inc. officially announced state-level regulatory approval to sell and deploy the Casita Studio across the entire state of Texas. This is a milestone for anyone who has been waiting to install a Boxabl in the Lone Star State — and it opens the door to one of the fastest-growing residential markets in North America.

But approval does not mean plug-and-play. You still need a site-specific foundation engineered for your lot, a permit from your local jurisdiction, and a clear understanding of what the new Texas ADU legislation actually changes. This article breaks all of that down.

What the Texas Approval Actually Means

State-level approval means that the Boxabl Casita Studio has cleared the regulatory requirements to be legally sold and deployed as a dwelling in Texas. This is separate from local permitting — you still need a building permit from your city or county — but it eliminates the question of whether the product itself is authorized for use in the state.

This matters because some states (most notably Florida) require additional state-level certification for factory-built, closed-construction dwellings before local jurisdictions will accept them. Texas has now confirmed that Boxabl meets the state's requirements, so local building departments should not have a basis to reject the product on state-level grounds.

The New ADU Legislation: HB 1779 and SB 673

The timing of Boxabl's Texas approval coincides with a historic shift in housing policy. Texas recently passed two landmark pieces of legislation that directly benefit Boxabl owners:

HB 1779 prohibits municipalities from imposing restrictive minimum lot sizes that would effectively prevent homeowners from adding an accessory dwelling unit to their property. Before this legislation, many cities could use minimum lot size requirements to make ADUs impractical even where zoning technically allowed them.

SB 673 eliminates local owner-occupancy requirements for ADU properties. Previously, some Texas cities required the homeowner to live on the property as a condition of having an ADU — which killed the investment case for many buyers. That restriction is now off the table statewide.

Together, these two bills make Texas one of the most ADU-friendly states in the country.

Why Texas Is the Biggest Growth Market

The numbers tell the story. Texas, along with California and Washington, now accounts for more than 62% of all national ADU permits. Texas alone is seeing a 34% year-over-year surge in construction approvals in urban hubs like Austin and Dallas.

Population growth is the engine. Texas added more residents than any other state last year, and housing supply has not kept pace. Boxabl's factory-built model — a complete dwelling delivered on a flatbed and unfolded in under an hour — is precisely the kind of product the market needs.

Foundation Engineering Considerations for Texas

Getting state approval and favorable legislation is the first hurdle. The second is engineering a foundation that works for your specific lot. Texas has some of the most variable soil conditions in the country, and what works in Houston will not work in Austin or the Panhandle.

Expansive Clay Soils (North Texas, Dallas-Fort Worth)

The black clay soils across North Texas expand dramatically when wet and shrink when dry. This seasonal movement can heave slab foundations and crack stem walls if the foundation is not properly designed. For Boxabl installations on expansive clay, foundation options typically include post-tensioned slab-on-grade or drilled pier foundations with grade beams that span between piers.

A geotechnical investigation (soil borings) is essential in these areas. The geotech report will specify the Plasticity Index (PI) of the soil, the potential vertical rise (PVR), and the recommended foundation depth. Engineering fees for expansive soil design are typically $1,500 - $2,500 per unit because the structural calculations are more involved than a standard slab design.

Rocky Terrain (Hill Country, Central Texas)

The Texas Hill Country from San Antonio through Austin and into the surrounding counties sits on limestone bedrock. Excavation for a traditional slab may require rock sawing or pneumatic breaking, which significantly increases construction cost. Pier foundations are often a better choice because they can be drilled into rock at specific points rather than requiring full-site excavation.

Coastal Counties (Galveston, Corpus Christi, South Padre)

The Texas Gulf Coast has its own set of requirements. The Texas Department of Insurance Windstorm Inspection Program (WPI-8) applies to the first tier of coastal counties. Any structure in these counties must receive a windstorm inspection certificate to be eligible for windstorm insurance. Foundation anchorage must demonstrate a continuous load path from the roof through the structure to the foundation.

Design wind speeds along the coast typically range from 130 to 150 mph under ASCE 7-22, with Exposure D applying to sites near the waterfront. Flood zone compliance is also required in many coastal areas.

