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 Leon Valley
Home additions and ADU construction in Leon Valley typically run $45,000 to $130,000 for a full addition, and $90,000 to $220,000 for a detached ADU, depending on scope, foundation work, and finish level. But here’s the part most homeowners don’t hear until they’re three weeks into a stalled permit: Leon Valley is its own city with its own building department on Bandera Road, and if your contractor files with San Antonio or Bexar County by mistake, your framing inspection won’t just be late. It won’t be scheduled at all. We know because we pull permits through Leon Valley City Hall on every eligible job, and we’ve spent the last 29 years learning which inspections take three days and which ones take two weeks. You can reach us at (877) 610-1318 anytime, and Tom Barrett or one of his sons will walk you through what your specific house needs.
Why Barrett & Sons Construction Is Leon Valley’s Preferred Home Additions & ADU Company
Tom Barrett started this company in 1998, and he still answers his own phone. When a Leon Valley homeowner on Rolling Ridge Drive calls to ask whether their back patio can support a second story, Tom doesn’t hand the phone to a call center. He asks about the slab, the year the house was built, and whether there’s any visible cracking near the door thresholds. That’s not a sales script. That’s what thirty years of building in Bexar County clay does to you.
Our Leon Valley customers see Tom or his sons on-site most days. This is not a franchise sending out a crew nobody’s met before. The people who build your addition wear the Barrett & Sons name on their shirts and they’ve been background-checked, and most of them have been with us for a decade or more. When a customer in the 78240 zip code calls with a question about their sunroom footing, someone who knows their street answers.
The permit inspector in Leon Valley works for you, not for us. That’s exactly why we like the relationship we have with the city. We file early, we don’t argue with corrections, and we’ve never once told a customer that permits are optional. Ask anyone who’s had an un-permitted add-on discovered during a re-sale. It costs more to fix than it ever saved.
Our Home Additions & ADU Services in Leon Valley
We handle the full range of Home Additions & ADU work for Leon Valley homeowners, and we’ll tell you plainly which projects make sense on your lot and which don’t. That’s part of the job.
ADU Design & Permitting
Leon Valley’s permitting process rewards preparation. We work through the city’s requirements early so your job doesn’t stall waiting for a small in-house inspection staff. The design work accounts for Leon Valley’s shrink-swell clay, which means footings and slab details that would pass in a coastal-plain neighborhood sometimes need adjustment here.
Garage Conversion ADU
Many Leon Valley homes from the 1950s through 1970s have attached garages with original slabs that have moved over the decades. Before we convert a garage, we check for level, for proper electrical service, and for un-permitted work a previous owner may have done. A typical garage conversion in Leon Valley runs $30,000 to $80,000, and we’ll tell you before you spend a dollar if yours is the kind that’s straightforward or the kind that fights back.
New Detached ADU
A detached ADU on a Leon Valley lot means new footings, new utilities, and a new address with the city. We pull the permits, coordinate the utility disconnects and reconnects through Leon Valley’s process, and build with framing and materials that handle the clay movement better than the original ranch houses have. Expect $90,000 to $220,000 for a finished, permitted unit, depending on square footage and finish level.
Junior ADU & Interior Conversion
Sometimes the fastest and smartest path is inside the house you already own. A junior ADU carved from a big living room or a converted bedroom stays within the existing footprint. Leon Valley zoning rules differ from San Antonio’s, and we check those before we draw a single line, because a junior ADU with a kitchenette triggers different requirements than a bedroom conversion.
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 Leon Valley
We put our name on materials you can look up. On Leon Valley projects we routinely install windows and patio doors from PGT and Simonton, and we use Ply Gem where the design calls for it. Those are products with published specs and warranties, not whatever was cheapest at the supply house. If you’re already living with one of these brands and need the addition to match, we can source the same lines so your new sunroom doesn’t look like it came from a different house than the rest of your home.
