Unilock Home Additions & ADU Nationwide

Unilock Home Additions & ADU: The West Palm Beach Owner’s Guide

We stock and install Unilock-compatible hardscape components for home additions and ADU projects in West Palm Beach, with typical installed pricing from $45,000 to $130,000 for full additions and $90,000 to $220,000 for detached ADUs. Most Unilock paver patio, walkway, and retaining wall integrations for these projects are spec’d and ready for crew dispatch within 48 hours of signed agreement. Homeowners usually discover an issue when settling pavers create trip hazards at new foundation junctions, or when drainage planes specified in the original Unilock design fail after Florida’s first heavy season.

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Which Unilock Models This Applies To

Unilock’s product lines integrate into home additions and ADUs through three primary systems, and identifying the right match matters for load-bearing specs and color retention.

Beacon Hill Flagstone and Richcliff handle pedestrian patio-to-slab transitions where the addition meets existing grade. Brussels Block carries vehicular loads for ADU driveway aprons and garage-adjacent pads. Concord Wall and Brussels Dimensional Stone manage retaining and planter walls where additions step down on sloped West Palm Beach lots, particularly common in the neighborhoods west of I-95 where the Lake Worth Drainage District terrain drops gradually.

To identify your installed system, check the paver underside for the Unilock logo and series stamp. Early 2010s installations sometimes used Sierra or Rivenstone, now discontinued. For those, we source compatible aftermarket profiles from Belgard and Techo-Bloc with matching dimensional specs and comparable 8,000 PSI compressive strength, or we can locate remaining Unilock inventory through our distributor network. The OEM-versus-aftermarket decision hinges on whether your addition requires exact color match to existing hardscape or allows for intentional contrast at the junction. We document both options in the written quote, with swatch numbers, so you can screenshot and compare before anyone picks up a tool.

Signs Your Unilock Home Additions & ADU Is Failing

• Settling or rocking pavers at the foundation line. The Unilock bedding course has compacted or washed out where the new addition slab meets the original hardscape, usually because the geotextile fabric was omitted or the base stone was insufficiently compacted in lifts during original construction. We see this most often on West Palm Beach additions built during the 2015-2019 rush, when crews skipped the 98% Proctor density spec to speed slab pours.
• Standing water against the addition wall after rain. The Unilock permeable joint material has clogged with Florida’s fine sand and organic debris, or the original drainage plane was pitched toward the structure rather than away. Left unaddressed, this drives moisture through stucco weep screed and into the addition’s sill plate.
• Chalky white efflorescence blooming across paver faces. Calcium hydroxide migration from the concrete base slab, accelerated by West Palm Beach’s combination of high humidity and rapid wet-dry cycling. On Unilock’s U-Cara and Series lines with faceted finishes, this collects in surface texture and becomes more visually pronounced than on smooth profiles.
• Retaining wall leaning or cracking at corner returns. The Unilock wall unit’s pin connection has sheared, or the aggregate backfill behind the wall has settled and eliminated the designed batter. This is structural. The wall is transferring lateral soil load to your addition’s foundation rather than absorbing it through its own mass and geogrid reinforcement.
• Paver color shift to pink or gray where exposed to afternoon sun. UV degradation of Unilock’s EnduraColor wear layer, which on south and west exposures in West Palm Beach can thin faster than the 25-year fade warranty assumes. The substrate concrete remains sound, but the aesthetic match to protected areas is lost.

Before

After

Replacement Cost & What’s Included

What drives the range: access for mini-excavator or hand-demolition, whether the addition foundation requires underpinning protection during excavation, and whether we’re matching discontinued Unilock colors that require special-order lead time. Every quote is a flat written price with line-item scope, delivered before any work starts. Under Clause 1 of the Haven Standard, that number does not change unless you sign a change order. Our 365-Day Done Right Promise covers the installation; Unilock’s material warranty covers manufacturing defects, which we handle as part of project closeout documentation.

DIY or Call Us?

There’s a clear line here, and it’s not about skill. It’s about what a homeowner can verify versus what requires load calculation and permit alignment.

You can safely check: whether the paver settlement is isolated to the bedding course or extends to the base stone (probe with a screwdriver; resistance at four inches indicates intact base, soft probing indicates undermining). You can also clear clogged permeable joints with a shop vac and re-sand with Techniseal polymeric jointing compound, available retail. Document before and after with photos, which is a habit we encourage.

Do not attempt: retaining wall reconstruction, regrading against a foundation, or any excavation within 18 inches of a load-bearing slab. These alter structural load paths and trigger West Palm Beach’s permit requirements for engineered fill and compaction testing. The Palm Beach County building department requires a licensed contractor for any retaining wall over four feet, and most addition-adjacent walls qualify. We’ve corrected three DIY wall failures in the past two years on Flagler Drive properties alone, each costing roughly triple the original professional quote after foundation repair was added.

Call (561) 475-3903 to schedule your free estimate. We’ll spec the Unilock component, identify any compatibility gotchas with your existing installation, and give you a written price you can compare.

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