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 New Braunfels
A home addition or ADU in New Braunfels typically runs $45,000-$130,000 for a room addition, and $90,000-$220,000 for a new detached ADU, depending on foundation work, finishes, and whether we hit caliche during excavation. We’re Barrett & Sons Construction, founded in 1998 and owner-operated by Tom Barrett. When you call (877) 610-1318, a live person answers, and the crew that shows up in New Braunfels carries our name on the truck. We have been building and remodeling across 78130, 78131, 78132, and 78135 long enough to know which lots in Veramendi and Vintage Oaks will need extra site work before the framing ever starts.
Why Barrett & Sons Construction Is New Braunfels’s Preferred Home Additions & ADU Company
New Braunfels is not an easy place to build additions cheaply, and the homeowners here know it. The same neighborhood can swing from soft clay to solid limestone within a hundred feet. We price that in from the first walkthrough. Tom Barrett’s sons run the crews, and Tom stays on the job most days, so the person shaking your hand at the estimate is the same one who signs off when the permit inspector leaves. Our Home Additions & ADU team has handled additions in Gruene’s historic stone homes, where matching mortar on a mid-1800s limestone wall is as much art as construction, and in post-2010 tract-built subdivisions in the 78132 corridor, where slab movement and poor original grading already show up before the ten-year mark. New Braunfels homeowners call us because our 90-Day Done Right Promise is written on every contract. If it is not done right, one call brings Tom back. That is the entire promise, in plain words.
Every scope, every allowance, every price change arrives as a written change order before work happens. The permit inspector works for you, not for us, which is why we like him on every job. And we publish Tom Barrett’s name, address, and license number. Look it up before you sign anything. Ask anyone on your street, or check the license yourself.
Our Home Additions & ADU Services in New Braunfels
ADU Design & Permitting
New Braunfels sits on the Balcones Escarpment, where expansive clay alternates with shallow caliche over limestone. That means foundation design is the first conversation, not an afterthought. We handle ADU design and permitting with the engineering already built into the plan, so your 78132 lot near Canyon Lake does not stall at the permit desk because someone forgot the flood-zone elevation requirement. For parcels in low-lying 78130 near the Guadalupe, flood-compliant framing details and elevated foundation designs change the entire permit path. We submit those drawings correctly the first time.
Garage Conversion ADU
A garage conversion ADU in New Braunfels runs $30,000-$80,000 and is usually the fastest path to rental income or a place for family. The catch here is what is under the slab. Many of the post-2010 tract homes in master-planned communities like Veramendi and Vintage Oaks were not built with deep piers, and we regularly see seasonal slab movement from the wet-dry cycles Central Texas is known for. Before we frame a wall, we check the existing foundation. If it is not sound, we say so before a single nail moves, with the price on paper.
New Detached ADU
A new detached ADU in New Braunfels typically runs $90,000-$220,000. The range is wide because site conditions swing hard. In the 78132 Canyon Lake Road corridor, excavation crews often abandon conventional equipment mid-dig and bring in a hydraulic breaker to get through caliche hardpan before reaching stable bearing. That is a site condition cost out-of-market GCs get blindsided by. We already price it in. We also build detached ADUs with the same premium materials we use on full additions, and we pull permits and schedule inspections on every eligible job.
Junior ADU & Interior Conversion
A junior ADU carved out of existing square footage usually lands on the lower end of the $45,000-$130,000 addition range. These conversions make sense in older New Braunfels homes, especially in the historic core around downtown and Gruene, where lot lines are tight and a detached build is not practical. We run the mechanical, electrical, and plumbing work as if it were a standalone home, because once the inspector leaves, it functions as one. You will see the same written change order discipline on a junior ADU as on a full second-story addition.
What happens when you call
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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 New Braunfels
We stock and install brands you can look up before you sign. On ADU baths and kitchenettes, we carry Schluter waterproofing systems and Grohe fixtures, because they hold up through New Braunfels’s humidity swings and hard water. On additions where roofing or exterior transitions come into play, we use GAF materials. We do not show up with mystery brands off a van. If you are comparing bids, ask each contractor which brand of waterproofing they are specifying. Then call us at (877) 610-1318 and compare.
