Looking for an excavation contractor in Seattle, WA? Describe your project once and up to three excavation contractors who work in Seattle and King County get back to you with a quote. It's free and there is no obligation.
Seattle is home to about 780,995 people (2024 Census Bureau estimate), a growing community (+6.0% since 2020). With 9,298 people per sq mi, it is a densely built-up area. New homes, additions and utility connections keep local excavation contractors busy.
Seattle at a glance
- Population (Census Bureau estimate, 2024)
- 780,995 (+6.0% since 2020)
- Rank in Washington
- 1st of 281 cities and towns
- Land area
- 84 sq mi
- Population density
- 9,298 people per sq mi (densely built-up)
- Type
- City (Seattle city)
- Main county
- King County
What to check before hiring in Seattle
- Call 811: required before digging, in Washington as everywhere.
- Permits: grading, foundations and utility work may need permits from the city or county.
- Soil and rock: ask how unexpected rock or poor soil is priced.
- Price drivers: volume, depth, access, haul-off and backfill.
Useful official resources
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Call 811
Official information and guidance.
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OSHA: trenching and excavation
Official information and guidance.
Services available in Seattle
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Foundation and basement excavation
Digging for a foundation, basement or addition, with backfill.
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Utility trenches and site work
Trenches for water, sewer and power, building pads, driveways and grading.
Frequently asked questions in Seattle
How much does excavation cost in Seattle, WA?
It depends on the volume, depth, soil and haul-off. Describe your project: contractors who serve Seattle reply with a quote.
How long does it take?
A house foundation often takes a few days; larger site work longer.
Who hauls the dirt away?
Ask: haul-off and disposal are often priced separately.
Which excavation contractors will contact me?
Up to three independent excavation contractors who serve Seattle and the surrounding area, chosen for the service you need. Your details are shared only with your consent.
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2024) and Gazetteer Files (public domain), imported on 10/31/2026. Figures describe the incorporated place or county as published; they are shown for information only.