Tremron Home Additions & ADU Nationwide

Tremron Home Additions & ADU: The Sunnyvale Owner’s Guide

We stock and install Tremron-compatible hardscape and masonry components for home additions and ADU projects in Sunnyvale, with typical installed pricing for Tremron paver patios, walkways, and retaining wall systems running $3,500-$11,000 for patio work and $45,000-$130,000 for full home additions that integrate Tremron finishes. Most Sunnyvale homeowners discover their Tremron installation needs attention when settling pavers create trip hazards after winter rains, or when the permeable base beneath a Tremron driveway addition fails to drain during our January-March wet season, leaving standing water that stains the surface and undermines the bedding layer.

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Which Tremron Models This Applies To

Tremron manufactures several product lines relevant to Sunnyvale home additions and ADU hardscaping, and matching the correct series matters for both structural performance and color consistency. The Autumn Blend and Sierra paver series are common in Lakewood Village additions from the 2015-2020 build cycle, identifiable by the stamped model code on the spacer nub of each paver, typically reading “AB-[year]-[colorway]” or “SR-[series]-[thickness].” The Olde Towne cobble-style pavers, popular for ADU courtyard entries, carry a different edge profile and 60mm thickness versus the standard 80mm driveway spec.

We source OEM Tremron where color matching to existing hardscape is critical, particularly for phased additions where the original patio was installed five or more years ago and sun fading has shifted the tone. For new ADU pad work with no adjacent legacy surface, we often specify quality aftermarket equivalents from Belgard or Techo-Bloc that meet the same ASTM C936 spec for concrete pavers, at lower per-square-foot cost, with the tradeoff noted in writing before any order is placed. One compatibility gotcha specific to Tremron: their permeable paver line requires a 12-inch open-graded base, not the 6-inch dense-graded base used with standard interlocking pavers, and substituting one for the other voids the manufacturer’s drainage warranty.

Signs Your Tremron Home Additions & ADU Is Failing

• Pavers rock or wobble underfoot. The bedding sand has washed out from beneath the paver, usually due to failed edge restraints or insufficient joint sand that let water channel underneath during Sunnyvale’s concentrated winter storms.
• Standing water persists more than 24 hours after rain. The permeable base is clogged with fine sediment, or the original installer used standard bedding sand instead of ASTM C33 clean coarse sand, preventing drainage through the Tremron joint gaps.
• Efflorescence white film that returns after cleaning. Calcium hydroxide is migrating through the concrete matrix, common in Tremron pavers installed without a vapor barrier over clay-heavy Sunnyvale soils near Washington Park, where subsurface moisture remains elevated year-round.
• Cracked or spalled paver corners. The paver was installed without the required 1/8-inch joint spacing, or heavy vehicle loads exceeded the 80mm thickness rating on a driveway addition not engineered for that axle weight.
• Sunken or heaved sections near the addition foundation. Poor compaction of the aggregate base, or tree root intrusion from mature valley oaks common in older Sunnyvale neighborhoods, has displaced the substrate beneath the Tremron surface.

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Replacement Cost & What’s Included

What drives the range: access for excavation equipment, whether we match existing Tremron colorways or start fresh, and whether the original base was properly compacted to 95% modified Proctor density or needs full replacement. Every quote lists material costs, labor hours, and any subcontractor scope separately. Under Clause 1 of the Haven Standard, that written price is delivered before any work starts. The 365-Day Done Right Promise covers the installation, and the documented photo record shows base conditions before pavers go back down.

DIY or Call Us?

What a Sunnyvale owner can safely check: verify whether the paver model code is still legible on the spacer nub, measure the sunken area in square feet, and photograph the drainage pattern after a hose test. These three items let us price accurately over the phone before the site visit.

Where DIY goes wrong: lifting pavers without checking for utility lines beneath, reusing contaminated bedding sand that already contains the clay fines causing the failure, or compacting new base material in lifts thicker than 8 inches, which leaves soft spots that telegraph through within a season. Tremron pavers weigh 10-12 pounds each; a 400-square-foot patio is two tons of material to handle, stack, and relay square. For anything beyond a half-dozen loose pavers, the labor math usually favors a crew with a plate compactor and the right sand spec on the truck. Call (650) 405-3637 to schedule your free estimate.

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