Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
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AfterFast, Reliable Home Additions & ADU Across Buda
A home addition in Buda typically runs $45,000-$130,000 for most room additions and garage conversions, while a new detached ADU generally falls between $90,000 and $220,000 depending on size, site work, and utility runs. Those numbers reflect what we see every week across 78610, from Sunfield to Garlic Creek. If your family has outgrown the house but you love the street, the schools, and the ten-minute drive to downtown Buda, an addition or ADU is usually the smarter move than selling. Call (877) 610-1318 and we’ll walk the property with you, take measurements, and put a written scope in your hands before you spend a dime.
Buda isn’t like Austin. The lots are different, the soil is different, and the inspectors know it. We’ve poured slabs in Whispering Hollow where the clay grabbed the foundation and we’ve cut footings on the west side where the limestone fights the excavator every inch. You want a crew that has done both, sometimes in the same week. That’s us. We’re not a franchise sending strangers from another county. Tom Barrett founded this company in 1998, and his sons run the crews that will actually show up on your street in Buda.
Why Barrett & Sons Construction Is Buda’s Preferred Home Additions & ADU Company
Most Buda homeowners we meet have already talked to someone else before they call us. Sometimes a national outfit. Sometimes a guy with a truck and a phone number that stops working. They tell us the same stories: a quote that changed after the contract was signed, a permit that never got pulled, a crew that disappeared for three weeks. We built Barrett & Sons to be the opposite of that. Tom publishes his name, his address, and his license number. You can look them up before you sign anything. You should look them up.
The 90-Day Done Right Promise is written on every contract we sign in Buda. If something isn’t right, Tom comes back and makes it right. One call. No arguing, no fine-print runaround. That’s not a marketing line. That’s the way we’ve worked for over 29 years, and it’s the reason people in Kyle, Shady Hollow, and Buda keep our number saved in their phones. We answer our own phone too. A live person, 24 hours a day, 7 days a week. When you call about your addition in Buda, you’re talking to someone who knows your project, not an out-of-state call center.
We also know the Buda permit office and the inspectors who work this side of Hays County. The permit inspector works for you, not for us, and that’s exactly why we like him. Every eligible job gets permits pulled and inspections signed. The last contractor many Buda homeowners used told them permits were optional. They aren’t. And when you’re adding square footage or building an ADU behind your house, that paperwork protects you when you sell.
Our Home Additions & ADU Services in Buda
Our Home Additions & ADU team handles the full range of work homeowners ask about in Buda. Here’s what we see most.
ADU Design & Permitting
Building a backyard unit in Buda means navigating Hays County setbacks, the city’s ADU rules, and utility service rules that change depending on whether you’re in Sunfield or an older lot near Main Street. We handle the design, the engineering, and every permit through final inspection. If you’re still deciding whether an ADU makes sense on your lot, we’ll tell you straight before you spend design money. Some Buda lots won’t support a detached unit without significant grading work, and we’d rather tell you that on day one than surprise you later.
Garage Conversion ADU
A garage conversion ADU in Buda typically runs $30,000-$80,000, and it’s the most common ADU path we see because the slab and roofline already exist. The catch is that Buda garages built in the 2000s often sit on post-tension slabs, which complicates plumbing rough-ins. We’ve done enough of them in Whispering Hollow and Garlic Creek to know exactly what the saw cuts and X-ray scans cost before we start. You get the number in writing before concrete gets touched.
New Detached ADU
A new detached ADU in Buda runs $90,000-$220,000. The wide range comes down to site work. On the east side of town, you’ll likely need lime-stabilization under the slab to tame the Blackland clay. On the west side, the excavator might hit limestone three feet down, which means rock work and different footing details. We quote both scenarios on the front end. You’ll never get a change order for “unforeseen soil conditions” from us because we already know the soil conditions on your street before we bid.
Junior ADU & Interior Conversion
A junior ADU is a smaller, attached unit, usually a converted bedroom suite with its own entrance and sometimes a kitchenette. In Buda, these are popular with families caring for aging parents or housing adult kids who can’t afford rent in Austin. Because it’s an interior conversion, cost usually lands between $45,000 and $130,000 depending on plumbing, HVAC, and the door and egress requirements. We’ll walk you through the Hays County rules on whether your conversion counts as a JADU or triggers full ADU requirements.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Buda
We install materials you can look up, not mystery brands off a van. For driveway and paver work tied to ADU site prep, we install Belgard and Techo-Bloc products, and we stock Cambridge Pavers and Quikrete materials locally for fast turnaround on Buda jobs. When your addition calls for windows, we use Andersen and Marvin. Roof ties-in use GAF and CertainTeed. You can read the spec sheets before you sign. You’ll know exactly what’s going on your property in Buda, and if you ever want to check a brand name, our crews will point you to the label.
