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Tremron Home Additions & ADU: The Orange County Owner’s Guide
If you’re sitting on a Tremron paver patio, driveway, or retaining wall and thinking about building on top of it, or next to it, the question isn’t just “can I add a room” — it’s “will the existing hardscape hold up while we do it.” Tremron pavers are dense, color-fast concrete units made in Florida and shipped nationwide. They’re common throughout Orange County, especially in Irvine, Mission Viejo, and San Clemente where 1980s and 90s tract homes often have original Tremron driveways that are now sandwiched between a house and a new ADU build. In Orange County, a home addition or ADU that involves working around, cutting into, or matching existing Tremron pavers typically runs $45,000–$130,000 depending on square footage, site access, and whether we’re tying new foundation work into the paver base. The part people don’t plan for is the paver itself: when an addition goes in, the old Tremron rarely survives unchanged. Most homeowners discover this the day the excavator shows up and the existing paver edge is four inches into the new footprint.
Penhallow Remodeling Orange County is an independent general contractor. We are not affiliated with Tremron, but we work with their pavers constantly in Orange County additions and ADUs, and we know exactly how they behave under new loads, trenching, and California’s expansive soil conditions.
Which Tremron Models This Applies To
Tremron makes dozens of paver lines, but in Orange County we see four families most often around home additions and ADUs: the Holland Stone series (rectangular, interlocking, common on driveways), the Olde Towne series (tumbled edge, used on patios and walkways), the Village Cobble line (smaller units, more joints, often used on pool decks), and the Mega Olde Towne (larger format for driveways and commercial edges). Each line has different joint widths, thicknesses, and base requirements. The Holland Stone is usually 60mm thick for driveways but only 50mm for patios. If you pull a paver and it measures 2 inches instead of 2.375 inches, you have a patio-grade unit under a driveway load, and that explains a lot about why it cracked.
For matching purposes, the critical detail is the color code and production lot stamped on the underside. Tremron fades in California sun, so a brand-new “Sierra” paver will not match a 15-year-old “Sierra” paver that has been bleaching since 2009. When we do additions in Irvine’s older neighborhoods near the Spectrum, we often pull pavers from a less visible section of the yard and reuse them at the new transition, then lay the new units in the hidden zone. That way the visible edge matches, and the new pavers have ten years to weather into place. OEM Tremron pavers are the only real option if you want a like-for-like match. Aftermarket lookalikes from local concrete yards are cheaper per square foot but their colorants are not the same iron-oxide blends Tremron uses, and the mismatch shows within one season.
Styles & brands we work with
Signs Your Tremron Home Additions & ADU Is Failing
Most Tremron problems show up before the addition starts, not after. Here’s what we see in Orange County when a Tremron surface is about to complicate a build:
- Low spots holding water after rain. Orange County gets occasional heavy winter rain, and a paver base that has eroded underneath will puddle. The cause is usually a failed sand bedding layer, not the paver itself. If water ponds near the foundation line, that area needs base rework before any addition can tie in cleanly.
- Edge pavers drifting outward. Driveway edges that wander toward the lawn or sidewalk mean the edge restraint (the plastic or concrete strip that locks the perimeter) has failed. Once the edge opens, the whole field loses interlock. This is a structural issue for an ADU pad, not a cosmetic one.
- Chipped or spalled pavers near the patio door. Tremron pavers are strong, but a paver that sits under a downspout or irrigation overspray for years gets surface spalling from freeze-thaw and salt. In coastal Orange County towns like San Clemente and Dana Point, salt air accelerates this. Spalled pavers are still load-bearing but they look rough, and if you’re already cutting that zone open for a new addition, it’s the cheapest time to replace them.
- Joint sand disappearing between pavers. If you can see gaps between Tremron units that used to be filled, ants and water are getting under the field. Weeds in the joints are the tell-tale sign. Losing joint sand means the pavers are shifting microscopically every time a car or person crosses them, and that movement transfers to any new slab poured against them.
- Visible cracks running across multiple pavers in a line. A single cracked paver is usually a bad unit or a point load. A line of cracks running through three or more pavers is a base failure underneath, often from tree roots or an old utility trench that settled. That line matters a lot if your addition footprint crosses it.
See the difference
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After
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AfterReplacement Cost & What’s Included
In Orange County, the full cost of a home addition or ADU project that includes Tremron paver demolition, base rework, and reinstallation runs $45,000–$130,000. That is the all-in range for the addition or ADU itself, with the paver work bundled into site prep and finish trade scope. If the pavers are only being cut, patched, and re-laid along a transition edge without new construction attached, that portion typically lands between $1,200 and $4,500 depending on how many linear feet of edge we’re rebuilding and how much base material has to be removed and replaced.
What drives the number: the condition of the base under the existing Tremron, the thickness and series of the unit you have, whether we can salvage and reuse existing pavers or need to order new OEM Tremron material, and how much trenching the new addition requires (plumbing, electrical, gas lines all cut through paver fields). We give you a written price before any work starts, and that includes the paver portion line by line. Our 365-Day Done Right Promise covers the paver reinstallation and base: if it settles, opens up, or fails inside that window, we come back and fix it at no charge.
DIY or Call Us?
Replacing a single Tremron paver that cracked is a Saturday job if you have a rubber mallet, a cold chisel, and some patience. Popping a paver out, adding sand, and resetting it is safe work. What is not safe or smart to DIY is cutting a paver field that adjoins a new foundation, re-grading base material to carry new loads, or tying a new ADU slab into a paver surface that has been moving for a decade. The danger here is not bodily injury, it is structural: a paver base that fails under a new addition means cracked perimeter concrete, a sinking pad, and a garage that stops draining away from the house. That is a much more expensive problem than the paver rework would have been on day one. Our advice: if the pavers are in the footprint or touching the new foundation line, bring in a general contractor who does both the addition and the hardscape. That way the paver work is part of the written scope, one number, one guarantee. Call Trevor Nash at Penhallow Remodeling Orange County at (424) 541-1701, and we’ll give you the number first, then pick up the tool.
FAQs
Tremron concrete pavers typically last 25 to 50 years in Orange County when the base is properly compacted and the joints stay filled; the pavers themselves rarely fail, but the base and joint sand need attention every 10 to 15 years, especially in neighborhoods with expansive clay soil like parts of Irvine and Lake Forest.
You can re-level sunken pavers by pulling them, adding sand, and compacting, but a cracked or spalled Tremron paver should be replaced rather than patched because any repair compound will weather differently than the surrounding concrete and look obvious.
The paver demolition, base prep, and re-lay at the transition edge typically takes one to three days depending on the scope, and we schedule it so the pavers are down before the final inspection closes out the project.
We keep a small stock of common Orange County Tremron color matches on hand for transition patches, but most jobs involving a full addition or ADU require a custom order matched to your existing color code and lot, which we handle as part of the written scope.
If you’re planning a home addition or ADU in Orange County and the existing Tremron pavers are going to be part of the picture, the worst time to find out they need base rework is after the concrete is poured. Call Trevor Nash at Penhallow Remodeling Orange County at (424) 541-1701 for a free estimate. We install around KraftMaid cabinetry, Cambria countertops, and Silestone surfaces regularly, and we’ll give you a written number that includes the paver work before we ever start digging.
Written by Trevor Nash, Owner, Penhallow Remodeling Orange County at Penhallow Remodeling Orange County, serving Orange County and nearby areas.
