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Serving South San Francisco, CA and surrounding areas. (650) 822-6266
Keystone South SF Asphalt Paving handles asphalt paving, sealcoating, and repairs across South San Francisco and the surrounding Peninsula. Get a free on-site estimate with no pressure and no surprises.
Keystone South SF Asphalt Paving is a licensed asphalt paving contractor serving South San Francisco, CA and the surrounding Bay Area. We offer 16 services - from new driveway installation and parking lot paving to sealcoating, crack repair, and drainage work - across 12 cities on the Peninsula. Whether your surface needs a fresh seal or a full replacement, we assess the condition honestly and recommend only what it actually needs.
Driveway fading and cracking? Sealcoating protects the surface and extends its life by years.
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Faded lines causing confusion in your lot? Fresh striping restores order and keeps you compliant.
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Ready for a new driveway or lot? We lay a solid base and smooth surface built for the Bay Area.
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Old, crumbling lot driving customers away? A new asphalt surface makes the right first impression.
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Cracked or uneven driveway? A new installation adds curb appeal and handles daily traffic for decades.
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Patches failing again and again? We fix the problem at the source, not just the surface.
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Small cracks now mean big repairs later. Sealing them early keeps water out and costs down.
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Need a lot your tenants and customers can count on? We handle commercial projects of any size.
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Catching problems early saves money. Regular maintenance keeps your lot safe and looking sharp.
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Good base, rough surface? Resurfacing gives you a like-new top layer without a full tear-out.
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Potholes are a liability. We fill them properly so they stay filled, not just patched over.
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Every good paving job starts below the surface. We grade and prep the ground right from the start.
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Define your lot edges and pedestrian paths with durable concrete curbing and walkways.
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Need to remove old asphalt cleanly before a new surface? Milling is the precise, efficient way.
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Water pooling on your lot or driveway? Proper drainage protects the whole surface from below.
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Traffic moving too fast through your lot? Speed bumps slow things down and reduce liability.
Learn MoreReach out by phone or through our contact form to describe what you need. We respond within 1 business day to schedule a convenient time to come out and look at the job in person.
We visit your property, walk the surface, and assess what it actually needs - not just what it looks like from the street. You get a written quote with a clear scope of work, so there are no surprises on the day of the job.
Our crew arrives on schedule, preps the surface properly, and completes the work cleanly. Before we leave, we walk it with you to make sure everything meets your expectations.
We hold a California state contractor's license, verifiable through the CSLB, and carry full liability and workers' compensation coverage on every project.
We have been working the South San Francisco and Peninsula market for years. We know the fog schedules, the clay soils, the permit requirements, and the neighborhoods.
We come to your property, assess the surface in person, and give you a written quote. No phone guesses, no pressure to decide on the spot.
Every project starts with a written contract that covers scope, timeline, and workmanship terms. If something does not look right after the job, we come back to address it.
Ready to get started? Call (650) 822-6266 or send us a message.
"They showed up on time, sealed the driveway in a single day, and told me upfront to keep cars off it for 48 hours given the morning fog. It has been over a year now and the surface still looks great."
Michael T., South San Francisco
Asphalt Sealcoating
"Our parking lot lines had faded to almost nothing and we were getting complaints. They re-striped the whole lot in one morning, including the accessible stalls, and had everything right before our afternoon tenants arrived."
Renee L., San Bruno
Parking Lot Striping
"We had been patching the same two potholes near the loading dock every spring. They repaired the base properly this time, and we have not had to touch it since. Worth every dollar."
David C., Brisbane
Pothole Repair
We respond within 1 business day. There is no obligation - this is just a chance for us to see your project, give you an accurate written quote, and answer your questions. After you submit, someone from our office will call to schedule a free on-site visit.
(650) 822-6266Keystone South SF Asphalt Paving is based in South San Francisco and serves 12 cities across the San Francisco Peninsula and Bay Area, including Daly City, San Bruno, and San Francisco. Most projects are scheduled within the same week as your estimate. If you are in one of the cities below, we can reach you quickly.
