A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Castle Hills, TX
Adding an ADU in Castle Hills, TX means working with a city that takes its residential character seriously. Most homes here were built between the 1950s and 1970s, with ranch layouts and brick veneer exteriors sitting on moderately sized lots. That shapes every project we take on: setbacks are tight, lot coverage rules are strict, and the most practical path is often a garage conversion or a second-story addition rather than a ground-up detached unit. We build for this reality, not against it. Call (430) 258-2928 for a written estimate on your Castle Hills project.
Why Castle Hills Homes Are Different
Castle Hills is nearly built out. There’s almost no vacant land left, which means ADU projects here rarely start with a blank backyard. The most common paths are converting an existing attached garage into a living unit or adding a second story above the original footprint. Both options bump into the city’s setback and lot coverage requirements, so variances are often part of the conversation. Homeowners who’ve been through it describe it as a negotiation between what the property can physically support and what Castle Hills will approve.
The housing stock itself is older. Ranch-style homes with brick veneer from the mid-century era dominate, and that means we’re frequently working with original utility connections, older slab foundations, and electrical panels sized for a 1960s household, not a modern ADU with its own HVAC and appliance load. South Central Texas summers add another layer: cooling demand is relentless from May through September, so insulation, air sealing, and properly sized air conditioning are not upgrades here, they’re baseline requirements. Occasional heavy rain events also mean moisture management at the slab edge and around penetrations needs real attention on Castle Hills jobs.
Our Main Castle Hills Services
Castle Hills homeowners call us most often about two things: building an accessory dwelling unit on their existing lot, or expanding the home they already have. Both services have their own dedicated Castle Hills pages below.
ADU Builders in Castle Hills
An ADU in Castle Hills usually means a garage conversion or a detached backyard unit, and both come with the same zoning conversation: setbacks, lot coverage, and variance applications. Because the city emphasizes preserving its low-density, suburban feel, we spend real time upfront making sure the plan fits what Castle Hills will actually approve. Older utility connections and slab conditions often need evaluation before framing starts. We walk you through that process in writing, with a fixed price attached. ADU Builders in Castle Hills
Home Addition Contractor in Castle Hills
Home additions in Castle Hills typically mean expanding the main structure rather than adding a separate unit. Given the age of the housing stock, that often involves reinforcing or tying into an existing slab, upgrading the electrical panel, and matching brick veneer or siding to the original 1950s-to-1970s exterior. Second-story additions are common here because the lots rarely have room to spread out sideways. We handle the structural work, the finishes, and the permit paperwork. Home Addition Contractor in Castle Hills
Room Addition Contractor in Castle Hills
A room addition in Castle Hills can be as simple as converting a covered porch into conditioned space or as involved as a full second-story build over the existing footprint. The older slab foundations and original framing on many Castle Hills homes mean we always check what’s underneath before we commit to a plan and a price. You’ll get a written number that includes the structural work, finishes, and the city’s permit fees, so there’s no surprise line item waiting at the end. Room Addition Contractor in Castle Hills
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 Castle Hills
We build with brands Castle Hills homeowners can research independently, including Boxabl, Plant Prefab, and James Hardie cladding. When we spec a prefab panel system or exterior material, we tell you exactly which one and why it fits your lot and your budget. See our brands for the full range we work with.
Pricing for ADU Company in Castle Hills, TX
| Service | Typical range in Castle Hills |
|---|---|
| Prefab ADU (per sq ft) | $250 – $450 |
| Garage conversion ADU | $120,000 – $200,000 |
| Detached backyard ADU | $180,000 – $350,000 |
| Second-story ADU over garage | $200,000 – $400,000 |
| Room addition (12×16) | $30,000 – $60,000 |
| Room addition (20×20) | $65,000 – $120,000 |
| Second-story addition (400 sq ft) | $120,000 – $220,000 |
| Second-story addition (800 sq ft) | $180,000 – $350,000 |
| Full home addition (ground-up wing) | $150,000 – $400,000 |
What pushes cost up in Castle Hills is the variance work. When a project needs a setback or lot coverage exception, there’s additional design time and city review involved. The good news is that we put every number in writing before any work starts, so you’ll know the variance-related costs on the front end, not after the framing is up.
Neighborhoods We Serve in Castle Hills
Castle Hills is small, but the neighborhoods within it have distinct characters and lot patterns. We work across the entire city, and response time for an estimate visit is typically within a few business days. These are some of the areas we serve:
- Castle Hills proper (the original city center)
- The area along West Avenue
- Neighborhoods off Loop 410
- The residential streets near Northwest Military Highway
Service Area – Cities Near Castle Hills
While this page covers Castle Hills specifically, our crews also serve surrounding communities in the San Antonio metro. You can read about ADU work in San Antonio, TX, Schertz, TX, Live Oak, TX, and Leon Valley, TX on their own pages.
Serving Castle Hills, TX - Our Local Coverage Area
We’re based in the Castle 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 Castle Hills
Often, yes. Because Castle Hills is nearly built out and enforces strict setback and lot coverage rules, many garage conversions and detached ADUs require a variance. We review your specific lot and the city’s current requirements before quoting, so you’ll know whether a variance is part of your project from the start. Call (430) 258-2928 for an exact assessment.
Most Castle Hills ADUs take 6 to 12 months from design to final inspection, with variance approvals adding time at the front end. Prefab systems like Boxabl or Plant Prefab can shorten the on-site construction phase compared to full site-built framing. We give you a written schedule with your written price, so you can plan around it.
Yes. We prepare the drawings, file with the city, and manage corrections if the review comes back with notes. You’ll see the permit fees listed in your written estimate, not as a surprise after the fact. You can track the status of your permit and your build through our project dashboard at any point.
Ready to talk through your Castle Hills project? Call (430) 258-2928 and we’ll schedule your free estimate, answer questions about variances, and put a written price in front of you before any work begins.
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 Castle Hills Customers Say
"Photos of each milestone, which I loved. Slab, framing, roof dry-in, each one came with a few pictures by text."
- Gwen D."Solid job. Cabinets arrived late but they adjusted the schedule."
- Eli K."Plumbing and electrical passed on the first inspection."
- Alan B.
