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Serving Mill Valley, CA and surrounding areas. (628) 257-3020
Custom Mill Valley Concrete & Masonry is a masonry contractor serving Novato, CA, handling concrete block walls, foundation repair, and retaining wall construction across Novato's neighborhoods - from the ranch homes near downtown to the waterfront streets of Bel Marin Keys. We have served Novato and Marin County since 2021 and understand the clay soils, wet winters, and older housing stock that shape every masonry project in the city.
Novato homeowners use concrete block walls for boundary walls, garden enclosures, and retaining structures on sloped lots. The clay soil common throughout the city creates real lateral pressure behind any retaining wall, which makes the footing depth and drainage design more important here than in drier parts of California. We build with gravel backfill and drain pipes as standard - not as an add-on - because a wall without drainage in Novato will fail faster than one with it. Learn about concrete block walls.
A large share of Novato homes were built between the 1950s and 1970s, when foundation standards were less demanding than what California building code requires today. The city's clay-heavy soil swells each winter and pulls away each dry summer - putting annual stress on foundations that were never designed for that cycle. Homes on sloped lots near the hills face extra drainage challenges that can push water toward foundation walls rather than away from them.
Sloped lots throughout Novato - particularly in neighborhoods near the western hills - need retaining walls to keep soil from creeping into driveways, yards, and foundations after wet winters. We work with natural stone, concrete block, and poured concrete depending on what the site and the homeowner call for. Every wall we build includes proper drainage behind it, which is the single biggest factor separating a wall that lasts from one that shifts within a few seasons.
Novato has a significant number of mid-century ranch homes with original masonry chimneys that have never been thoroughly inspected. Failed chimney flashing is one of the most common causes of water intrusion in these homes, often showing up as a ceiling stain near the fireplace before the exterior damage becomes obvious. Homes near Novato's hillside open spaces also require code-compliant spark arrestors on all chimney flues.
Brick and block walls in Novato show accelerated mortar deterioration because the city's wet winters keep joints damp for months at a time. Marine fog from San Pablo Bay adds moisture exposure even outside the rainy season, which keeps the exterior of waterfront properties in Bel Marin Keys chronically damp. We remove failed mortar joints and pack in fresh material matched to the original profile before water works deeper into the wall assembly.
Ranch homes throughout Novato typically have concrete driveways that were poured when the neighborhood was built in the 1950s and 1960s. At that age, most have cracked or heaved along clay soil movement lines that open and close with the seasons. Paver installations accommodate that movement better than a solid slab - individual units can be lifted, re-leveled, and reset when the ground shifts, rather than left to crack and grow wider each year.
Novato is the largest city in Marin County, and a large share of its housing was built between the 1950s and 1970s during the postwar suburban boom. Many of these ranch-style homes still have their original foundations, chimneys, and concrete flatwork - structures that are now 50 to 70 years old and have never had a thorough masonry inspection. The city's soil is clay-heavy throughout most neighborhoods, and that clay swells when Novato's wet season arrives in November and shrinks when the dry summer months pull moisture out of the ground. That annual cycle cracks driveways, shifts walkways, and puts steady pressure on foundation walls - not as a one-time event, but as a pattern that repeats every year until someone addresses the underlying drainage problem.
Novato's geography adds to the challenge. Neighborhoods near the western hills, including areas adjacent to Indian Tree Open Space Preserve, sit in elevated fire hazard severity zones designated by CAL FIRE, which imposes specific requirements on chimney flues and non-combustible materials near wooded areas. Waterfront neighborhoods like Bel Marin Keys face chronic marine moisture from San Pablo Bay that accelerates mortar deterioration and paint failure even between rainy seasons. And the Hamilton neighborhood, built on the former Air Force base, has homes that are now 25 to 30 years old and are entering their first major maintenance cycle for exterior masonry and concrete work.
Our crew works throughout Novato regularly, and we understand the local conditions that affect masonry work here. Permit applications for structural work go through the City of Novato Community Development Department, and we handle that process for every job that requires it - so you are not left to figure out inspections and approvals on your own. We have worked on homes across Novato's range of neighborhoods, from the older ranch houses near downtown Grant Avenue to the waterfront properties in Bel Marin Keys and the newer two-story homes in Hamilton.
Novato sits at the northern end of Marin County, which means it gets a bit more warmth and a bit less coastal fog than cities closer to the bay - but the clay soils and wet winters are consistent throughout the county. Highway 101 runs through the center of the city, and most of Novato's residential neighborhoods spread east and west from it. We serve all of them, from the older in-town streets near downtown to the quieter roads out toward Black Point and Ignacio.
We also serve the communities just south of Novato. If you need to reach us for work in San Rafael or neighboring Richmond, those pages have area-specific information for each city.
Reach us by phone or through the contact form. We respond within 1 business day. You do not need photos or measurements ready - a brief description of the problem is enough to schedule a site visit.
We visit the property, look at what needs to be done, and give you a written estimate before any work begins. We will let you know whether a permit is required and what that adds to the timeline. There is no charge for the estimate, and no pressure to decide on the spot.
Once we have a confirmed start date, we arrive on time with the crew and materials needed for your job. Most homeowners do not need to be present during the work itself - just accessible by phone if a question comes up during the day.
When the job is done, we walk through the finished work with you and answer any questions. If permits were pulled, we handle the final inspection coordination. We clean up the work area before we leave.
We work throughout Novato and respond to all inquiries within 1 business day. No obligation, no pressure.
(628) 257-3020Novato is the northernmost city in Marin County, with roughly 55,000 residents and the county's largest land area. Its neighborhoods range considerably in character. Downtown Novato along Grant Avenue has the historic in-town feel of a small California city, with older buildings and a mix of housing from the early 1900s through the mid-century. East of downtown, the Ignacio area and Bel Marin Keys offer a more suburban and waterfront character - Bel Marin Keys in particular is a planned canal community built in the 1960s and 1970s with homes on direct water access. To the north, the Hamilton neighborhood occupies the site of the former Hamilton Air Force Base, which was redeveloped starting in the 1990s into a mix of newer single-family homes and townhomes. You can read more about Novato's history and neighborhoods on Wikipedia.
The western side of the city borders open space and rolling hills, including Indian Tree Open Space Preserve - a popular hiking destination for residents and a reminder that Novato sits at the edge of both suburban Marin and the more rural Sonoma County landscape to the north. This hillside exposure means some Novato neighborhoods face genuine wildfire risk in summer, a factor that shapes both local building codes and what masonry materials make sense near wooded lots. The city is also served by the City of Novato Community Development Department for building permits, which handles all permit applications for structural masonry work within city limits. Nearby, Fairfax is another Marin community we serve regularly with similar older housing stock and hillside conditions.
Install block foundation walls built to code and last decades.
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Learn MoreCall us or send a message and we will get back to you within 1 business day with a free, no-obligation estimate for your Novato home.