Tremron Home Additions & ADU Nationwide

Tremron Home Additions & ADU: The Santa Clara Owner’s Guide

We stock and install Tremron-compatible pavers, retaining-wall systems, and hardscape components for home additions and ADU projects across Santa Clara, with installed pricing for Tremron-integrated hardscapes typically running $45,000-$130,000 depending on scope. Most Santa Clara homeowners discover their Tremron system needs attention when settling pavers create trip hazards near the new ADU entrance, or when the permeable base they installed five years ago during the drought has compacted unevenly after our recent wet winters. In neighborhoods like Rivermark and the Old Quad, we’ve replaced Tremron Olde Towne pavers that shifted because the original installer skipped the geotextile separation layer, or swapped out cracked Sierra units where vehicle loads exceeded the 8,000 PSI rating.

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Which Tremron Models This Applies To

Tremron manufactures several product lines relevant to Santa Clara home additions and ADU hardscapes, and matching the right component matters for load rating and color consistency. The Olde Towne series, available in 60mm and 80mm thicknesses, is the most common paver we encounter beneath new ADU walkways; the 80mm version carries a vehicular rating that the 60mm does not. The Sierra line, with its larger format and beveled edge, typically appears in patio extensions off master-suite additions. For retaining walls adjacent to excavated ADU foundations, we see the Stonewall II and Lakeland II systems, both of which use a pinless interlock that fails if the base course isn’t leveled to within 1/8 inch over 10 feet.

To identify your Tremron product, check the spacer bars on the paver edge (Olde Towne has three narrow ribs; Sierra has two wider ones) or look for the stamped lot number on wall units, which Tremron prints on the rear face for color-matching future orders. We source OEM Tremron where color continuity with existing hardscape is critical, and specify equivalent Belgard or Techo-Bloc units when the original line has been discontinued or when the customer wants a documented upgrade in compressive strength.

Signs Your Tremron Home Additions & ADU Is Failing

• Pavers rocking underfoot or visible lippage between units. This usually means the bedding sand has washed out or the edge restraint has failed, often because Santa Clara’s clay-heavy soil expanded during the 2023-2024 rainy season and pushed the restraint inward. The paver itself is likely intact; the substrate is the problem.
• White efflorescence blooming across the surface. This salt deposit indicates moisture is moving through the paver from below, typically because the drainage aggregate was installed without the required 4-inch perforated pipe, or because the ADU downspout was tied into the hardscape bed instead of routed to daylight.
• Cracks radiating from corner loads or jack points. Tremron pavers rated for pedestrian use will crack under vehicle traffic or heavy equipment during the addition framing phase. We see this most often where the original scope was a walkway that later became a parking pad.
• Retaining wall leaning or stair-step cracking. The pinless interlock in Stonewall II and Lakeland II depends on mass and friction; if the geogrid wasn’t extended 60 percent of wall height behind the face, or if the ADU excavation undercut the surcharge zone, the wall creeps forward seasonally.
• Permeable paver surfaces ponding instead of draining. Tremron’s Permeable line requires a specific 3/8-inch clean stone reservoir beneath; if the installer used standard bedding sand or if roof runoff dumps sediment onto the surface, the voids clog and the system reverts to impervious behavior, which violates Santa Clara’s stormwater requirements for ADU impervious cover calculations.

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Replacement Cost & What’s Included

For Santa Clara home additions and ADU hardscape work involving Tremron products, our installed pricing falls within the $45,000-$130,000 range for full-scope projects; isolated paver repair or wall reconstruction typically runs $3,500-$18,000 depending on square footage and whether we match existing color lots. What drives the spread: excavation depth (6 inches for pedestrian, 12 inches for vehicular), whether we need to recompact native soil or import engineered fill, and whether the Santa Clara building inspector requires a geotechnical report for walls over 36 inches.

Every quote is a flat written price with line-item breakdown: demolition and disposal, base preparation with documented compaction tests, Tremron or equivalent materials, bedding and joint sand, edge restraint, and the documented photo record of each layer before it’s covered. Under Clause 1 of the Haven Standard, that written price is delivered before any work starts. Our 365-Day Done Right Promise covers the installation; Tremron’s manufacturer warranty covers material defects, which we handle as a claim on the customer’s behalf.

DIY or Call Us?

An owner can safely check whether the edge restraint is visible and seated, whether downspouts are dumping directly onto the hardscape, and whether the lot number on any spare pavers matches the installed field. What you cannot safely assess: whether the base course is adequately compacted (requires a nuclear density gauge or certified plate compactor reading), whether the soil beneath is expansive enough to warrant geotextile separation, or whether a leaning retaining wall poses a collapse risk to the ADU excavation.

We do not recommend DIY removal of retaining wall courses or base excavation adjacent to a new addition’s foundation; the surcharge load and undermining risk are genuine, and Santa Clara’s building code requires a permit for walls over 36 inches anyway. Call (669) 259-1843 and we’ll schedule a free estimate with a written scope and price before any work starts.

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