Common Home Additions & ADU Problems We See in Leon Valley Homes
- Slab movement from shrink-swell clay. Leon Valley sits right where the Hill Country limestone gives way to deep coastal-plain clay near the Balcones Escarpment. Drought years pull moisture out of the soil and the slab drops; wet years push it back up. Before we build anything, we check the existing foundation, because adding weight to a moving slab is the fastest way to crack a new addition.
- Undersized electrical panels from the 1960s and 1970s. Most original Leon Valley ranch homes were built with 60-amp or 100-amp panels. An ADU with a kitchenette, a mini-split, and a laundry hookup often needs a service upgrade, and we’ll tell you that in writing before you’re surprised by it.
- Un-permitted add-ons from previous owners. Decades ago, a lot of porches got closed in and a lot of carports became bedrooms without a single file at Leon Valley City Hall. When we open up a wall, we sometimes find what the last owner left. We document it, we bring it to the city’s attention in the right way, and we fix it properly.
- Drainage that pushes water toward the foundation. The same clay that moves the slab also holds water. Leon Valley lots with poor grading or old gutters can push moisture right up against a new addition. We address drainage as part of the build, not as an afterthought when the drywall starts showing a water stain.
Pricing for Home Additions & ADU in Leon Valley, TX
You’ll hear a lot of numbers from contractors, and most of them are guesses. Ours aren’t. A room addition in Leon Valley runs $45,000 to $130,000. A garage conversion ADU runs $30,000 to $80,000. A new detached ADU runs $90,000 to $220,000. What changes the number is square footage, foundation condition, finish choices, and what the city requires on your specific lot. We put every scope item, every allowance, and every price in writing before we start. If anything changes, you get a written change order before the work happens, not a surprise invoice at the end. Call (877) 610-1318 and we’ll give you a real number for your house, not a range somebody made up over the phone.
We Also Serve Cities Near Leon Valley
While this page is for Leon Valley homeowners, our crews also work in nearby communities like Lackland Air Force Base, Alamo Heights, Terrell Hills, and San Antonio. If you’re in one of those areas, the same Leon Valley team that handles your neighborhood can take the job. We also do Kitchen Remodeling in Leon Valley and Bathroom Remodeling in Leon Valley for homeowners who want the same permits-pulled, change-orders-in-writing approach in other parts of the house.
Serving Leon Valley, TX - Our Local Coverage Area
We’re based in the Leon Valley 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 Leon Valley
We can typically begin site evaluation and measurements within a week of your call, and we file permits with Leon Valley immediately after you approve the scope. The city’s small inspection staff means early filing matters more here than in larger municipalities. Call (877) 610-1318 and we’ll give you a timeline for your specific project.
Yes. We work throughout the 78240 zip code, including homes off Evers Road, Bandera Road, and the residential streets between Huebner and Grissom. Our crews know the ranch homes, the corner lots, and the drainage patterns across the city.
If a storm or a sudden foundation issue interrupts work, you call us and a live person answers, day or night. We don’t hand you a voicemail box. We’ll send someone to assess the problem, and we’ll tell you what it costs before we fix it, in writing if it changes the original scope.
Our prices aren’t the cheapest, and we won’t pretend they are. What you get in Leon Valley with us is a written scope, permits pulled through Leon Valley City Hall, named-brand materials, and a 90-Day Done Right Promise. A cheaper bid that skips the Leon Valley permit is a bill waiting to happen. We’d rather be the bid you can verify.
Every job we complete includes the 90-Day Done Right Promise in writing. If something isn’t right, Tom Barrett comes back and makes it right, one call. No fine print, no dispute process, no runaround.
Ready to talk about your Leon Valley addition or ADU? Call Tom and the team at Barrett & Sons Construction at (877) 610-1318 for a free, no-pressure estimate. We’ll show up on time, look at your foundation, review your lot, and tell you what it’ll really take. No surprise invoices, no change orders that appear out of nowhere, and no permits skipped. Just the straight story, the way it should’ve been done the first time.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Leon Valley and surrounding communities since 1998.