Asphalt Paving and Driveways in Denver, CO

Asphalt driveway installation means digging down to firm ground, building and compacting an aggregate base, and placing hot-mix asphalt in one or more layers, and around Denver the part that decides how long the result lasts is the ground and water beneath it. Clay that swells when wet sits under parts of the metro, and the Colorado Geological Survey counts cracked driveways and heaved roads among its effects. A good paving contractor spends more time on grading, drainage and base compaction than on the black surface everyone sees, and plans the connection to the street around the city's curb-cut rules before the first truck arrives.

Thickness and base come first. Angi's 2026 asphalt driveway guide puts the minimum asphalt thickness at 2 inches and recommends 4 to 6 inches for durability, laid over a compacted aggregate base. Over expansive clay, water is the enemy: USGS work on heaving ground near Denver found that heave shrank as the depth of soil or fill over the swelling bedrock increased, becoming small where 10 feet or more covered it. No driveway gets 10 feet of fill, so the practical defense is keeping water out of the subgrade, with the finished surface sloped away from the house and downspouts discharged well clear of the edges.

Permits depend on where the driveway meets the public way. Denver's development guidance says moving a street-facing driveway or changing its curb cut requires transportation review, while alterations to a driveway that connects to an alley do not. Work that occupies the street, sidewalk or alley needs a right-of-way permit, and the guidance leaves owners responsible for improvements they install between the property line and the curb, though sidewalk repair itself is now funded through a citywide sidewalk charge. Many older lots in the city load from alleys, which the city maintains; the private pad beyond the alley edge is the owner's to pave.

The hot-mix season is a warm-weather one. A Colorado paving contractor's published guide describes late spring through early fall as the ideal window, and the airport's median freeze dates of May 6 and October 6 frame it. The city runs a large paving program of its own, with more than 450 lane miles of milling and repaving planned for 2023 and asphalt from its own plant, and its standard mill and overlay grinds off about the top 2 inches before replacing them. The same approach works on a private driveway whose base is still sound.

Choosing between overlay and replacement comes down to the base. An overlay, $3 to $7 per square foot in Angi's 2026 guide and $2 to $4 in the Colorado contractor's figures, suits pavement that is worn but firm. Alligator cracking across much of the surface, heave, or water running toward the garage calls for tear-out and a new base; Angi's Denver guide puts new asphalt at $3 to $7 per square foot, and national replacement figures run $8 to $15. New asphalt then needs time before its first seal, at least 30 to 60 days by one maker's guidance, which in practice means sealing the following summer. See driveway sealcoating and the cost page.