Paving
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The subgrade. By a significant margin. Asphalt and concrete are both capable of lasting 20–30 years when placed over a properly prepared, well-drained base. Either will fail in 3–5 years if placed over poorly compacted subgrade, inadequate base depth, or a surface that doesn't drain correctly.

This is why we evaluate the subgrade condition and drainage before any material goes down. The visible surface gets all the attention, but the performance is determined entirely by what's underneath it.

For most residential driveways on the California Central Coast, asphalt is the better choice. It's less expensive upfront, handles our temperature range well, and is easier to repair if sections fail. It also performs better over slightly flexible subgrades — like the clay soils common in parts of Sonoma and Monterey Counties — because it can flex slightly rather than crack.

Concrete makes sense when you need maximum load capacity (heavy equipment, RVs, or commercial traffic), want a longer service life with minimal maintenance, or prefer the aesthetic. It costs more upfront and is harder to repair, but a well-built concrete surface can outlast multiple asphalt lifecycles. We'll give you a straight recommendation based on your specific situation.

Premature paving failure almost always traces back to one of three causes: the subgrade wasn't adequately compacted, the base layer was too thin or the wrong material, or drainage wasn't established correctly and water is undermining the surface from below.

Clay soils on the California Central Coast are a common factor. Clay absorbs moisture and expands, then dries and contracts. Without sufficient base depth to isolate the pavement from that movement, the surface cracks and heaves. Inadequate drainage is the other major culprit — water that can't exit the subgrade freezes, moves, or weakens the base, causing the surface above it to fail.

For a standard residential driveway, 2–3 inches of compacted asphalt over a properly prepared aggregate base is typical. The base layer itself — usually compacted crushed rock — is typically 4–6 inches deep, though this varies based on soil conditions and the anticipated load.

For driveways that will carry heavier vehicles — RVs, delivery trucks, or heavy farm equipment — both the asphalt thickness and the base depth need to be increased. Using residential-spec paving for a commercial or agricultural application is one of the most common reasons driveways fail prematurely. We spec the thickness based on actual use, not a generic standard.

Water needs to move off the surface quickly and away from structures. A properly graded paved surface should have a cross-slope or crown of approximately 2% — enough to move water to the edges without being noticeably steep. At the edges, water needs somewhere to go: a swale, catch basin, or drainage outlet that directs it away from the property.

On hillside driveways, drainage is more complex. Water running down the slope needs to be intercepted and redirected before it reaches the paved surface or undercuts the road. We design drainage into every paving project from the start — not as an afterthought.

Permit requirements vary by county, municipality, and project scope. In most cases, paving a residential driveway doesn't require a separate paving permit, but it may trigger requirements under stormwater management regulations — particularly if the impervious surface area increases significantly. Sonoma County and Monterey County both have stormwater control requirements that can apply to larger paving projects.

Commercial parking lots and larger paved areas are more likely to require permits and drainage plans. We'll let you know what's needed for your specific project and can help coordinate the permitting process if required.

The dry season — roughly May through October — is the ideal window for most paving projects. Asphalt needs to be placed and compacted at temperature, which is much easier to achieve on a dry, warm day than on a cold or wet one. Subgrade preparation also goes better in dry conditions when soil is at optimal compaction moisture content.

That said, paving can be done year-round in most of our service area when conditions allow. We schedule around the forecast and plan projects to take advantage of suitable windows. For larger projects with extended timelines, fall scheduling sometimes makes sense to get prep work done before winter.

A properly installed asphalt driveway over a well-prepared subgrade typically lasts 20–30 years with basic maintenance — crack sealing and sealcoating at appropriate intervals. The actual lifespan depends heavily on subgrade quality, drainage, traffic loads, and maintenance history.

Driveways that were paved over inadequate base or poor drainage may start showing significant deterioration in 5–10 years. When we do a replacement, we always address the underlying cause of the previous surface's failure — otherwise we're just replacing the same problem on the same schedule.

Paving cost depends on the square footage, the thickness and type of material specified, how much subgrade preparation is needed, site accessibility, and whether existing pavement needs to be removed first. There's a wide range between a straightforward flat driveway replacement and a hillside road paving project with drainage infrastructure.

Published price ranges for paving are rarely useful because they don't account for site-specific conditions. The most accurate way to get a number is to have us look at the site. Call 707-601-9091 and we'll schedule a visit.

Yes. DW Excavation holds California Contractor License #1060838 and carries liability insurance and workers' compensation coverage. We've been operating on the California Central Coast since 2013 and are familiar with the permit requirements and code standards that apply to paving projects in both Sonoma and Monterey Counties.

Hiring a licensed contractor matters because it means you have recourse through the California Contractors State License Board if issues arise, and because licensed contractors are required to carry insurance that protects you as the property owner.