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 Schertz
A full home addition in Schertz typically runs $45,000 to $130,000, while a detached ADU often lands between $90,000 and $220,000 depending on size, site prep, and finishes. Most Schertz homeowners we talk to are either outgrowing a builder-grade floor plan from the 2000s or trying to house aging parents without sending them to a facility. You’re not just adding square footage; you’re solving a space problem that’s been nagging for years, and you want it done by someone who understands what Schertz clay soil does to a foundation before the first pier is poured. Call us at (877) 610-1318 and we’ll walk the property with you, no charge inside the county.
Our Home Additions & ADU team has spent years working subdivisions across Schertz, from established streets near Wiederstein Elementary to newer builds east of I-35. That matters because Schertz isn’t San Antonio. The soil here moves, the slab reacts, and the original builder grading often needs correcting before an addition ever gets framed. We’ll tell you that in plain English on the first visit.
Why Barrett & Sons Construction Is Schertz’s Preferred Home Additions & ADU Company
Tom Barrett started this company in 1998, and he still answers his own phone. That’s not a slogan; it’s how we operate. When you call about an addition in Schertz, you’re not routed to an out-of-state call center. You talk to a person who knows the difference between working near Clemens High School and working out by the Cibolo Creek floodplain, because he’s driven both a hundred times.
Our crews are Tom’s sons and the teams they’ve trained. They show up in uniform, background-checked, and carrying the Barrett & Sons name on the truck. Every addition or ADU we take on in Schertz gets permits pulled and inspections signed. We don’t treat permits as optional, and we’ve met plenty of Schertz homeowners whose last contractor told them permits didn’t matter. The permit inspector works for you, not for me – that’s why I like him.
Most of our Schertz work comes from referrals. Neighbors see a job going up, ask who’s doing it, and call. We’ve earned that by putting every scope, every allowance, and every price change in writing before a single nail moves. An allowance that isn’t on paper is a surprise waiting for a date, and surprises are what burned you last time.
Our Home Additions & ADU Services in Schertz
ADU Design & Permitting
Schertz sits in a weird spot for ADUs: city rules, county oversight, and HOA covenants all overlap in places. We handle the design and the paperwork so you don’t have to sort through three agencies on your own. Our team files the plans, schedules the inspections, and keeps the permit process moving even when the City of Schertz review queue backs up after storm season. You get a written timeline and a single point of contact.
Garage Conversion ADU
A garage conversion in Schertz usually runs $30,000 to $80,000 and is the fastest path to a rentable unit or an in-law suite without changing your roofline. The catch here is the slab. Many attached garages in Schertz were poured with little thought to the clay underneath, so we test the slab before we frame any walls. We also re-grade the driveway approach on most conversions in the 78154 area, because settled builder grade channels water where it shouldn’t go.
New Detached ADU
A detached ADU on a Schertz lot means new foundation work, and that means planning for clay movement from day one. We design piers and post-tension slabs that account for the region’s wet-dry cycles, and we match exterior siding and roof lines to the main house so the unit doesn’t look dropped in from another neighborhood. Expect $90,000 to $220,000 depending on whether you want a studio or a two-bedroom unit with full kitchen.
Junior ADU & Interior Conversion
Sometimes the answer is already inside the house. A junior ADU carved out of an oversized bonus room or a formal dining area can give an aging parent a private entrance, a small kitchenette, and a full bath for a fraction of the cost of new construction. We see this a lot in Schertz homes built between 2005 and 2015, where the original floor plan left a 300-square-foot room that never earned its keep. Interior conversions generally run $45,000 to $90,000 with finishes factored in.
We also handle Kitchen Remodeling in Schertz and Bathroom Remodeling in Schertz for homeowners who’d rather renovate than add on. Sometimes the smart money isn’t in more square feet; it’s in using the square feet you already have.
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.