Common Home Additions & ADU Problems We See in New Braunfels Homes
- Caliche and limestone rock during excavation. In the 78132 corridor toward Canyon Lake, crews routinely hit caliche hardpan that requires a hydraulic hammer before stable bearing. Builders from flat-terrain markets like Seguin or San Marcos do not budget for it. We do.
- Expansive clay slab movement. New Braunfels’s wet-dry cycles on clay-over-limestone cause foundation movement in slabs that were not engineered with deep piers. Additions tied into a moving slab without a proper tie-in detail will crack at the seam within a few seasons.
- Flood-zone requirements in 78130 and low-lying 78132. Parcels near the Guadalupe and Comal rivers often sit inside FEMA flood zones, which means elevated foundation designs and flood-compliant framing. The permit path changes entirely, and an unprepared contractor will hand you delays and surprise fees.
- Historic limestone masonry matching in downtown and Gruene. Mid-1800s German limestone homes need specialized stone restoration and mortar-matching that few crews in the regional labor pool know how to do. Detail work like that cannot be faked with a bag of modern mortar.
Pricing for Home Additions & ADU in New Braunfels, TX
Here are the numbers we give New Braunfels homeowners at the first conversation. A room addition runs $45,000-$130,000. A new detached ADU runs $90,000-$220,000. A garage conversion ADU runs $30,000-$80,000. A junior ADU or interior conversion generally lands between $45,000 and $130,000 depending on scope. What moves the price in New Braunfels more than anything is what is under the surface: caliche excavation, pier depth, flood-zone engineering, and whether we are tying into a slab that has already moved. We write the allowance and the scope on paper before work starts, and every change arrives as a written change order. Call (877) 610-1318 to schedule a free estimate. No trip charge inside the county, and a 10% Senior & Veteran discount applies permanently.
We Also Serve Cities Near New Braunfels
Beyond New Braunfels, our crews serve Cibolo, Schertz, Selma, and Universal City. If your property sits on the county line or you are planning an ADU near the Cibolo edge of 78131, ask which crew covers your specific neighborhood. We also handle Kitchen Remodeling in New Braunfels and Bathroom Remodeling in New Braunfels when your addition project grows into a full renovation. Same written change order rule on every job.
Serving New Braunfels, TX - Our Local Coverage Area
We’re based in the New Braunfels 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 New Braunfels
A room addition in New Braunfels runs $45,000-$130,000, a detached ADU runs $90,000-$220,000, and a garage conversion ADU runs $30,000-$80,000. The biggest cost swing in New Braunfels is site work: caliche excavation, pier depth, and flood-zone engineering in low-lying parcels near the Guadalupe or Comal. Call (877) 610-1318 for an exact quote. Estimates are free, and every allowance is on paper before work begins.
Yes, we cover 78130, 78131, 78132, and 78135, including downtown, Gruene, Veramendi, Vintage Oaks, and the Canyon Lake Road corridor. The same crew that handles a historic limestone addition in Gruene also handles a detached ADU in a post-2010 subdivision. Call (877) 610-1318 and tell us which neighborhood you are in.
Only if the scope changes, and only in writing before work happens. If we hit caliche that no reasonable estimator could have predicted, you get a written change order first, not a surprise invoice at the end. An allowance that is not on paper is a surprise waiting for a date. Call (877) 610-1318 and we will walk you through exactly how our change order process works.
Sometimes, and for a real reason. New Braunfels sits on the Balcones Escarpment, with expansive clay over shallow limestone and caliche that regularly requires hydraulic breakers during excavation. Builders in flatter markets like Seguin or San Marcos do not carry that cost. We do, openly. When you compare bids, ask each contractor whether their price includes caliche excavation and flood-zone engineering. Call (877) 610-1318 for a line-item estimate.
Every completed job carries our 90-Day Done Right Promise, written on the contract. If it is not done right, one call brings Tom back to make it right. That applies to every addition, ADU, and conversion we build in New Braunfels. Call (877) 610-1318 to talk through your project.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving New Braunfels and the surrounding Hill Country since 1998.