Belgard Home Additions & ADU Nationwide

Belgard Home Additions & ADU: The Los Angeles Owner’s Guide

Belgard home additions and ADU construction in Los Angeles typically runs $53,100 to $153,400 for a finished project, and the work usually takes 4 to 8 months depending on scope, foundation conditions, and the city’s permitting timeline. We install Belgard hardscaping products as part of larger addition and ADU builds: paver patios, retaining walls, walkways, and outdoor living surfaces that tie the new structure to the existing lot. Most owners call us after a previous contractor walked off a half-framed addition, or after a foundation inspection flagged a problem that no one priced into the original bid.

Call (903) 568-7222

If you already have a Belgard paver patio or wall that’s failing around your addition, or you’re planning an ADU and want the hardscape done right the first time, here’s the straight read on what’s involved in Los Angeles.

Key Takeaways

• Full home addition in Los Angeles: $53,100 – $153,400, depending on square footage, foundation work, and finish level.
• ADU construction: $106,200 – $259,600. Detached ADUs run higher than garage conversions ($35,400 – $94,400).
• Belgard paver patio or wall as part of the project: $4,130 – $12,980, priced separately from framing and interior work.
• Every bid is written. No numbers move at the door. That’s The Garrison Standard, and it’s non-negotiable.
• 365-Day Done Right Promise: if the hardscape or structural work fails within a year, we come back and correct it at no charge.

Which Belgard Models This Applies To

For additions and ADUs, the Belgard product line that matters most is their paver and wall systems, not a single “model” the way you’d think of a faucet or a cabinet line. The relevant series we work with on Los Angeles jobs include Belgard’s Mega-Arbel, Catalina, and Urbana pavers for outdoor living areas, along with the BelAir and Diamond wall systems for retaining walls and planter edges tied to the new structure. Each series has different bed depths, joint widths, and base requirements, and mixing them because “they looked similar at the yard” is how you get paver shifting six months after the ADU is signed off.

One compatibility gotcha we see regularly: Belgard’s permeable paver systems (Aqua-Bric, Eco-Bel) have different compaction and base specs than their standard interlocking pavers. If your Los Angeles addition triggers the city’s stormwater requirements, which it often does on lots with new impervious coverage, you may need permeable pavers. We check that during the bid phase so the permit doesn’t stall at LADBS plan check. For the hardscape, we recommend OEM Belgard products when you’re extending an existing patio or wall: the color lots and dimensions match what’s already in the ground. Aftermarket equivalents exist, but matching a 10-year-old color lot is a coin flip. We stock standard Belgard dimensions on the truck; special orders come out of the local Belgard distributor in the Inland Empire.

Signs Your Belgard Hardscape Is Failing

• Pavers sinking or “birdbathing” around the addition foundation. This is almost always a base-prep failure: either the subgrade was never compacted in lifts, or the contractor backfilled against the new foundation with loose soil. Water pools, and the pavers follow.
• Retaining wall leaning or bulging toward the new ADU. A wall more than 3 feet tall in Los Angeles needs proper drainage behind it and, depending on height, an engineered design. No drain rock, no weep holes, no wall. We see this constantly on hillside lots in Mount Washington and Echo Park.
• Pavers cracking along the edge of a new slab. Concrete and pavers move at different rates in Los Angeles heat. Without a proper edge restraint and expansion joint, the pavers take the stress and fail first.
• Sand washing out between joints after rain. Los Angeles gets less than 15 inches of rain a year, but when it comes, it comes hard. Polymeric sand that was never activated properly, or joint sand installed over a saturated base, washes out within one season.
• Wall caps lifting or separating. Caps are the first component to fail when the wrong adhesive was used, or no adhesive at all. Full reset of the cap course, done right, takes a day or two.

Replacement Cost & What’s Included

Here are the installed ranges for Los Angeles work we do around additions and ADUs:

• Paver patio installation: $4,130 – $12,980
• Paver driveway installation: $8,260 – $21,240
• Home addition (including foundation, framing, finishes): $53,100 – $153,400
• ADU construction: $106,200 – $259,600
• Garage conversion (incl. kitchenette/bath rough-in): $35,400 – $94,400

The spread comes down to lot access, soil condition, whether you’re tying into an existing foundation or pouring new, and what the permit requires. On a hillside lot in Los Angeles, caissons and retaining walls can add real money before the first paver goes down. Every bid we write separates line items: site prep, base material, Belgard product, labor, and warranty. You see the full number before we start. The 365-Day Done Right Promise covers the workmanship and the hardscape installation; the Belgard manufacturer warranty covers the pavers themselves, typically for a transferable lifetime on residential use.

DIY or Call Us?

You can do the inspection yourself. Walk the patio after a rain. Look for standing water, sunken pavers, or a wall that’s out of plumb. Grab a level and check the wall face. That’s safe and useful. What isn’t safe is pulling up a 20-foot run of pavers on a slope, or rebuilding a retaining wall that’s holding back a cut slope, without knowing what the base is doing underneath. A failed retaining wall above a Los Angeles street doesn’t just ruin your hardscape: it’s a liability issue. Same goes for any wall over 3 feet, which LADBS may have required to be engineered in the first place. If the wall is failing, the repair needs to match the original engineering. That’s not a weekend job. If you want an honest read on what’s failing and what it costs to fix, call (903) 568-7222 and we’ll put the number in writing.

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