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Unilock Home Additions & ADU: The Woodland Hills Owner’s Guide
Unilock home additions and ADUs in Woodland Hills typically run $45,000 – $130,000 installed, with full ADU construction reaching $90,000 – $220,000 depending on size, site conditions, and finishes. We work on Unilock-compatible addition and ADU projects and can usually assess your existing setup within a few days of your call. Most Woodland Hills homeowners call us because their Unilock paver patio, retaining wall, or driveway section has settled, cracked, or separated, and they want to know if it’s a simple re-level or a bigger structural problem before they plan an addition around it.
We’re an independent contractor in Woodland Hills, not affiliated with Unilock. That means we tell you straight what’s worth fixing, what needs replacing, and what the number looks like before anyone swings a hammer.
Key takeaways:
- Installed addition and ADU work in Woodland Hills: $45,000 – $220,000 depending on scope.
- Unilock paving failures usually trace back to base prep or drainage, not the paver itself.
- We inspect, quote in writing, and never change the price at the door.
Which Unilock Models This Applies To
We work across the Unilock range you’ll find throughout Woodland Hills: Brussels Block, Bristol Valley, Treo, Richcliff, Beacon Hill, and Estate Wall. The key Unilock-specific thing to know is that these pavers and wall units are manufactured to tight dimensional tolerances, which means a 6cm-thick Richcliff paver and a 3cm-thick Treo paver are not interchangeable even if they look similar from a distance. If you’re matching an existing Unilock installation, you have to identify the actual product line, not just “a gray paver.”
Here’s what we check on-site: the paver thickness (usually stamped or visible on an edge), the joint width (Unilock recommends 1/8″ for most lines), and the color blend name, which matters because Unilock runs color blends by region. A Beacon Hill “Sierra” from a SoCal supplier won’t match the same name from a different production run. We match OEM Unilock units whenever possible, but there are quality third-party equivalents for base materials, edge restraints, and joint sand that perform just as well. We’ll tell you when aftermarket makes sense and when it doesn’t.
Styles & brands we work with
Signs Your Unilock Home Addition or ADU Site Is Failing
These are the symptoms we see on Woodland Hills properties before a planned addition or ADU project goes sideways:
- Settling dips in paver driveways or patios. Almost always a base failure. In Woodland Hills, expansive clay soil and the freeze-thaw cycles up in the hills above Topanga Canyon Boulevard compress a weak base within two or three seasons. The pavers themselves are usually fine.
- Separating joints or creeping edges. Missing edge restraint is the culprit. Once a paver field loses its perimeter hold, the whole thing starts migrating outward under vehicle or foot traffic.
- Efflorescence (white chalky film). Natural and common on Unilock pavers, but if it reappears after cleaning, the paver is pulling moisture from a drainage problem underneath.
- Cracked or chipped units along a retaining wall. Often a sign of freeze-thaw stress or lateral pressure from the slope behind. Wall units crack when the base settles unevenly or drainage behind the wall wasn’t installed correctly.
- Water pooling against the foundation line. This is the one that kills ADU projects. If a Unilock patio or walkway pitches toward the house instead of away, water is working on your foundation. Any addition or ADU plan has to fix this first or you’ll be chasing problems for years.
Replacement Cost & What’s Included
In Woodland Hills, you should plan on these ranges:
- Full home addition (Unilock-compatible site prep, foundation, framing, finishes): $45,000 – $130,000
- ADU construction (permitted, standalone or attached): $90,000 – $220,000
- Paver patio replacement or new install: $3,500 – $11,000
- Paver driveway replacement: $7,000 – $18,000
- Garage conversion (includes site and paving work): $30,000 – $80,000
What drives the range: square footage, slope correction, drainage work, paver thickness, wall height, and whether you’re matching existing Unilock product or starting fresh. Every quote we write in Woodland Hills is line-itemed: base materials, pavers, labor, drainage, and disposal. You get the number before work starts, and that’s the number on the invoice. Our work carries the 365-Day Done Right Promise, so if something we installed fails within a year, we fix it.
See the difference
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AfterDIY or Call Us?
You can safely check a few things yourself: identify whether your Unilock pavers are loose (walk the joints and look for rocking), mark any settling spots, and check whether your downspouts dump water near the failed area. That’s useful information for us.
What you shouldn’t do is start pulling pavers and relaying them without checking the base depth, especially on a site you’re planning to build on. A paver job that looks flat on top can be sitting on four inches of uncompacted fill, and we’ve pulled apart enough “I did it last weekend” repairs in Woodland Hills to know the pattern: it fails again in one season. If you’re planning a home addition or ADU, the base and drainage work has to be done right the first time because there’s a structure going on top of it. The only thing worse than a failed paver patio is a failed foundation under a new ADU. Call (341) 217-2776, tell us what you’re seeing, and we’ll schedule a look.
FAQs
Unilock pavers installed on a proper base in Woodland Hills last 30 – 50 years, but the base itself may need attention after 15 – 20 years, especially in clay soil areas. The paver outlasts the installation underneath it. Call (341) 217-2776 if you’re seeing settling or shifting, and we’ll assess what needs work before you build on top of it.
Yes, in most cases we can pull, re-grade, compact, and reset the same Unilock pavers as long as the units themselves aren’t cracked or heavily chipped. Repair is usually half to two-thirds the cost of full replacement. Call (341) 217-2776 for an exact quote, estimates are free.
A typical paver patio or driveway reset in Woodland Hills takes three to five working days; a full base rebuild with drainage correction can run one to two weeks. We give you a written timeline before work starts, and you get photo updates while the job’s in motion. Call (341) 217-2776 and we’ll give you a realistic date range for your site.
We keep common Unilock edge restraints, joint sand, and base materials on our trucks, and we order specific Unilock paver or wall units to match your existing color blend once we confirm the product line on-site. Matching takes a few days in the Woodland Hills market. Call (341) 217-2776 and we’ll identify what you have and get it ordered.
Get a Written Price Before Any Work Starts
We’re Sawyer Remodel Woodland Hills, and we’ve been working the West Valley for years. We stock parts for Unilock-compatible jobs along with material lines like KraftMaid, Cambria, and Silestone. Luca Romano learned the trade at Los Angeles Trade-Technical College and has spent two decades on foundation work, full kitchen overhauls, and the kind of addition projects where the details decide whether the house holds together for the next fifty years. We give you a live arrival time, photo updates before and after, and a written price before a single tool leaves the truck. The work tells you everything. We just make sure it tells the right story.
Call (341) 217-2776 to schedule your free estimate.
Written by Luca Romano, Owner, Sawyer Remodel Woodland Hills at Sawyer Remodel Woodland Hills, serving Woodland Hills and nearby areas.
