Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
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AfterUnilock Construction in San Antonio, CA | Barrett & Sons Construction
We provide independent Unilock hardscape construction and repair across San Antonio, including paver patios, driveways, walkways, and retaining walls. The one thing that makes our Unilock work different here comes down to caliche and clay: San Antonio’s shallow caliche hardpan and expansive black clay soils destroy paver bases that would hold up just fine in most other Texas cities. If your Unilock pavers are shifting, sinking, or separating, call Barrett & Sons Construction at (877) 610-1318 for a free estimate. We’re the crew that over-excavates, reinforces, and rebuilds so the job lasts.
Why San Antonio Residents Choose Us for Unilock Service
Tom Barrett founded Barrett & Sons Construction in 1998, and our crews have torn open and rebuilt dozens of Unilock hardscape installations across San Antonio‘s oldest neighborhoods since then. We know how Brussels Block pavers and Courtstone walls behave on caliche hardpan and expansive Vertisol clay, because we’ve dug into both more times than we can count. Tom grew up in the San Fernando Valley watching crews pour foundations on weekends with his dad, and he learned the trade at Los Angeles Trade-Technical College, starting with framing and finishing with enough field hours to know the job never lies. That background shapes how we approach every Unilock base, joint, and edge restraint we touch. We’re not the national outfit that quotes one price on the phone and shows up with another. We’re the local crew whose name is on the truck, whose permits get pulled, and whose price changes arrive in writing before a single paver moves.
We also carry Unilock sales & service depth that most San Antonio hardscapers don’t. When a Brussels Block paver cracks or spalls, we source genuine Unilock units from local distributors so the color and size match what’s already in your patio. For bases and drainage, we spec better aftermarket geotextile and open-graded aggregate, because Unilock’s own installation guide runs too conservative for our clay and caliche conditions.
Common Unilock Construction Problems We Solve in San Antonio
Here’s what we see when we pull up Unilock pavers across San Antonio’s urban core:
- Base layer failure from caliche hardpan. If the base isn’t over-excavated and recompacted, pavers shift and sink within two years. This is the single most common failure we see in San Antonio, especially in 78204 and 78207 where caliche sits close to the surface. Standard 4-inch bases just don’t hold.
- Joint sand migration during intense rain events. San Antonio’s feast-or-famine rainfall pattern means downpours hit hard after long dry spells. Joint sand washes out of paver gaps, leaving them open to weeds, ants, and paver loosening. We see this constantly in older Unilock installations across 78201 and 78202.
- Edge restraint failure on expansive clay soils. San Antonio’s clay shrinks and swells by several inches seasonally, and that movement pushes paver edges outward until soldier courses break. We rebuild edge restraints with deeper anchoring and flexible connectors that tolerate the movement instead of fighting it.
- Efflorescence and surface spalling from high-mineral irrigation water. Older Unilock units in the urban core, where irrigation water runs hard, develop white chalky mineral deposits and surface flaking. We treat the cause and replace units too far gone to salvage.
- Improper base prep over caliche block foundations. In pre-WWII homes along the 78201-78210 corridor, we often find caliche block or informal additions that complicate where and how a paver base should be laid. We fix what previous crews buried.
Unilock Service in San Antonio: What Local Conditions Mean for Your Equipment
The West Side’s deep caliche hardpan means standard 4-inch paver bases fail in under five years. That’s not a guess; it’s what we measure on tear-outs. Caliche is compressed calcium-carbonate rock, dense and irregular, and it doesn’t drain or compact the way crushed limestone does. When a paver base sits on top of it without over-excavation, water gets trapped at the interface, the clay beneath swells, and the pavers shift. We routinely over-excavate to 8 to 12 inches and install a geogrid reinforcement mesh that most local hardscapers skip, then top it with open-graded aggregate to handle both drought shrink and flood expansion. That’s the difference between a patio that lasts five years and one that lasts twenty.
Off Brazos Street in the Lavaca neighborhood, our crew pulled up a 20-year-old Brussels Block patio that had tilted toward the house after two decades of clay heave. We found the original builder had set the pavers directly on a 2-inch sand bed over undisturbed caliche, so water was pooling against the foundation. We over-excavated the caliche shelf, installed a 10-inch compacted aggregate base with a French drain tied to the downspout, and re-laid the cleaned pavers with new edge restraints. Now the patio sheds water and the house foundation stays dry. That’s a San Antonio Unilock job done the way it should have been the first time.
