Unilock Home Additions & ADU Nationwide

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

If you’re planning a home addition or ADU in Sacramento and want Unilock hardscape work folded into the scope, the installed price typically lands between $45,000 and $130,000 depending on square footage, foundation conditions, and how much paving or retaining wall work the design calls for. Unilock pavers and wall units ride on the same excavation, drainage, and base-prep discipline as the structure itself, so the brand gets matched to the full job rather than bolted on at the end. Most owners start asking about Unilock when they’re already deep into planning the structure and realize the driveway apron, patio, or courtyard needs to be specced so it doesn’t settle around the new foundation.

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Which Unilock Models This Applies To

Unilock’s catalog for Sacramento projects splits into two practical lines: the EnduraColor pavers (Richcliff, Courtstone, Town Hall) that hold up to our hot, dry summers, and the Estate wall units (Lineo, Brussels Dimensional) that see heavy use as ADU retaining walls and attached planter boxes. The compatibility gotcha with Unilock is that paver thickness is not universal across the line. Richcliff runs 60mm for pedestrian patios but you need the 80mm profile or a thicker base spec when the same paver carries vehicle traffic near a garage conversion. That one spec decision changes your excavation depth. Unilock is OEM-only in practice. There is no meaningful aftermarket equivalent for the units themselves, though sand, geotextile, and edge restraint come from third-party suppliers like Techniseal and Gator. Skip the generic box-store paver if you are matching an existing Unilock installation. Color blends like Sierra and Bavarian are Unilock-specific and a close match from another manufacturer will read as off in full sun. Curtis Lane can spot a mismatched blend from across a Pocket-Greenhaven backyard before he shakes your hand. The real fix is to pull a unit, take it to the supplier, and match the lot, not the catalog photo.

Signs Your Unilock Home Additions & ADU Is Failing

• The paver edge is sinking where it meets the new foundation. This is almost always a base-prep failure, not a Unilock issue. When an addition goes in, the excavation for footings disturbs soil at the transition point, and that soil keeps settling for a year or two. The fix is cutting back, re-compacting, and reinstalling with proper edge restraint.
• Water pools against the ADU slab instead of draining away. Sacramento’s clay-heavy soil expands and contracts through the wet and dry seasons. If the patio pitch was set before the structure went up, the final grade may now slope toward the slab. That’s a grading correction, not a paver swap.
• Wall units are leaning outward or showing a bulge in the middle. This means the geogrid or drainage column behind the wall wasn’t done to the unit height spec. A leaning Unilock wall gets worse through every rainy season. If left alone, the wall unzips gradually, one row at a time.
• Joint sand is washing out after every rain. Sacramento gets most of its rain in a short winter window. If the joints between pavers keep emptying out, the sand was either dry-lapped too aggressively or the joints exceed the width Unilock specifies for the unit. Polymeric sand re-lock is routine, but it has to be installed dry and cured correctly.
• Cracks running across the paver field in a straight line. Straight-line cracking points to a seam in the base, not a broken paver. It usually shows up where the original footprint and the new addition base meet. The right repair is to lift the field along that seam, re-compact, and reinstall once, rather than patching over it.

Replacement Cost & What’s Included

For a Unilock scope inside a Sacramento home addition or ADU, our written pricing lands in these ranges: an attached patio with proper base and drainage runs $3,500 to $11,000, a new paver driveway apron in front of a garage conversion runs $7,000 to $18,000, and retaining wall work for an ADU set into a sloped Sacramento lot can push past $25,000 once excavation, drainage, and engineering are counted. The full project range of $45,000 to $130,000 reflects how the hardscape and the structure are priced together, not as separate bids that leave the seams to chance. Our written quote breaks out materials, excavation, base depth, drainage components, and labor in separate lines. The price you read on the sheet is the price you pay. No change orders unless you add scope, and no re-price at the door. Workmanship carries our 365-Day Done Right Promise, meaning if the pavers settle or a wall shifts within the first year, we come back and correct it at our cost.

DIY or Call Us?

You can safely pull a few pavers, check the base depth under them, and measure whether you have 80mm units under vehicle areas and 60mm under foot traffic. You can also flush a garden hose through the drainage outlets behind any wall to confirm water is moving. What you should not do is rebuild a failing Unilock installation next to a new foundation and expect it to hold. Compaction near a slab edge, drainage behind a retaining wall, and transitions from the addition footprint to the older hardscape are where DIY paver work goes wrong, and Sacramento’s clay soil punishes the mistakes during the first storm. If the base has failed, the pavers have to come up anyway. At that point, it costs you more to patch than to do the repair correctly once. Call us at (279) 226-1509 and we will give you a written scope and a firm price before anything is touched.