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Get your free estimateFast, Reliable ADU Builders Across Terrell Hills
Building an ADU in Terrell Hills means clearing a higher bar than almost anywhere else in Bexar County: the architectural review board has to sign off on your design before a single footing goes in. This page explains exactly how that review process works, what the committee looks for, what it adds to your timeline, and what a detached ADU, garage-top unit, or JADU realistically costs here. We are Benson ADU San Antonio, and our ADU Builders team has filed and won architectural review submittals across Terrell Hills, from Garraty Road to Eldon Road. Call (430) 258-2928 for a written price before any work starts.
Why Benson ADU San Antonio Is Terrell Hills’s Preferred ADU Builders Company
Terrell Hills homeowners do not hand a five-figure addition to a contractor who treats their street like any other. The review board evaluates rooflines, materials, setbacks, and how the ADU reads from the curb against the existing 1920s – 1950s estate character. A builder who does not know that a flat-roof studio will get bounced before they know it themselves. We know it, because we file these submittals regularly. Our crew sits down with the design package, flags what the committee will push back on, and revises before the first application, not after the rejection letter.
Troy Eastman leads our Terrell Hills work. When a homeowner on Wiltshire Avenue needed a garage-top ADU approved last spring, Troy walked the lot, measured the oak canopy, checked the alley setback, and ordered James Hardie siding and a Mighty Buildings panel kit the same week the variance was approved. That is the difference between a builder who files and hopes and one who plans around approval. We are background-checked, uniformed, and answer the phone 24/7 with a live person, not a voicemail tree.
JADU in Terrell Hills
A JADU in Terrell Hills is a junior accessory dwelling unit, capped at 500 square feet, typically carved out of existing space inside or attached to the main house, and often the fastest route to legal rental income or an in-law suite when the review board will not approve a detached structure. In Terrell Hills, where lots are generous but the architectural review process is rigorous, a JADU frequently becomes the practical choice because it does not change the street-facing facade at all. Most JADUs here run $85,000 to $145,000 depending on whether you are converting a finished basement, a mudroom wing, or an attached garage bay.
Interior Conversion JADU
This involves walling off an existing suite, adding a kitchenette, and separating the entrance, often under the main roof. The review board usually approves these quickly because nothing changes on the exterior.
Attached Garage JADU
Converting an attached garage bay keeps every wall where it is, adds insulation, a bathroom, and a small kitchen, and leaves the home’s original character fully intact from the street.
ADU Plans in Terrell Hills
ADU Plans in Terrell Hills are the architectural drawing set, site plan, structural calcs, and material schedule that the architectural review board requires before it will even open your file. We produce these plans in-house, with a Terrell Hills lens applied to every sheet: existing home’s roof pitch called out, masonry veneer specified to match, clear tree protection zones drawn around each mature live oak, and the ADU sited to stay clear of the shallow utilities that run through many of these older lots. Plan packages for Terrell Hills ADUs typically run $8,000 to $18,000 depending on whether the unit is site-built, prefab, or a garage conversion.
Review-Ready Submittal Package
Our submittal includes the architectural compatibility statement, elevation drawings showing the ADU against the main house, grading and drainage sheets, and the tree survey the board expects on lots with protected oaks.
Prefab Kit Plan Set
When you choose an Abodu, Cover, or Mighty Buildings unit, we adapt the manufacturer’s stock plans to Terrell Hills’ pitched-roof and masonry-compatibility requirements before filing. That adaptation is where most builders stumble here.
Trusted Brands We Service in Terrell Hills
We build with Abodu, Cover, Tuff Shed, and James Hardie because Terrell Hills homeowners want options they can research independently before signing. For a garage-top unit, we often pair a Mighty Buildings wall panel kit with James Hardie cladding to match the main house, or spec a Cover unit when the lot will not allow a crane. We keep local material lead times dialed in for Terrell Hills jobs, which means no six-week dead spot between approval and framing. If you are deciding between prefab speed and site-built flexibility, call (430) 258-2928 and we will price both against your lot.
