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Serving Redwood City, CA and surrounding areas. (650) 587-4680
Hillside soil shifts every wet season. We build concrete retaining walls that hold your slope, protect your yard, and are engineered for Bay Area clay soils and seismic loads.
Concrete retaining walls in Redwood City hold back soil on sloped or uneven lots, prevent hillside erosion, and create usable flat space from yards that would otherwise be unusable slopes. Most residential wall projects take two to five days of active work on-site, with permit processing adding a few weeks before the crew arrives.
If your property is on a hillside, you already know the wet season puts real pressure on the landscape. Redwood City sits at the edge of the Santa Cruz Mountains foothills, and the clay-heavy soil in many neighborhoods swells when it rains and shrinks when it dries - putting ongoing stress on anything trying to hold it back. A well-built concrete retaining wall is designed for exactly that condition.
Many homeowners also ask us about concrete floor installation when they are leveling out a slope to add a new outdoor living area or garage pad. The two projects often go hand in hand.
If you can see soil creeping downhill after a wet winter, the slope is not stable. Redwood City's clay soil expands when it absorbs rain and can move significantly over a single wet season. A retaining wall stops that movement before it reaches your foundation, driveway, or a neighbor's property.
A retaining wall that is no longer perfectly vertical is under stress it was not built to handle. This is especially common with older walls in Redwood City neighborhoods built in the 1950s and 1960s, which often lack the drainage and reinforcement that current standards require. A leaning wall does not fix itself - it will continue to move until it fails.
Standing water collecting at the bottom of a hillside after rain means the soil above is not draining properly. Over time, that saturated soil becomes much heavier and puts pressure on anything in its path. A retaining wall with drainage built in can redirect that water safely away from your home.
Hairline cracks in concrete are normal, but cracks that are widening, horizontal, or running along the base of the wall are warning signs. White chalky staining on the face of the wall means moisture is getting in and will eventually weaken the structure. Both are worth having a contractor assess before the problem gets worse.
We build new concrete retaining walls from the footing up - including excavation, steel reinforcement, forming, the pour, gravel drainage backfill, and weep holes. Every wall we build in the Bay Area is designed with seismic loads in mind, because walls here face ground movement that flat-state projects do not. We also handle the permit application with the City of Redwood City, which is required for most walls over four feet tall.
If you need a finished surface on the leveled area behind the wall, we can pair the retaining wall project with concrete floor installation for a patio, parking pad, or storage area. For properties where the footings need to tie into the larger structure, we also offer concrete footings work as a standalone service.
Suits homeowners with sloped lots who need to hold back soil, create flat outdoor space, or protect a structure from ground movement.
Suits homeowners who want to build raised planting beds, define a yard boundary, or add low decorative walls to a flat or gently sloped yard.
Suits properties with older walls showing signs of leaning, cracking, or drainage failure that cannot be safely repaired.
Suits projects over four feet tall where the city requires an engineered plan and inspection sign-off before final approval.
Redwood City sits at the edge of the San Francisco Bay and rises into the Santa Cruz Mountains foothills. Hillside neighborhoods like Farm Hill and Emerald Hills have lots with significant slopes and expansive clay soil that swells in the wet season and shrinks in the dry summer heat. That soil movement is one of the main reasons older walls in those areas start to lean or crack - they were not designed for the soil behavior or the drainage demands that a wet Bay Area winter brings. Homeowners in hillside areas of San Carlos and Belmont face the same conditions.
San Mateo County also sits within a high seismic hazard zone due to proximity to the San Andreas and Hayward faults. Retaining walls built here must be designed with California's seismic requirements in mind - thicker footings and more steel reinforcement than you would see in most other parts of the country. That engineering adds cost, but it is also why a properly built wall here is genuinely designed to stay put during an earthquake. The City of Redwood City Building Division requires permits for walls over four feet tall, which adds a few weeks of lead time to most projects but ensures the design has been reviewed before the crew arrives.
We walk your property in person before quoting anything. We look at the slope, the soil, how close the wall will be to your home or property line, and whether any utilities need to be located before digging. You will have a written estimate that includes drainage work - not just the wall.
If your wall requires a permit - which most walls over four feet do - we submit the application to the City of Redwood City on your behalf. Permit review typically takes a few weeks. We will give you a realistic timeline so you can plan accordingly. There is no extra charge for permit coordination.
Once permits are in hand, the crew digs the footing, sets the steel reinforcement, builds the forms, and pours the concrete. Most residential walls take two to five days of active on-site work. You will need to keep the area clear during construction.
After the concrete firms up, we install the gravel drainage layer and backfill with soil. We then walk you through the finished wall, show you the drainage outlets, and explain what normal settling looks like versus something worth calling about.
Free on-site estimate. We walk your property, explain what we see, and give you a written quote that includes drainage - not just the wall. No obligation.
(650) 587-4680Every estimate we write for a retaining wall includes the gravel backfill and drainage outlets. Some contractors quote wall-only and add drainage as a change order mid-project. We put it in writing before you sign anything, so the number you see is the number you pay.
We have submitted permit applications for retaining walls through the City of Redwood City and know the process. We handle the application, coordinate the engineering documentation when required, and manage the city review so you never have to figure out what the building department needs.
Every retaining wall we build in San Mateo County is reinforced and footed to meet California's seismic design requirements. That means more steel inside the concrete and a deeper footing than national average projects. Learn more from the California Geological Survey.
Hillside work is different from flat-lot concrete. The soil conditions, drainage requirements, and permit review for a sloped lot in Emerald Hills or Farm Hill are not the same as a standard backyard wall. We have worked on hillside properties throughout the Peninsula and know what those projects require before the first shovel goes in.
These are not just talking points - they reflect the way we price, plan, and execute every retaining wall project. When you call us, you get a contractor who has done this work on hillside lots in this county and knows how to avoid the problems that make these projects go wrong.
Pour a new concrete floor on the level surface created behind a retaining wall - patios, parking pads, and utility slabs.
Learn MoreDeep concrete footings that anchor structures to stable soil, often needed when retaining walls tie into a building or fence system.
Learn MoreSpring and summer slots fill fast in Redwood City. Call today or submit your project details and we will be back to you within one business day.