Driveways and private roads
A driveway is a road with the same three layers and the same failure modes, just shorter. Most of the bad ones in this county are bad for one of two reasons: not enough rock under them, or water that has nowhere to go.
A public street a city will accept for maintenance. Built to the standard plan, inspected at every lift.
Typical R-value design for a residential street. The soils report sets the real numbers.
Feeds it8″ of base over 1,000 sq ft is about 48 tons, or 2 transfer loads. Our trucks, our rock.
Three ways to surface it
Gravel is the cheapest per foot and the right answer for a long rural drive. It needs a crown, a ditch, and a grader every few years, and in exchange it costs a fraction of pavement and is easy to repair.
Chip seal sits in between: an oil and rock surface over a compacted base. It sheds water, it does not track mud, and on a long drive it costs far less than asphalt. It is not as smooth and it throws loose rock for the first few weeks.
Asphalt is the smooth one, and it is the only one that makes sense close to the house or where you are turning and parking every day. It needs the same base as a street, which is where most cheap driveways go wrong.
- Gravel: 4 to 6 inches of Class 2 base, crowned, with ditches
- Chip seal: base plus an oil and screening surface
- Asphalt: 2 to 3 inches over 4 to 6 inches of compacted base
- Concrete aprons where the drive meets the garage or the road
The approach, the culvert, and the encroachment permit
Where a private drive meets a public road, the county or the city usually requires an encroachment permit and a standard approach, and often a culvert sized so the roadside ditch keeps flowing. That culvert is where a lot of driveways fail: crushed, silted in, or never installed, and then the ditch runs across the drive and takes it out.
We pull the permit, build the approach to the standard detail, and size the culvert to the ditch rather than to what fit on the truck.
Fire access on rural lots
On a new rural build, the driveway is an access road with rules: a minimum width, a maximum grade, an all-weather surface, and a turnaround a fire engine can use. Cal Fire and the county will inspect it, and a driveway that does not pass holds up the occupancy permit.
Tell us the parcel and the fire agency and we will build to their standard the first time rather than after the inspection.
Rebuilding a driveway that keeps failing
The pattern we see most: a thin mat laid straight on native ground, cracked in the wheel tracks within three years. The fix is not another skin. It is pulling the surface, fixing the drainage, putting real base under it, and paving that. It costs more once and much less over ten years.
What a driveway runs
| Item | Range |
|---|---|
| Gravel driveway, base placed and compacted | $3 to $7 per SF |
| Chip seal over prepared base | $2.50 to $5 per SF |
| Asphalt driveway, base and mat | $6 to $12 per SF |
| Culvert and approach at the road | $3,500 to $12,000 |
| Regrade and re-rock an existing gravel drive | $1.50 to $4 per SF |
| Concrete apron | $12 to $20 per SF |
Unit ranges are what this kind of work has been going for in the Sacramento Valley, put here so you can sanity-check a budget. They are not a bid. Quantities, access, haul distance, and the spec move every one of them.
Questions we get
Four inches compacted for cars, six where a delivery truck or an RV uses it. Length times width times depth over 27 gives cubic yards, and the calculator on the trucking page turns that into tons and truckloads.
On anything over a couple of hundred feet, usually yes. You get a surface that sheds water and does not turn to mud, for well under the cost of asphalt. Near the house, most people still want asphalt or concrete.
Those are the wheel paths, and cracking there is a structural failure, not a surface one. There is not enough base under it or the subgrade is wet. Paving over it buys a couple of years.
Yes, and a lot of them, because a rebuild lot needs an access road that meets the current fire standard before the house can be finaled. Grade, width, and turnaround all get checked.
Photos are stand-ins until our own job photos are up: public domain images from the U.S. Army Corps of Engineers and the National Park Service, plus freely licensed photos from Wikimedia Commons (CC0 and CC BY-SA 4.0).
Request a bid: driveways and private roads
Scope, rough quantities, the town, and when the site is available. If there is a bid date on it, put the date and time in and we will confirm receipt the same day.
- The yard
- (530) 555-0142
- Bids and plan sets
- bids@northstateconstruction.com
- Where we work
- Butte, Glenn, Tehama, Colusa, Shasta, Sutter, and Yuba counties
- Yard at 4180 Midway, Chico, CA 95928
CSLB Class A General Engineering · license pending, expected June