Concrete companies in Seattle: 398 locations, 293 concrete specialty registrations and the rule on subcontracting

This report is for Puget Sound homeowners, builders and property managers hiring a concrete contractor or choosing a ready-mix supplier, and for B2B sellers whose customers are concrete firms: rebar fabricators, pump and forming suppliers, equipment dealers, insurers, estimating services and software.

Where the crews are

Figures for the Seattle-Tacoma-Bellevue, WA Metro Area (CBSA 42660), combining NAICS 238110 (Poured Concrete Foundation and Structure Contractors) and NAICS 327320 (Ready-Mix Concrete Manufacturing). Source: US Census Bureau, County Business Patterns 2023.

King's and Snohomish's combined employee totals were published but flagged as high-noise (the Census Bureau's confidentiality noise moved them by 5% or more), so we don't use them. The contractor-only figures are solid: 2,066 employees at King County contractor locations, 1,660 in Snohomish and 1,068 in Pierce.

A contractor in Lynnwood or Marysville is as likely to pour your Seattle foundation as one in the city. Shortlist by the region, not the ZIP code.

The market in numbers

The contractor row for 250 or more is the total less the published classes. Three ready-mix establishments fall in classes the Census Bureau doesn't publish. Overall, 334 of the 398 locations have fewer than 20 employees.

These are establishments with paid employees, not companies. Owner-operators without payroll aren't counted, and a producer with several plants counts each one.

Washington's registry, and what a specialty registration allows

Every contractor in Washington registers with the Department of Labor and Industries (L&I), either as a general contractor or as a specialty contractor in one of the state's specialties. Concrete is one of them.

L&I publishes its registrations as open data. On 30 October 2026, 750 active registrations statewide named concrete as a specialty, and 293 had addresses in the three metro counties (we placed each ZIP code in the county holding most of its land, using the Census ZIP-to-county file): King 106, Snohomish 97 and Pierce 90. Of those 293, 182 are LLCs, 65 corporations and 41 individuals. General contractors who also pour concrete don't appear in that count.

Worked example: a quote that breaks the specialty rule

Illustrative example. The job and firms are invented.

An Everett homeowner gets two quotes for a new driveway with a trench drain tied into the storm line.

Quote A is $1,700 cheaper, but a specialty contractor can't hire subcontractors, so the drain work either isn't really covered or is being done outside the rules. The bond also matters: it's the pool of money for claims against that contractor, shared among everyone who claims. Ask Quote A to drop the drain and hire a separate registered contractor for it, or go with Quote B.

The plants

Thirty-three ready-mix establishments serve the metro, and their average pay of $100,520 is higher than in Chicago ($85,009) or Phoenix ($74,724). Plants that discharge process water or stormwater are covered by the Department of Ecology's Sand and Gravel General Permit, which covers concrete batch and hot-mix asphalt operations as well as pits and quarries; the current permit took effect on 1 April 2026 and runs to 31 March 2031.

None of the SEC-registered listed concrete companies is based in the Seattle metro. Two listed producers report Washington operations: Knife River (Bismarck, ND), whose West segment, covering Alaska, California, Hawaii, Oregon and Washington, ran 51 ready-mix plants at the end of 2025; and Martin Marietta, whose West division includes Washington and whose February 2026 exchange with Quikrete added aggregates operations including Vancouver, British Columbia.

Selling to Puget Sound concrete firms

The L&I data gives you the concrete specialty list with business type and registration dates, and L&I's separate insurance and bond files add carriers and expiration dates. Sellers of tools, rental, rebar and forming should cover all three counties; a plant-side seller has 33 locations. Because specialty contractors can't sub out work, they hire or rent everything they need, which makes them good customers for equipment rental and labor. For finding the right person, see how to find decision makers. Bebop can find concrete firms that match a description like this and research each one.

Illustrative example. A rebar fabricator in Kent (pugetrebar.example) targets the 293 concrete specialty contractors plus the general contractors who self-perform foundations. Applying the Census share of contractor locations with ten or more employees (94 of 365, or 26%) suggests about 75 firms big enough to buy by the ton. At a 12% reply rate that's 9 conversations; three accounts buying 80 tons a year at $1,400 a ton is $336,000 a year.

Subject: Cut and bent rebar, delivered to the pour

Hi [first name],

[Company] is registered in Washington's concrete specialty, so I'm guessing foundations and walls keep your crews moving between [county] sites.

We cut, bend and tag rebar to your takeoff in Kent and deliver to the site in [days], sequenced by pour.

Could I price your next job from the drawings?

[Your name]

Local sources

Next step: for the builders and trades around these firms, read the report on construction companies in Seattle.