Unilock Home Additions & ADU Nationwide

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

Home additions and ADU construction in Miami typically run $53,100 to $153,400 depending on square footage, foundation work, and whether you’re adding a single room or a full accessory dwelling unit with plumbing and electrical. Unilock pavers and wall systems often anchor these projects: patios, walkways, retaining walls, and outdoor living spaces tied to the new structure. When a Unilock installation starts shifting, cracking, or separating from the addition, the failure usually traces back to base prep, drainage, or edge restraint, not the blocks themselves. South Florida’s rainy season and sandy soil put unusual stress on hardscape, and we see the same failure patterns repeat across Miami neighborhoods from Coconut Grove to the Falls.

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Key Takeaways

• Unilock hardscape tied to home additions and ADUs in Miami falls in the $53,100 – $153,400 installed range depending on scope.
• Most failures come from improper base compaction, missing edge restraint, or drainage issues, not the Unilock product itself.
• Mason Remodeling Co Miami is an independent contractor, not affiliated with Unilock, and installs Unilock-compatible systems across South Florida.
• We deliver a written price before any work starts, and every project carries a 365-day warranty.

Which Unilock Models This Applies To

Unilock produces three product families that most often show up in Miami addition and ADU projects: concrete pavers (the Umbriano, Brussels Block, and Richcliff lines), permeable pavers (Town Hall and Eco-Priora), and segmental retaining or freestanding wall systems (U-Cara and Lineo). The right product depends on what you’re building against. For a patio or walkway that drains toward an ADU foundation, you need a paver with a tight joint sand spec and proper slope, not just whatever’s on sale at a Miami supply yard.

Here’s the compatibility gotcha: Unilock’s dimensional specs vary by series, and you cannot mix thicknesses or joint widths without visible seams and eventual settlement. A Brussels Block paver is a different height than an Umbriano paver. If your existing installation is failing and you’re adding onto it, we match the original series by measuring a pulled paver rather than guessing. On the OEM vs aftermarket question, Unilock is the OEM manufacturer, and we specify their product when we’re extending an existing Unilock surface. For new work, we quote Unilock alongside Belgard or Techo-Bloc so you can compare line items against the same base and labor costs.

Signs Your Unilock Home Additions & ADU Hardscape Is Failing

• Pavers sinking or dipping near the foundation. This almost always means the gravel base wasn’t compacted in lifts, or water is washing sand out through a missing edge restraint. In Miami’s sandy soil, a poorly compacted base settles within two rainy seasons.
• Joint sand washing out after every storm. Miami’s afternoon downpours expose gaps in the perimeter. Without solid edge restraint, water channels through joints and erodes the bedding layer, leaving pavers loose.
• Weeds sprouting between pavers. Weeds don’t grow through Unilock blocks. They grow in joints where sand has washed out and organic debris has collected. It’s a drainage warning sign, not a cosmetic issue.
• Retaining wall leaning or bulging. If you built a Unilock wall as part of your addition’s grade change and it’s leaning, the wall is underbuilt for the soil behind it. Miami’s saturated ground adds lateral pressure most DIY walls aren’t built for.
• Patio or walkway separating from the addition’s slab. Differential settlement between the structure’s foundation and the paver base creates gaps that widen every season. Water follows the gap and accelerates the problem.

Replacement Cost & What’s Included

For a home addition or ADU project in Miami, your total cost lands between $53,100 and $153,400. That covers full construction: foundation, framing, roofing, HVAC rough-in, plumbing, electrical, drywall, finishes, and any Unilock hardscape tied to the build. A smaller addition like a single bedroom or office runs toward the bottom of that range. A full ADU with a kitchenette and bathroom runs toward the top or beyond it depending on finishes.

Here’s how the pricing breaks down on a typical Miami project:

• Home Addition (single room): $53,100 – $94,400
• Home Addition (multi-room): $94,400 – $153,400
• ADU Construction (full unit with kitchen/bath): $106,200 – $259,600
• Garage Conversion: $35,400 – $94,400
• Unilock Paver Patio (tied to addition): $4,130 – $12,980

Every Mason Remodeling Co Miami quote is a written line-item price before any work begins. No verbal estimates that grow. No change orders you didn’t approve. The work is covered by our 365-Day Done Right Promise: if anything isn’t right within a year of completion, we fix it at no cost. And if a repair or installation fails after that window, we still come back for a free second visit to make an honest assessment.

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