Techo-Bloc Home Additions & ADU Nationwide

Techo-Bloc Home Additions & ADU: The Sherman Oaks Owner’s Guide

We install Techo-Bloc hardscape elements in home additions and ADU projects across Sherman Oaks for $45,000-$130,000, with paver patio, walkway, and retaining wall components typically quoted within 48 hours. Most homeowners discover an issue when settling cracks appear after the first heavy rain, or when pavers shift along the interface between an existing foundation and new ADU slab. In the clay-heavy soils near the Santa Monica Mountains foothills, we’ve seen Techo-Bloc Blu 80 mm pavers heave 3/4 inch in a single wet season if the base prep skipped geogrid.

Call (213) 221-0788

Which Techo-Bloc Models This Applies To

Techo-Bloc’s residential hardscape lines divide into three categories relevant to home additions and ADUs: the Blu series (60 mm and 80 mm thickness for pedestrian and light-vehicle loads), the Villagio line (textured surface, 60 mm, common for ADU courtyards), and the Mini-Creta retaining wall system (used for grade changes when an addition steps down a sloped lot in Sherman Oaks). The product code is stamped on the spacer nub of every paver, visible if you lift one edge. For retaining wall units, check the rear groove pattern: Mini-Creta has a single tongue-and-groove, while Mini-Creta Architectural has a double.

OEM Techo-Bloc replacement units match the original color blend exactly, but the dye lot fades differently in Southern California UV. We source current-production matches from Techo-Bloc’s Ontario, CA distribution yard, and when we’re bridging an old install to new work, we flag the color variance in writing before ordering. Aftermarket equivalents exist from Belgard and Keystone, but the dimensional tolerance differs by up to 1/16 inch. That gap telegraphs through on a tight-pattern patio. We keep Blu 80 mm in Sandalwood and Greyed Nickel on our truck for same-day patch work in Sherman Oaks.

Signs Your Techo-Bloc Home Additions & ADU Is Failing

• Edge restraint pulling away from the paver field. The PVC or aluminum edging that locks the perimeter loses its spike hold in decomposed granite base. In Sherman Oaks, this happens fastest on south-facing slopes where thermal expansion cycles the material daily. The pavers migrate outward, opening a gap that collects water and undermines the bedding layer.
• Efflorescence blooming across the surface. White calcium deposits indicate moisture is moving through the concrete body of the paver, carrying soluble salts. On Techo-Bloc’s smooth-finish lines, this masks the color variation that sells the product. It’s not structural failure, but it’s a sign the bedding sand is too wet or the vapor barrier below the base is compromised.
• Chipping at the spacer nubs. The nubs maintain joint width for sand interlock. When they break off, typically from freeze-thaw in the colder Sherman Oaks canyon pockets or from impact during adjacent construction, the joint opens and the paver loses lateral stability. Adjacent units start to rock underfoot.
• Retaining wall batter leaning forward. Mini-Creta walls are designed with a 3/8-inch-per-course setback. If the face plumbs vertical or bulges, the geogrid reinforcement has slipped or the drainage aggregate behind the wall is clogged with native clay. This is the failure mode we watch for on hillside ADU sites above Ventura Boulevard.
• Sinking along the addition foundation line. The transition between existing structure and new slab is the weakest point in any home addition hardscape. If the Techo-Bloc paver field drops more than 1/4 inch across a 4-foot level, the compacted base was either under-specified or disturbed by utility trenching that wasn’t properly backfilled.

Before

After

Replacement Cost & What’s Included

The range depends on three factors: access (narrow side yards off Dickens Street or Hortense require hand-carry and add labor), whether we hit buried irrigation or conduit that wasn’t marked on the original plans, and the base condition. If the original install skipped the 4-inch minimum of Class 2 base rock, we quote the correction in writing before touching a paver. Under Clause 1 of The Haven Standard, that written price is fixed. No change order, no surprise. Our 365-Day Done Right Promise covers the workmanship; Techo-Bloc’s limited lifetime warranty covers product defect.

DIY or Call Us?

What you can safely check: lift one paver at the failure edge and photograph the base layer. If you see mud instead of angular crushed rock, or if the bedding sand has washed to the bottom of the excavation, you’ve got a drainage problem, not a paver problem. Note the product code on the spacer nub and the approximate square footage affected.

Where DIY goes wrong: resetting pavers without plate compaction of the base. Walking them in by hand leaves voids that collect water and fail again in six months. Retaining wall rebuilds involve live loads from the soil behind the wall; deconstructing without temporary shoring has collapsed walls into occupied yards. And polymeric sand requires complete surface dryness before activation. One sprinkler cycle during cure locks haze onto the Techo-Bloc face that only grinding removes. If the scope is beyond a dozen units, call (213) 221-0788. We’ll photograph the base condition, quote the repair in writing, and schedule when you’re ready.

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