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

Fast, Reliable Home Additions & ADU Across Terrell Hills

Adding square footage to a Terrell Hills home means navigating a lot more than lumber and drywall. You’re dealing with a fully independent municipality encircled by San Antonio, which means Terrell Hills City Hall operates its own building department, permit office, and code enforcement, entirely separate from Bexar County or the City of San Antonio. Filing with the wrong office is the single most common mistake out-of-area contractors make, and it stalls jobs for weeks. A home addition in Terrell Hills typically runs $45,000 to $130,000, while a detached ADU lands between $90,000 and $220,000. Call Barrett & Sons at (877) 610-1318, and we’ll walk you through the local process before anyone swings a hammer.

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

Tom Barrett founded this company in 1998, and Tom’s sons run the crews today. That’s not a marketing line, it’s how the business actually operates. When you call about a Home Additions & ADU project in Terrell Hills, you’re talking to someone whose name is on the truck. We’ve pulled permits through Terrell Hills City Hall enough times to know what the plan reviewers flag, what the deed restrictions prohibit, and what flies through the first time.

Our reputation in Terrell Hills comes from showing up when we say we will and putting every scope change on paper before work proceeds. Homeowners here have told us stories about national outfits that quoted one number and presented a very different one at the door. We issue written change orders for every allowance adjustment, so the final number never surprises you. A live person answers our phone 24 hours a day, seven days a week, not a voicemail box in another state.

We also carry the local knowledge that prevents expensive rework. Terrell Hills enforces deed restrictions alongside building code, which means an exterior addition can pass permit review and still get denied by a deed compliance review. We check both before breaking ground. If that sounds like extra work, it is. It’s also why our clients don’t get halfway through a project only to find out they needed a second approval they never knew existed.

Our Home Additions & ADU Services in Terrell Hills

ADU Design & Permitting

An accessory dwelling unit in Terrell Hills starts with understanding what the zoning and deed restrictions actually allow on your specific lot. Setbacks, height limits, and utility requirements differ from San Antonio’s, even though San Antonio surrounds you on all sides. We handle design, engineered drawings, and the Terrell Hills permit package as one process, so the plans match what the city will approve. Expect $90,000 to $220,000 for a completed detached ADU, depending on size, finishes, and site conditions.

Garage Conversion ADU

Converting an attached or detached garage into a rental unit or in-law suite runs $30,000 to $80,000 in Terrell Hills. Many of the 1920s through 1950s homes here have garages that were built before modern electrical and plumbing standards, which means utility upgrades are a real part of the cost. We assess the existing slab. Given the Blackland Prairie clay under most of Terrell Hills, a garage slab that’s shifted over 60 or 70 years can require leveling or pier work before framing begins.

New Detached ADU

A ground-up detached ADU on a Terrell Hills lot needs foundation engineering that accounts for the expansive clay soil. We spec post-tension or pier-and-beam foundations as standard, because the same soil movement that cracks driveways will crack a new ADU slab if nobody plans for it. Permits run through Terrell Hills City Hall, not San Antonio, and we submit after verifying deed restriction compliance so there are no surprises at the back end.

Junior ADU & Interior Conversion

A junior ADU, which is typically a converted portion of the existing house with its own entrance and kitchenette, often costs in the $45,000 to $130,000 range depending on the scope. Terrell Hills homes from the Spanish Colonial Revival and Tudor eras frequently have usable space that’s underutilized, like a basement, a side porch that was enclosed decades ago, or a service wing. We’ve converted those spaces while preserving the original character of the house, including original plaster and load-bearing brick, which is exactly what this community expects.

We also handle Kitchen Remodeling in Terrell Hills and Bathroom Remodeling in Terrell Hills, often as part of a larger addition where the new square footage flows into a reworked kitchen or primary suite. Doing all of it under one permit package keeps the timeline coherent and the inspections coordinated.

Trusted Brands We Service in Terrell Hills

When we install flooring, waterproofing, or fixtures in a Terrell Hills addition, we use brands you can look up by name. Schluter systems go under tile in wet areas, and Grohe fixtures show up in bathrooms and kitchens because they hold up and parts remain available. We don’t stock mystery materials off a van. Everything we install can be verified, and every brand we carry has a real warranty behind it. If you’re in the 78209 ZIP code and want to see a finish or a fixture in person before committing, we’ll bring samples to your door.

Common Home Additions & ADU Problems We See in Terrell Hills Homes

• Wrong jurisdiction permits. Contractors who don’t work Terrell Hills regularly file with San Antonio out of habit. Those permits are invalid here, and the restart through Terrell Hills City Hall costs weeks. We file with the correct office the first time.
• Clay soil foundation movement. The Blackland Prairie clay under Terrell Hills swells in wet weather and cracks in droughts. We see older additions with slab cracks running corner to corner because the original builder didn’t account for soil movement. Our foundation specs always do.
• Deed restriction denials after permit approval. Terrell Hills enforces its own deed restrictions separately from building code. An exterior addition or detached structure can pass permit review and then get denied at the deed level. We check both before you spend money on drawings.
• Aging utility infrastructure. Homes built from the 1920s through the 1950s often have original electrical panels, galvanized plumbing, and undersized sewer lines. A new addition that ties into outdated systems will cause problems downstream. We scope utility upgrades as part of the project, not as a surprise change order afterward.

Pricing for Home Additions & ADU in Terrell Hills, TX

We Also Serve Cities Near Terrell Hills

Barrett & Sons works throughout the communities surrounding Terrell Hills, including Alamo Heights, San Antonio, Windcrest, and Kirby. If you live just over the line in any of these areas, the same owner-operated crew, the same written change orders, and the same 90-Day Done Right Promise apply. Call (877) 610-1318 and we’ll confirm coverage for your street.

FAQs - Home Additions & ADU in Terrell Hills