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Cambridge Pavers Home Additions & ADU: The Austin Owner’s Guide
Building a home addition or ADU with Cambridge Pavers hardscape components in Austin typically runs $45,000 to $130,000, depending on whether you’re adding a single room or a fully independent dwelling unit. Most of these projects involve a mix of pavers, foundation work, framing, and hardscape integration, and we can usually get your project scoped and priced within a few days. The trigger point is usually obvious: you’ve outgrown your current footprint, or you bought a Cambridge pavers system years ago and now want the new addition to match the existing hardscape without a visible seam.
We see it constantly across Austin, from Mueller to Barton Hills. Someone added a paver patio ten years ago with a specific Cambridge color line, and now the new ADU needs the walkway, the pad under the unit, and the pathway to tie in so it looks like it was always there. The part people overlook isn’t the pavers themselves. It’s the transition pieces and edge restraints that fail first when a new structure settles on Austin’s clay-heavy soil.
Which Cambridge Pavers Models This Applies To
Cambridge produces pavers in three families that matter for Austin additions: the ArmorTec line (their higher-density commercial-grade paver, often used for driveways and ADU pads), the Ledgestone series (wall and fascia applications), and their standard Cambridge Pavingstones with ArmorTec interlocking series used for patios and walkways. The gotcha: Cambridge changed the mold dimensions on several paver lines around 2016. If your existing pavers were installed before that, the new ones from the same “color” won’t always lock in at the same depth. You need to measure the actual paver thickness, not just the face dimension. We carry a matching gauge on the truck for exactly this reason.
We’re an independent service provider, not a Cambridge Pavers dealer, which means we’re free to tell you when an aftermarket edge restraint or paver base actually performs better in Austin clay than the factory-specified option. We also install hardscape components alongside KraftMaid, Cambria, and Silestone interior materials when a project spans inside and out, which most ADUs do.
Styles & brands we work with
Signs Your Cambridge Pavers Home Additions & ADU Is Failing
- Visible sinking or lippage at the seam between old and new hardscape. Austin’s expansive clay expands and contracts more than most soils in Texas. The old paver field settles at a different rate than a new concrete or pier foundation, and the seam telegraphs it within two years.
- Edge restraints pulling away where the Cambridge pavers meet the new foundation wall. The restraint spike loses grip in disturbed soil, and the outer course of pavers starts drifting outward. It looks like a crack in the pattern, but it’s the restraint failing, not the paver.
- Standing water pooling in the new walkway after rain. The base under the new pour wasn’t graded to match the existing paver slope. Cambridge pavers are dense, but the base underneath is what drains. If the sub-base was cut short at the tie-in point, water pools right at the joint.
- Crumbling paver edges at the driveway transition. If the ADU addition added traffic load on an old Cambridge patio that wasn’t rated for vehicle weight, the ArmorTec line handles it, but the standard patio line doesn’t. The edges start breaking off within months.
- Color mismatch that gets worse with sun exposure. A new batch of Cambridge pavers will never match a ten-year-old field exactly, especially on a west-facing Austin exposure. We can blend from the existing field into the new area so the transition is invisible.
See the difference
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AfterReplacement Cost & What’s Included
For an Austin home addition or ADU that includes Cambridge pavers hardscape work, you’re looking at $45,000 to $130,000 for the full project. The hardscape portion alone, meaning the paver tie-in, base repair, walls, and walkways that integrate with the new structure, usually lands between $7,000 and $18,000 of that total depending on paver type, square footage, and how much of the old field needs to be lifted and re-set. Every price we give is written before any work starts. No verbal estimate that grows later. No surprise change orders.
The price includes the pavers, base material (we over-excavate and re-compact in Austin soil on every paver job), edge restraints, labor, and haul-off of the old material if any. We include a written line-item breakdown so you see exactly where every dollar goes. The 365-Day Done Right Promise covers the hardscape work: if the new pavers shift, settle, or crack within a year of completion, we come back at no charge and make it right.
DIY or Call Us?
You can safely check a few things yourself: look at the seam where new meets old and mark any stones that feel loose underfoot. Take a photo of the paver thickness at the edge. That’s useful information for us. But here’s where DIY goes wrong on an Austin addition: the base prep. If you lift and re-set Cambridge pavers on an improperly compacted base, you’ll get the same failure in eighteen months, and you’ll have paid for the material twice. The second common failure point is the edge restraint, which most DIY installs skip or under-spike.
This isn’t a dangerous job like a garage spring or electrical work. It’s a physics problem. The paver is just the top layer. What keeps it flat is the base, the restraint, and the drainage sloped away from the new foundation. Those three things are what we’ll fix. Call us at (903) 623-1966 and Isaac Pruett will come out, look at the actual seam, and tell you what it needs. “Tell me what’s wrong with it. We’ll figure out what it actually needs.”
FAQs
Properly installed Cambridge pavers in Austin last 25 to 40 years, with color fading on west-facing exposures being the first visible sign of age, usually around year 12 to 15. The base underneath fails before the paver does, which is why a paver that “broke” is almost always a base that shifted. Call (903) 623-1966 for a free estimate on any hardscape tie-in with your new addition.
You can re-set and re-compact existing Cambridge pavers if the units themselves aren’t cracked or crumbling, and in most Austin additions we repair roughly 60 to 80 percent of the old field rather than replacing it. If the pavers are chipped at the edges from vehicle traffic, or if the color has faded unevenly, full replacement of the damaged section is the better call. We’ll tell you which one saves you money, not which one makes us money.
The hardscape tie-in portion of an Austin home addition or ADU project typically takes 2 to 4 days once the foundation and framing are done, depending on square footage and how much old base needs to be removed and re-compacted. We’ll give you a written timeline with the written price, so you know what days we’re there and what days we’re not.
We keep the most common Cambridge ArmorTec and Ledgestone units in our Austin inventory, along with matching edge restraints and base materials, so we’re not waiting on a distributor for most jobs. For less common colors or older pre-2016 mold patterns, we order direct and the lead time is usually 5 to 10 business days. We’ll tell you the lead time before you sign anything.
Building an addition or ADU in Austin means your old Cambridge hardscape has to tie into the new structure without looking patched together. We do that work every month across Austin, from Mueller to Westlake, and we’ll put the price in writing before we move a single paver. Call (903) 623-1966 to schedule a free estimate. A live person answers, day or night.
Written by Isaac Pruett, Owner, Mason Remodeling Co Austin at Mason Remodeling Co Austin, serving Austin and nearby areas.
