A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Terrell Hills, TX
Adding an ADU in Terrell Hills means working with a city that takes its architectural character seriously. The large 1920s-to-1950s estate homes, mature live oaks, and strict design review standards shape every project here, from where a unit can sit to what it can look like from the street. We’re a Terrell Hills ADU company that puts a written price in front of you before any work begins, and we build with prefab brands you can research yourself, including Boxabl, Plant Prefab, and James Hardie cladding. Call (430) 258-2928 to talk through your lot and what’s possible.
Why Terrell Hills Homes Are Different
Terrell Hills housing stock skews custom and old. Most homes were built between the 1920s and 1950s, with masonry exteriors, deep setbacks, and spacious lots shaded by mature oaks. That changes ADU work in practical ways. A detached unit often has to match the main house’s materials, which can mean custom brick or stucco work rather than off-the-shelf panels. Electrical panels from the 1950s typically need upgrading before a new living space can be added, and older plumbing lines may need replacement before tying in a second kitchen or bath.
The climate adds another layer. Hot, humid summers push HVAC sizing and insulation choices, while the occasional winter freeze means water lines in a detached ADU need freeze-proof routing. Shade from live oaks can cut cooling costs, but it complicates roof and solar design when you’re deciding where a unit can capture light. And because many Terrell Hills ADUs are built above existing detached garages or as pool cabanas, the structural condition of the original structure often determines the real cost before any new framing starts.
Permitting here is not a rubber stamp. Terrell Hills applies its own zoning and architectural review standards, and any accessory unit is expected to complement the existing estate home rather than stand out from it. That usually means elevations and materials get a hard look. We handle the paperwork, but homeowners should expect the review process to be a real part of the timeline.
Our Main Terrell Hills Services
Most Terrell Hills homeowners call us about one of three projects: building a new ADU, adding square footage to the main house, or converting a room or garage into usable living space. Here’s how each one works in this city.
ADU Builders in Terrell Hills
A detached ADU in Terrell Hills often goes above an existing garage or replaces an underused backyard structure, which keeps the main house’s street view intact while adding a rentable or family unit. We work with prefab brands like Boxabl and Plant Prefab where the lot and design review allow, and we handle site-built options when architectural standards require matching brick or stone. Setback rules and mature oak canopies usually dictate the exact footprint. Get the full breakdown on our ADU Builders in Terrell Hills page.
Home Addition Contractor in Terrell Hills
Adding onto a 1940s estate home in Terrell Hills means matching rooflines, masonry, and window styles so the new section doesn’t read as an add-on. We see a lot of kitchen bump-outs and primary suite additions here, and many projects start with upgrading the old panel and service before new circuits go in. The city’s architectural review process is part of what we manage from day one. Read the specifics on our Home Addition Contractor in Terrell Hills page.
Room Addition Contractor in Terrell Hills
Room additions in Terrell Hills frequently involve converting oversized bedrooms, enclosed porches, or detached garage bays into functional living space. In older homes, that means assessing what’s behind the walls first: outdated wiring, uninsulated framing, and plumbing that was never meant for a second bath. We price the whole project in writing before demo starts. Details are on our Room Addition Contractor in Terrell Hills page.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Brands We Service in Terrell Hills
We build with and service prefab ADU systems from Boxabl and Plant Prefab, plus exterior cladding from James Hardie, with parts and panels coordinated through our brands network. Sourcing these known names means Terrell Hills homeowners can verify product quality independently before committing to a build.
Pricing for ADU Company in Terrell Hills, TX
| Service | Typical range in Terrell Hills |
|---|---|
| Detached ADU (prefab, 400 – 600 sq ft) | $150,000 – $230,000 |
| Detached ADU (site-built, 600 – 900 sq ft) | $220,000 – $340,000 |
| ADU above existing garage | $180,000 – $280,000 |
| Pool cabana conversion to ADU | $160,000 – $260,000 |
| JADU (attached, under 500 sq ft) | $90,000 – $150,000 |
| Garage conversion to living space | $80,000 – $140,000 |
| Home addition (kitchen bump-out, 200 – 400 sq ft) | $110,000 – $190,000 |
| Primary suite addition (400 – 600 sq ft) | $160,000 – $260,000 |
| Room addition (single room, 150 – 250 sq ft) | $60,000 – $110,000 |
| Electrical panel upgrade (pre-1960 home) | $3,500 – $7,000 |
| Plumbing rough-in for new bath/kitchen | $8,000 – $18,000 |
| Foundation work (pier and beam repair) | $12,000 – $35,000 |
What pushes the price up in Terrell Hills is usually the architectural review: matching period brick or stone, custom window sizing, and structural work on a 1930s garage before any new framing goes in. What doesn’t change is the number. We give you a written price before work starts, and the 365-Day Done Right Promise covers the work for a full year after completion.
Neighborhoods We Serve in Terrell Hills
We work across Terrell Hills, from the estate streets near Terrell Hills City Hall to the quieter lanes bordering Fort Sam Houston and the Salado Creek greenway. Typical response time for a site visit anywhere in Terrell Hills is one to two business days.
- Terrell Hills central estate district
- Wilshire Terrace area
- East Terrell Hills near Harry Wurzbach
- North Terrell Hills near Terrell Road
- Bordering areas near Fort Sam Houston
Service Area – Cities Near Terrell Hills
Our Terrell Hills crews also cover nearby communities across the San Antonio metro. If your property is just outside the Terrell Hills city line, we can typically schedule a site visit without any delay. See our service pages for San Antonio, TX, Schertz, TX, Live Oak, TX, and Leon Valley, TX.
Serving Terrell Hills, TX - Our Local Coverage Area
We’re based in the Terrell Hills 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 About ADU Company in Terrell Hills
We schedule site visits across Terrell Hills within one to two business days. The scheduling team is reachable around the clock at (430) 258-2928, and you’ll get a confirmed arrival time rather than a vague window.
Yes. Terrell Hills applies its own zoning and design standards, and accessory units are typically reviewed to make sure they complement the existing home’s character. We prepare and submit the drawings and handle the review process as part of the project. Call (430) 258-2928 and we’ll explain what applies to your specific lot.
No. Your written price is fixed before any work begins, and the 365-Day Done Right Promise covers the finished work for a full year. If something isn’t right, we make it right. Call (430) 258-2928 for a free estimate on your Terrell Hills project.
Call (430) 258-2928 to schedule your free Terrell Hills ADU estimate. We’ll walk your lot, answer your questions, and put the price in writing before any work starts.
What happens when you call
- 1A real person answersNo phone trees - talk to a local adu pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3We come out and measureLicensed & insured, at a time that suits you - the visit and the quote are both free.
- 4You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.
What Terrell Hills Customers Say
"Solid job. Cabinets arrived late but they adjusted the schedule."
- Eli K."Plumbing and electrical passed on the first inspection."
- Alan B."Room addition off the kitchen. Framing, drywall, and paint all done well."
- Wade L.
