A master-planned ranch community

Asphalt Paving in Diamond Bar, CA

Homes on the hills around the valley floor, built from 1959 on.

Free on-site estimates
Itemized written quote before work starts
Base depth and asphalt thickness stated in every quote

Paving on Diamond Bar's Hills

Asphalt paving in Diamond Bar is mostly hillside work. Diamond Bar Boulevard runs along the valley floor, and the housing developments rise on the hills around it. The city grew out of the Diamond Bar Ranch, once one of the largest working cattle ranches in the West, which Transamerica Corporation bought in the 1950s to build a master-planned community. The first houses went up in 1959.

Housing ages

Diamond Bar grew from 10,576 residents in 1970 to 28,045 in 1980 and 53,672 in 1990, then leveled off; the 2020 census counted 55,072. The city incorporated on April 18, 1989. Most homes were built between the 1960s and 1990s, so driveways and private streets are now old enough to need overlays or replacement.

Hillside driveways

Driveways on hillside lots tend to be steep and sometimes curved. Water runs fast on those surfaces, so we shape them to carry runoff to the gutter or a drain, and we seal cracks before the rainy season. On steep grades, we compact the base thoroughly and roll carefully so the asphalt does not shift.

Ground movement

Diamond Bar lies between the ends of the Chino and Whittier faults, part of the Elsinore Fault Zone. On hillsides, slow soil movement as well as traffic can crack pavement. If cracks keep reopening in the same line, we look at the slope before recommending a fix.

Commercial and HOA

State Route 60 and State Route 57 run through the city, with Interstate 10 just north. Shopping centers are scattered throughout. HOA streets, gated entries and community lots need routine sealing, crack filling and striping.

Typical Diamond Bar jobs

Replacing steep, curved driveways from the 1970s and 1980s
Milled overlays where the base is still sound
Adding drains or berms to stop runoff from reaching garages
HOA street overlays and crack filling, phased for resident access
Retail lot repair and restriping near the 60 and 57

Hillside lots often have limited space for equipment and materials, so we plan access, staging and parking for trucks with you before the work date.

Planning a Diamond Bar project

Diamond Bar averages about 17 inches of rain a year, with February the wettest month at nearly five inches. On hillsides, that rain arrives fast. We schedule hillside replacements outside the rainy season where we can, and we recommend crack filling and sealing in late summer or early fall. The annual mean high is about 78 degrees and the record is 113, so on hot summer days paving starts early.

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Diamond Bar at a Glance

From ranch to suburb. Transamerica Corporation acquired the Diamond Bar Ranch in the 1950s to develop a master-planned community, and the first houses were built in 1959. The city incorporated on April 18, 1989.
Fast growth. Diamond Bar grew from 10,576 people in 1970 to 28,045 in 1980 (up 165.2 percent) and 53,672 in 1990. The 2020 census counted 55,072.
Hills and faults. Housing developments sit on the hills around the valley floor, and the city lies roughly between the ends of the Chino and Whittier faults, both part of the Elsinore Fault Zone.

Our Services in Diamond Bar, CA

Diamond Bar Questions

Can a steep, curved driveway be paved with asphalt?

Yes, with a well-compacted base and careful rolling. On very steep grades we may recommend concrete.

Why does my hillside driveway crack in the same place?

It can be slow ground movement rather than wear. We check the pattern before quoting a repair.

Do you work with Diamond Bar HOAs?

Yes, on private streets, gated entries and community lots.

My driveway slopes toward the garage. Can you fix that?

Often, by reshaping the surface and adding a trench drain or swale at the garage. If the grade cannot be changed enough, a drain is the reliable fix.

Is there enough room for paving equipment on my lot?

Usually. We use smaller equipment where needed and plan staging at the estimate.

When should I replace a hillside driveway?

Ideally between spring and fall, outside the rainy season, so the new base is not exposed to heavy runoff mid-job.

My HOA street has lots of cracks. Where should we start?

Usually with crack filling and patching the worst areas, then a sealcoat. If the street has widespread alligator cracking, an overlay or reconstruction plan is the next step.

Do you remove the old asphalt before paving a steep driveway?

Usually, yes. A new surface on a failed base will crack again, and removal lets us correct the slope and drainage too.

Free Estimates in Diamond Bar, CA

Free estimates for Diamond Bar homes and HOAs.

Call (909) 612-9922 Free Estimate