Tremron Home Additions & ADU Nationwide

Tremron Home Additions & ADU: The Walnut Creek Owner’s Guide

We stock and install Tremron-compatible hardscape components for home additions and ADU projects in Walnut Creek, with typical installed pricing from $45,000 to $130,000 for full additions and $90,000 to $220,000 for detached ADUs. Most Tremron paver and retaining wall orders arrive within 5-7 business days, and we coordinate delivery to your job site so material sits ready before our crew breaks ground. Walnut Creek homeowners usually discover a Tremron specification issue when their architect’s plans call for a Belgard or Techo-Bloc detail that conflicts with the Tremron palette already selected for the main residence, or when an existing Tremron walkway needs to be matched exactly for a new ADU entry in the Saranap or Lakewood neighborhoods.

Call (510) 686-6370

Which Tremron Models This Applies To

Tremron manufactures three product lines relevant to Walnut Creek home additions and ADUs: the Olde Towne paver series, the Mega-Lafitt retaining wall system, and the Stonehurst flagstone collection. The Olde Towne comes in 60mm and 80mm thicknesses, and the 80mm is what you’ll need for any driveway or parking court tied to an ADU garage conversion. The Mega-Lafitt wall units are sized at 6-inch height by 16-inch face length, but the corner units are 8 inches deep, not 6, a detail that throws off foundation projections if your architect specs from catalog drawings without ordering physical samples.

To identify your existing Tremron installation, look for the stamped “TREM” mark on the paver edge or the small cast code on the back face of retaining wall units. Color names like “Sierra” or “Oakbrook” are consistent across production runs, but the actual blend shifts with aggregate sourcing, so we always pull from the same production batch for Walnut Creek match jobs. We are an independent contractor, not affiliated with Tremron, which means we source through Tremron’s authorized distribution network in the East Bay and also maintain relationships with quality aftermarket equivalents when the OEM lead time doesn’t match your permit schedule.

Signs Your Tremron Home Additions & ADU Is Failing

• Paver settlement or lippage at the ADU threshold. In Walnut Creek’s clay-heavy soils, particularly in the alluvial flats near Treat Boulevard, Tremron pavers installed without proper base compaction will settle differentially under the concentrated load of an ADU’s daily foot traffic. The fix is not releveling the pavers, it’s removing them, recompacting the aggregate base with a plate compactor in 6-inch lifts, and reinstalling.
• Retaining wall leaning or bowing. The Mega-Lafitt system is a gravity wall design, meaning it relies on mass and interlock, not mortar. When we see a wall tilting toward an ADU setback line, it’s usually because the original installer omitted the 6-inch drainage aggregate behind the wall and the hydrostatic pressure is pushing the units forward.
• Surface spalling or freeze-thaw damage. Tremron’s concrete pavers are rated for California’s climate zones, but Walnut Creek sees enough winter nights below 40 degrees that de-icing salt use on ADU access paths will degrade the surface paste over three to five seasons.
• Joint sand washout between pavers. This is the early warning. Polymeric sand joints should hold for years; if they’re eroding after one rainy season, the bedding layer is too thin or the slope is directing runoff into the joint rather than across it.
• Color mismatch on repair patches. Tremron’s “Sierra” from 2019 is not the same pigment load as “Sierra” from 2024. We see this most often when a homeowner adds an ADU walkway and the contractor pulls current stock without checking the original batch code.

Before

After

Replacement Cost & What’s Included

The range reflects three variables: access to the Walnut Creek site (steep lots in the hills above Rudgear Road add labor hours), whether we need to match discontinued Tremron colors from salvaged inventory, and the structural complexity of tying new hardscape into existing drainage. Every quote is a flat written price with line-item breakdown, delivered before any work starts, under Clause 1 of the Haven Standard. Our 365-Day Done Right Promise covers the installation; Tremron’s material warranty covers manufacturing defects, which we handle as part of our standard documentation package.

DIY or Call Us?

There’s a honest line here. A homeowner can safely check the Tremron stamp code on an existing paver, measure the joint width with a tape measure, and photograph the drainage condition behind a retaining wall. What goes wrong is the base preparation. We’ve been called to Walnut Creek ADU projects where a well-intentioned owner rented a plate compactor but couldn’t achieve 95% Proctor density because the soil was too wet, or installed the bedding layer at 1 inch instead of the specified 1.5 inches, and the pavers telegraphed every irregularity within six months.

Retaining walls carry real structural liability, especially where an ADU setback is involved. A leaning wall that encroaches on a property line can trigger a Walnut Creek building department correction notice and stop your certificate of occupancy. For the actual installation, call (510) 686-6370. We’ll give you a written price, a written scope, and a photo record of what we find before we quote.

FAQs