Excavation Contractor in Cornelius, OR

Hillsboro Excavation Co. works in Cornelius every week. We are based one town east, straight down Tualatin Valley Highway, which means our equipment is on your lot in minutes rather than billed as an hour of windshield time. Cornelius sits between Forest Grove to the west and Hillsboro to the east, and that whole corridor is the ground our crew knows best — the same Tualatin Plains soil, the same winter water table, the same county inspectors.

Cornelius is a compact city, about 2.3 square miles, with roughly 4,843 households at an average of 2.91 people each. It counted 12,694 residents at the 2020 census and is estimated near 15,520 by 2025. That growth is the reason excavation work here has shifted: more infill construction on tight lots, more additions and ADUs squeezed beside existing homes, and more drainage work on properties that were never graded for the density around them now.

What Makes Digging in Cornelius Different

Cornelius sits on the floor of the Tualatin Valley, and the ground reflects it. This is old farm country — the Cornelius family settled these plains in 1845, and the area was known as Free Orchards long before it was a city. Generations of agricultural use left topsoil that looks excellent and drains poorly, sitting over the heavy silty clay that runs under most of Washington County.

That matters on a job site in two specific ways. First, from roughly October through May, that clay holds water. A trench dug in February is a different job from the same trench in August, and pretending otherwise is how contractors end up compacting mud and calling it a base. Second, the flat valley floor gives you very little natural fall to work with. On a lot with two feet of grade change, you plan drainage around what the site gives you. On a Cornelius lot that is nearly level, you have to build the fall in deliberately — which is a design decision made before the machine ever starts, not a fix applied afterward.

Tight lots on a small footprint

At 2.3 square miles for a city pushing 15,000 people, Cornelius lots are not sprawling. A great deal of our work here is access work: getting a machine into a back yard between an existing house and a fence line, protecting the driveway and the street, and hauling spoils out without turning the neighbor’s frontage into a staging yard. We size equipment to the opening we actually have rather than the one we wish we had, and we plan the haul route before the first bucket comes out.

The Work We Do Most in Cornelius

With an average home price around $475,860, property owners here are making real investments and expect the dirt work under them to be done properly. The jobs that come up most often:

• Drainage and French drains — the single most common call in Cornelius. Flat ground plus clay soil plus a wet season equals standing water against foundations, saturated back yards, and crawlspaces that never fully dry.
• Site preparation for additions, ADUs, shops, and new builds on infill lots, including the cut, fill, and compaction that keeps a slab from settling.
• Utility trenching for water, sewer, power, and irrigation runs, dug to depth, bedded, and backfilled to code.
• Grading and leveling to establish positive drainage away from structures — the fix that prevents drainage problems instead of treating them.
• Gravel driveways and parking areas built on a compacted base so they do not rut through the first wet winter.
• Land clearing on the larger parcels toward the edges of town and out along the highway.

If you are weighing a project and are not certain which of these it actually needs, that is a normal place to start. Describe the problem and we will tell you what the work involves — a Hillsboro excavation contractor that sends a person to look at the site before quoting is giving you a real number instead of a guess.

Permits, Inspections, and Working Clean

Every job listed above is run by the same Hillsboro excavation crew and equipment. Cornelius is in Washington County, so the regulatory picture is the one we work under every day: county and city permitting for grading and utility work, Clean Water Services erosion-control requirements on sites that disturb ground, and the 811 locate call before any dig. We handle silt fence, rock construction entrances, and inlet protection as part of the job rather than as an afterthought once an inspector flags it.

The practical benefit of hiring a crew from the next town over is scheduling. When an inspection reschedules or a weather window opens for two days in March, we can move equipment quickly instead of fitting Cornelius into a route from across the metro.

Excavation Services We Provide in Cornelius

Every service below is run by the same crew of excavation contractors in Hillsboro, OR that works Cornelius. Click through for scope, process, and what actually drives cost on each one.

Specialist Excavation Work in Cornelius

Two Cornelius jobs come up often enough to have their own pages, because tight infill lots change how both are done. Everything else our Hillsboro excavation crew handles is on the main page:

If your project is not one of these, describe it and we will tell you plainly what the work involves — our excavation services page lists the full range.

If your project is not one of these, describe it and we will tell you plainly what the work involves — our excavation services page lists the full range.

All Cornelius services · How we scope a job · Start from the homepage

Frequently Asked Questions

Nearby Communities We Serve

Banks · North Plains

Hillsboro excavation contractor · Hillsboro Excavation Co.