Sakrete Home Additions & ADU Nationwide

Sakrete Home Additions & ADU: The San Francisco Owner’s Guide

We install Sakrete-compatible home additions and ADUs across San Francisco, with most projects falling between $53,100 and $153,400 depending on size, site access, and finish level. Homeowners usually find us after a first attempt stalls out: a foundation pour that cracked within a year, a Sakrete mix that cured weak, or an ADU shell that never got past framing because the original contractor walked. We’re an independent San Francisco remodeling company, not affiliated with Sakrete, but we work with their bagged mixes and pre-mixed products every week. If your Sakrete-based concrete work is failing, we can tell you within the first walkthrough whether it’s a tear-out or a repair.

Call (831) 480-4497

Which Sakrete Models This Applies To

We work with the full Sakrete lineup you’re likely to have on a San Francisco addition or ADU: High-Strength Concrete Mix, Crack-Resistant Concrete Mix, Fast-Setting Concrete Mix, Sand Mix, Mortar Mix, and their PSI-rated structural mixes. The gotcha most homeowners miss is the compressive strength rating. A Sakrete 5000 PSI mix cures differently than a 4000 PSI mix, and if the slab for your ADU was poured with the lower-PSI bag, you’ll see spalling and surface dusting within two or three wet seasons. That’s a San Francisco-specific reality: the fog, salt air, and saturated soil in neighborhoods like the Outer Sunset or the Richmond put constant moisture pressure on concrete. For any Sakrete product, check the printed batch code on the original bag or the invoice line item if you still have it. If you don’t, we can usually identify the mix by its aggregate size, color, and how it has weathered over time. When replacement is needed, we opt for OEM Sakrete mixes where the structural spec matters. For non-structural patching and topping work, we’ll sometimes spec a quality aftermarket equivalent like Quikrete or CTS Rapid Set, but we’ll show you both options with the data sheet before anything goes in the truck.

Signs Your Sakrete Home Additions & ADU Is Failing

• Crusty white efflorescence along the slab edge or stem wall. This is moisture migrating through the concrete and carrying salts to the surface. It’s common in San Francisco additions built without a proper vapor barrier under the slab, and it signals the mix is porous enough to keep absorbing water.
• Hairline cracks that widen after each rainy season. Sakrete mix that was over-watered on site loses compressive strength. What starts as a thin line in the summer becomes a quarter-inch gap by spring, and that lets water into the rebar.
• Soft, dusty concrete that you can scrape with a screwdriver. That’s a cure failure, usually from the crew skipping the curing step or pouring in direct sun on a hot day. The concrete never reached its rated PSI and will keep degrading.
• Door or window frames in the ADU that have shifted out of square. This is elevated beyond a surface issue: the foundation under those openings is settling unevenly. In fill-heavy parts of San Francisco, like the Marina or areas near Islais Creek, soil movement works on weak concrete relentlessly.
• A hollow sound when you tap the slab with a hammer. That’s delamination, where the top layer of the pour has separated from the base. It means the Sakrete was over-troweled or the surface cured before the core, and the top will eventually flake off in chunks.

Replacement Cost & What’s Included

For a full San Francisco home addition or ADU built properly from the foundation up, budget between $53,100 and $153,400. That’s the honest range. A smaller, code-basic ADU shell on flat, stable soil in the Sunset comes in near the bottom; a two-story addition with a new kitchen, bathroom, and foundation retrofit near the top. What drives the number: soil condition, excavation depth, whether your lot has crane access or hand-carry access only, permit fees, and the finish level inside. We give you a written price before any work starts, with every line item named, so there is no guesswork when the crew arrives. The written price includes the Sakrete mixes or equivalent structural materials specified, all forming and finishing labor, and cleanup. Our 365-Day Done Right Promise applies to the completed work: if a slab cracks or a wall moves in that first year, we come back and make it right. Call (831) 480-4497 and Graham will walk the site with you and write the price.

DIY or Call Us?

You can safely do this much yourself: watch for new crack lines after heavy rain, photograph them with a quarter for scale, and check that downspouts are directing water at least three feet from the foundation edge. What you should not do is mix and pour a structural Sakrete repair yourself. A failed ADU foundation or a cracked load-bearing retaining wall holds weight. The rebar placement, the moisture content of the mix, the curing protocol, and the connection to the existing concrete all have to be right in one shot. We have seen homeowners spend a weekend and several hundred dollars on a bagged mix patch that crumbled by the next spring. The honest recommendation is to call (831) 480-4497 before you buy the first bag. We’ll tell you what we’d do, even if the answer is that the repair can wait.