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Belgard Home Additions & ADU: The San Antonio Owner’s Guide
Belgard home additions and ADUs in San Antonio typically run $45,000 to $130,000 for a full project, with detached ADU construction landing between $90,000 and $220,000. We install and build Belgard-compatible additions across Bexar County, and most homeowners call us after discovering their existing structure is settling, cracking, or failing a foundation check. The projects we take on range from slab-on-grade room additions to full detached units that need plumbing, electrical, and Belgard paver integration that matches the main house.
What usually brings San Antonio homeowners to this page is a project that stalled: a contractor who quoted low and vanished, a foundation that shifted after last summer’s drought, or a permit that got tangled at the city. We handle the whole thing, so you’re not coordinating three separate crews while trying to figure out what Belgard products are already on your property.
Which Belgard Models This Applies To
Belgard doesn’t make a “home addition kit,” so the real question is which Belgard product lines integrate with your addition or ADU. Most San Antonio homes we see use Belgard pavers for patios, walkways, and driveways that tie into the new structure. The common lines are the Catalina, Dublin, and Mega-Lafitt series for paving, plus Weston Stone and BelAir Wall for retaining walls and planter borders. If you have an existing Belgard paver patio, your ADU slab or foundation should account for the height difference before we pour anything.
Here’s the compatibility gotcha most owners miss: Belgard pavers come in 60mm, 80mm, and occasionally 100mm thicknesses depending on the series and whether they’re rated for vehicular traffic. If you’re extending a paver walkway from your house to a new ADU, and the existing pavers are 60mm Dublin while your driveway uses 80mm Mega-Lafitt, we need to match the right series to the right application or the surface will fail within two or three San Antonio summers. Aftermarket paver equivalents exist, but for additions and ADUs, we recommend staying with OEM Belgard product because color variation between manufacturers is noticeable when old meets new in a single sightline.
Styles & brands we work with
Signs Your Belgard Home Additions & ADU Is Failing
- Foundation cracks wider than a quarter at the slab edge. San Antonio’s clay-heavy soil expands and contracts hard through drought and rain cycles. A hairline crack is normal; a gap you can fit a key into means your addition’s slab is moving independently from the main structure.
- Doors and windows that stick in summer and swing loose in winter. That’s not humidity, that’s frame racking. When a room addition wasn’t tied into the existing foundation correctly, the seasonal soil shift torques the framing and the door clearances move with it.
- Paver walkways or patios sloping toward the addition instead of away. Belgard paver surfaces should pitch a quarter inch per foot away from any structure. Reverse slope pushes water into the foundation and creates the exact conditions that fail a slab in five years.
- Drywall seams cracking at the corner where the addition meets the original house. If the contractor didn’t install a proper expansion joint or the framing wasn’t anchored to code, the two structures move at different rates and the seam telegraphs it.
- Mold or mildew smell in a new ADU after the first heavy rain. San Antonio gets real storms. If the Belgard paver drainage wasn’t laid with proper base material and slope, water pools under the structure and that damp never dries out in our humidity.
See the difference
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After
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AfterReplacement Cost & What’s Included
For a home addition or ADU rebuild on an existing Belgard paver site in San Antonio, you’re looking at $45,000 to $130,000 depending on square footage, foundation condition, plumbing and electrical runs, and whether you’re matching existing Belgard hardscape or starting fresh. A detached ADU with its own kitchenette and bath lands in the $90,000 to $220,000 range.
What drives the number is concrete condition, site access, and how much of the original Belgard paver work can be salvaged. We pull pavers and re-lay them whenever the base is sound, which saves real money versus buying new product. Every quote includes a written price before any work starts, so the number we hand you is the number you pay. No change orders because we “discovered something” after we started digging. If we find a problem mid-project, we show you photos, explain the fix, and the price stays where we put it in writing. Our work carries the 365-Day Done Right Promise: if it’s not done right, we make it right, for a full year after we hand you the keys.
DIY or Call Us?
You can safely check a few things yourself: look for paver movement around the addition, check that downspouts discharge at least three feet from the slab, and watch for doors that bind. That’s information worth having when you call us. What you shouldn’t DIY is anything touching the foundation, the framing where old meets new, or plumbing and electrical runs inside an ADU. One wrong re-grade and you’ve sent water into your own slab. One wrong wire pull and you’ve got a fire hazard in a unit someone sleeps in.
Luca Romano has been around construction long enough to know the difference between a project a homeowner can handle and one that needs a crew. This one needs a crew. If your Belgard addition or ADU is showing any of the failure signs above, call us at (432) 547-6806 and we’ll take a look. The craft comes first. Everything else follows.
FAQs
A properly built addition on a correctly poured slab with sound Belgard paver drainage should last 50 years or longer, but San Antonio’s clay soil means the foundation and drainage are the deciding factors, not the frame or the finish work. If water is managed right and the slab was poured with proper rebar and depth, the structure outlives the roof and the windows.
Yes, if the frame is square and the foundation is stable, we can fix drainage, replace failing Belgard pavers, correct door and window racking, and address drywall seams without a teardown. The call to make is whether the foundation has moved beyond a correctable point, and that requires an on-site look at the actual slab and soil.
A room addition typically runs 8 to 16 weeks depending on scope, and a full ADU with kitchen and bath runs 4 to 8 months. San Antonio’s permit process and our summer heat both shape the schedule, and we’ll give you a timeline in writing before we start. Call (432) 547-6806 and we’ll walk you through what applies to your project.
We maintain relationships with Belgard suppliers across the San Antonio area and can source OEM Belgard pavers, retaining wall blocks, and edge restraints for most active product lines. If your existing hardscape is discontinued, we’ll match the closest current series and show you samples before we lay a single paver. Call (432) 547-6806 to schedule a free estimate and we’ll bring the material options to you.
Written by Luca Romano, Owner, Sawyer Remodel San Antonio at Sawyer Remodel San Antonio, serving San Antonio and nearby areas.
