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Serving San Rafael, CA and surrounding areas. (628) 277-0007
A driveway is only as good as what sits beneath it - proper grading and excavation on Marin's clay soils is what separates a surface that lasts from one you repair every few years.
A driveway is only as good as what sits beneath it - proper grading and excavation on Marin's clay soils is what separates a surface that lasts from one you repair every few years.
Grading and excavation in San Rafael involves reshaping the ground to the correct slope and elevation, removing unstable soil or old material, and compacting a fresh base layer - the foundation work that makes every paved surface on top last for years instead of failing early, with most residential driveway projects completed in one to two days.
Homeowners often focus on the asphalt layer they can see, but the ground beneath is what actually determines how long a driveway holds up. In San Rafael, Marin County's clay-heavy soils expand and contract with the wet-dry cycle every year - if that movement is not accounted for during excavation and base preparation, the pavement above cracks and sinks regardless of how good the asphalt is. Many homeowners contact us after spending money on drainage solutions that did not solve the problem, only to find out the grade itself was sending water the wrong direction from the start.
Getting the base right before paving is also the most important factor in cost control. A properly graded site means the paving phase goes smoothly, stays on schedule, and does not require expensive corrections later. It also protects your home's foundation - a correctly graded driveway sends water toward the street, not toward your garage or the side of your house.
After a winter storm, puddles sitting on your driveway for hours or days signal the ground beneath has settled or was never graded correctly. In San Rafael's wet season, that standing water keeps working into the base and makes the problem progressively worse.
Rainwater running toward your garage door or foundation is a grading problem, and one of the most urgent ones to fix. Water pooling against a foundation causes damage that costs far more to repair than the grading work that would have prevented it.
Ruts, washouts, and areas where soil has visibly shifted on a sloped lot are signs the site needs professional regrading. Left alone, erosion destabilizes any paved surface built on top and accelerates deterioration after each wet season.
If you are replacing a cracked driveway, adding a parking area, or building an ADU, grading and excavation is the required first step. Skipping it or doing it poorly is the most common reason new driveways fail within a few years.
Most grading and excavation projects in San Rafael fall into one of two categories: new driveway or parking area preparation, where we start from scratch on an unimproved or demolished surface, and base correction for an existing driveway where the grade has shifted or the subbase has softened over time. For new projects, we excavate to the planned depth, remove all unstable material, and compact a crushed aggregate base to the correct slope and elevation before paving begins. For existing driveways that keep cracking or sinking, we assess whether targeted base repair and recompaction is enough or whether full excavation is needed. When the drainage plan calls for more than just a corrected slope, drainage solutions - channel drains, inlets, and proper outfall routing - are often added as a complement to grading work.
Hillside lot regrading is a specialized service we offer for San Rafael homes where terrain, soil movement, or decades of erosion have left the ground poorly pitched. Steep driveways need both the correct slope for drainage and careful compaction technique so the base holds under vehicle weight. We also handle site preparation for larger projects - additional parking areas, ADUs, and expanded garages - where proper grading is the first phase before any concrete curbing and sidewalks or paving work begins.
Suits homeowners replacing an old driveway or installing a new one - full excavation, base rebuild, and correct slope before paving.
For sloped San Rafael lots where water is draining toward the home or where the existing grade has shifted and eroded over time.
Commercial or residential parking areas need a level, compacted, well-drained base - we handle excavation and grading as the first phase.
When the existing subbase under a driveway or lot has softened or shifted, targeted excavation and recompaction address the root cause.
San Rafael's clay-heavy Marin County soils are the defining challenge for any grading project here. Unlike sandy or loam soils that drain quickly and stay relatively stable, clay swells significantly when it absorbs winter rain and then shrinks back in the long dry summer. That seasonal movement is the dominant reason driveways crack and sink in this area - not freeze-thaw cycles, which are essentially absent in this climate. A grading contractor who knows this will excavate deeper, remove problem material rather than compact over it, and specify a more robust base. One who does not will produce a result that looks good until the first wet season. We serve clients throughout Tiburon and across Marin, where these same soil and drainage conditions apply.
The permitting side of grading work in San Rafael also requires local familiarity. Grading permits are handled by the city's building department, while any work touching the public right-of-way - the driveway apron connecting to a city street - requires a separate encroachment permit from the public works department. Contractors unfamiliar with this two-track process can delay projects by weeks. San Rafael also has portions of the city in designated fire hazard zones, which can affect how grading near structures is handled for hillside lots. We work in Sausalito and across the Marin hillside communities, and we handle the full permit process so the project stays on schedule. The U.S. Geological Survey documents Marin County's expansive clay soil conditions that drive so much of the subsurface movement we account for in our base preparation work.
We visit your property to assess the existing grade, soil conditions, drainage patterns, and equipment access. We measure the area, note obstacles, and discuss what you want the finished surface to accomplish. This visit is the basis for an accurate written estimate, and we follow up within 1 business day.
We determine which permits are required - grading permits and right-of-way encroachment permits for work near a city street are handled by separate San Rafael departments. We manage the applications and keep you updated. Budget a week or more for permit processing before work begins.
The crew excavates to the planned depth, removes unstable soil, old pavement, and debris, then shapes the ground to the correct slope and elevation. On San Rafael's clay-heavy lots, this step typically includes replacing soft material with compacted crushed aggregate for a stable, well-draining base.
The new base is compacted in layers and the slope is verified to confirm water drains away from your home. Once the graded base passes inspection, the site is ready for asphalt paving. We walk you through the finished grade and drainage direction before closing out.
We assess your lot in person, explain exactly what the work involves, and give you a written quote. No pressure, no obligation. We reply within 1 business day.
(628) 277-0007San Rafael's clay-heavy Marin soils require deeper excavation and more robust base replacement than stable sandy ground. We remove the problem material rather than grading over it, so the paved surface built on top does not crack and sink after the first wet winter.
Steep, narrow driveways in San Rafael's hillside neighborhoods require the right equipment and a drainage plan designed for the specific slope. We have worked on sloped Marin lots and account for access and water management before we show up, not after.
San Rafael grading permits and right-of-way encroachment permits involve separate city departments. We handle the applications, coordinate with the city, and keep the project moving - you stay informed without navigating the process yourself.
California requires contractors doing grading and paving work to hold a valid state license. You can verify any contractor's license status through the California Contractors State License Board at cslb.ca.gov before signing anything. We are licensed, insured, and transparent about our credentials.
Getting the ground preparation right is the single most important factor in how long any paved surface lasts in San Rafael. Every project we take on starts with an honest site assessment and ends with a base that is built to handle Marin's soil conditions - not just one that looks good on the day we leave.
After grading establishes the right elevation, concrete curbing defines edges and retains the base for long-term stability.
Learn MoreGrading sets the slope - drainage solutions add the channels and inlets that direct water safely off your property.
Learn MoreThe ideal work window in San Rafael runs May through October - reach out now to secure your spot and get the base work done before fall paving season peaks.