Common Home Additions & ADU Problems We See in Schertz Homes
- Slab movement under recent construction. Schertz is built on Blackland Prairie clay, and the post-2000 housing boom put thousands of slabs on ground that’s still settling. We regularly find door frames that bind, brick veneer cracks, and utility penetrations that have shifted even on homes that are only 12 or 15 years old.
- Builder grading that settled backward. Original subdivision grading should slope away from the house. In many Schertz neighborhoods east of I-35, it didn’t hold. Rainwater runs toward the slab, soaks the clay, and the whole foundation heaves. We add drainage correction to most addition projects in these areas.
- Thermal stress on openings and flashing. Schertz summers routinely pass 100 degrees. That heat expands metal framing, flashing, and cladding, and when a shoddy addition doesn’t leave proper expansion gaps, you get buckling and water intrusion. We’ve torn open additions that failed in under five years because the original crew ignored this.
- Oversized additions that dwarf the lot. Some Schertz lots in master-planned communities are narrower than buyers realize. A poorly planned second-story addition can eat every usable yard space and still feel cramped inside. We design to the lot and the HOA setback rules, not just the wish list.
Trusted Brands We Service in Schertz
We install materials you can look up by name, not mystery stock off a van. On Schertz addition and ADU jobs, we regularly work with Andersen and Marvin windows, GAF roofing, and Techo-Bloc pavers for driveways and patio hardscapes that tie the new space to the old. When you’re spending six figures, you should know what you’re getting. We’ll write the brand and model into your contract, and if that brand is backordered, you’ll hear about it before we substitute anything.
Pricing for Home Additions & ADU in Schertz, TX
Here’s what current Schertz market rates look like, with real numbers from jobs we’ve priced in the past year:
- Room addition (single story): $45,000 - $130,000
- Second-story addition: $90,000 - $200,000
- Garage conversion ADU: $30,000 - $80,000
- New detached ADU: $90,000 - $220,000
- Junior ADU / interior conversion: $45,000 - $90,000
- Sunroom or enclosed patio: $25,000 - $70,000
What moves the number in Schertz: foundation corrections from clay movement, drainage re-grading, HOA architectural review delays, and whether your lot requires pier work before framing. You’ll get a written, line-item estimate before you commit. We don’t hand you a phone quote and then show up with a bigger bill. Every change after that arrives as a written change order before work proceeds. Call (877) 610-1318 to schedule your free estimate.
We Also Serve Cities Near Schertz
Our crews work throughout the Schertz area, including Schertz proper, Selma, Universal City, Cibolo, and Converse. If you’re right on the line between two municipalities, call us anyway. We’ll tell you which permit office has jurisdiction and handle it from there.
Serving Schertz, TX - Our Local Coverage Area
We’re based in the Schertz 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 Schertz
We typically schedule Schertz estimates within a few business days, and because our dispatch is coordinated from the San Antonio office, there’s no trip charge anywhere inside the county. Call (877) 610-1318 and we’ll find a time that works.
Yes. We work the full 78154 area, from the established neighborhoods around Wiederstein Elementary out to the newer subdivisions north and east of the city. If you’re inside Schertz city limits, we cover it.
Schertz ADU pricing runs at or slightly above Selma and Universal City because of the soil conditions. The clay here means more foundation planning, and on many lots, drainage correction gets folded into the job. A detached ADU in Schertz typically costs $90,000 to $220,000. Call (877) 610-1318 for an exact quote on your lot.
Not without your signature. If we hit something unexpected in demolition or the soil test comes back worse than the builder’s original report indicated, you get a written change order before we spend a dollar more. We don’t do surprise invoices at the end.
Every Barrett & Sons job carries the 90-Day Done Right Promise, written into the contract. If something isn’t done right, one call brings Tom back to make it right. No fine-print chase, no claim department.
If you’re thinking about adding on, converting the garage, or building a detached ADU in Schertz, call (877) 610-1318. We’ll walk the lot, look at the slab, check the grading, and give you a real number in writing. No pressure, no phone-quote bait, just the straight story from a local crew that stands behind its work.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Schertz and the surrounding area since 1998.