Boxabl Garage Conversion Contractor in Austin: What to Know First
Boxabl garage conversion in Austin typically costs between $45,000 and $85,000 before permit fees, and most jobs run 6 to 10 weeks from first inspection to final walkthrough. Fielding ADU Austin is an independent Boxabl service provider, not a factory-authorized dealer, which means we answer to you and the city inspector, not a corporate warranty line. The price goes in writing before we touch anything, and it does not move unless you change the scope.
If you own a Casita or a Boxabl accessory unit sitting in your garage or on a slab, and the original installer is gone or not returning calls, this page is for you. Reed Calloway and our crew work on Boxabl units across Austin from South Congress to Cedar Park. Call (361) 309-9568 to schedule a free estimate.
How Boxabl Products Fail – and How We Fix Them
- Folding wall seam gaps on early Casita units. The hinge seals on first-generation Casita panels can shrink in Austin’s summer heat, leaving a visible seam line where the wall panels meet. We re-align the hinge assemblies and replace the seal with a UV-stable gasket rated for Texas sun, then re-tension the panel locks so the seam closes flush.
- Floor-to-wall transition leaks after heavy rain. Boxabl units are factory-sealed, but the bond between the floor cassette and wall panels can flex during transport or even minor settling. Water collects at the base channel and wicks into the flooring. We open the transition, correct the shim stack, and re-seal with a polyurethane sealant that stays flexible through Austin’s wet-dry cycles.
- Roof membrane punctures from debris or hail. Austin hail storms can puncture the thin factory roof membrane. It starts as a small stain on the ceiling and becomes a mold issue within weeks. We patch the membrane with a compatible TPO patch, then inspect the underlying insulation for water saturation before closing it back up.
- Electrical panel undersized for garage-converted loads. A Casita shipped with a 50-amp panel was never designed to feed a mini-split, water heater, range, and laundry. Owners add load, and the main breaker trips. We upgrade the interior panel and recalculate the feeder, pulling permits so the work passes Austin Energy inspection the first time.
- Condensation inside wall cavities on climate-controlled conversions. When you convert a Boxabl into finished living space and run AC, the temperature difference between the conditioned interior and the steel structural frame creates sweat inside the wall. We add a vapor barrier and re-insulate the cavities before drywall goes up, so you do not get mold behind the finished wall.
Our Boxabl Garage Conversion Contractor Process
- 1
Call and describe the unit. We ask for the model, year, and what you are trying to accomplish: garage to bedroom, garage apartment, or full ADU conversion. We schedule a visit within days, not weeks.
- 2
Site inspection of the Boxabl and the garage. We check the panel alignment, seals, electrical service, and slab condition. Then we look at the garage itself: header size, fire separation, access, and how the city will classify the conversion.
- 3
Written scope and price. You get a line-item proposal before any work starts. OEM Boxabl parts where they matter, quality aftermarket where they perform better and cost less. The number does not change unless you change the job.
- 4
Permits pulled by us. We file the garage conversion permit with the City of Austin, handle the plan review comments, and schedule inspections. If a setback variance is needed, we write the request and walk it through.
- 5
The work. Our crew shows up in uniform, background-checked, and runs the job like a construction site, not a hobby. Framing, electrical, insulation, drywall, paint, flooring, and all the Boxabl-specific work in between.
- 6
Final test and the written guarantee. We test every circuit, check every seal, and run the HVAC before we call it done. Then we hand you The Garrison Standard guarantee in writing: one full year, and if anything fails, we come back and fix it at no charge.
What Boxabl Garage Conversion Contractor Costs in Austin
Here is what we see across Austin, based on the Boxabl unit and the garage condition. These are real ranges from our jobs, not national averages:
- Garage to bedroom (attached, existing Casita): $45,000 to $60,000. Includes egress, closet, electrical, insulation, drywall, and finish work.
- Garage to full ADU with kitchen and bath: $65,000 to $85,000. Adds plumbing rough-in, a mini-split, and kitchenette. Plumbing cost depends on how far the garage sits from the main sewer line.
- Detached garage conversion with Boxabl repositioning: $60,000 to $95,000. Includes slab evaluation, re-anchoring, utility trenching, and structural corrections.
What moves the price: the age of the Boxabl unit, the condition of the slab, how much electrical upgrade the city requires, and whether you want OEM panels or aftermarket. We never pad a number. Call (361) 309-9568 and we will give you an exact figure in writing.
Why Austin Homeowners Call Fielding ADU Austin for Boxabl Work
We are the ADU and room-addition shop inside the Garrison Partners family. That means we have been building to The Garrison Standard since 2006, and The Garrison Code governs how we work: show up in the window, price in writing, by the book, leave it clean, stand behind it for a year. We write it down and we do what it says.
Every job gets a written price before work starts. No change orders because we missed something in the estimate. Every job gets a written one-year guarantee. If the Boxabl conversion fails inside that year, we return and correct it at no charge. Live person answers the phone 24/7. The crew on your site has been background-checked and shows up in uniform.
Put it in writing, then do what it says. That is how we run Boxabl work in Austin, and that is why owners call us when the first contractor disappears.
FAQs
Yes. Boxabl units share structural DNA, and we work on Casita and other models without needing the original installer’s blessing. We are an independent Boxabl service provider. As long as the unit is on your property, we can inspect it, quote it, and convert it.
We use OEM Boxabl parts where the factory tolerance matters, like folding panel hinges and corner locks. For seals, insulation, electrical components, and finish materials, we use aftermarket products that perform better in Austin’s climate and cost less than factory replacements. You approve every part decision before we buy anything.
Modifications to the structure can affect what Boxabl’s factory warranty covers moving forward. We keep structural changes to a minimum and document every modification with photos and notes, so if you ever deal with Boxabl directly, you have a complete record. Call us at (361) 309-9568 and we will walk you through what matters for your specific unit.
Most conversions take 6 to 10 weeks. The biggest variable is the City of Austin permit review, which can run 2 to 4 weeks depending on the current queue. The physical work on the Boxabl and garage typically takes 4 to 6 weeks. We give you a written schedule and we hold to it.
Yes. Every garage conversion we do in Austin is permitted, inspected, and closed out with the city. No permit board left blank, no “we will final it later.” If the inspector finds something, we fix it and re-schedule. That is part of The Garrison Standard.
Written by Reed Calloway, Owner, Fielding ADU Austin at Fielding ADU Austin, serving Austin and nearby areas.
