Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
Belgard Home Additions & ADU: The San Diego Owner’s Guide
Adding a room, a second story, or a detached ADU to your San Diego home using Belgard hardscape and paver systems typically runs between $53,100 and $153,400 installed, with ADU construction ranging higher at $106,200 to $259,600 depending on square footage and site conditions. We install Belgard-compatible foundations, retaining walls, and paver elements as part of larger home addition and ADU projects, and we’re usually able to get a written estimate to you within a few days of walking the property. Most homeowners call us because they’ve got a failing retaining wall, shifting pavers, or drainage issues around an addition they’re planning or already have, and they want to know whether the Belgard product itself can be salvaged or needs replacement before framing starts.
Key Takeaways
- Installed price for a home addition in San Diego: $53,100 – $153,400, with ADU construction from $106,200 – $259,600
- Belgard products we work with: pavers, retaining wall blocks, and permeable paver systems used in foundations, walkways, and outdoor living areas tied to additions and ADUs
- Biggest failure point in San Diego: expansive clay soil shifting under paver bases and retaining walls, especially east of the 805
- Written price before any work starts: non-negotiable standard on every project
- We’re independent: Mason Remodeling Co San Diego is not affiliated with Belgard, but we install and repair their systems daily
Which Belgard Models This Applies To
Belgard doesn’t make a single “home addition” product. What homeowners actually need is compatibility across their paver lines, retaining wall systems, and permeable pavers, because these are what support and surround additions and ADUs. The big three we work with most in San Diego are the Belgard Mega-Arbel, Mega-Lafitt, and Dublin Cobble paver lines, plus the Anchor Highland Stone and Diamond Pro retaining wall blocks. Each has different joint widths and base depth requirements, and that’s where a lot of jobs go sideways. A Mega-Arbel paver is thicker and rated for heavier loads than a Dublin Cobble, so if you’re planning an ADU with a paver driveway approach or a retaining wall holding back a cut slope, you need the load rating matched to what’s sitting on it. The OEM-versus-aftermarket question for Belgard is simpler than most: use real Belgard blocks and pavers when the wall is structural or visible, because aftermarket color-match blocks from other manufacturers drift noticeably in San Diego sun within three to five years. For edge restraints and base materials, quality aftermarket equivalents are fine and save real money.
How to identify what you have: flip over a loose paver or look at the side of a wall block. Belgard stamps a product code and sometimes a date code into the mold. Write that number down before you call anyone. It tells us the exact series, the plant it came from (Belgard runs multiple regional plants, and color lots vary), and whether it’s still in production. If it’s discontinued, we’ll tell you straight and source the closest current match or find remaining stock through our supplier network. Isaac Pruett has pulled product codes off cracked retaining walls in Mission Hills and Lemon Grove enough times to know that the stamp saves a week of guesswork.
Styles & brands we work with
Signs Your Belgard Home Additions & ADU Is Failing
- Retaining wall leaning or bulging at the mid-point. This usually means hydrostatic pressure building behind the wall because drainage gravel or a perforated pipe wasn’t installed correctly, or the wall was built too tall for the block’s structural rating. In San Diego’s heavy winter rain seasons, this fails fast.
- Pavers sinking or separating around the addition’s foundation line. The base wasn’t compacted in lifts, or expansive clay soil swelled after a wet winter. You’ll see a visible dip where downspouts or AC condensate lines dump water.
- Cracks running through multiple pavers in a straight line. This follows a settling seam in the sub-base, often where a trench was cut for utilities and backfilled without compaction. It will keep spreading.
- Efflorescence or white chalky residue that keeps returning. Water is wicking through the paver from below, not just surface moisture. Cleaning it off without fixing drainage means you’ll see it again in months.
- Permeable pavers that puddle instead of draining. The joints are clogged with silt or the aggregate layers underneath are saturated. True permeable systems need periodic vacuum-sweeping and joint material replenishment, which almost nobody tells homeowners until it’s too late.
See the difference
Before
After
Before
After
Before
AfterReplacement Cost & What’s Included
For San Diego homeowners planning a Belgard-supported home addition or ADU, here are the numbers we quote most often. These are installed ranges, not just material prices:
| Project Type | Installed Price Range (San Diego) |
|---|---|
| Home Addition (full scope, including site prep and hardscape) | $53,100 – $153,400 |
| ADU Construction (detached, including foundation and site work) | $106,200 – $259,600 |
| Garage Conversion | $35,400 – $94,400 |
| Paver Patio Installation | $4,130 – $12,980 |
| Paver Driveway Installation | $8,260 – $21,240 |
What drives the range on additions and ADUs is mostly site work: soil condition, slope, retaining wall height, drainage requirements, and whether utility trenching runs through existing paver areas. A flat lot in Clairemont is a different job than a canyon-adjacent lot in Mission Hills. What’s included in our price: all Belgard materials, base prep, drainage, compaction, labor, and cleanup. What’s not included until we see the site: permit fees, engineering stamps if required, and any soil remediation. You get a written price before any work starts, every time, no exceptions. The work is covered by our 365-Day Done Right Promise: if it’s not right within a year of completion, we make it right at no cost to you.
DIY or Call Us?
Here’s the honest split. You can safely measure your existing pavers and wall blocks, take photos of the product codes, check for obvious drainage problems like downspouts emptying against the wall, and clear surface debris. Those are good homeowner moves and they help us quote accurately. What you should not do is rebuild a retaining wall, regrade under a paver base, or attempt any structural repair on a wall holding back soil. A retaining wall that fails in San Diego can drop hundreds of pounds of earth onto a walkway, a car, or a person. We’ve seen walls come down because someone pulled the bottom course to “just fix a couple blocks.” That’s not a repair, that’s a rescue. If the wall is over three feet tall, leaning, or showing cracks through the block itself, call us. Tell me what’s broken. I’ll tell you what it takes.
Call (619) 673-9302 and we’ll schedule a site visit, measure what you have, and give you a written price. No guessing, no open-ended estimates.
FAQs
Belgard pavers and wall blocks themselves are rated for 50+ years, but the base underneath typically lasts 15 to 25 years in San Diego’s clay-heavy, freeze-free but wet-winter climate. The pavers will almost always outlive what they’re sitting on unless the drainage is wrong. Call (619) 673-9302 if you’re seeing shifting or cracking, and we’ll tell you whether it’s a base issue or a product issue.
Yes, if the blocks are intact, the wall is straight enough to salvage, and the problem is drainage or minor settlement. We can pull the affected section, install proper drainage gravel and a perforated pipe, rebuild the courses, and recompact. If the blocks are cracked through or the wall has rotated more than a couple inches, replacement is the honest answer. Estimates are free either way.
Most paver repairs, drainage corrections, and small retaining wall rebuilds take one to three working days once we start. A full site package for a new ADU, including paver walkways and a retaining wall, runs two to four weeks depending on scope and weather. We’ll give you a written schedule with the written price, and we stick to it.
We keep common San Diego-area Belgard lines accessible through our supplier network, including Mega-Arbel, Mega-Lafitt, Dublin Cobble, and Anchor Highland Stone, and we can source specific product codes quickly for repairs. For larger additions and ADU projects, we order exact color lots to match existing work. We also work with KraftMaid, Cambria, and Silestone for interior finish packages when a home addition includes kitchen or bath space.
Written by Isaac Pruett, Owner, Mason Remodeling Co San Diego at Mason Remodeling Co San Diego, serving San Diego and nearby areas.
