Our excavation services give GCs and developers across the Greater Seattle area a sitework sub that breaks ground on time. Careful planning and direct coordination keep your project on track, on budget, and inspection-ready from the first cut to handover.
Mighty Arm's excavation services cover the sitework behind new residential and commercial builds across the Greater Seattle area, from custom homes and townhomes to condominiums, commercial buildings, and full subdivisions. We work as your excavation subcontractor, handling mass excavation, structural excavation, subgrade preparation, finish grading, and the water, sewer, and storm drainage that nearly every new development requires.
Because we carry utilities as part of our scope, you're not lining up a separate sub to trench and lay pipe. Our crews coordinate directly with your engineers, inspectors, and other trades so the next phase never waits on us.
Mass and structural excavation, grading, and subgrade preparation built to plan and geotechnical spec
Water, sanitary sewer, and storm drainage installed to correct elevation, depth, and local standards
Direct coordination with GCs, developers, engineers, and municipal inspectors
From site clearing to final restoration, our excavation services cover the full range of Division 31 earthwork and Division 33 utility work a development calls for.
Site clearing, stripping, and building pad prep that turns a raw lot into ground your crews can actually start building on.
Mass and structural excavation, cut and fill, structural fill, and compaction dialed to the survey and the geotech report.
Large-scale excavation and cut, including support for driller and soldier pile crews on shored and deep-dig sites.
Water mains, sanitary sewer, and storm drainage, from sewer excavation to final connection, set to the right depth and elevation and ready to test.
Trenching, conduit for power and comms, and gas sleeves, bedded and backfilled in coordination with your utility providers.
Utility and street improvement work in the public right-of-way, from traffic control to full restoration, built to each agency's spec.
Utility potholing to expose and locate existing underground lines before the dig, so your crews aren't finding them the hard way.
Trees, brush, and surface obstructions cleared and hauled out, opening the site so earthwork and grading can get underway.
Most delays on a jobsite trace back to the sub who didn't read the plans or didn't coordinate. Mighty Arm works the opposite way. Our excavation services run on plans reviewed before we mobilize, permits and locates handled, and clear communication from contract through final inspection.
Track Record
Projects completed for general contractors and developers across the greater Seattle area.
Clear updates from first call to close-out. GCs say it's what sets us apart.
Water, sewer, storm, and dry conduit, all carried right alongside the earthwork.
Grading, trenches, and compaction all dialed to spec so no one waits on us.
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Prevailing-wage public and federal jobs that most excavation subs choose to pass on.
Every project runs on the same four steps, so you always know where things stand and what's next.
SEE OUR FULL PROCESS
We talk through your goals, look at the site, and nail down the scope and the best way to approach it before anything moves.
We go through the plans, walk the site to check conditions, and coordinate with your engineers or GC. Then you get a detailed proposal with line-item pricing and a schedule.
Once you sign off, we handle the contract, permits, and 811 locates, then mobilize and get to work. We build to the plans, run our own checks as we go, and keep grades and compaction where the inspector needs them.
We walk the finished work against the specs, wrap up any loose ends, and hand the site over to you or the GC.
The real test of a sub is whether a GC calls you for the next job. Here's what the contractors and developers we work with have to say.
From 220+ Google reviews
Mighty Arm mobilizes to development sites within a 50 to 70 mile radius of Seattle, from Tacoma to Bellingham to North Bend. If your plat, commercial build, or public works project is in the metro, we can get crews and equipment to it.
Seattle
Bellevue
Tacoma
Everett
Lynnwood
Bellingham
Granite Falls
North Bend
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Home base & primary coverage
Plenty of excavating contractors can move dirt. What separates a commercial excavation sub worth rehiring is whether the work holds up and whether the timeline holds with it.
Excavation is the first trade in and the one everything else stacks on top of. As the earthwork contractor moving the dirt and setting the grades, we're laying the foundation the rest of the project builds on.
Every proposal for our excavation services comes from your plans, specs, and site conditions. No boilerplate numbers, no vague allowances that turn into change orders at billing.
Answers to what contractors and developers most often ask before bringing us onto a project.
We handle mass and structural excavation, grading, subgrade preparation, site preparation, and demolition, plus the wet utilities (water, sanitary sewer, storm drainage) and dry utilities (electrical and communications conduit) most developments require. We also do right-of-way work and potholing.
Either way. A lot of GCs bring us on to run everything from raw lot to finished subgrade, clearing, demolition, earthwork, grading, and utilities, all under one scope. If you only need part of that, we'll bid just the piece you want.
We do. Almost every new development needs new utilities, and we install them alongside the earthwork, so there's no separate trenching contractor to bring on.
Yes. We obtain the permits a project requires, run 811 utility locates, and coordinate directly with inspectors to keep the work inspection-ready and moving.
It depends on scope, site conditions, permitting, weather, and utility coordination. Smaller jobs can run a few days, while larger commercial and public infrastructure projects can run several weeks to several months. We lay out a schedule in the proposal so you know what to plan around.
Pricing comes from your plans and specs, not a standard rate sheet. As a reference, sitework and utilities on one to two homes typically run $80K to $150K, larger residential and commercial sitework runs $250K to $750K, and subdivisions or multi-home developments with significant right-of-way utility work run $1M and up.
Yes. We're SAM.gov registered and handle public and federal work with prevailing-wage requirements, including street improvements and utility infrastructure, projects that carry more paperwork than many contractors want to take on.
We warrant our workmanship for one year from substantial completion. Manufacturer warranties on supplied materials pass through to the owner. The warranty excludes damage caused by others, settlement beyond normal tolerances, misuse, or changes in site use.
Send us your plans and scope and we'll put together a detailed, project-specific proposal.
Give us the basics and a quick description of the scope. We'll take it from there.
Commercial excavation, site prep, and demolition for general contractors and developers across Greater Seattle.
License: MIGHTAE766QK
UBI: 605-632-469
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