Earthwork is everything that happens to the ground before anything gets built on it. Soil gets moved from where it is to where it needs to be, shaped to the right elevations, and compacted so it holds up. The individual services we offer in this category are listed below.
An Earth Works Company in Boise and Canyon County
Excavation is about digging down. Earthwork is the bigger picture of what happens to a piece of ground: where the high spots go, what fills the low spots, how the water runs off, and how firm the dirt is under the slab, the shop or the driveway.
We do earthwork from our base in Caldwell out to Boise, Star, Kuna, Middleton, Nampa and Meridian. Our customers include homeowners, builders, landowners and general contractors. Some bring us an engineered grading plan with every elevation marked. Others bring a lot that floods each spring and a rough idea of where the shop should go, and we start from there.
Moving, Shaping and Compacting
Almost every earthwork job comes down to three things done in the right order. Grade a pad before the fill under it is compacted and it sinks. Spread topsoil before the drainage is set and it washes into the low corner. The pages listed in this category each cover one of these steps in more detail.
Moving
Soil gets cut from one place and placed in another, or it gets trucked in or out. On acreage that might mean building up a barn pad or leveling an arena. See earthmoving services.
Shaping
The ground gets cut to the elevations on the plan, whether that's a flat pad, a gentle slope away from a house or a swale along a property line. On new homes the first big step is the site cut. At the end of a job, topsoil spreading gives lawns and beds something better to grow in than native clay or caliche.
Compacting
Fill gets placed in thin layers, called lifts, and each lift is compacted at the right moisture before the next one goes on. Skip that and the ground settles under whatever sits on it. See compaction.
Planning Earthwork Before the Machines Show Up
A few decisions up front change how the whole job goes. Where should the finished pad or yard sit compared to the street and the neighbors? Can the dirt from the cut be reused, or does it have to leave? Is there topsoil worth saving in a pile for later? Where will trucks get in without crossing a septic field or a new driveway? Settling those before the first cut keeps dirt from being moved twice, and moving dirt twice is where earthwork budgets go sideways.
Earthwork on a Home Lot
On a single lot the work is tight and the margins are small. The pad has to hit its elevation, the foundation excavation has to be backfilled without pushing on the walls, and the final grade has to fall away from the house. Utility trenches for water, sewer and power cross the yard and need to be compacted so they don't sink in a year. See underground utilities.
Older Boise neighborhoods add their own wrinkles. In the North End or on the Bench, lots are narrow, the trees are big, and the only way into the backyard might be a side yard a small machine barely fits through. A modest job there can take longer than a bigger one on an open lot in Kuna.
Earthwork on Acreage
Out past Star, Kuna and Middleton, the jobs get wider. Shop and pole barn pads, horse arenas, long gravel driveways, ponds and fields that need to drain toward the right ditch. Acreage also comes with irrigation laterals, headgates and ditch company easements, so a big part of the planning is figuring out what water crosses the property and who controls it.
On irrigated ground, a building pad should sit high enough that flood or sprinkler water runs around it instead of into it. Arenas need a firm, well-drained base under the riding surface, or they turn to mud every April. Long driveways need a crown or a slight cross slope so water sheds off the gravel rather than running down the ruts.
Earthwork for Commercial and Multi-Lot Sites
Commercial pads and small developments are built to civil plans, with surveyor stakes, compaction testing and erosion control. Sites that disturb an acre or more generally need construction stormwater permit coverage. Our part is building to the stakes, placing fill the way the geotechnical report calls for, and keeping silt fence and the construction entrance working until the site is stabilized. For multi-lot work, see subdivision earthworks.
What Good Earthwork Looks Like a Year Later
You find out whether earthwork was done right after a winter and an irrigation season. A fresh grade always looks good on the day the machines leave, so the real test comes later. Here's what to watch for:
- Slabs and driveways stay flat. Cracks and sunken corners usually mean fill wasn't compacted in lifts.
- Water leaves the house. The code calls for at least 6 inches of fall in the first 10 feet. Puddles against the foundation mean the grade was lost or never set.
- Trench lines don't show. A sunken stripe across the lawn is a trench that was backfilled in one pass.
- Slopes hold. Cut banks in the foothills and berms on acreage shouldn't wash out after the first hard rain.
Most of these problems trace back to how the ground was treated before anything went on top of it. Clay that was too wet when it was compacted is a common cause in this valley, especially on jobs pushed through in a rainy spring.
Why Hire Ultimate Excavation LLC
We're a registered Idaho contractor (RCE-65836) with a 5.0 rating on Google. Our reviews call us "knowledgable, respectful and budget friendly" and "great for earthwork services on your projects." Call (208) 697-2429 or request a free estimate.
