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Oldcastle Home Additions & ADU: The San Antonio Owner’s Guide
Planning a home addition or ADU with Oldcastle materials in San Antonio typically runs between $45,000 and $130,000 for a full addition, and $90,000 to $220,000 for a standalone ADU. Elmstead Remodeling San Antonio works with Oldcastle-compatible masonry, pavers, and retaining wall systems on these projects, and we can usually have a written scope and price in your hands within days of the first walkthrough. Most San Antonio homeowners discover they need this page when an existing Oldcastle concrete paver patio, retaining wall, or segmental block wall has shifted, cracked, or begun to show drainage problems that a simple patch won’t fix.
We’re an independent remodeling contractor based in San Antonio, not a division or partner of Oldcastle. That matters because the advice here is built from jobs we’ve actually installed and repaired across the city, not from a product catalog.
Which Oldcastle Models This Applies To
Oldcastle’s product lines most relevant to San Antonio additions and ADUs include Belgium Stone, Holland Stone, and Coventry pavers for patios and walkways, plus Anchor and Diamond retaining wall blocks for grade changes, foundation terracing, and ADU site prep. If you’re matching an existing paver color after a failed section is pulled up, the lot number printed on the pallet label matters more than the series name, because color can vary between manufacturing runs. Take a photo of the underside of a loose paver before disposal; the mold code stamped there is what a supplier uses to verify a true match.
For retaining walls, the height of the wall determines which Oldcastle block line is appropriate. Walls under 3 feet can use most segmental block lines; anything over 4 feet in San Antonio’s shifting clay soils needs geogrid reinforcement and drainage gravel behind the wall, and that is structural work we always price as a full installation rather than a parts swap. When the question is OEM Oldcastle block versus a quality aftermarket equivalent, we have found the OEM paver is worth paying for when color matching an existing surface. For a brand-new project where the whole surface goes in at once, aftermarket concrete pavers from major Texas suppliers hold up comparably at a lower material cost, and we’ll show both options on the written quote.
Styles & brands we work with
Signs Your Oldcastle Home Additions & ADU Is Failing
- Pavers sinking in a low spot within 2 years of install. This almost always traces back to a base layer that was too thin or compacted when damp. In San Antonio’s alternating drought and downpour cycle, a 2-inch base fails where a 4-to-6-inch compacted base would have held.
- Retaining wall leaning or bowing outward at the middle. Water is collecting behind the wall and the hydrostatic pressure is pushing it. The fix is drainage gravel and a perforated pipe at the base, which means taking the wall down and rebuilding it properly.
- Efflorescence (white chalky residue) spreading across block faces. Moisture is moving through the block and leaving mineral deposits behind. It’s cosmetic until it isn’t: in freeze-thaw winters, that trapped moisture expands and can spall the face off the block.
- Pavers shifting side to side when you walk on them. Edge restraint has failed. Without a solid border holding the field in place, every rain event slowly pushes pavers toward the weakest edge.
- Cracks running in a straight line across multiple pavers. This pattern indicates a settlement seam in the soil below, often where a utility trench was backfilled or where tree roots are drying out the clay unevenly. Patching the surface only buys months.
See the difference
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After
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AfterReplacement Cost & What’s Included
Oldcastle paver patio replacement or repair in San Antonio runs $3,500 to $11,000 for a typical backyard surface, depending on square footage, existing base condition, and whether we can salvage and reset the original pavers. A retaining wall rebuild with Oldcastle block typically falls between $4,000 and $10,000 when we include drainage corrections. Full home additions using Oldcastle masonry elements sit in the $45,000 to $130,000 range, while ADU construction spans $90,000 to $220,000 depending on foundation needs, utility runs, and finish level.
Every quote from Elmstead Remodeling San Antonio includes the written price before any work starts, the block and base material, labor, haul-off of failed material, drop cloths and shoe covers inside the house, and a photo of the cleanup before the crew leaves. The 365-Day Done Right Promise covers the completed work: if it’s not done right, we make it right. No change orders appear after demo day because we write down the scope before a single tool leaves the truck.
DIY or Call Us?
You can safely check two things yourself. First, walk your paver surface after a heavy rain and mark any puddles that remain after an hour. Second, look at the bottom edge of your retaining wall for a white mineral line that tells you water is moving through the block. Both are useful diagnostics you can share over the phone at (432) 233-0976.
What is not safe for a homeowner is rebuilding a retaining wall over 3 feet. When a wall fails under load, the block can shift suddenly. A wall that holds back soil is under constant pressure, and releasing that pressure incorrectly can bring the entire section down on whoever is standing in front of it. The same caution applies to any paver repair that requires cutting block with a masonry saw. We use trained, background-checked crews for that work because a wet saw on San Antonio’s hard clay is a different animal than a YouTube video suggests.
FAQs
A properly installed Oldcastle paver patio on a compacted base with solid edge restraint lasts 20 to 30 years in San Antonio’s climate. Retaining walls with correct drainage typically last 25 to 40 years, and the block itself often outlasts the base and drainage components. Call (432) 233-0976 for a free site check if your surface is failing before the 5-year mark, because that signals an installation problem, not a product problem.
In most cases, no. Once a segmental wall has bowed or leaned, the block courses have already lost their interlock, and resetting the face without fixing what’s behind it just delays the same failure. The repair that works is a takedown, regrade, drainage install, and rebuild, which is priced as a single written scope rather than piecemeal fixes.
A standard 300-to-500-square-foot Oldcastle paver patio replacement in San Antonio takes 3 to 5 working days, including base excavation, compaction, and bedding sand. Retaining wall rebuilds run 5 to 10 days on average, and full additions or ADUs are scheduled out in phases we map for you before work begins. We’ll give you the working days count in writing with the price.
We do not stock Oldcastle block or pavers on the truck, because each job needs a specific series, color, and lot number matched to your existing surface. We confirm the exact product before the job starts, order from the local San Antonio supply yard, and have it delivered to your home the day we begin. We also work with materials from KraftMaid, Cambria, and Silestone on additions and ADUs where cabinetry and countertop surfaces are part of the scope.
If your Oldcastle home addition or ADU surface is failing, or you’re planning a new one and want the written price before any work starts, call (432) 233-0976. A live person answers, day or night. We’ll set up a walkthrough, write down the scope, and you’ll have the price in hand before you decide anything.
Written by Graham Stein, Owner, Elmstead Remodeling San Antonio at Elmstead Remodeling San Antonio, serving San Antonio and nearby areas.
