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Serving Corte Madera, CA and surrounding areas. (628) 212-4120
Adding an ADU, converting a garage, or building an addition? We pour slab foundations that are engineered for Corte Madera's bay-mud soils and seismic zone - fully permitted from start to finish.
Slab foundation building in Corte Madera means grading and compacting the ground, installing a moisture barrier and steel reinforcement, and pouring a single thick concrete slab that serves as both the floor and the structural base of your structure - most residential projects take one to three days of active work on site, plus 28 days of curing before the slab can carry heavy loads.
Most homeowners call us when they are building an accessory dwelling unit, converting a garage into living space, or adding a room. In Corte Madera, where ADU construction has accelerated in recent years, slab foundation work is one of the most common concrete projects we handle. If your project also requires structural concrete at the perimeter or below-grade, foundation installation covers the broader scope of full residential foundation systems.
We visit your lot in person before giving you a written estimate, because Corte Madera's soil conditions vary enough from neighborhood to neighborhood that a phone quote is rarely accurate. A site visit takes 30 to 60 minutes and costs you nothing.
If you are planning a new home, an ADU, a detached garage, or a large addition, you need a slab foundation before any framing begins. In Corte Madera, where ADU permits have increased significantly in recent years, this is one of the most common reasons homeowners call us. No structure can be safely built without a proper foundation underneath it.
Hairline cracks in concrete are normal as it ages. But cracks wide enough to fit a coin into, diagonal cracks running from door corners, or cracks where one side sits higher than the other indicate the slab has moved or settled unevenly. In Corte Madera's lower neighborhoods where bay-mud soils are common, this kind of differential settling is not unusual in older slabs.
When a slab shifts, the house frame moves with it, and the first place most homeowners notice is doors or windows that suddenly stick, jam, or leave visible gaps at the corners. If the sticking started gradually over one or two rainy seasons, that pattern often points to soil movement beneath the slab responding to moisture changes.
If your floors feel damp, flooring materials are buckling from below, or you notice a persistent musty smell that worsens in winter, moisture may be moving up through the slab. In Corte Madera's wetter months, ground moisture levels rise, and older slabs without adequate vapor barriers allow that moisture into your living space year after year.
Every slab we pour includes site grading, soil compaction, a gravel drainage base, a California-required vapor barrier, and steel reinforcement sized for your load and soil conditions. The prep work underneath the slab is what separates a foundation that lasts 50 years from one that cracks in five. We do not skip those steps to sharpen a bid price.
For projects that involve connecting a new slab to an existing older structure, we bring specific experience working with Marin County's mid-century housing stock. Tying a new ADU or addition slab to a 1960s foundation requires attention to how the two structures move independently, and we account for that in the design. When the project scope grows to include a complete foundation system with grade beams or perimeter footings, our concrete footings service covers those structural elements as part of a coordinated scope of work.
We handle the permit application with the Town of Corte Madera's Community Development Department as part of every project. Permit review typically takes two to four weeks, and we build that into your schedule from day one so there are no surprises.
Best for homeowners converting a garage to living space or building a backyard ADU that needs a permitted, code-compliant floor system.
Best for homeowners extending their footprint with a new room that requires a slab tied carefully to the existing structure.
Best for homeowners building a new detached garage, workshop, or outbuilding that needs its own independent foundation.
Best for homeowners whose existing concrete floor no longer meets current requirements for the intended use of the space.
Corte Madera has two very different types of ground. The hillside neighborhoods on the western side of town sit on relatively stable soil. The flat, low-lying areas near the bay and Corte Madera Creek sit on bay mud and fill soils that were historically marshland. A slab design that works perfectly on one street can fail on another if the contractor does not account for the specific conditions under your lot. We assess every property before we design anything.
Corte Madera also sits close to both the San Andreas and Hayward fault systems, which means every slab we pour is designed to California's seismic requirements for this region, not a generic national standard. The steel reinforcement inside your slab is sized and spaced to give the concrete the ability to flex slightly during ground movement rather than crack straight through. The American Concrete Institute publishes the standards we follow for seismic reinforcement detailing.
Corte Madera's wet winters - most of the annual rainfall falls between November and March - create a narrow preferred window for pours. We plan schedules around dry conditions whenever possible, and when a project timeline falls into the shoulder season, we have a specific plan for protecting the work. Homeowners in Larkspur and Mill Valley face the same seasonal constraints, and we serve both areas alongside Corte Madera. San Rafael homeowners also reach us regularly for ADU and addition slab work under Marin County permit jurisdiction.
We come to your property and assess the site in person before quoting anything. We ask about your project scope, check soil access, and give you a written estimate within one business day of the visit.
We submit the permit application to the Town of Corte Madera's Community Development Department on your behalf. Review typically takes two to four weeks, and we keep you updated on where things stand so you are never left guessing.
Once permits are approved, the crew grades and compacts the ground, installs the gravel base, moisture barrier, and steel reinforcement. A building inspector must visit and approve the setup before any concrete is poured - we schedule that inspection automatically.
The concrete pour is typically a single long day of work. After that, the slab cures for 28 days. A final inspection is completed before framing can begin, and you receive full permit documentation to keep with your home records.
Free on-site estimates. We handle permits, inspections, and scheduling - you focus on your project.
(628) 212-4120Corte Madera's soils range from stable hillside ground to soft bay-mud fill, and a foundation design that works on one block can fail on another. We assess your specific lot before drawing up anything, so your slab is engineered for what is actually under your property. This is not standard practice for every contractor in the area.
We handle the permit application, plan submission, and inspection scheduling with the Town of Corte Madera from day one. Homeowners who hire contractors unfamiliar with the local process sometimes find themselves waiting weeks for corrections that could have been avoided. We know the process and build it into your timeline upfront.
Every slab we pour in Corte Madera includes rebar sized and spaced for the Bay Area's seismic requirements. The California Geological Survey's seismic hazard zone maps place Corte Madera in a high-risk area, and our designs reflect that - not a national average.
We have poured slab foundations for ADUs and garage conversions throughout Corte Madera and surrounding Marin County cities. Tying a new slab to a 1950s or 1960s structure requires a specific skill set, and the number of completed projects we have in this area means we have seen most of what Corte Madera's older housing stock can surprise you with.
Slab foundation work is one of the few home improvement projects where you genuinely cannot fix a mistake after the fact without major cost. Every decision we make is aimed at getting the design right before the concrete truck shows up, because that is the only time you can.
Full residential foundation systems including grade beams, perimeter footings, and raised foundations for homes throughout Corte Madera.
Learn moreBelow-grade concrete footings that carry the load of walls, posts, and columns safely down to stable ground in Marin County soil conditions.
Learn moreMarin County permit windows fill quickly in spring and summer - contact us now to lock in your timeline before the season gets busy.