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Serving Windsor, CA and surrounding areas. (707) 687-4808
A sunken driveway, patio, or walkway is a tripping hazard and a sign of a bigger problem underneath. We lift and level concrete slabs in Windsor without tearing everything out.
Foundation raising in Windsor is the process of lifting a sunken or uneven concrete slab back to its original level position - the crew drills small holes through the slab, pumps material underneath to fill voids and raise the concrete, patches the holes, and most residential jobs are finished in a single day.
If you have noticed a trip-edge between two driveway panels or a low spot where rainwater collects on your patio, those are the classic signs. The slab itself is often fine - the problem is the soil underneath. Windsor sits on the Santa Rosa Plain, where clay-heavy soils swell with winter rain and shrink back in summer. That seasonal movement creates voids beneath concrete, and once the support is gone, the slab drops. Lifting it is almost always faster and less expensive than tearing it out and starting over.
When the slab damage is too severe for lifting, concrete cutting is often the first step - removing the damaged section cleanly before a new pour. For situations involving the structural base of your home, our team also handles foundation installation work throughout Windsor.
One slab panel is noticeably higher or lower than the one next to it, creating a lip or gap. That raised edge is a tripping hazard and a clear sign the soil beneath has shifted. In Windsor, the clay-heavy soils of the Santa Rosa Plain make this kind of uneven settling especially common after a wet winter.
If rainwater or irrigation runoff collects in low spots on your driveway or patio instead of draining away, the surface has settled out of level. Standing water accelerates further soil erosion underneath, making the problem worse. This is a particularly telling sign during Sonoma County winters, when rain can be heavy and persistent.
When a concrete slab near your home settles, it can pull adjacent surfaces with it. If a side gate drags, a garage door threshold has a new gap, or a step has pulled away from the house, the slab underneath may have dropped. This is worth investigating before the gap grows large enough to let water into the structure.
If you tap on a concrete slab and it sounds hollow, or if you can see a gap forming between the slab edge and the soil, there is a void underneath. A void means the slab has no support and is at risk of cracking under load. In areas with active clay soils - common throughout Windsor - voids can develop faster than homeowners expect.
We offer two slab-lifting methods depending on your situation. Traditional mudjacking pumps a cement-and-soil slurry under the slab to fill voids and push the concrete back up. Polyurethane foam lifting injects an expanding foam through smaller drill holes - the foam cures faster, weighs less, and leaves smaller holes, though it typically costs more upfront. For Windsor's clay soils, the lighter weight of foam is often an advantage: adding heavy slurry over soft or unstable ground can sometimes cause further settling rather than solving it.
Before any lift, we assess the slab carefully - measuring height differences, checking for voids by tapping the surface, and looking at nearby trees, drainage patterns, and soil conditions to understand why the settling happened. Lifting the slab without addressing the root cause is a temporary fix. When we identify drainage problems alongside a settling slab, we discuss options to protect the repair, and for slabs connected to a home's structural base, our foundation installation team handles those more involved jobs separately.
Cost-effective for larger areas - suits driveways and wide patios where the soil underneath is reasonably stable.
Faster cure, smaller holes, and lighter material - suits homeowners who need quick turnaround or have soft, unstable soil beneath the slab.
Stabilizing slabs that have a void underneath but have not yet dropped significantly - suits preventive work before cracking begins.
Verification that the slab is truly level after the lift, with drainage review - suits homeowners who want documentation and a clear warranty.
The soils across the Santa Rosa Plain - where Windsor sits - contain a high proportion of clay. Clay expands when it absorbs winter rain and shrinks back during the long dry summer. That repeated swelling and shrinking gradually undermines the soil beneath concrete slabs, creating the voids that let slabs drop. Add in the seismic activity the North Bay experiences, and Windsor has a local environment that is genuinely hard on concrete flatwork. A contractor familiar with the region will know to look for seismic-related void patterns and to assess whether mature oak, redwood, or ornamental trees nearby have root systems working under the slab. Lifting without addressing active root intrusion or poor drainage is only a temporary fix.
We serve homeowners throughout Windsor and the surrounding Sonoma County communities where these same soil and weather conditions apply. Residents in Guerneville and Sonoma deal with the same clay-soil challenges, and we bring the same local approach to every job. For most standard residential slab-lifting jobs - a driveway, walkway, or patio - a permit is typically not required, but we will confirm requirements for your specific scope before work begins.
Call or message us and describe which slabs are affected, how much they have dropped, and whether there are cracks or drainage issues. We reply within one business day and schedule a free on-site assessment, because the scope really does depend on what we find underneath.
We walk the affected area, measure height differences between panels, and check for voids by tapping the surface and examining the edges. We also look at nearby trees and drainage patterns. After the evaluation, you get a written estimate explaining the recommended method and what the finished result should look like - no pressure, no guesswork.
The crew drills small holes through the slab at strategic points and pumps material underneath until the concrete rises back to level. The lift is monitored carefully and stops when the slab reaches the right height. Most residential jobs are finished in a few hours.
Once the slab is level, drill holes are filled and patched and the work area is cleaned. With foam lifting, you can typically use the surface within an hour or two. We walk you through what to watch for in the months ahead - particularly after Windsor's first wet season following the repair.
Free on-site assessment, written estimate, no obligation. Most jobs are done in a single day.
(707) 687-4808We have worked extensively across Windsor and the Santa Rosa Plain, where clay-soil movement drives most of the slab-settling we see. Understanding local soil behavior - not just the lifting technique itself - is what separates a lasting repair from one that re-settles after the next wet season.
We take careful measurements before and after lifting to confirm the slab is truly level - not just visually close. That verification step is the difference between work you can trust and work that just looks good on the day. We share those measurements with you as part of the job completion.
A contractor confident in their work backs it with a written guarantee. This matters especially in Windsor's active-soil environment, where a lift done without addressing the root cause can re-settle. Our written warranty spells out exactly what is covered and for how long - no vague promises.
We hold a current California state contractor license, which you can verify yourself through the Contractors State License Board. Licensing confirms we have met the state requirements for training, insurance, and financial responsibility before setting foot on your property.
Every one of these points matters more in Windsor than in most places - the clay soils, the seasonal wet-dry cycles, and the seismic activity in the North Bay mean that slab-lifting done without local knowledge often needs to be redone. We bring the experience and the guarantees to make the repair last.
For more information on concrete best practices, see the American Society of Concrete Contractors.
When a slab is too damaged to lift, we cut out the problem section cleanly before re-pouring.
Learn MoreFull foundation builds for new structures, additions, and major renovations in Windsor and Sonoma County.
Learn MoreWindsor's clay soils keep moving - act now before a small void becomes an expensive replacement. Call for your free assessment today.