Tremron Home Additions & ADU Nationwide

Tremron Home Additions & ADU: The Mission Viejo Owner’s Guide

We stock and install Tremron-compatible hardscape materials for home additions and ADU projects in Mission Viejo, with typical installed pricing from $45,000 to $130,000 for additions and $90,000 to $220,000 for detached ADUs. Most Tremron paver and retaining wall components are available for next-day delivery from our Orange County suppliers, and we quote every job with a written price before work begins. Homeowners usually discover a Tremron material issue when pavers settle unevenly after winter rains, retaining walls show efflorescence (white mineral bloom), or the original contractor used thin-set bedding that cracked under Mission Viejo’s clay-heavy hillside soils.

Call (657) 297-4635

Which Tremron Models This Applies To

Tremron manufactures three product lines relevant to Mission Viejo home additions and ADUs: the Olde Towne cobble series, the Mega-Stone permeable paver, and the Sierra retaining wall system. The Olde Towne comes in 60mm and 80mm thicknesses; the 60mm works for pedestrian patios, while the 80mm is rated for driveway loads if your ADU includes a parking pad. Mega-Stone, at 3.15 inches thick with built-in spacers, is specified when the city requires permeable coverage to meet stormwater runoff rules.

To identify your existing Tremron product, flip a loose paver and check the molded stamp on the bedding face, which shows the series name and manufacturing date code. The Sierra retaining wall uses a pin-connection system, not adhesive; if your wall is leaning, the pins may have sheared or the base course may have washed out. We source OEM Tremron through their Anaheim distribution yard, though for some discontinued colors we match with Belgard or Techo-Bloc equivalents that interlock with the same profile. For Mission Viejo’s HOA-heavy neighborhoods like Painted Trails, color consistency matters; we pull from the same production batch and document the dye lot on your invoice.

Signs Your Tremron Home Additions & ADU Is Failing

• Pavers rock or wobble underfoot. This usually means the bedding sand has migrated through a failed edge restraint, or the original installer skipped the geotextile fabric layer that separates native clay from the aggregate base. In Mission Viejo, our winter rains saturate the hillside soils and turn skipped fabric into a pump station.
• White powder blooms on retaining wall faces. That’s efflorescence, calcium hydroxide leaching from the concrete mix; it’s cosmetic but signals moisture moving through the wall. If it persists after dry weather, the drainage aggregate behind the wall may be clogged with native soil.
• Steps or landings settle unevenly. Tremron step units require a poured concrete footer below frost line; Mission Viejo’s frost depth is minimal, but expansive clay still heaves footers that aren’t tied to the main foundation with rebar.
• Permeable pavers pond water instead of draining. The Mega-Stone’s aggregate bedding needs periodic vacuuming; if the joints are packed with silt from hillside runoff, the permeability rating drops and you get standing water.
• Retaining wall face cracks in a stair-step pattern. This indicates hydrostatic pressure behind the wall, often from a broken irrigation line or downspout dumping against the backfill. The Sierra system’s pin connections won’t hold against sustained water pressure.

Before

After

Replacement Cost & What’s Included

The range depends on three factors: access (hillside lots in Casta del Sol require hand-carrying materials), whether we hit native bedrock when excavating for the base course, and if the city requires a soils report for walls over four feet. Every quote includes the Tremron materials, bedding aggregate, geotextile fabric, edge restraints, and labor with a written scope. Under Clause 1 of the Haven Standard, that written price is delivered before anyone picks up a shovel. Our 365-Day Done Right Promise covers the installation; Tremron’s material warranty runs 25 years against manufacturing defects, which we register on your behalf.

DIY or Call Us?

You can safely check a few things: verify the stamped model name on a loose paver, measure the settled area with a tape, and photograph any cracks for documentation. What you should not do is pull retaining wall blocks to investigate drainage; the Sierra system relies on stacked weight and pin shear resistance, and disassembling it without proper bracing can release tons of backfill. Similarly, cutting pavers with a wet saw throws silica dust; we use water suppression and respirators as standard.

We’ve rebuilt three Tremron walls in Mission Viejo where the homeowner started the demo and found the drainage pipe crushed by tree roots, then couldn’t stabilize the remaining courses. Measure twice, then measure again - the lumber yard doesn’t give refunds. For a written price on proper repair or replacement, call us at (657) 297-4635.

FAQs