Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
Unilock Home Additions & ADU: The Tampa Owner’s Guide
If you’re planning a Unilock home addition or ADU in Tampa, you’re looking at a project that typically runs between $45,000 and $130,000, depending on square footage, site conditions, and finish level. We handle these projects from foundation to final trim, and we use Unilock pavers and retaining wall systems where they make structural and aesthetic sense. Most homeowners come to us after discovering that their existing patio, walkway, or retaining wall wasn’t built to handle Florida’s soil movement and drainage demands, and now the whole addition has to account for it.
The reality in Tampa is that the ground shifts. You get expansive clay in some neighborhoods, sandy soil in others, and a water table that doesn’t care about your plans. When a homeowner calls us about a Unilock addition, it’s usually because they’ve seen their existing hardscape start to heave, settle, or separate at the joints, and they know the new structure needs to sit on a base that won’t move. That means proper excavation, compacted sub-base, and edge restraint done right the first time, because fixing it after the fact costs more than doing it correctly up front.
Which Unilock Models This Applies To
Unilock makes a broad range of paver and wall systems, and not all of them are suited for every Tampa project. The product line breaks down into three rough tiers. The Estate Series (think Beacon Hill, Courtstone, and Richcliff) gives you that premium, textured look and holds up well under Florida sun and rain. The Artline Series is the smooth-faced contemporary look you see on modern ADU courtyards and pool decks. The Series 3000 and Town Hall lines are the workhorses for driveways and structural retaining walls.
The compatibility gotcha most people miss: Unilock pavers are made in multiple plants across North America, and the same product name can have slightly different dimensions or color blends depending on which plant produced it. If you’re matching an existing Unilock surface in Tampa and can’t confirm the original supplier, measure three paver widths and two lengths in millimeters, not inches. A 2mm difference between lots will show up as wavy joint lines. We handle this by verifying dimensions against Unilock’s current production specs before we order, and we never mix old and new stock on a visible surface without color-matching first.
One more Tampa-specific note: the freeze-thaw cycle that northern installs worry about isn’t our problem here. What is our problem is efflorescence, that white mineral haze that shows up on darker Unilock pavers after our wet season. It’s not a product defect, it’s soluble salts migrating through the paver. We account for it in material selection and can treat it if it appears on your current surface.
Styles & brands we work with
Signs Your Unilock Home Additions & ADU Is Failing
- Pavers settling or sinking in low spots. This almost always means the base wasn’t compacted properly or the original contractor skipped the geotextile fabric. In Tampa’s sandy soil, water moves through the base and washes fine material out, creating voids. The pavers drop to fill them.
- Joint sand washing out after every rain. If your paver joints are half-empty and you see sand collecting at the bottom of your walkway, the surface wasn’t sealed or the joints weren’t properly vibrated. Over time, pavers lose lateral support and start to shift.
- Retaining wall leaning or bulging outward. A Unilock wall holding back soil has a structural job to do. When it starts to lean, it’s usually because drainage behind the wall failed or the wrong wall system was specified for the soil load. This is a failing wall, not a cosmetic issue.
- Pavers cracking along a straight line. A clean, straight crack pattern often points to a settlement line in the sub-base, like a poorly compacted utility trench. The pavers are just mirroring what’s happening underneath.
- Color fading or blotchy patches on newer work. Efflorescence or repeated pressure washing with the wrong tip can strip the surface. Once the paver face is damaged, it won’t come back to factory color without replacement.
See the difference
Before
After
Before
After
Before
AfterReplacement Cost & What’s Included
A full Unilock home addition or ADU project in Tampa runs $45,000 to $130,000, and that range is driven by three things: square footage, whether you need new foundation work or are building on an existing slab, and the Unilock product tier you select. A detached ADU with a full bathroom and kitchenette sits at the top of that range. A bump-out addition with a paver patio and walkway tied into the existing structure sits at the lower end.
Every quote from Bradford Remodeling Co Tampa includes a written line-item breakdown before any work starts. That means you see the excavation number, the concrete number, the framing number, the Unilock material number (broken out by product line and square footage), and the labor number as separate amounts. You don’t get a single lump sum with a handshake. You get a document. And it doesn’t change after you sign it unless you change the scope first.
| Project Type | Typical Tampa Price Range |
|---|---|
| Home Addition (Unilock hardscape integration) | $45,000 – $130,000 |
| ADU Construction (detached, full build) | $90,000 – $220,000 |
| Garage Conversion (with Unilock walkway/patio) | $30,000 – $80,000 |
| Paver Patio Installation | $3,500 – $11,000 |
| Paver Driveway Installation | $7,000 – $18,000 |
Every project is covered by our 365-Day Done Right Promise. If work we completed fails inside one year, we return and correct it at no charge. That includes paver settlement, wall movement, or any other material or workmanship issue. The guarantee is in writing, with your signed copy handed to you at close-out, along with a documented scope of what was built and what materials went into it.
DIY or Call Us?
There are things you can check yourself. Walk the surface after a heavy Tampa rain and mark any spots where water pools instead of draining. Look for pavers that rock underfoot or joints that have gone empty. Check your retaining wall for any gap opening between the top course and the one below it. These are useful observations that help us diagnose faster.
What you shouldn’t do is start pulling pavers and rebuilding on your own, especially if the failure is structural. A retaining wall holding back three feet of soil can let go suddenly, and you don’t want to be standing next to it when that happens. Same goes for excavation around an existing foundation. If the base is failing, the fix is dig it out, re-compact, re-install. That’s heavy equipment work, and it needs to be done by a crew that understands drainage and soil behavior in Tampa. Curtis Lane has been building here long enough to know which neighborhoods sit on clay and which sit on sand, and that changes how we prep the base.
If you’re not sure whether your situation is a simple repair or a rebuild, call us at (941) 655-9297. We’ll give you a straight answer and a written price. No pressure, no re-pricing at the door.
FAQs
Unilock pavers themselves carry a transferable lifetime warranty against structural failure, and with a properly compacted base and edge restraint, a Tampa hardscape surface should last 25 to 30 years without major settlement. The weak point is almost never the paver, it’s the prep work underneath it. We build every base as if the next heavy rain is coming tomorrow, because in Tampa, it is.
It depends on what’s failing. Joint sand washout and minor surface settlement can be repaired by re-compacting and re-sanding without pulling every paver. But if the base was never properly built or drainage has been undermining it for years, spot repairs will fail the same way. We’ll tell you which situation you have before we quote anything. Call (941) 655-9297 for an honest assessment.
A typical addition runs 3 to 5 months from permit to final walkthrough. An ADU runs 5 to 8 months depending on utility connections and inspection timing. We give you a written schedule at contract signing, and we update you if anything changes. You won’t be chasing us for answers, and we don’t disappear mid-project. Reach us at (941) 655-9297 to get started.
We order Unilock pavers and wall systems per project so we can match your existing product’s dimensions and color lot, and we work with documented material specifications for every brand we install. We also install KraftMaid and Cambria cabinetry and Silestone surfaces, along with the full Bradford Remodeling Co Tampa material list. Ordering per project means you get the right product, not whatever was left over on a shelf. For a written estimate on your Unilock addition or ADU, call (941) 655-9297.
Written by Curtis Lane, Owner, Bradford Remodeling Co Tampa at Bradford Remodeling Co Tampa, serving Tampa and nearby areas.
