Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
Boxabl Home Additions & ADU: The Fort Worth Owner’s Guide
A Boxabl home addition or ADU project in Fort Worth typically runs $45,000 to $130,000 for an attached addition and $90,000 to $220,000 for a detached accessory dwelling unit. We handle the full scope from foundation and utility tie-ins through framing, envelope, interior finish, and final inspection. Most owners contact us because their existing modular structure has developed envelope failures, utility connection problems, or foundation settlement issues that make the structure unsafe or uninsurable.
You bought a Boxabl because the engineering made sense. The parts still need to work with Texas soil, Texas heat, and Fort Worth building code. That’s where we come in.
Which Boxabl Models This Applies To
Boxabl builds the Casita in a few configurations. The shell itself is standard: steel framing, insulated panels, and a folding mechanism that ships flat. What changes is how the unit gets set on your site and connected to utilities. If your Casita predates 2022, you may have the older panel latch system. Newer units use the revised hinge and sealing package. The difference matters for weatherproofing and for any addition tied to the existing shell.
When we scope an addition or ADU job on a Boxabl, we’re matching the new framing to the existing steel channel dimensions. Boxabl wall panels run 20 feet by 8 feet 6 inches when unfolded. Any addition has to respect that module width or you end up with an awkward seam down the middle of a wall. We’ve seen it done wrong. The fix costs more than doing it right the first time.
On the OEM versus aftermarket question: Boxabl sells replacement panels and hardware direct, but lead times run long and shipping to Fort Worth adds cost. For most addition and ADU work, we spec aftermarket materials that meet or exceed the original specs. Steel studs, closed-cell insulation, and standing-seam metal roofing are all available locally with manufacturer warranties. Curtis Lane has been pulling permits across the Southwest for two decades, and he’ll tell you the same thing: the engineering standard matters more than the brand stamp.
Styles & brands we work with
Signs Your Boxabl Home Additions & ADU Is Failing
- Wall panel gaps at the fold seams. The original sealant breaks down after a few Texas summers. You’ll see daylight or feel drafts where the panels meet. Underlying cause: thermal expansion cycling and UV degradation of the factory sealant.
- Soft spots in the floor near the utility chase. Water follows the plumbing and electrical entry points. If the chase wasn’t flashed correctly at installation, moisture wicks into the subfloor. You’ll feel give underfoot before you see staining.
- Doors that stick in summer. Steel framing moves with temperature swings. If the door frames were fastened without enough clearance, they bind. This points to an installation issue, not a door issue.
- Condensation on interior wall panels. Fort Worth humidity plus inadequate vapor barrier equals sweating walls. The original Boxabl insulation package is decent, but the vapor management needs to be right for our climate.
- Electrical flicker when appliances cycle. The load panel and wiring connections in a Boxabl are compact. Loose connections at the bus bar or undersized feeders cause voltage drop. This is a fire hazard, not an annoyance.
See the difference
Before
After
Before
After
Before
AfterReplacement Cost & What’s Included
For Fort Worth Boxabl owners, here’s what you’re looking at:
- Attached home addition (300 to 600 sq ft): $45,000 to $130,000
- Detached ADU with kitchenette and bath: $90,000 to $220,000
- Garage conversion on a Boxabl footprint: $30,000 to $80,000
- Panel and seal replacement on an existing Casita: $8,000 to $22,000 depending on how many seams are compromised
Every number gets written before work starts. That’s The Garrison Standard at work: no numbers that move at the door, no change orders because we missed something during the walkthrough. You’ll know the scope, the materials, the labor, and the permit costs. Fort Worth permitting for an addition runs longer than a simple remodel because of setback and lot coverage reviews, and we factor that into the schedule up front.
The 365-Day Done Right Promise covers the completed work for a full year. If something fails inside that window, we return and correct it at no charge. Written guarantee, signed before we leave the site.
DIY or Call Us?
You can check seams, look for water staining, and test your breakers without touching a tool. That’s fair game. What we don’t recommend is cutting into the wall panels or attempting foundation work on a Boxabl. The steel structure carries load differently than stick framing, and a wrong cut in a load-bearing channel can compromise the whole module. Foundation issues require piers or slab repair engineered for the soil. North Texas clay moves. That’s not a guess, it’s what we see on job sites across Fort Worth every season.
If you’re not sure whether what you’re looking at is normal settlement or something worse, call (682) 204-4897. We’ll send someone who’s actually worked on these units.
FAQs
A properly installed addition tied to a Boxabl shell should last 30 to 50 years with normal maintenance, but the original panel seals generally need attention every 5 to 7 years in our climate. The steel frame itself will outlast the sealant and the roof membrane. Call (682) 204-4897 if you’re past that window and seeing gaps.
Yes, in most cases the shell is sound and the failures are at the seams, the roof penetrations, or the utility connections. Those are repairable. Full panel replacement is rarely necessary unless there’s structural damage from impact or severe settlement. A written assessment is free, so you’re not committing to anything by having us look.
Plan on 3 to 6 months for an attached addition and 6 to 10 months for a full ADU with kitchen and bath. Permitting, foundation work, and utility connections eat most of that time. We give you a schedule in writing before the job starts and hold to it. Call (682) 204-4897 for a straight answer on your specific scope.
We stock the common aftermarket components: steel channel, sealants rated for our UV exposure, and panel fasteners. Boxabl OEM parts are special-ordered when required. We also stock materials for our other brand partners including KraftMaid cabinetry, Cambria surfaces, and Silestone countertops, so finish work doesn’t stall waiting on a freight truck.
Straight scope, firm price, no surprises at final walkthrough. That’s the only way Bradford Remodeling Co Fort Worth runs a job. Call (682) 204-4897 and we’ll get you a written number before anything touches your property.
Written by Curtis Lane, Owner, Bradford Remodeling Co Fort Worth at Bradford Remodeling Co Fort Worth, serving Fort Worth and nearby areas.
