Serving San Mateo, CA and surrounding areas. (650) 753-8786
A sunken foundation does not have to mean a full replacement. We lift settled slabs back to level - with permits handled and the root cause addressed.
Foundation raising in San Mateo is the process of lifting a sunken concrete slab back to its original level position by pumping material beneath it through small drilled holes - most residential jobs take one to two days of active work, and foam injection jobs are often walkable the same day.
If your floors feel uneven, doors have started sticking, or you can see gaps opening up between the wall trim and the floor, a dropped foundation is likely the cause. In San Mateo, the wet-dry seasonal cycle works on bay mud and clay soils every year - and that constant movement is what drives most of the foundation settlement we see. Foundation raising is the right solution when the concrete itself is still structurally sound. When the slab needs more than lifting, slab foundation building is the next step.
We assess the slab condition before quoting anything. If raising makes sense, we handle the permit process with the City of San Mateo Building Division, evaluate the drainage situation around the foundation, and give you a fix that is built to hold through the weather cycles San Mateo delivers every year.
If interior doors or windows that used to work smoothly now jam, drag on the floor, or leave a visible gap at the top or bottom of the frame, that is often one of the first signs your foundation has shifted. The frame is moving because the ground beneath it is no longer level. In San Mateo's older homes - many built in the 1950s and 1960s - this is a common early warning sign.
If a marble consistently rolls in one direction across your floor, or certain rooms feel noticeably lower than others, the foundation beneath that section may have dropped. This kind of gradual settling is common in homes built on bay mud or expansive clay soil, and it tends to get worse each year it goes unaddressed. A simple level from a hardware store can confirm what you are feeling.
Diagonal cracks running from the corners of door or window frames, or cracks appearing along the ceiling line, often point to foundation movement rather than just normal settling. A single hairline crack is usually minor, but multiple cracks appearing at the same time - or cracks that are growing - deserve a professional look. This is especially worth watching after San Mateo's wet winter season.
If water collects against your exterior walls or in low spots near your home's perimeter after a rainstorm, that water is likely finding its way beneath the slab and eroding the soil underneath. Left unaddressed, poor drainage is one of the most reliable paths to a sinking foundation - and it is something you can spot yourself after any significant winter rainfall.
We lift sunken residential foundations using two methods - mudjacking, which pumps a cement-and-soil slurry beneath the slab, and polyurethane foam injection, which uses a lightweight expanding foam that cures within minutes. Every job begins with an honest on-site assessment of the slab's condition. If the slab is structurally sound and the soil situation supports a lasting lift, we give you a written quote for the work. If the damage has progressed beyond what raising can fix, we tell you that upfront and explain your options, including slab foundation building for situations where a full replacement is the right call.
After the lift, we patch the drill holes with a concrete mix that blends with the existing surface and do a final level check before leaving. When a job also involves removing a damaged section cleanly, concrete cutting can be coordinated as part of the same scope. We handle permits with the City of San Mateo Building Division and assess the drainage situation around every foundation we work on, because a lift that does not address water management tends to need repeating.
The established, cost-effective method - suited for larger slabs where the additional material weight is not a concern and a slightly longer cure time is acceptable.
A faster, lighter alternative that cures in minutes - often the better choice for homes in San Mateo's lower-elevation neighborhoods where softer soils are present beneath the slab.
Included on every foundation raising job - because a lift without addressing water management is a temporary fix in San Mateo's wet-dry climate.
For homeowners who want the work documented and inspected - required for most structural foundation work in San Mateo and handled on your behalf.
A large share of San Mateo sits on bay mud or expansive clay soil - particularly in the lower-elevation neighborhoods closer to the bay. These soil types shrink during dry summers and swell when the rains return, which puts constant stress on foundations year after year. Homes built between the 1940s and 1970s - a large part of San Mateo's housing stock - were often built before rigorous soil compaction standards existed, which means the soil beneath them has had decades to move. The result is that foundation settlement here is not unusual, and the question is usually not whether a home will experience some movement but how much and how soon. Homeowners in Foster City, CA face similar conditions given the area's low-lying terrain near the bay, and we work there regularly.
San Mateo also sits in one of the most seismically active regions in the country, and the city's building department takes structural foundation work seriously as a result. Any foundation raising project that qualifies as structural will require a permit and a city inspection - which is actually a meaningful protection for you as a homeowner. Permitted work is documented, inspected, and easier to account for when you sell. We work with the City of San Mateo Building Division on every applicable job and factor that timeline into the schedule from the start. Homeowners in Belmont, CA deal with similar soil and permitting considerations, and we handle those jobs the same way.
The first conversation is short - describe what you are noticing and where. We will reply within one business day to schedule an on-site visit. A precise scope and quote cannot come from a phone call alone, so we do not try.
We walk the affected area, check the slab's condition, and measure how much it has dropped and where. This visit takes 30 to 60 minutes. We explain what we find as we go and tell you honestly whether raising makes sense.
If a permit is required, we handle the application with the City of San Mateo Building Division. Permit processing can add one to two weeks, but it means the work is inspected and documented - which protects you at resale. Once permits are in hand, we set the work date.
The crew drills small holes, pumps the lifting material, monitors the rise carefully for an even lift, then patches the holes. Foam jobs are walkable within an hour or two. Cement-slurry jobs are driveable within 24 hours. We do a final level check before we leave.
We visit your San Mateo property, assess the foundation, and give you a written quote with no pressure and no obligation.
(650) 753-8786We do not give prices over the phone or recommend a method before seeing the slab in person. Every quote follows a site visit where we check the concrete's condition, measure how much it has dropped, and evaluate the drainage situation. That is how you avoid surprises on the final bill.
Foundation work in San Mateo requires permits for most structural jobs - and those permits need to be applied for correctly, with the right documentation, before a crew arrives. We manage that process from application to inspection so you have a complete paper trail the day the work is done.
A foundation that sinks once in San Mateo's clay-heavy soils will sink again if the water situation is not fixed. We evaluate drainage on every job and tell you honestly what, if anything, should be done alongside the lift. The goal is a fix that holds through the next rainy season and the ones after that.
Any contractor doing structural foundation work in California must hold a valid state license. You can confirm ours in seconds on the California Contractors State License Board website at{' '}cslb.ca.gov - it shows whether the license is active, bonded, and whether any complaints have been filed. We encourage every homeowner to check before hiring anyone.
Foundation work carries more weight than most home repairs - a poor job can create problems that are expensive to undo. We built this business on straight answers, proper documentation, and work that holds. For permit and inspection requirements from the City of San Mateo Building Division, and for independent verification of contractor licensing through the California Contractors State License Board, those resources are available directly.
Precision cutting to remove damaged slab sections cleanly before or after a foundation raise, or to create drainage channels that prevent future sinking.
Learn MoreWhen raising is not the right answer and a full new slab is needed, slab foundation building starts fresh with properly compacted soil and reinforced concrete.
Learn MoreSan Mateo's wet winters move fast - call now to lock in your assessment date and protect your home before the soil shifts again.
