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Techo-Bloc Home Additions & ADU: The San Francisco Owner’s Guide
Techo-Bloc home additions and ADU construction in San Francisco typically run $53,100 to $153,400 for a full addition, and $106,200 to $259,600 for a detached or attached ADU, depending on square footage, site access, foundation work, and finish level. We stock and install Techo-Bloc hardscape products as part of the exterior scope on additions and ADUs in San Francisco, and we match wall blocks, pavers, and caps to your existing Techo-Bloc product line so the new work ties in clean. Most owners call us when they realize their existing Techo-Bloc patio, walkway, or retaining wall no longer matches the footprint of the addition they’re planning, or when a previous contractor left the hardscape roughed in and never finished it.
If you’re planning a home addition or ADU in San Francisco and the exterior hardscape has to move, get cut, get extended, or get rebuilt around the new foundation, that’s the work we do. We match Techo-Bloc series, color, and joint pattern so the finished site looks like one job, not two. Curtis Lane has worked San Francisco job sites for two decades, including a stretch of gut-and-rebuild projects in the Outer Sunset, where he learned exactly how fog-driven moisture moves through older balloon-frame walls and what that means for hardscape drainage and base preparation.
Which Techo-Bloc Models This Applies To
We work with Techo-Bloc’s full hardscape catalog for the exterior portions of home additions and ADUs in San Francisco: Blu 60, Blu 80, Industria, Borealis, Villagio, Brandon, Semma, and the Raffinato series for walls. The biggest compatibility gotcha we see is color-lot matching. Techo-Bloc runs change slightly between manufacturing batches, so if you’re extending a patio that was installed five years ago, the new pavers won’t be a perfect color match to the old ones unless you blend them. We pull from the existing field first, then add new units in a way that feathers the color transition so it reads as intentional, not patched.
OEM versus aftermarket: for Techo-Bloc, there isn’t a meaningful aftermarket equivalent. The product is the product. What matters is that the installer knows the series, the unit dimensions, the edge profile, and the recommended joint width for each line. Techo-Bloc wall systems also have specific cap sizes and setback requirements that change from series to series. Get the cap wrong and the wall looks like it was built by someone who didn’t read the cut sheet. We stock common Techo-Bloc wall caps and edge restraints on the truck, and we order full pallets for larger addition scopes so the color lot is consistent across the whole project.
Styles & brands we work with
Signs Your Techo-Bloc Home Additions & ADU Hardscape Is Failing
- Settling or sinking pavers near the new foundation. This usually means the base wasn’t compacted properly before the addition went in, or the excavation for the foundation disturbed the original base. Water follows the low spots and makes it worse.
- Gaps opening between the hardscape and the addition’s exterior wall. San Francisco’s clay soils expand and contract with seasonal moisture, and if the hardscape wasn’t tied to a proper edge restraint, it creeps away from the building.
- Wall caps that shift or twist. Techo-Bloc wall caps rely on a proper adhesive bond and correct setback. When they move, it’s usually because the wall behind them is moving, or the wrong adhesive was used.
- Water pooling against the addition’s foundation after rain. This is a grade problem. The hardscape should pitch away from the structure, and if it doesn’t, you’re inviting moisture into a brand-new foundation in a city where fog and rain already do enough damage.
- Crumbling paver edges along cut lines. Diagonal cuts, inside corners, and tight radius cuts put stress on the paver edges, especially in freeze-thaw or heavy foot traffic. If the cuts weren’t done with a wet saw and a steady hand, the edges start to spall.
See the difference
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After
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AfterReplacement Cost & What’s Included
For the hardscape scope tied to a home addition or ADU in San Francisco, expect $4,130 to $12,980 for a new paver patio, $8,260 to $21,240 for a paver driveway if the project includes one, and wall work priced per linear foot based on series and height. The big number on this page, $53,100 to $153,400 for the full addition, covers the structure; the Techo-Bloc scope is typically a separate line item within that project. Here’s the breakdown for the hardscape piece:
- Paver patio installation: $4,130 – $12,980
- Paver driveway installation: $8,260 – $21,240
- Concrete driveway installation (for comparison): $5,310 – $14,160
- Retaining wall / garden wall with Techo-Bloc units: priced per linear foot after site measure
Every price we give is written down before any work starts. That’s The Garrison Standard. No numbers that move at the door, no change orders that show up mid-job without your written approval. The 365-Day Done Right Promise covers the hardscape for a full year after close-out: if something shifts, settles, or fails inside that window, we come back and correct it at no charge.
DIY or Call Us?
You can safely check a few things yourself: look at whether water is pooling against the addition, check if joints between the hardscape and the foundation have opened up, and note where pavers have settled. You should not try to re-grade, re-base, or re-set Techo-Bloc units around a new foundation yourself. Cutting pavers around San Francisco’s tight lot lines, matching existing color lots, and getting the base compaction and drainage right on a sloped San Francisco lot is skilled work, and doing it wrong means doing it twice. Call us at (831) 610-5598 and we’ll give you a straight number for the hardscape scope. Straight number, real scope, no surprises at close-out.
FAQs
A properly installed Techo-Bloc paver patio or walkway in San Francisco should hold its grade and surface for 25 to 40 years, with the base being the limiting factor more than the paver units themselves. San Francisco’s clay soils and fog-driven moisture shorten that lifespan if the base wasn’t compacted in lifts and the drainage wasn’t set to move water away from the structure. The units themselves don’t rot or fail; the base moves. Call (831) 610-5598 and we’ll tell you if your base is the problem.
Yes, in most cases we can lift the affected area, re-compact and re-grade the base, adjust the edge restraint, and re-set the original units rather than buying new ones. That’s the most cost-effective path when the pavers themselves are still in good shape and the problem is settlement or drainage. If color-lot matching isn’t an issue because we’re reusing your existing pavers, repair is often the right call. Estimates are free.
For a typical San Francisco lot, the Techo-Bloc hardscape scope around a home addition or ADU takes three to seven working days once the foundation is set and the structure is weather-tight. The site access, the amount of cutting around existing structures, and the size of the paver field drive the timeline. We put the schedule in writing before we start, and we stick to it.
We keep common Techo-Bloc wall caps, edge restraints, and a rotating selection of pavers on hand for repairs and small tie-in scopes. For full addition or ADU projects where color-lot consistency matters across an entire pallet, we order direct from Techo-Bloc’s distribution channel so the whole project comes from one production run. That eliminates the two-tone patio problem before it starts.
Bradford Remodeling Co San Francisco is an independent remodeling contractor and is not affiliated with Techo-Bloc. We install Techo-Bloc products alongside our broader remodeling work, which includes general contracting, kitchen remodeling, and whole-home remodeling with documented brands like KraftMaid, Cambria, and Silestone.
Written by Curtis Lane, Owner, Bradford Remodeling Co – San Francisco, CA at Bradford Remodeling Co San Francisco, serving San Francisco and nearby areas.
