KLB Construction

What KLB Construction does

KLB Construction is a family-owned heavy civil contractor founded in 1984 by Kelly Lynn Bosa and headquartered in Mukilteo, Washington. The company self-performs highway, transportation, and transit infrastructure alongside site development and environmental remediation work for public agencies and general contractors across the Pacific Northwest. Its operations are anchored by an owned equipment fleet and a craft workforce that has scaled to approximately 300 employees, enabling it to compete for multi-million-dollar corridor and interchange projects for WSDOT and King County. A 0.49 Experience Modification Rate and 23 consecutive years on the AGC Safety Team — capped by a 1st place AGC of America Construction Safety Excellence Award — function as gating credentials for public-works prequalification.

The business model is project-based and bid-driven. KLB pursues work through two channels: direct low-bid and best-value procurement with public owners (primarily WSDOT and King County), and subcontracting to general contractors on larger design-build or corridor programs. Revenue is recognized as projects are executed against unit-price or lump-sum contracts, with margin driven by crew productivity, equipment utilization, and self-performed scope. Safety performance and bonding capacity are decisive inputs to bid eligibility, and the company has used its safety track record to deepen incumbency on key corridors including I-405/SR 167, I-90, and SR 18.

Strategically, KLB has remained focused on its Pacific Northwest home market while selectively extending into adjacent verticals such as utility-scale renewable energy site work, evidenced by the Goose Prairie Solar Project. The firm is privately held with no external funding rounds and continues to invest in workforce development through university campus recruiting, signaling a build-and-retain talent model rather than acquisitive growth.

Name

KLB Construction

Legal name

KLB Construction, Inc.

Website

https://klbconstruction.com

Company type

Private

Founded year

1984

Operating status

Operating

Headcount range

101–250 employees

Short description

KLB Construction is a family-owned heavy civil contractor founded in 1984 and based in Mukilteo, Washington. It self-performs highway, transit, and site development work for WSDOT, King County, and general contractors across the Pacific Northwest, and has roughly 300 employees.

Ownership category

akta.pro rank

Headquarters

HQ city

Mukilteo

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Revenue model

1. Heavy Civil Construction Contracts: KLB generates revenue through fixed-price or cost-plus construction contracts on public infrastructure projects including highway construction, transportation improvements, site development, and environmental remediation. Revenue is project-based and cyclical with contract awards.

Pricing tiers

Go-to-market motion2 records

Distribution channels2 records

Marketing channels4 records

Core offering

KLB Construction is a family-owned heavy civil contractor that delivers highway, transit, site development, and environmental construction services across the Pacific Northwest. The company provides four integrated service capabilities—underground utilities, stream and wetland mitigation, grading and retaining walls, and culverts and buried structures—executed with an in-house fleet of heavy construction equipment (excavators, dozers, haul trucks, cranes) and a multi-decade workforce.

Product overview

KLB Construction is a family-owned heavy-highway civil contractor serving the Pacific Northwest since 1984. The company operates as a single unified service offering—heavy civil construction and transportation construction—with four core service capabilities that work together on complex projects: Underground Utilities (storm, sewer, water, and conduit installation), Stream & Wetland Mitigation (habitat restoration), Grading & Retaining Walls (earthwork and structural walls), and Culverts & Buried Structures (animal/vehicle/water crossings). Projects span highway and expressway construction, transit infrastructure, site development, environmental restoration, and solar project access road construction.

Differentiator

Problem solved

Functional benefit

Products and services

• Heavy Civil Construction Services Core heavy civil construction and transportation services including highway and expressway construction, transit infrastructure, site development, and environmental work delivered across the Pacific Northwest for state, county, and municipal government clients.
• Underground Utilities

Quantifiable outcome

• Experience Modification Rate (EMR) of .49, ranking in Top 8 of performers under the threshold of .60, with a 6-year average EMR of .68
• +2 more outcomes

Named customers2 records

Segments3 records

Ideal customer profiles3 records

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature1 record

Scale indicators4 records

Recent moves4 records

Expansion highlights4 records

Direct peers

• Granite Construction Incorporated: Large publicly-traded heavy civil contractor with significant operations across the western United States including the Pacific Northwest. Directly competes for WSDOT and regional highway projects with comparable service offerings in grading, underground utilities, and transportation infrastructure.
• Kiewit Infrastructure West Co. Subsidiary of Kiewit Corporation, one of North America's largest heavy civil contractors with major Pacific Northwest presence. Competes directly for large highway, transit, and infrastructure projects with deep resources and bonding capacity.
• Guy F. Atkinson Construction: Heavy civil contractor focused on transportation, highway, and infrastructure projects across the western United States. Directly competes with KLB on WSDOT-style mega-projects including highway widening, interchanges, and complex earthwork.
• Flatiron Construction: Heavy civil contractor specializing in transportation infrastructure including highways, bridges, and rail transit across the western U.S. Directly comparable in scope and customer base to KLB's highway and transit work.
• IMCO Construction: Pacific Northwest-based heavy civil contractor specializing in highway, bridge, and infrastructure construction for state DOTs and regional agencies. Closest direct regional competitor to KLB with comparable service mix and customer base.
• Walsh Construction: Heavy civil contractor with major highway, bridge, and transit operations across the western United States. Directly comparable to KLB in scope, customer base (state DOTs), and service mix for transportation infrastructure projects.

Regional players

• Tapani Inc. Pacific Northwest heavy civil and site development contractor serving Washington and Oregon. Comparable in scale and service offerings (grading, utilities, site work) though focused more on private development and site preparation than highway megaprojects.
• Hoffman Construction Company: Pacific Northwest general contractor with significant heavy civil and transportation infrastructure work. Competes with KLB on transit and infrastructure projects in the region though also serves building and industrial markets.

Broad incumbents

• Skanska USA Civil: U.S. civil infrastructure arm of global construction group Skanska, with significant highway, transit, and bridge operations on the West Coast. Competes with KLB on larger transit and highway projects though operates across a much broader portfolio.
• Mortenson Construction: Major U.S. contractor with substantial heavy civil and infrastructure operations including wind/solar energy site work. Overlaps with KLB on renewable-energy access roads and select infrastructure projects, though broader in scope.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks1 record

Key highlights1 record

Customer concentration

• LinkedInlinkedin.com/company/klb-construction-inc
• Instagraminstagram.com/klbinc

Revenue estimate

Valuation estimate

Number of profiles

Profiles15 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about KLB Construction