Unilock Home Additions & ADU Nationwide

Unilock Home Additions & ADU: The Fort Lauderdale Owner’s Guide

Unilock home additions and ADU construction in Fort Lauderdale typically runs $45,000-$130,000 for standard additions and $90,000-$220,000 for detached ADUs, with Rowan Construction Group stocking compatible Unilock paver systems for integration with new foundation and hardscape work. We carry Unilock Beacon Hill Flagstone, Umbriano, and Richcliff series in our Fort Lauderdale warehouse for same-week installation on active addition projects. Most homeowners discover their existing hardscape needs replacement when settling cracks appear where the original driveway or patio meets the new foundation, or when drainage from the addition overwhelms older paver beds that weren’t engineered for the changed water flow.

Call (754) 254-7676

Which Unilock Models This Applies To

Unilock’s modular hardscape systems integrate with home additions and ADUs through three primary product families, and matching the right series to your project matters for both structural compatibility and warranty coverage.

The Beacon Hill Flagstone series, available in 60mm and 80mm thicknesses, is what we specify most often for Fort Lauderdale ADU walkways and connector patios. The 80mm profile handles the live-load transition where an addition’s HVAC pad or generator sits adjacent to pedestrian traffic. Umbriano carries a 0.5% water absorption spec that meets Florida’s strict wind-borne debris requirements when used as exterior flooring on raised additions, though it requires a poured concrete base rather than sand-set installation. Richcliff uses Unilock’s Reala technology, which casts from actual quarried stone, and the texture variation matters in Victoria Park where historic district guidelines sometimes restrict overly uniform synthetic appearances.

To identify your existing Unilock installation, look for the stamped manufacturing date and series code on the paver edge, usually visible where a corner has chipped or along a cut edge. The code format changed in 2019, so pre-2019 installations read “UNI-[series]-[plant code]” while newer runs include a QR traceability matrix. We also stock quality aftermarket equivalents from Belgard and Techo-Bloc when the original Unilock run has been discontinued, though we note the substitution in writing before ordering since color matching across brands varies by 10-15% in the Fort Lauderdale sun.

Signs Your Unilock Home Additions & ADU Is Failing

• Step cracking along the addition foundation line. This happens when the original paver bed was compacted to residential standard (98% Proctor density) but the addition’s backfill settled at a different rate. The Unilock surface stays intact while the substrate shifts, creating a shear line that widens during Florida’s wet season when the water table rises.
• White efflorescence blooming across the surface within six months of addition completion. Calcium hydroxide migration from new concrete foundations is the culprit, not a paver defect. In Fort Lauderdale’s humidity, this process accelerates, and standard washing often drives salts deeper into the porous faces of textured series like Richcliff.
• Ponding that didn’t exist before the addition was built. Unilock’s permeable pavers (Eco-Priora series) handle 28 inches per hour infiltration, but if your addition’s downspouts now dump onto a standard interlocking bed, the system overwhelms. We see this regularly in Coral Ridge homes where second-story additions concentrate roof runoff onto original ground-level patios.
• Chipping at the interface where the addition’s concrete slab meets the paver edge. Thermal expansion differs: concrete moves at roughly 0.000005 inch per degree Fahrenheit, while concrete pavers move at 0.000004. Over a 40-degree Fort Lauderdale summer day, a 20-foot run creates 0.012 inch differential, enough to spall edges if the expansion joint was omitted or filled with rigid mortar.
• Sinking within 3 feet of the addition perimeter. This indicates inadequate base extension, often from a contractor who compacted the original 6-inch base but didn’t carry it the required 12 inches past the new foundation. The Unilock surface is fine; what’s beneath it has liquefied under cyclic wetting from the addition’s changed drainage pattern.

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After

Replacement Cost & What’s Included

The range depends on three factors we spell out in every written quote: whether we’re removing and replacing existing pavers or starting from disturbed soil, whether the addition’s foundation requires a frost-protected shallow footing or standard stem wall (the former demands wider base prep), and whether your Fort Lauderdale lot sits on the limestone caprock that runs through parts of Victoria Park and Colee Hammock, where we sometimes hit refusal at 8 inches instead of the typical 6-inch base depth.

Every Unilock installation we perform includes a written scope with material quantities listed by series and color code, a 365-Day Done Right Promise under The Haven Standard, and the documented photo record showing base prep, compaction test results, and final layout before polymeric sand application. No change to that scope proceeds without a signed change order, which is the discipline that has kept our projects within a few percent of the agreed price since 2007.

DIY or Call Us?

There’s a clear line between what a Fort Lauderdale homeowner can verify and where professional installation becomes necessary.

You can safely check: whether the paver edge restraint is still pinned (lift one corner gently; if the whole row shifts, the spikes have corroded in our salt air); whether efflorescence wipes off with a dry cloth or is embedded; and whether ponding is localized to one low spot or follows the addition’s downspout path. These observations help us scope the job before we arrive.

Where DIY goes wrong: base compaction requires a plate compactor that delivers 3,000-5,000 pounds of centrifugal force, and hand-tamping achieves roughly 400 pounds. Without proper compaction, the Unilock surface will settle differentially within two rainy seasons. More critically, cutting pavers for integration with an addition’s foundation line demands a wet saw with diamond blade; dry cutting generates silica dust that settles in lungs, and Fort Lauderdale’s humidity makes respiratory protection less effective than manufacturers rate it. We carry the equipment, the dust suppression, and the workers’ comp coverage. Call (754) 254-7676 for a written estimate before renting tools you’ll use once.

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