Common Home Additions & ADU Problems We See in Buda Homes
Buda’s growth came fast, and the housing stock shows it. Here’s what we walk into most often.
- Clay soil pushing on foundation additions. Buda sits on the Balcones Escarpment, and in the eastern sections of 78610, the Blackland clay expands and contracts like a sponge through Texas’s drought-and-downpour cycle. We’ve seen slabs heave two inches between July and October. Any addition needs a soil report and the right foundation design, or you’re buying a crack through your new living room.
- Drainage failures on new builds. Flash Flood Alley runs straight through Buda, and runoff from the Hill Country hits hard after a storm. We regularly see site grading that sends water toward the foundation instead of away from it. Before we design any addition or ADU in Buda, we look at where water already pools and engineer the site so the new structure doesn’t inherit the old problem.
- Production-built floor plans that fight additions. Most Buda homes are production builds from the 2000s onward, and their truss roofs and slab plumbing weren’t designed with future square footage in mind. Tying a second story onto a tract house in Sunfield requires a structural engineer who knows those specific truss layouts. We’ve worked on enough of them to spot a no-go before you spend money on plans.
- Utility capacity shortfalls for ADUs. Building a detached ADU on a lot platted in 2005 means the original water and electrical service was sized for one dwelling. In Buda, upgrading the service from the meter and trenching new lines across a clay yard adds real cost. We quote it honestly and put the number in the written scope, so the “surprise” never shows up on a final invoice.
Pricing for Home Additions & ADU in Buda, TX
Here’s what we’re quoting for Home Additions & ADU in Buda right now.
| Project Type | Typical Buda Price Range |
|---|---|
| Room Addition | $45,000 - $130,000 |
| Full ADU Construction | $90,000 - $220,000 |
| Garage Conversion ADU | $30,000 - $80,000 |
| Junior ADU / Interior Conversion | $45,000 - $130,000 |
| Second Story Addition | $45,000 - $130,000 |
| Sunroom / Enclosed Patio | $45,000 - $130,000 |
What moves your number inside those ranges is site work, utility upgrades, and the finish level you choose for cabinets, flooring, and fixtures. A garage conversion in Garlic Creek with basic finishes and a straight utility tap will land on the lower end. A detached ADU on the west side with rock excavation, a new sewer line, and custom kitchen cabinets will hit the higher end. We give you a written line-item quote with every allowance spelled out, and every change comes as a written change order before work proceeds. An allowance that isn’t on paper is a surprise waiting for a date. Call (877) 610-1318 for a free estimate at your Buda property.
We Also Serve Cities Near Buda
Our crews work throughout Hays County and into the surrounding area. In addition to Buda, we serve Shady Hollow, Kyle, Austin, and Hornsby Bend. If your property sits within a short drive, we’ll be there as quickly as any local shop. And if your addition project is also touching the interior, we handle Kitchen Remodeling in Buda and Bathroom Remodeling in Buda on the same permit, which saves you time and keeps one crew accountable for the whole job.
Serving Buda, TX - Our Local Coverage Area
We’re based in the Buda area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs - Home Additions & ADU in Buda
Most Buda additions and ADU projects start within two to four weeks after the contract is signed, assuming the permit office has no backlog. A live person answers our phone when you call (877) 610-1318, and we’ll give you a straight answer after we look at your lot and your scope.
Yes, we cover all of 78610 and the surrounding Buda area, including Sunfield, Whispering Hollow, Garlic Creek, and the older lots near Main Street. We don’t charge a trip fee inside the county, and we schedule our Buda projects close together so we’re in your neighborhood anyway.
It depends on your long-term plan. An ADU gives you rental income or a true separate living space, while a room addition adds square footage to your own home. In Buda, where lot sizes in newer subdivisions are often tight, an ADU can be a smarter use of the same square footage. We’ll walk through both options at your free estimate and give you the numbers for each.
Not without a written change order you sign first. If you change the scope, upgrade a fixture, or add a feature, you’ll get the new number on paper before we touch it. No surprise invoices at the end. That’s the Barrett & Sons way, and it’s been that way in Buda since we started.
Yes, on every eligible job. Permits are pulled, inspections are scheduled, and we don’t frame until the paperwork is right. The permit inspector works for you, not for us, and we want him on your property. If a contractor tells you Buda permits are optional, call us instead. Call (877) 610-1318 for your free estimate.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Buda, TX.