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Belgard Home Additions & ADU: The San Antonio Owner’s Guide
If you’re planning a Belgard home addition or ADU in San Antonio, the installed cost typically lands between $45,000 and $130,000 depending on square footage, foundation work, and the Belgard materials you choose. Most San Antonio homeowners first reach out when they realize their existing outdoor living space isn’t holding up the way they expected, pavers have shifted after a hard freeze, or they’re simply out of room and need a structure that works with the Belgard products already on their property. We stock Belgard-compatible materials and can usually start your project within two to three weeks of the written estimate.
Elmstead Remodeling San Antonio is an independent remodeling contractor, not affiliated with Belgard. That means we recommend Belgard where it’s the right fit, but we’ll also tell you plainly when a different paver, wall block, or edge restraint makes more sense for your specific site.
Which Belgard Models This Applies To
Belgard’s catalog for additions and ADU foundations breaks into a few families, and the compatibility details matter more than most people expect. The Catalina, Mega-Arbel, and Urbana paver lines are the ones we see most often under San Antonio patios, walkways, and outdoor kitchens that later become part of a larger addition. For retaining walls that hold back soil against a new ADU foundation, the Diamond and BelAir wall systems are the two most common choices we work with.
The gotcha most San Antonio owners hit is thickness. Belgard’s 60mm pavers are rated for pedestrian use only, not for an ADU slab that will carry a structure. If you’re building an accessory dwelling unit over a paver base, you need the 80mm version or a poured concrete slab with Belgard pavers only as the finish layer. Check the underside of any existing paver: Belgard stamps the series name and thickness there, weather-faded but readable. OEM Belgard pavers and blocks are the only choice we recommend for load-bearing applications. Aftermarket equivalents exist for edge restraints and joint sand, but a mismatched block height in a wall course is the kind of mistake that shows up as a crack line two years after the job is done.
Styles & brands we work with
Signs Your Belgard Home Addition or ADU Foundation Is Failing
- Pavers have settled or sunk in one corner while the rest of the surface reads level. This almost always means the gravel base was not compacted in lifts before the pavers went down, or water has been washing fines out from under the edge. In San Antonio’s clay-heavy soil, this shows up fast after heavy rain.
- You see a hairline crack running across the middle of a Belgard retaining wall near the planned addition. That crack is the wall telling you the soil behind it is expanding and contracting faster than the blocks can hold. It’s common after a wet spring followed by a dry August, and it never gets better on its own.
- Water pools against the house or the planned ADU slab after every storm. Belgard surfaces are only as good as the drainage beneath them. If the base layer wasn’t sloped or a French drain was skipped, water pushes pavers apart from underneath and creates freeze-thaw heaving in January.
- Edge restraint has popped loose and pavers are drifting outward at the border. Once the edge lets go, the whole field starts to spread. Individual pavers rotate, gaps widen, and the interlock that gives the surface its strength is gone.
- Weeds or ants are pushing up between pavers in a straight line. That line is often the seam where two base sections were joined or where a buried downspout drains. It tells you water is moving under the surface where it shouldn’t be.
See the difference
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AfterReplacement Cost & What’s Included
A full Belgard home addition or ADU in San Antonio runs $45,000 to $130,000 installed. At the low end, you’re looking at a single-room bump-out with a Belgard paver walkway tying it into the yard. At the top, a detached ADU with a full Belgard paver courtyard, retaining walls, and a new drainage system. The biggest cost drivers are excavation and soil correction (San Antonio’s expansive clay often requires a deeper base than the national average), foundation type, and whether you’re matching existing Belgard product that has been discontinued or weathered to a color no longer produced.
Every estimate from Elmstead Remodeling San Antonio is a written line-item price before any work starts. You’ll see the cost of materials, labor, permits, and haul-away broken out separately. Graham Stein writes the scope himself, and the number you sign is the number you pay. The 365-Day Done Right Promise covers the full project, including the Belgard surfaces, for a full year after completion. If something isn’t right, we make it right.
DIY or Call Us?
There are honest checks any San Antonio owner can do: look for visible settling after rain, check that downspouts discharge at least three feet from any Belgard edge, and confirm no pavers have shifted more than a quarter inch out of plane. Those observations help us diagnose faster when you call.
What we don’t recommend is pulling up Belgard pavers or blocks yourself to “see what’s underneath.” The base layer is load-bearing and once disturbed, it compacts unevenly, which makes the professional repair more expensive, not less. Paver and wall block work is heavy, repetitive, and easy to get subtly wrong in ways that show up a year later as a cracked patio or leaning wall. For foundation-level work on an ADU, you need a contractor who pulls permits and passes inspections, not a weekend project. If you’re seeing any of the signs above, call (432) 233-0976 and we’ll walk the site with you, usually the same week.
FAQs
With a properly compacted base and intact edge restraint, Belgard pavers last 30 to 40 years in San Antonio’s climate, while the interlock between them may need joint sand touch-ups every 5 to 7 years. The weak point is almost never the Belgard product itself; it’s the base and drainage underneath. Call (432) 233-0976 and we’ll tell you what condition yours are actually in.
In most cases yes, we can lift the affected section, re-compact the base, and reset the same pavers so the color match stays perfect. Full replacement only makes sense when the pavers themselves are cracked or the base has failed across more than half the surface. A written estimate will tell you which situation you have.
A bump-out addition typically runs 8 to 14 weeks, while a detached ADU with Belgard hardscape usually takes 4 to 7 months from permit to final walkthrough. San Antonio’s permitting office timing affects the front end more than any other single factor, and we file the paperwork as part of our scope.
We order Belgard pavers, blocks, and edge restraints directly through our supplier network, which means you get current production runs and we manage the delivery and storage on site. We don’t ask homeowners to source their own materials for load-bearing applications. Call (432) 233-0976 for a free estimate and we’ll price the exact Belgard products your project needs.
Written by Graham Stein, Owner, Elmstead Remodeling San Antonio at Elmstead Remodeling San Antonio, serving San Antonio and nearby areas.
