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Unilock Home Additions & ADU: The Long Beach Owner’s Guide
Most Unilock home additions and ADU projects in Long Beach run between $45,000 and $130,000 when you’re adding real square footage to an existing foundation, with detached ADUs typically landing higher once utilities and permitting are factored in. We see homeowners discover they need this work when a permitted addition starts to separate at the roofline, when a conversion triggers a code violation, or when the original paver hardscape shifts and pulls away from the slab edge. The good news: we handle the full scope, from matching your existing Unilock pavers to tying new framing into the old roofline properly.
At Sawyer Remodel Long Beach, we’re an independent general contractor, not a Unilock dealer or affiliate. What we do is build home additions and ADUs that integrate with Unilock hardscape, and we know exactly how these products behave in Long Beach’s coastal climate.
Which Unilock Models This Applies To
The compatibility question on Unilock work isn’t about the paver model itself, it’s about how the addition ties into what’s already on the ground. We work with the full Unilock paver and wall lineup you’ll find installed across Long Beach: Brussels Block, Hollandstone, Beacon Hill Flagstone, and the Estate Wall collections are the ones we see most often on older Long Beach lots from Alamitos Heights to Los Altos. When you’re adding a room or an ADU to a property with Unilock hardscape, the two decisions that matter are whether your existing pavers get lifted and re-set or cut clean at the new foundation line, and whether the new slab gets edged with the same Unilock border unit.
Here’s the gotcha most people miss: Unilock color lots shift between production runs. If your pavers were installed more than five or six years ago, a fresh pallet of the same named product won’t match perfectly, even if the catalog photo looks identical. That’s not a defect, it’s manufacturing reality. We handle this by pulling clean salvage units from the area we’re cutting, then blending any new material from the least-visible edge. If you don’t do that, you end up with a patchwork driveway that screams “addition” from the curb.
OEM Unilock pavers versus aftermarket lookalikes: we spec genuine Unilock when the job calls for matching existing work, because the dimensional tolerances are consistent and the color blending is done at the factory. Aftermarket concrete pavers from local Long Beach suppliers cost about 20 to 30 percent less, but the height difference of a quarter inch or less can telegraph across an entire patio. For an ADU project where you’re laying new hardscape from scratch, a quality aftermarket unit is completely fine. For an addition that butts against existing Unilock, don’t cheap out on the match.
Styles & brands we work with
Signs Your Unilock Home Additions & ADU Is Failing
- Seam separation at the roofline: the new addition wasn’t tied into the existing framing with proper strapping or shear transfer, so thermal movement in Long Beach’s sun-to-fog cycles is pulling the two structures apart. You’ll see a widening gap where the addition roof meets the original wall.
- Paver settlement along the new foundation edge: the excavation for footings disturbed soil that ran under your existing Unilock patio, and the backfill wasn’t compacted in lifts before the pavers went back down. The edge drops, water pools, and the whole area slopes toward the new wall.
- Floor slope inside the new room: either the slab was poured with an improper grade or the framing wasn’t leveled to the existing house. In Long Beach, where many original homes are pier-and-beam on sandy soil, this shows up within the first year.
- Door and window bind: an ADU or addition that shifts slightly will bind doors and windows at the trim. This is structural movement, not humidity. If you can’t close the bedroom door without lifting, the addition is moving independently of the house.
- Ceiling cracks radiating from the marriage line: where new drywall meets old, continuous cracks that keep reopening after patching mean the addition is hinging at that seam. A proper joist overlap and shear panel should prevent this permanently.
Replacement Cost & What’s Included
In Long Beach, a permitted home addition generally runs $45,000 to $130,000 depending on square footage, whether you’re pouring new slab or matching an existing raised foundation, and how much Unilock hardscape needs to be removed and re-set. A detached ADU runs higher, $90,000 to $220,000, because you’re adding full utility runs, separate service, and often a new sewer lateral. A garage conversion sits between those at $30,000 to $80,000.
What drives the number most is foundation work and the existing condition of what you’re tying into. A 400-square-foot addition on a slab with clean access and a straight roofline is a very different job than a second-story bump-out over a 1940s bungalow with termite damage in the plate. We write the price before tools come out, so you’ll see the exact line items for demo, foundation, framing, roofing, electrical, plumbing, drywall, finish work, and your Unilock hardscape restoration. No change orders unless you change the scope. Every project carries our 365-Day Done Right Promise: if something isn’t right within a year, we make it right, in writing.
See the difference
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AfterDIY or Call Us?
A homeowner can inspect their own Unilock edge settlement safely: take a four-foot level, lay it across the pavers near the foundation line, and check for anything over a quarter inch of drop. You can also check your crawlspace for standing water or soft plate lumber after a rainy stretch. If you’ve got dirt showing you haven’t seen before, that’s worth knowing.
What you should not do is jack up framing, cut into load-bearing walls, or attempt to re-grade and re-set pavers along a failing foundation edge. Load-bearing demolition without a temp wall puts everyone in the house at risk, and a bad paver re-set just sinks again, wasting the material. We’d rather you call us at (562) 512-6480 before the problem compounds, because an addition that’s moving will only get more expensive the longer it shifts.
FAQs
A properly installed Unilock paver surface lasts 25 to 40 years in Long Beach’s climate, but the sand joints and base need maintenance every 5 to 7 years. Coastal moisture causes faster polymeric sand breakdown, so re-sanding will be part of your long-term upkeep. Call (562) 512-6480 if your pavers are sinking or the joints are washing out.
Yes, if the issue is caught early, most failing additions can be repaired by re-tensioning the connection between old and new framing, adding strapping, and re-grading the paver edge around the slab. If the foundation itself is moving, repairs get more invasive. We’ll give you an honest read during the free estimate.
Plan on 3 to 6 months for a garage conversion, 4 to 8 months for a home addition, and 6 to 12 months for a detached ADU depending on permit timelines with the city of Long Beach. We coordinate the permit process and keep you updated with photos at each phase.
We stock sand, base material, edge restraints, and salvaged Unilock units from the project site itself. For color matching on older installations, we order fresh Unilock product as needed and blend it with your existing units so the seam doesn’t show. Call (562) 512-6480 for a free estimate and we’ll tell you upfront what’s reusable and what isn’t.
Start With a Written Estimate
The work tells you everything. The rest is just talking. If you’ve got a Unilock hardscape tied to a failing addition, a garage that never got permitted, or an ADU plan you want priced honestly, call (562) 512-6480 and we’ll put it in writing before a single tool comes off the truck. Background-checked, uniformed techs, live arrival times, photo updates before and after, and a price in your hands before work starts. That’s how every project runs under The Relay Standard.
Written by Luca Romano, Owner, Sawyer Remodel Long Beach at Sawyer Remodel Long Beach, serving Long Beach and nearby areas.