The Right Order of Operations for a Texas Boxabl Project

Step 1: Confirm your lot is eligible. Check with your local building department to confirm your property is zoned for either a primary dwelling or an ADU (accessory dwelling unit). With HB 1779 and SB 673 now in effect, most residential lots should qualify, but deed restrictions and HOA rules can still create issues. Always verify before ordering.

Step 2: Get a site feasibility assessment. A site feasibility report evaluates zoning, setbacks, utility access, soil conditions, delivery access, and foundation type recommendation. This is the fastest way to find out if your lot is a go or a no-go.

Step 3: Order your geotechnical investigation. Especially in North Texas or coastal areas, a geotech report is required before foundation design can begin. Budget $1,500 - $3,000 depending on the location and number of borings.

Step 4: Engage a PE for foundation engineering. A licensed Professional Engineer designs the site-specific foundation, including structural calculations, anchorage details, and permit-ready drawings. View our foundation engineering packages — plans start at $749.

Step 5: Submit for permit and order your unit. With stamped plans in hand, submit to your local building department. Once the permit is issued, coordinate delivery and construction. In most Texas jurisdictions, expect a 2-4 week plan review period.

Before any of this, your first call should be to your local Authority Having Jurisdiction (AHJ) — typically the city or county building department. Confirm they are ready to accept Boxabl installations under the new state approval, and ask what documentation they need. A five-minute call can save you months.

Foundation Engineering Cost Ranges for Texas

Geotechnical investigation is separate — generally $1,500 - $3,000 per site.

Don't Have a Boxabl Yet?

If you're still in the research phase, Texas is now one of the best states to make your move. With state-level approval confirmed and ADU-friendly legislation in place, the regulatory path is clearer than it has ever been. You can order your Boxabl Casita directly from Boxabl and start planning your foundation while you wait for delivery.

Frequently Asked Questions

Is Boxabl officially approved in Texas? Yes. As of May 26, 2026, Boxabl has received state-level regulatory approval to sell and deploy the Casita Studio across the entire state of Texas.

Do I still need a local building permit? Yes. State-level approval means the product is authorized for use in Texas, but you still need a building permit from your city or county building department for the foundation and site work.

What changed with HB 1779 and SB 673? HB 1779 prohibits cities from imposing restrictive minimum lot sizes that would effectively block ADUs. SB 673 eliminates owner-occupancy requirements for ADU properties, making it easier to build a Boxabl as a rental investment.

What type of foundation do I need in Texas? It depends on your soil conditions and location. North Texas expansive clay typically requires a post-tensioned slab or pier foundation. Hill Country rock may need drilled piers. Coastal counties require windstorm-rated anchorage. A site-specific PE assessment is essential.

How much does foundation engineering cost for a Boxabl in Texas? Engineering fees range from $749 for a standard slab on stable soil up to $3,000 for coastal windstorm zones with complex soil conditions. A geotechnical investigation adds $1,500 - $3,000.

Can I put a Boxabl in my backyard in Austin or Dallas? With HB 1779 and SB 673 now in effect, most residential lots in Austin and Dallas are eligible for ADUs. However, you should still verify with your local building department and check for HOA restrictions or deed covenants that might apply.

Do I need a windstorm certificate for my Boxabl in a coastal county? If your property is in a Tier 1 coastal county covered by the Texas Department of Insurance Windstorm Inspection Program, then yes — you will need a WPI-8 inspection certificate for windstorm insurance eligibility.

Ready to Start Your Texas Boxabl Project?

Oasis Engineering provides PE-stamped foundation engineering plans for Boxabl homes across Texas. Whether you're dealing with expansive clay in Dallas, limestone in the Hill Country, or windstorm requirements on the Gulf Coast, we design the foundation to match your site. Licensed in 39 states, with plans starting at $749.

View Foundation Engineering Packages | Get a Site Feasibility Report

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Disclaimer: This article reflects information available as of May 2026, including Boxabl's announced Texas state-level approval and recently passed Texas ADU legislation (HB 1779, SB 673). Regulatory status and local ordinances can change. Always confirm current requirements with your local building department before committing to a project. This article is general information and does not constitute engineering advice on any specific project. Oasis Engineering LLC is not affiliated with BOXABL Inc.