UV radiation is the primary cause of asphalt oxidation in mild climates like South San Francisco's - it dries out the binder that holds the surface together, causing it to gray and crack even without hard winters. Consistent UV exposure, combined with coastal fog moisture working into those cracks, accelerates deterioration faster than most homeowners expect.
Bay Area clay soils expand when wet and shrink when dry, gradually pushing and pulling at asphalt from below. Once a surface crack forms, water from South City's winter rains enters and accelerates base softening. Sealing cracks early is the most cost-effective way to prevent a surface problem from becoming a structural one.
If the base is solid, a new layer of asphalt over the existing surface - resurfacing - can restore the top at a fraction of full replacement cost. If the base has shifted or is holding water, resurfacing is a short-term fix that will fail again. The right answer depends on what is happening beneath the surface, not just on top.
A single small pothole in an otherwise solid surface is usually a contained repair. Multiple potholes appearing in the same area, or potholes that keep returning after patching, point to base failure underneath. Patching the surface repeatedly without fixing the base is money spent without solving the problem.
Ask for a California contractor's license number you can verify at cslb.ca.gov, proof of liability and workers' comp insurance, and a written scope of work before any payment changes hands. A contractor who hesitates on any of these is worth skipping. The{' '}National Asphalt Pavement Association publishes industry standards and contractor guidance that can help you evaluate quotes.
Federal ADA standards require a minimum number of accessible stalls based on total lot size, with specific width, aisle, and signage requirements. Faded or missing accessible markings create real liability for property owners. A qualified striping contractor handles the layout math and ensures your lot meets current requirements.
Keystone South SF Asphalt Paving is a licensed and insured asphalt paving contractor based in South San Francisco, CA, serving 12 cities across the San Francisco Peninsula since 2015. We hold a California state contractor's license issued by the California Contractors State License Board, which you can verify any time at cslb.ca.gov. We have completed paving, sealcoating, and repair projects across residential and commercial properties throughout San Mateo County and the greater Bay Area. Learn more about our background and how we work on our About page.
If the base is solid and cracks are hairline-level, sealcoating with crack filling is the right call - it extends the surface life for two to four years at a fraction of repaving cost.
Most contractors recommend 24 to 72 hours before vehicles return, and avoiding sharp turns or heavy vehicles for the first week or two while the surface firms up completely.
A written quote should cover: surface measurement, base preparation detail, asphalt depth and material, removal of old surface, any permit fees, payment schedule, and cleanup.
For additional guidance on asphalt maintenance standards, the U.S. Department of Transportation publishes pavement management resources that cover material standards and lifecycle planning. Ready to talk through your specific situation? Call (650) 822-6266 and we will walk you through it.
South San Francisco - known locally as "South City" - sits on the San Francisco Peninsula in San Mateo County, bordered by San Bruno to the south and Daly City to the north. The city is home to around 65,000 residents spread across distinct neighborhoods, from the hillside communities near San Bruno Mountain to the flatlands near the bay. The famous "South San Francisco - The Industrial City" sign on the hillside, visible from Highway 101, has been a local landmark for generations.
Much of South City's residential housing stock was built between the 1940s and 1970s - neighborhoods like Westborough and Buri Buri are full of ranch-style and two-story homes on smaller lots. After 50 to 70 years, driveways on these properties commonly show cracking, surface oxidation, and uneven settling driven by the area's clay soils and seasonal moisture from the Bay Area's marine climate. On the commercial side, the biotech campuses near Oyster Point and the industrial corridors near US-101 see heavy vehicle traffic that accelerates pavement wear on private lots. We work across all of South San Francisco - from the streets near Grand Avenue to the hillside neighborhoods above town - and we know what surfaces in this city actually need.
By appointment only, no walk-ins.
Keystone South SF Asphalt Paving
609 Hawthorne Pl
South San Francisco, CA 94080
(650) 822-6266estimates@southsanfranciscoasphaltpaving.comCall (650) 822-6266 or request a free estimate online - we respond within 1 business day.