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Serving Larkspur, CA and surrounding areas. (415) 430-9873
A sunken patio, a tilted garage floor, or a walkway that slopes toward your house does not have to mean a full replacement. We lift and level existing slabs without tearing anything out, and we fix the drainage issues that caused the problem in the first place.
Foundation raising in Larkspur lifts a sunken or uneven concrete slab back to its original level by pumping material through small drilled holes to fill the void underneath - most residential jobs take two to eight hours and the surface is walkable the same day.
Larkspur homeowners deal with this more often than most. The clay-rich soils in Marin County expand when wet and shrink when dry, and that seasonal cycle gradually shifts concrete slabs on patios, walkways, and garage floors. Homes built in the 1950s and 1960s - which make up a large share of Larkspur's housing stock - were often poured on soil that was never properly compacted, which speeds up settling over time.
Foundation raising is a repair, not a full replacement. For homes that need more than a leveled slab - where the underlying structure itself needs attention - we also provide foundation installation for situations where a complete new foundation is the right answer.
When the ground under your foundation shifts, door frames go slightly out of square. If a door that used to close easily now sticks at the top, drags on the floor, or a gate swings open on its own, the ground underneath may have moved. This is especially common in Larkspur after a wet winter, when clay soils have swollen and begun to dry out.
Diagonal cracks in drywall or plaster that start at the corner of a window or door frame are a classic sign that part of your foundation has settled unevenly. The ones to watch are wider than a pencil line or growing over time. In Larkspur's older housing stock, these often appear in homes built on fill soil that was never properly compacted.
Walk around your home and look at any concrete near the foundation. If a patio slab or walkway slopes toward the house rather than away from it, rainwater is being directed toward your foundation instead of draining away. This is both a drainage problem and a sign the slab has shifted, and Larkspur's rainy winters make it worse every year.
If a gap is opening between your garage floor and the wall, or between a front step and the house, the slab has dropped relative to the structure. These gaps let water, pests, and cold air in - and they tend to grow over time if the underlying soil continues to shift.
We lift sunken slabs on patios, walkways, garage floors, driveways, and steps throughout Larkspur and Marin County. Before any hole is drilled, we walk the property and assess how water moves across the site - because a raised slab on a property with unresolved drainage will sink again. The Concrete Foundations Association consistently identifies poor drainage as the leading cause of recurring slab settlement, and our assessment process reflects that.
We offer both foam lifting and traditional slurry methods. Foam cures in about 15 minutes, adds almost no weight to the soil, and holds up well on Larkspur hillside properties where the ground is already under stress from slope and seasonal moisture. The slurry method costs less upfront and works well on flat lots with stable soil. We recommend the right method for your specific site, not the one that is easier to schedule.
When a slab is too cracked or deteriorated to raise, we also provide concrete footings and full replacement work for situations where lifting is no longer a realistic option. We will tell you honestly which category your slab falls into before any work begins.
Best for hillside lots, properties with ongoing drainage issues, and homeowners who need a fast return to use - cures in 15 minutes.
Best for flat lots with stable soil and budget-conscious homeowners where drainage is already well managed.
Best for settled outdoor slabs that have tilted away from their original position but are otherwise structurally intact.
Best for sunken garage floors or driveway sections that have dropped and created trip hazards or drainage problems near the home.
Larkspur averages about 40 inches of rain per year, nearly all of it falling between November and April. That wet-dry cycle causes the clay soils under older slabs to expand and contract repeatedly. Homeowners here often notice new unevenness in spring, after heavy rains have saturated the ground and the soil begins to dry out. If your home sits on one of Larkspur's hillside streets near Baltimore Canyon or on the slopes above Magnolia Avenue, that drainage picture is even more complicated - water moves fast on a slope and can erode the soil under a slab in ways that are hard to predict from the surface.
Older homes are especially prone to this. Much of Larkspur's housing stock dates from the 1940s through the 1960s, when soil compaction requirements were far less rigorous than they are today. Slabs poured on poorly prepared soil have had decades to settle, and the seasonal moisture cycle keeps the process going year after year. We work regularly in San Anselmo and Mill Valley where the same clay soil and hillside conditions create the same pattern of slab settlement.
If you are in Corte Madera, just over the Larkspur border, the soil profile and drainage conditions are nearly identical. The same approach applies: assess the drainage first, choose the right lifting method for the site, and address the underlying cause rather than just pumping material and hoping the result holds.
We ask a few basic questions about where the problem is, how long you have noticed it, and whether there are any cracks or gaps nearby. You will hear back within one business day. You do not need to know the technical details - just describe what you see.
We visit your property and walk the affected area, looking at the slab, checking drainage, and asking about your home's history. In Larkspur, we pay close attention to how water moves across the site. You receive a written estimate before any work is scheduled - no surprises on the bill.
The crew drills small holes, pumps the lifting material through them until the slab returns to level, then patches the holes with concrete filler and cleans up the site. Most residential jobs are completed in a single visit. You can walk on the surface the same day.
We walk you through what was done and point out the patched holes. If the slab sank because of a drainage issue, we explain what to do about the water so the repair lasts. Keeping an eye on the area after the first rainy season is a smart habit.
Free on-site estimate. Written quote before any work begins. We respond within one business day.
(415) 430-9873We do not drill a single hole until we understand why the slab sank. Raising a slab on a property with unresolved drainage is a short-term fix. Our site assessment includes a review of how water moves across your property - because that is what determines whether the repair lasts.
We work throughout Larkspur, Corte Madera, Mill Valley, and the surrounding area. The clay-heavy soils and hillside drainage patterns here are different from inland Bay Area communities, and we have done enough jobs in this zip code to know what to expect before we arrive.
Since founding in 2022, we have built our reputation in Larkspur and the surrounding Marin communities. Repeat work and neighbor referrals make up a meaningful share of our projects - which only happens when the first job holds up. You can verify our license through the{' '}California Contractors State License Board before signing anything.
Phone estimates for foundation raising are unreliable because the amount of material needed varies too much from job to job. We always walk the site before quoting, and the number we give you is the number you pay. There are no add-ons once the crew arrives.
The right foundation raising contractor does two things: lifts the slab and explains why it sank. Every job we do ends with a clear conversation about what caused the settlement and what, if anything, you should monitor going forward. That is the difference between a repair that holds and one you repeat every few years.
When a slab is too damaged to raise, a new foundation installation gives you a properly compacted, code-compliant base from the ground up.
Learn moreIndividual post and wall footings permitted and poured to current seismic standards for decks, additions, and retaining walls on Larkspur hillside lots.
Learn moreLarkspur's wet winters start in November and the clay soils are already moving. Call now or request a free estimate online and we will get you on the schedule.