Unilock Home Additions & ADU Nationwide

Unilock Home Additions & ADU: The Pomona Owner’s Guide

Unilock paver systems for home additions and ADU hardscaping in Pomona typically run $45,000-$130,000 for a complete installed project, with Unilock-specific material costs running 15-25% above standard concrete pavers due to their proprietary Ultima concrete technology and lifetime transferrable warranty. We stock Unilock Beacon Hill Flagstone, Bristol Valley, and Richcliff series in our Pomona warehouse for same-week availability on most ADU patio and walkway tie-ins. Most homeowners discover their Unilock surface is failing when settling cracks appear at the addition-to-existing junction, or when the permeable base beneath a new ADU walkway starts holding water instead of draining through.

Call (626) 606-1081

Which Unilock Models This Applies To

Unilock’s residential hardscape line splits into three tiers relevant to Pomona home additions and ADUs. The EnduraColor architectural series - Beacon Hill Flagstone, Bristol Valley, and Copthorne - carries a lifetime warranty and uses a two-layer manufacturing process where the color layer runs 3/8 inch deep, not a surface stain. The Classic series - Brussels Block and Hollandstone - is the workhorse for budget-conscious ADU walkways, typically 2-3/8 inch thickness versus the 2-3/4 inch spec on EnduraColor pavers. The permeable Eco-Priora line is code-required for any ADU driveway in Pomona’s stormwater management zones, identifiable by the 3/8 inch spacer nibs cast into every edge.

To identify your installed Unilock product, flip a loose paver and check for the molded “UNILOCK” stamp and a two-letter date code (BR for Bristol, BH for Beacon Hill). The color code is etched on the pallet label if you have leftover material. We source direct from Unilock’s Ontario distribution yard, 12 miles from Pomona, which means OEM color matches within the same production run. Aftermarket equivalents from Belgard or Techo-Bloc will not match Unilock’s dimensional tolerances - their 2-3/8 inch nominal is often 2-5/16 inch actual, which throws joint spacing on a repair. For additions where new pavers meet old, we always recommend staying OEM.

Signs Your Unilock Home Additions & ADU Is Failing

• Stepping stones feel loose or rock underfoot. This usually means the bedding sand has migrated through a failed edge restraint, or the open-graded base was compacted with a plate vibrator set too high and fractured the aggregate lock. In Pomona’s freeze-thaw cycle, which is mild but real at 1,000+ feet elevation near Phillips Ranch, that movement accelerates.
• White efflorescence blooming across the surface. Calcium hydroxide migration from the cement paste is normal for 90 days after installation; persistent efflorescence after two years signals water trapped in a non-permeable base beneath what should be a draining system. The paver isn’t failing - the drainage detail is.
• Cracks radiating from the addition foundation corner. Differential settlement between the existing structure’s footing and the new ADU slab is common in Pomona’s alluvial soil zones, especially north of the 10 Freeway. The Unilock surface cracks because the base moves, not because the paver is defective.
• Joint sand washing out after rain. Polymeric sand failure happens when installed on damp substrate or when the activation water was applied too aggressively. Unilock’s recommended Techniseal RG+ polymeric sand needs a completely dry 48-hour cure in Pomona’s spring humidity; we’ve seen crews rush it.
• Color mismatch on repair patches. Unilock’s EnduraColor fade resistance is rated at 0.5 Delta E over 10 years, but UV exposure on a south-facing ADU patio in Pomona’s inland heat will shift any concrete product. A repair with new stock against 8-year-old pavers shows the gap.

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Replacement Cost & What’s Included

The spread on these numbers comes down to three variables: access for mini-excavator or hand-dig, whether we hit unexpected utility shallow-buries common in Pomona’s older neighborhoods south of Holt Avenue, and whether the original base was built to ICPI spec or shortcut. Under Clause 1 of the Haven Standard, we deliver a written line-item price before any work starts, and no change proceeds without a signed change order. The 365-Day Done Right Promise covers settling, joint failure, or edge restraint pullout at no charge.

DIY or Call Us?

What you can safely check: lift one paver at the failure edge and measure the base depth. ICPI calls for 4 inches of compacted aggregate for pedestrian loads, 6 inches for vehicular. If you see less than 3 inches or standing water in the excavation, the base is underbuilt. You can also check the edge restraint - plastic spike-in type should have 8-inch spikes every 12 inches; missing or rusted spikes explain lateral drift.

Where DIY goes wrong: plate compaction is not optional, and the rental unit from the big-box store is usually a single-direction plate that won’t achieve 98% Proctor density. Without that compaction, the base settles in Pomona’s first winter rain cycle. More critically, cutting Unilock pavers with a wet saw throws silica dust even with water suppression; respiratory protection is mandatory, and most homeowners skip it. We bring HEPA vacuums and PPE as standard.

Measure twice, then we can talk. If the base is wrong, relaying the surface is a waste of your Saturday. Call (626) 606-1081 and we’ll give you a free written estimate with photos of what we find.

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