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Unilock Home Additions & ADU: The Los Angeles Owner’s Guide
If you’re planning a home addition or ADU in Los Angeles with Unilock hardscape materials as part of the package, the full project typically lands between $53,100 and $153,400 installed, depending on square footage, site access, foundation work, and finish level. A detached ADU with Unilock paving and retaining elements runs higher, usually $106,200 to $259,600, because you’re building a second structure from the slab up. Most homeowners discover they need us when a previous contractor’s work has failed, a foundation has shifted after heavy rain, or the city has flagged setbacks and drainage that weren’t handled right the first time.
The pattern we see across Los Angeles is consistent: someone gets an ADU quote that looks reasonable, the project stalls, and then they’re calling us to fix subgrade that wasn’t compacted, Unilock pavers that are sinking at the edges, or a retaining wall that’s leaning after two wet winters. We stock the common Unilock-compatible materials on our trucks and can typically have a site assessment scheduled fast. Call (254) 272-5876 for a free estimate and a written price before any work starts.
Key Takeaways
- Full Los Angeles home addition or ADU with Unilock hardscape: $53,100 – $153,400 installed.
- Detached ADU construction with Unilock materials: $106,200 – $259,600.
- We’re an independent contractor, not affiliated with Unilock. We install and repair Unilock products daily.
- Written price before work starts, 365-Day Done Right Promise, and background-checked technicians on every job.
- Free estimate: (254) 272-5876.
Which Unilock Models This Applies To
Unilock doesn’t make “home addition parts” in the way a faucet brand makes cartridges. What we’re talking about here is the full hardscape and structural package that goes into a Los Angeles addition or ADU: Unilock pavers, retaining wall block, coping, and steps. The compatibility question matters when you’re tying new work into existing Unilock surfaces, or when a previous install failed and you need to know if the existing material can be saved.
Unilock product lines that commonly appear in LA additions and ADUs include U-Cara wall panels, Estate Wall and Brussels Block pavers, and Thornbury or Richcliff for upscale driveways and patios. Here’s the gotcha: Unilock changes product availability regionally, and colors that were common in Los Angeles five years ago aren’t always in current production. If you’re matching an existing paver run, we need the original color code, batch number if possible, and a photo of the installed surface. A paver that looks gray in a photo can be one of four different Unilock blends, and none of them match perfectly across batches. For OEM versus aftermarket, Unilock pavers are the OEM in this case. There’s no meaningful “aftermarket equivalent” for a proprietary paver shape and color. What you can do is use a compatible paver from a different manufacturer for a contrasting border or accent, which we do regularly and it looks intentional rather than patched. But for seamless repair, matching the original Unilock product is the only honest option. We’ll pull the manufacturer specs for your lot and confirm current availability before we quote.
Styles & brands we work with
Signs Your Unilock Home Additions & ADU Hardscape Is Failing
- Paver edges sinking or “lipping” around the new structure. This is almost always a subgrade compaction problem. The soil under the pavers wasn’t compacted in lifts, or drainage wasn’t directed away from the addition. In Los Angeles, where we get long dry spells followed by heavy winter rain, the soil expands and contracts enough to wreck an uncompacted base in one season.
- Retaining wall leaning or bowing outward. Water is building up behind the wall. Unilock walls need proper drainage stone and a perforated pipe at the base. Skip that step and hydrostatic pressure pushes the wall over, especially in hillside neighborhoods like Silver Lake, Echo Park, and Mount Washington.
- Cracks running from the new foundation into the existing paver field. The addition’s footings may be settling at a different rate than the surrounding hardscape. This isn’t cosmetic. It’s a sign the foundation prep or soil report was incomplete, and it gets worse in LA’s expansive clay soils.
- Pooling water against the new structure after rain. Grade wasn’t pitched correctly. Water that sits against a foundation or paver edge destroys both over time. If your new ADU creates a pond at the back door every January, that’s a grading failure, not a quirky LA weather thing.
- Unilock steps or coping shifting, chipping, or separating from the structure. Steps move when the base fails or freeze-thaw (less common here, but real in higher elevations like the Santa Monica Mountains) works into gaps. Once a step shifts, the edges start chipping and it becomes a trip hazard.
See the difference
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AfterReplacement Cost & What’s Included
For a full Unilock-inclusive home addition or ADU in Los Angeles, you’re looking at $53,100 to $153,400 for the typical project. That range covers everything from a modest bump-out with a small paver patio to a complete attached addition with retaining walls, drainage, and Unilock hardscape tying it all together. A detached ADU, which requires its own foundation, utility runs, and compliance with LA’s ADU ordinance, runs $106,200 to $259,600.
What moves the number: foundation type (slab versus raised, and whether soil testing and piers are required), site access (a tight Los Angeles lot with no side yard means hand-carrying materials, which is labor), retaining wall height and engineering, and which Unilock product line you select. Brussels Block pavers run less than Richcliff. U-Cara walls are more than gravity stack block. We give you a line-item written price before the first tool is picked up, so you know exactly where every dollar goes. The number on the invoice is the number you approved. Every project carries our 365-Day Done Right Promise: if it’s not done right, we make it right, in writing.
DIY or Call Us?
There’s real work you can do yourself, and then there’s work that will cost you double when it fails. You can absolutely handle demolition debris removal, planter bed prep, and choosing your Unilock color palette. You can even do small paver repairs if you’re willing to do it slowly and carefully. What you should not DIY is anything involving foundation work, retaining walls over three feet, drainage design, or structural ties between the addition and existing hardscape. A retaining wall that fails in Los Angeles can send soil into a neighbor’s yard or compromise a hillside foundation, and that’s a liability you don’t want. Luca Romano has watched too many homeowners try to save money on a retaining wall and end up paying for an engineer, a permit, and a rebuild. If you’re unsure whether your situation is a weekend project or a foundation problem, call (254) 272-5876 and we’ll tell you straight, free, no pressure.
FAQs
With proper installation and drainage, Unilock pavers in LA last 25 to 40 years before they need resetting or replacement, and walls can go longer if the drainage behind them is maintained. The failure we see isn’t the product, it’s the prep. Bad subgrade kills pavers in five years or less. Good work, the kind we do, gets you the full lifespan. Call (254) 272-5876 for an honest assessment of your existing hardscape.
Yes, if the failure is localized and we can identify the cause. A small sunken area can often be lifted, the base recompacted, and the same pavers reinstalled. If the subgrade failure is widespread or drainage was never installed, a partial repair just moves the problem. We’ll tell you which situation you have before we quote. Estimates are free.
A paver repair or small wall rebuild typically takes 2 to 5 days on site. A full home addition or detached ADU with Unilock hardscape is realistically a 4 to 8 month project in Los Angeles, including permits, inspections, and construction. We give you a schedule in writing and photo updates throughout, so you’re never guessing where the job stands. Call (254) 272-5876 and we’ll walk you through a realistic timeline for your specific property.
We stock common Unilock wall block and paver lines on our trucks for repairs, and we order project-specific quantities and colors directly for full additions and ADUs. If you need a few matching Brussels Block pavers to fix a small section, there’s a good chance we have them on hand. If you need 1,800 square feet of Richcliff for a new ADU patio, we order it for your job and it arrives on our schedule, not on a mystery delivery window. Call (254) 272-5876 for availability.
Written by Luca Romano, Owner, Sawyer Remodeling at Sawyer Remodeling, serving Los Angeles and nearby areas.