Unilock Models & Products We Service in San Antonio
We service and install the Unilock model lines most common in San Antonio: Brussels Block, Courtstone, Richcliff, and Beacon Hill Flagstone. For repairs, we use only genuine Unilock pavers and matching joint sand from local distributors, so color and size blend with what’s already on your property. For base material and drainage, we spec higher-quality aftermarket geotextile and open-graded aggregate, because Unilock’s own installation guide doesn’t account for San Antonio’s caliche and clay reality. We keep common Brussels Block and Courtstone units in local supplier rotation for fast turnaround.
Unilock Service Pricing in San Antonio
Here’s what Unilock work typically costs in San Antonio. These ranges reflect the over-excavation and reinforcement work most of our local jobs require.
| Service or Material | Price Range |
|---|---|
| Paver Patio Installation | $3,500 - $11,000 |
| Paver Driveway Installation | $7,000 - $18,000 |
| Driveway Replacement | $5,000 - $14,000 |
| Unilock Brussels Block paver (each) | $4 - $8 |
| Geogrid reinforcement mesh + open-graded aggregate base (per sq.ft.) | $5 - $9 |
What drives the cost in San Antonio is the base work. A patio that needs 8 to 12 inches of over-excavation because caliche sits shallow will cost more than one where the soil cooperates. Every estimate we write is free and comes as a line-item scope in writing. If anything changes during the job, you get a written change order before we proceed, not a surprise invoice at the end. Call (877) 610-1318 for your free estimate.
Serving San Antonio, TX - Our Local Coverage Area
We’re based in the San Antonio 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 - Unilock Construction in San Antonio
A concrete slab is a single rigid piece, so when the clay beneath heaves and shrinks, the slab cracks. A Unilock paver patio is made of individual units with flexible joints, so it can move without cracking, but only if the base and edge restraints are built to tolerate the movement. On San Antonio’s clay, a paver patio needs a deeper, reinforced base and flexible edge anchoring, or the pavers will shift, separate, and sink. Call (877) 610-1318 for an exact quote on your yard’s conditions. Estimates are free.
Yes, in most cases Brussels Block pavers can be cleaned and re-laid, which is exactly what we did on that Lavaca patio off Brazos Street. Some units may be too spalled or cracked to salvage, and we always replace a paver if it’s cracked or badly spalled, because repairs are only honest for minor chips that don’t affect structural integrity. We’ll tell you before the job starts which units can be reused.
That’s efflorescence, caused by mineral salts in the paver and the soil wicking to the surface as moisture evaporates. San Antonio’s hard irrigation water makes it worse, and it’s common on older Unilock units. It’s cosmetic in most cases and can be treated, but if the surface has begun to spall, those units need replacement, not treatment.
Yes, exterior alterations in Lavaca, King William, and Dignowity Hill fall under San Antonio’s Historic and Design Review Commission, so a new paver style counts as an exterior alteration that requires city approval before work starts. We handle the permit and HDRC submission as part of the job, because permits are not optional on our watch. Call (877) 610-1318 and we’ll walk through what your street requires.
Over-excavate. Caliche is dense and irregular, and it doesn’t drain like crushed stone. We excavate past the caliche shelf, compact the native soil, lay a geogrid reinforcement mesh, and build up with open-graded aggregate. Skipping that step is why so many San Antonio paver walkways sink within two years. For an exact scope on your property, call (877) 610-1318. The estimate is free.
Service Areas Near San Antonio
We serve San Antonio and the surrounding South Texas communities from our San Antonio service area hub. If you’re in the broader region, we also offer Unilock service in Dallas and Unilock service in Austin through our Texas crews.
Book Your Unilock Service in San Antonio Today
If your Unilock patio, driveway, or walkway is shifting, cracking, or draining wrong, call (877) 610-1318. We’ll send a Barrett & Sons crew out to look at your base, your soil, and your pavers, then hand you a written line-item estimate. We’ll do it right the first time, or we’ll come back and make it right.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving San Antonio since 1998.