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Techo-Bloc Home Additions & ADU: The Jacksonville Owner’s Guide
If you’re planning a home addition or ADU in Jacksonville using Techo-Bloc pavers, walls, or steps, the installed project typically runs $45,000 – $130,000 depending on square footage, foundation work, and the Techo-Bloc product line you choose. We stock Techo-Bloc-compatible materials and install them as part of full additions and ADU builds. Most Jacksonville owners reach out after discovering their existing outdoor surfaces or foundation edges have shifted, cracked, or sunk, and they want the new structure tied into Techo-Bloc hardscape that won’t fail the same way.
What you’re usually dealing with is one of three things: a failed base layer under existing Techo-Bloc units, an expansion joint that was never installed where the addition meets existing slab, or drainage that pushes water against the new foundation. We see all three regularly across Jacksonville neighborhoods, from Avondale to Mandarin, and the fix starts with getting the Techo-Bloc product matched correctly to the structural demands of an addition or ADU.
One thing to know before we go further: Elmstead Remodeling Jacksonville is an independent contractor. We are not affiliated with Techo-Bloc. We install their products because they hold up in Florida’s heat and rain cycles, but any warranty claim on the product itself goes through Techo-Bloc’s manufacturer channels, and we’ll help you file it if it ever comes to that.
Which Techo-Bloc Models This Applies To
Techo-Bloc makes several paver and wall lines that end up on Jacksonville home additions and ADUs, and they are not interchangeable. The most common we install are the Blu 60 and Blu 80 pavers, the Raffinato and Semma paver lines, and the Mini-Creta and Prescott wall systems. Each has a different thickness, joint width, and base requirement.
The compatibility gotcha most Jacksonville owners hit: Techo-Bloc’s Blu 60 is a 60mm paver rated for pedestrian and light vehicle use, while the Blu 80 is 80mm and rated for heavier loads. If your addition includes a driveway apron or an ADU with a parking pad, 60mm units will crack under repeated vehicle weight in Florida’s sandy soil unless the base is over-engineered. We check the paver thickness printed on the underside of any existing units before matching new material, because a 20mm difference changes the entire base spec.
The other decision is OEM Techo-Bloc versus quality aftermarket equivalents. For structural walls and steps, we recommend staying with Techo-Bloc’s own units because their color blends and lip geometry are hard to replicate well, and a mismatched wall cap looks wrong within six months of Florida sun fading. For base materials and joint sand, aftermarket polymeric sands from Techniseal or Alliance perform as well as Techo-Bloc’s branded options, and we’ll tell you when the savings are worth taking.
Styles & brands we work with
Signs Your Techo-Bloc Home Additions & ADU Is Failing
- Settling or sinking pavers near the foundation line. This usually means the base layer was not compacted properly, or the fill dirt against the new foundation washed out during Jacksonville’s summer rains. Water gets under the paver bed, erodes the base, and the pavers drop.
- Cracks running through pavers in a straight line. A straight crack almost always traces a joint where two different substrates meet, like where a new addition slab butts against an older patio. Without an expansion joint, the two surfaces move at different rates and the pavers take the stress.
- Wall leaning or bulging outward. Retaining walls around an ADU foundation or addition grade change fail when drainage behind the wall is missing or clogged. In Jacksonville’s clay-heavy soil, hydrostatic pressure builds fast after a heavy storm.
- Efflorescence or white chalky residue. This is salt and mineral migration through the paver, common in Jacksonville’s humid climate. It’s cosmetic at first, but repeated cycling means water is moving through the unit, and if it’s near a foundation line, that same water is going somewhere you don’t want it.
- Loose or rocking individual pavers. When the edge restraint fails, edge pavers start to shift. Gravity and foot traffic do the rest, and a loose paver at the edge of an addition walkway becomes a trip hazard for kids and pets within weeks.
See the difference
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AfterReplacement Cost & What’s Included
For a Techo-Bloc home addition or ADU in Jacksonville, the full project range is $45,000 – $130,000. That figure includes the structure itself, the Techo-Bloc hardscape tie-in, drainage, and finishing work. A garage conversion runs $30,000 – $80,000, and a full ADU construction starts at $90,000 and can reach $220,000 for larger units with kitchens and bathrooms.
What drives the range on the Techo-Bloc side specifically: paver thickness (60mm versus 80mm), wall height and whether it needs engineering, the condition of the existing base, and how much drainage correction the site needs. We give you a written price before any work starts, and that price lists materials by name, labor broken into stages, and no allowance line items. The 365-Day Done Right Promise covers the completed work: if it’s not done right, we make it right.
DIY or Call Us?
You can safely remove a single loose paver, check the thickness marking on its underside, and look at whether the base underneath is still solid or has turned to mush. You can also check for water pooling near the foundation after rain and note where downspouts discharge. That information helps us quote accurately.
What you should not do is start pulling up a paver bed that sits against a foundation wall, or dig behind a leaning retaining wall. You can compromise the drainage plane, and in Jacksonville’s soil, a compromised base next to a slab invites water under the foundation. Retaining wall work near a structure also involves lateral load calculations that go wrong in ways that are expensive to fix. If the issue is more than one loose paver, call us at (904) 643-6243 and we’ll take a look.
FAQs
Techo-Bloc pavers on a properly built base in Jacksonville typically last 25 – 30 years before the base layer needs rework, though Florida’s sun will fade the surface color within 8 – 12 years unless a sealer is maintained. The pavers themselves rarely fail; the base and edge restraints fail first. Call (904) 643-6243 if you’re seeing settlement or shifting, and we’ll assess whether it’s a repair or a rebuild.
Small areas of settlement can usually be repaired by lifting the affected pavers, re-compacting the base, and reinstalling the same units, as long as the pavers are not cracked and the edge restraint is intact. If the base failure is widespread or water has been running against the foundation, a larger rebuild is the honest fix. Call (904) 643-6243 and we’ll tell you which camp your job falls into.
A garage conversion typically takes 8 – 12 weeks, and a full ADU or home addition runs 3 – 6 months depending on permitting, foundation work, and the scope of the Techo-Bloc hardscape tie-in. We’ll give you a schedule with named days before work starts, and the crew works around your family’s quiet hours where possible.
We order Techo-Bloc pavers, walls, and steps directly from regional distributors that serve the Jacksonville market, which means most common lines are available within 1 – 2 weeks. We also work with KraftMaid, Cambria, and Silestone for interior finishes on additions and ADUs, so the whole project can move without waiting on material from multiple suppliers. Call (904) 643-6243 for a free estimate and we’ll check current stock on your specific Techo-Bloc line.
Written by Graham Stein, Owner, Elmstead Remodeling Jacksonville at Elmstead Remodeling Jacksonville, serving Jacksonville and nearby areas.
