We dig driveways down to solid ground, haul off the topsoil and soft spots, and set the base depth and slope that keep them from rutting or cracking. That covers new driveways, widened ones, long gravel drives on acreage, RV pads and side-yard parking.
Boise Driveway Excavation for New and Wider Driveways
A driveway looks simple from the street. What holds it up is the part nobody sees: the dirt that came out, the base that went back in, and the slope that moves water off it. Skip any of those and you get ruts in a gravel drive, or cracks in a concrete one after a couple of winters.
We dig driveways in Boise and around the valley, including Meridian, Eagle, Kuna, Star and Middleton. We work out of Caldwell, so Canyon County acreage is close by. Most jobs fall into three groups: a new driveway for a new build, a wider drive or extra parking pad at an existing home, or a long gravel drive out to a house, shop or barn.
Digging Out to Subgrade
The first job is getting down to soil that can carry weight. Sod and topsoil come off first, because organic material keeps settling as it breaks down. Under that is the subgrade, the native ground the base will sit on.
Some spots don't pass. Wet clay that squishes underfoot, loose fill left from when the house was built, a buried stump or an old backfilled trench all count as soft spots. We dig those out and replace them with compacted material instead of covering them up. On a lot in Meridian or Nampa we may hit caliche a foot or two down, which is hard to dig but solid to build on. Our compaction page explains how the subgrade and base get packed.
On a new build, watch the strip next to the garage. That ground is usually foundation backfill, and it often hasn't settled. It's also where garage aprons tend to crack first, so we check it closely and dig out anything loose before base goes in.
How Much Base a Driveway Needs
Depth depends on the soil, the surface and what's going to drive on it. A concrete driveway for two cars on firm ground needs a lot less than a gravel drive that sees a loaded hay truck or a fifth-wheel. As a rough guide:
- Concrete or asphalt driveways usually get a few inches of compacted gravel base. Your concrete or paving contractor will tell us what they want under their work.
- Gravel driveways need a thicker section, since the gravel is both the base and the surface. Heavy trucks, soft clay or a low wet spot call for more.
- Soft or wet ground can need extra dig-out, and sometimes a fabric layer to keep the base from pushing down into the mud.
If an old driveway is in the way, it has to come out first. Our driveway removal page covers that part. Pulling the old slab also shows what was under it, which is often why it failed: a thin base, no base at all, or clay that stayed wet. We look at that ground before setting the depth for the new one.
Gravel Driveways on Acreage and Ditch Crossings
Around Star, Kuna, Middleton and Parma, a lot of driveways are long gravel runs back to a house, shop or barn. Those are mostly about water. A gravel drive that sits lower than the field next to it becomes a ditch every spring. We crown it or tilt it so water sheds off one side, and build it up where the ground is low.
Many acreage driveways cross an irrigation ditch near the road. That crossing needs a culvert sized for the flow, set at the ditch grade, with enough cover over it that it won't get crushed. These ditches are often owned by an irrigation district or ditch company, so they usually have to sign off first. The work also tends to wait until the water is off, since irrigation season runs roughly April to October. For new or reshaped ditches, see ditch digging.
RV Pads and Side-Yard Parking
Side-yard RV parking is one of the most common driveway add-ons we dig, usually a gravel or concrete pad beside the garage with a wider curb cut or gate. Sprinkler lines, a gas meter and fence posts tend to be in the way, so we walk it with you first. Digline (811) marks public lines but not your sprinklers or the wire out to the backyard lights. In Meridian, Eagle and Star, check your HOA rules early, since many limit where an RV can park and what surface the pad can be.
Slope and Drainage Away From the Garage
A driveway should carry water toward the street or off to the side, never back at the garage door. We set that fall in the subgrade, so the base and the finished surface follow it. Driveways that dip toward the house, which we see on older Boise lots and on homes that sit below the street, may need a trench drain at the garage or a dry well to take the water. Our drainage solutions page covers those fixes.
Approach Permits and the Road Side of the Job
The part of the driveway that meets a public road is the approach, and whoever owns the road controls it. In Ada County, the Ada County Highway District (ACHD) handles most public roads and approaches. In Canyon County it's usually the city or the local highway district. A new approach, a wider curb cut or a culvert in the road ditch generally needs a permit first, and the agency may set the width, location and surface. We'll tell you who to call before we dig.
What Changes the Time and Cost of a Driveway Dig
Length and width set the baseline. After that, it's how deep we have to go to reach firm ground, how much dirt leaves versus stays on the lot, and how far it travels. A culvert, a sprinkler system to reroute, a fence section to pull or a tight side yard all add time. Before we start, decide on the finished surface, get your concrete or paving contractor's base depth, and have any approach permit or HOA approval in hand.
Driveway Extensions
Widening a driveway or adding a parking pad beside it is the same dig as a new driveway, tied into what's already there. We dig the new area down to firm subgrade, set the base so the extension sits at the same height as the old driveway and drains the same direction, and keep the edge of the existing slab or gravel clean for the next crew. If the old edge is cracked or settled, it's often worth cutting back to sound concrete first. A wider approach at the street may need a permit from the city or highway district.
Why Hire Ultimate Excavation LLC for Your Driveway
We're an Idaho registered contractor (RCE-65836) with a 5.0 rating on Google, and Tanner is the one you'll deal with from the bid to the final grade. Our reviews mention quick bids and showing up before the rains came, which matters on clay ground. When the base is ready, we hand it to your concrete or paving crew, and our paving job site preparation page explains that handoff. Call (208) 697-2429 or request a free estimate.
