Home Additions & ADU in Cibolo - One Fixed Price, Permits Handled

Fast, Reliable Home Additions & ADU Across Cibolo

A home addition or ADU in Cibolo typically runs $45,000 to $130,000 for a room addition, and $90,000 to $220,000 for a new detached ADU, with garage conversions landing between $30,000 and $80,000. Those are the numbers we quote, in writing, before any work begins. Tom Barrett founded Barrett & Sons Construction in 1998, and he runs it the way he always has: owner on-site, permits pulled, written change orders for every scope adjustment, and a 90-Day Done Right Promise on every job. Call (877) 610-1318 and you’ll get a live person, not a voicemail box.

Call (877) 610-1318

What makes Cibolo different from Schertz or Selma isn’t the style of houses. It’s the dirt under them and the infrastructure still catching up to them. We’re a Home Additions & ADU company that plans around Blackland Prairie clay, post-tension slab engineering, and a city utility schedule that’s still extending into brand-new subdivisions. That local knowledge keeps your foundation from heaving, your rough-in from sitting exposed, and your budget from getting ambushed.

Why Barrett & Sons Construction Is Cibolo’s Preferred Home Additions & ADU Company

We work all over the 78108 ZIP, from the established streets near the Cibolo Valley Ranch area to the newest lots going in east of FM 1103. When a customer off Bolton Road calls about a detached ADU, we know what they’re up against before we see the lot: expansive Vertisol clay that heaves every wet-dry cycle, and a sewer lateral schedule that depends on the city’s utility extension crew, not our framing crew. That kind of familiarity only comes from doing the work here, repeatedly.

Homeowners in Cibolo have a strong local reputation, and we protect ours the same way we protect our license: by publishing our name, our address, and our license number so anyone can look us up. Tom Barrett’s sons run the crews. The crew members who show up at your door are background-checked, uniformed, and answer for the Barrett & Sons name. If something isn’t done right, one call brings Tom back. That’s the 90-Day Done Right Promise, written on every contract, not buried in fine print.

Cibolo hasn’t just grown fast. It’s been ranked among the fastest-growing cities in the United States for over a decade. That means we’re not driving in from somewhere else for a one-off job. We’re here often enough that we’ve learned which subdivisions sit on the heaviest clay, which streets still wait on utility extensions, and which HOA design standards apply to an ADU on a corner lot in Turning Stone versus a cul-de-sac off Wiederstein Road. You can’t Google that. You can only learn it by doing the work.

Our Home Additions & ADU Services in Cibolo

New Detached ADU

A detached ADU in Cibolo is the most involved project we handle, and it’s also where our local knowledge pays off fastest. On a recent build off Bolton Road, our crew spent the first three weeks finalizing pier placement and moisture-barrier detailing for the post-tension slab, then waited on the city’s utility extension crew to connect the new sewer lateral before we could start rough-in. We locked the full scope of work, allowances for the Cambria quartz countertops and Moen fixtures, and the draw schedule in writing before ordering any long-lead items, so when the city’s timeline slipped by eleven days, the client wasn’t hit with a surprise change order. Most detached ADUs in Cibolo run $90,000 to $220,000, and the variance comes from utility tie-in complexity, finish level, and whether the lot needs pier work beyond the standard engineering.

Second Story Additions

Adding a second story in Cibolo means asking an existing slab, often a production-home slab poured in the 2000s, to carry more load than it was originally engineered for. On Blackland Prairie clay, that question has a soil-moisture answer as much as a structural one. We coordinate with a structural engineer to verify what the existing foundation can take, then design drainage grading and moisture-barrier detailing so the addition doesn’t contribute to heave over time. Second-story additions typically fall in the $45,000 to $130,000 range depending on square footage and whether we’re reinforcing the existing frame.

Garage Conversion ADU

Garage conversions are the fastest way to add living space in Cibolo, especially in the 2000s-era master-planned communities where the garages are oversized and the slabs are already there. The catch on a conversion is rarely the framing. It’s the permit history. We see a fair number of converted garages around Cibolo that were done without an inspection sign-off, and opening those walls to verify electrical, plumbing, and insulation is the only honest way to get them up to code. A code-compliant garage conversion ADU runs $30,000 to $80,000, and pulling the permit properly is included in that number, not treated as optional.

Junior ADU & Interior Conversion

A Junior ADU, often a bedroom-and-bath conversion with its own entrance, is the smallest and most budget-flexible way to create a rental unit or in-law suite inside an existing Cibolo home. The local concern is the same as any interior project here: how the existing slab and frame respond to plumbing changes and new wall openings on expansive clay. We scope every interior conversion with a drainage and moisture review so a wet season doesn’t turn a fresh bathroom into a heave problem twelve months down the road.

Trusted Brands We Service in Cibolo

When you’re spending five figures on an addition, the materials should be names you can research. We install Simonton, Ply Gem, and PGT windows and doors across Cibolo, and we stock common parts locally so a window order mistake on a sunroom doesn’t stall the whole job for two extra weeks. If you want Andersen or Marvin on a second-story addition, we can do that too. The point is that every finish we quote is a real brand with a real spec sheet, not a mystery product off a van.

Common Home Additions & ADU Problems We See in Cibolo Homes

• Foundation heave from skipped soil maintenance. A new room addition poured on Vertisol clay without a soil-moisture maintenance plan for the first wet season can heave visibly in under two years. We include drainage grading and moisture-barrier detailing as standard scope, not an upgrade.
• Rough-in left exposed while the city finishes utility work. Cibolo’s municipal boundary has expanded so aggressively that contractors routinely break ground on lots where water, sewer, and road infrastructure is still under active extension. If your ADU timeline doesn’t account for the city’s utility build-out schedule, you end up with a framed structure waiting on a sewer lateral.
• Custom millwork ordered before structural sign-off. Ordering cabinetry or millwork before the structural engineer confirms load-bearing wall modifications is a fast way to double a lead time and trigger a change order. We sequence the engineering first, then order the long-lead items.
• Enclosed patio additions with buckled subfloors. On expansive clay lots, an enclosed patio built without proper drainage grading can buckle within two years. This is a design failure, not a materials failure, and it’s one we catch on the front end.

Pricing for Home Additions & ADU in Cibolo, TX

We Also Serve Cities Near Cibolo

We work in Cibolo and the surrounding communities, including Schertz, Selma, Universal City, and Converse. Scheduling and dispatch are coordinated from our San Antonio office, but the crews live and work in this area. If your project is in any of those cities, the same written-pricing and permit-pulling rules apply.

FAQs - Home Additions & ADU in Cibolo