Foundation Excavation in Hillsboro, OR

Foundation excavation in Hillsboro is precision digging — footings, stem walls, basements, and crawl spaces dug squared, to depth, and to spec so your concrete crew can pour without fighting the hole. Hillsboro Excavation Co. digs foundations for new homes, additions, shops, and light commercial across Hillsboro and Washington County. It's the excavation job with the least room for error: the dimensions are on the plans, and the hole has to match them.

Digging a foundation in the Willamette Valley means dealing with what's underground here — heavy clay that holds water, a winter water table that can seep into an open excavation, and basalt rock a few feet down in parts of the county. A foundation dug without accounting for water and soil ends up with soft, wet, or caving walls and a footing that isn't sitting on solid bearing. We dig it right, keep it stable, and hand your concrete crew a clean, square, to-depth excavation.

Our Hillsboro Foundation Excavation Services

Hillsboro Excavation Co. digs every kind of foundation excavation to plan:

• Footing trenches — dug square, to width, and to depth so the footing sits on solid, undisturbed bearing soil.
• Basement excavation — full-depth digs with stable walls and room for the crew to form and pour.
• Crawl space excavation — dug to the right depth and grade, with drainage in mind.
• Stem wall and grade beam digs — precise trenching for the wall type on your plans.
• Over-excavation and structural fill — digging out soft or wet soil and replacing it with compacted rock for solid bearing.
• Footing and foundation drains — installed as we go so water is managed before the concrete's in.

Squared, To-Depth, and Ready for Concrete

A foundation excavation lives or dies on accuracy. We set layout to the plans, dig footings to the exact width and depth so the concrete forms drop right in, and keep the bottom on undisturbed or properly compacted bearing soil — not loose fill that settles under the load. Where the plans call for it, we over-excavate soft spots and bring in compacted structural rock. The goal is a hole your concrete crew can form and pour in without re-digging, re-squaring, or waiting on us.

Keeping water out of the hole

In Hillsboro, the hardest part of a winter foundation dig is often the water. We time excavation to the pour so an open hole isn't sitting full of rain for a week, install footing drains and sumps where needed, and keep the excavation from turning to soup. Managing water during the dig is what separates a clean foundation from a delayed, muddy mess.

Foundations in a Growing Hillsboro

Hillsboro is building, and foundations are going in across very different ground. Out in South Hillsboro — annexed farm land once run as a hobby farm by William Ladd and Simeon Reed — crews are digging footings into old agricultural soil that was tilled and reworked for a century. Around Amberglen and the tech corridor near the Silicon Forest industrial district, where over half the city's jobs sit, it's tighter infill and commercial pads. Near Orenco, the former Oregon Nursery Company townsite, it's a mix of established lots and new construction. Each of those grounds digs differently, and we've dug footings across all of them.

The one constant in a Hillsboro foundation dig is water. On the flat Tualatin Valley floor at about 194 feet of elevation, the winter water table sits high, and an open footing trench dug in December can take on groundwater fast. We time foundation excavation to the pour, install footing drains and sumps where the water calls for it, and dig to solid bearing below the reworked topsoil — so your concrete crew forms and pours on stable ground, not in a hole that's filling in from the bottom.

How Much Does Foundation Excavation Cost in Hillsboro, OR?

Foundation excavation in Hillsboro for an average home typically runs $2,000 to $6,500, with the number driven by foundation type, depth, soil and rock conditions, and access. Footing and crawl-space digs are on the lower end; a full basement excavation with haul-off runs higher. Excavator-and-operator time runs about $110 to $190 per hour, spoil haul-off runs roughly $60 to $120 per cubic yard, and structural rock for over-excavation runs about $35 to $60 per ton. Below are typical ranges across Washington County.

Permits, Inspections, and Coordination

Foundation excavation is tied to the building permit and gets inspected — a footing inspection usually happens after the dig and before concrete. Hillsboro Excavation Co. digs to the inspected plan, coordinates timing with your general contractor and concrete crew so the footing inspection and pour line up, and handles erosion control the county requires. We work as the excavation piece of your build, on your GC's schedule, so nobody's waiting on the hole.

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