Common ADU Builders Problems We See in Terrell Hills Homes
- Flat-roof submittals getting rejected: The Terrell Hills architectural review board expects a pitched roof that matches the 1920s – 1950s estate character. A shed or flat roof typically triggers a rejection and a 2 – 4 week delay. We file pitched-roof designs from the first pass.
- Mature live oak root zones: Deep excavation or a foundation footprint that cuts through critical root zones gets an immediate stop-work order and a tree preservation mitigation plan. We map the canopy edge and keep footings outside the protected radius.
- Outdated garage electrical service: Many Terrell Hills detached garages and pool cabanas run on a shallow 60-amp underground feed. Adding a dwelling unit without upgrading that service first leads to an electrical rough-in red tag and a costly re-trench across a landscaped lot.
- Shallow utility conflicts: Older utility runs sit closer to the surface here than in newer Bexar County subdivisions. We pothole and verify depths before finalizing the ADU footprint, so the foundation plan does not get redrawn at permit time.
Pricing for ADU Builders in Terrell Hills, TX
A detached one-bedroom ADU in Terrell Hills typically runs $225,000 to $360,000 site-built. A garage-top unit lands between $190,000 and $285,000. A JADU conversion inside existing square footage is $85,000 to $145,000. Those numbers include the architectural review submittal, permit package, materials, and labor, but not site-specific unknowns like a full garage electrical re-trench or extensive tree pruning. What moves the price in Terrell Hills specifically: masonry veneer matching, standing-seam metal roofing to match the main house, and the deeper setbacks these lots require. You will get a written price before any work starts, and that price does not drift. Call (430) 258-2928 for a free estimate.
We Also Serve Cities Near Terrell Hills
Beyond ADU Builders in Terrell Hills, we build across San Antonio, Schertz, Live Oak, and Leon Valley. The review process gets simpler outside Terrell Hills, but the written-price rule stays the same everywhere we work.
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 Builders in Terrell Hills
Yes. Terrell Hills requires architectural review for any new dwelling unit, including a conversion of an existing detached garage or pool cabana. The board evaluates the conversion against the same compatibility standards as a new build: roofline, materials, and how the structure reads from the street. A pre-existing garage does not waive that review. Call (430) 258-2928 and we will tell you whether your specific garage will pass as-is or need exterior changes.
Expect the Terrell Hills review to add 4 to 8 weeks beyond what an unincorporated Bexar County permit takes. First-pass reviews often come back with compatibility conditions, which add another 2 to 4 weeks if the plan needs revision. We shrink that timeline by filing a review-ready package the first time: pitched roof, matching veneer, tree survey, and a compatibility statement. Call (430) 258-2928 for a realistic calendar on your lot.
Only if the garage already sits behind the main house and the added second story stays below the main house’s ridge, with matching roof pitch and materials. The board will look at the alley and side elevations, not just the street view. We have done garage-top units that changed nothing visible from the curb. Call (430) 258-2928 and we will walk your lot and tell you what the board will see.
Terrell Hills does not mandate a special HVAC or plumbing system, but the mature live oak canopy and shallow underground utilities push practical design choices. We size units for hot, humid summers, spec moisture-resistant wall assemblies, insulate plumbing against the occasional winter freeze, and run HVAC lines around root zones instead of trenching through them. Call (430) 258-2928 to get a plan that accounts for your trees and your lot’s utility depth.
You revise and re-file. The board returns a written list of conditions, usually roofline, material, or setback changes. We have filed enough of these to know the most common conditions before filing, so first-pass rejections are rare on our jobs. If one happens, we revise the plan, re-file, and adjust the construction schedule so materials are not sitting on site waiting. Call (430) 258-2928 for a free estimate, and we will show you a submittal package built to pass.
Written by Troy Eastman, Owner at Benson ADU San Antonio, serving Terrell Hills and surrounding Bexar County communities.
