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Serving Mill Valley, CA and surrounding areas. (628) 257-3020
Custom Mill Valley Concrete & Masonry is a masonry contractor serving San Rafael, CA, handling foundation repair, retaining wall construction, and chimney repair across the city's diverse neighborhoods - from the hillside streets above downtown to the ranch homes of Terra Linda. We have served San Rafael and Marin County since 2021, and we understand the specific demands that clay-heavy soils, wet Bay Area winters, and housing built before 1980 place on masonry throughout the city.
A large share of San Rafael's homes were built in the 1940s through the 1960s, when foundation standards were different from what California building code requires today. Clay soils throughout the city swell each winter and shrink each dry summer, putting annual stress on foundations that were not designed for that cycle. The hillside neighborhoods above downtown - near Dominican University and off Mission Avenue - face additional drainage challenges that direct water toward foundation walls. Learn about foundation repair.
San Rafael's hillside neighborhoods above downtown have some of the steepest residential lots in Marin County. Retaining walls on those slopes take on significant hydrostatic pressure every wet season, and walls without proper drainage behind them are the ones we see failing. We build with gravel backfill and drain pipes as standard - not as an add-on - so the wall has a path for water rather than a fight against it all winter.
San Rafael has a significant number of mid-century homes with original masonry chimneys - structures that have been through decades of rainy winters and Bay Area seismic activity without a thorough inspection. Failed chimney flashing is one of the most common causes of water intrusion in older homes throughout the city, often showing up as a ceiling stain near the fireplace rather than an obvious exterior leak.
The hillside neighborhoods above downtown San Rafael have older Craftsman bungalows and Spanish-style stucco homes with original brick and stone details that need matched mortar repairs - not standard cement patches that stand out against decades-old material. Restoration work on these homes calls for mortar composition matched to what was originally used, so repairs age consistently with the surrounding structure.
Ranch homes in Terra Linda and Sun Valley typically have concrete driveways that were poured when the neighborhood was built in the 1950s and 1960s. At that age, most of them have cracked along clay soil movement lines or heaved at expansion joints. Paver installations on these lots let us replace the worn surface with something that accommodates future soil movement rather than cracking under it the way a solid slab tends to.
Brick and block walls throughout San Rafael show accelerated mortar wear from the city's 37 inches of annual rainfall and the chronic dampness that lingers in shaded areas during the long wet season. We remove failed mortar joints and pack in fresh material matched to the original profile - so the repair doesn't stand out against work that has been in place since the Eisenhower administration.
San Rafael is Marin County's oldest and largest city, incorporated in 1874, and a substantial portion of its housing stock was built before 1980. That means many homes in the city are carrying 45 to 80 years of wear on foundations, chimneys, and exterior masonry without a full structural review in that time. The city's neighborhoods are strikingly diverse in terrain - the Terra Linda and Sun Valley areas are relatively flat with postwar ranch-style homes on modest lots, while the hillside streets above downtown, near Dominican University and off Mission Avenue, have steeper lots with older Craftsman bungalows and Spanish-style stucco homes. Each setting presents different masonry challenges - flat areas deal with clay soil movement and drainage near the Canal, while hillside properties contend with slope-driven drainage, foundation settling on grades, and the wear that comes with dense tree cover and limited sun on north-facing walls.
The Bay Area climate compounds the challenge. San Rafael averages around 37 inches of rain per year, concentrated in a five-month wet season that soaks the region's clay soils and drives moisture into any gap in aging masonry. In summer, those same soils dry out and pull away from foundations, completing the seasonal cycle that works on older structures year after year. The hillside neighborhoods in the city's eastern and northern portions also fall within elevated fire hazard severity zones designated by CAL FIRE, which affects spark arrestor requirements for chimneys and makes non-combustible masonry materials a practical choice for property walls and retaining structures near open space.
Our crew works throughout San Rafael regularly, and we understand the local conditions that affect masonry work across the city's different neighborhoods. We pull permits from the City of San Rafael Community Development Department on structural projects and know what to expect from the review timeline. The city's permit process is generally consistent, but hillside properties and projects near sensitive drainage areas can require additional review steps that we account for in our scheduling.
San Rafael is a city where the right neighborhood makes a real difference in how a job is approached. The ranch homes of Terra Linda and Sun Valley are largely accessible flat-lot work - good staging, straightforward equipment access. The hillside streets near Dominican University and the older blocks off Mission Avenue are narrower, with steeper grades, tighter access, and homes that often require hand-carrying materials past established gardens and mature trees. We work comfortably in both settings. Downtown San Rafael along Fourth Street and the surrounding blocks also see mixed-use and older commercial masonry that we handle alongside residential projects.
We also serve the towns directly surrounding San Rafael. Our team works regularly in Fairfax to the west and in Novato to the north, so if you have a project that spans the area or you want a contractor with broad Marin County experience, we are the right call.
Reach us by phone or through the contact form. We respond within 1 business day to schedule a visit - no waiting weeks for a callback.
We visit your San Rafael property, evaluate the scope, and note any slope, access, or drainage factors that affect the job. You receive a written estimate with clear pricing before any work begins - no surprises once we are on site.
We handle permit applications with the City of San Rafael for any project that requires one. Once approved, our crew arrives on the agreed date - you do not need to be home for most exterior masonry work.
When the work is done, we clean the site and walk through the finished project with you. If a city inspection is required, we schedule and attend it so you are not coordinating with the building department on your own.
We serve San Rafael homeowners in Terra Linda, the hillside neighborhoods above downtown, and throughout the city. Call us or fill out the form and we will get back to you within 1 business day.
(628) 257-3020San Rafael is Marin County's county seat and its largest city, with about 61,000 residents. It sits at the geographic center of the county and has a range of neighborhoods that differ significantly in character and terrain. The historic downtown along Fourth Street is the city's commercial core, lined with local restaurants and shops that most residents pass through regularly. The Terra Linda neighborhood, developed heavily in the 1950s and 1960s, is dominated by single-story ranch homes on relatively flat lots - a postwar suburban landscape that still defines a large portion of the city's residential fabric. Closer to downtown, the hillside streets above Mission Avenue and near the campus of Dominican University of California have older, more varied housing - Craftsman bungalows, Spanish stucco homes, and custom builds from the early to mid-1900s on narrow, wooded lots with significant grade changes.
The city is also home to the Marin County Civic Center, the Frank Lloyd Wright-designed landmark completed in 1962 that serves as one of the most recognizable buildings in the Bay Area. The Canal neighborhood in the southeastern part of the city is the most densely populated area, with older multi-family housing concentrated near the bay. San Rafael borders Fairfax and Novato to the north, and sits adjacent to San Anselmo and Larkspur, making it the hub from which most of Marin County's communities radiate.
Install block foundation walls built to code and last decades.
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Learn MoreCall us or request a free estimate online - we respond within 1 business day and serve all of San Rafael and the surrounding Marin County communities.