About Us

B-Line Construction is a locally owned, family-operated construction company based in Shelton, Washington, proudly serving Mason County and surrounding areas including Belfair, Allyn, Union, and Hoodsport. We specialize in septic system design and installation, including advanced septic systems, along with excavation services, site preparation, tree removal, demolition, and custom home building.

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Founded in 1991, B-Line Construction began as an excavation contractor in Shelton, WA and has grown into a full-service construction company. Today, we provide everything from septic system design and septic installation to complete custom home construction—delivering reliable, start-to-finish solutions for residential and property development projects.

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What sets B-Line Construction apart from other contractors in Mason County is our ability to manage every phase of a project in-house. From excavation and site development to road building, septic system installation, and full home builds, our experienced team ensures quality workmanship at every step.

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For homeowners and property owners, this means working with one trusted contractor throughout the entire process. Whether you need septic pumping, septic system installation, land clearing, or full site prep in Shelton or anywhere in Mason County, we bring decades of hands-on experience and a commitment to doing the job right.

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We take pride in providing dependable service, using high-quality materials, and maintaining strong communication from start to finish. Our goal is to deliver results that last and projects that run smoothly.

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B-Line Construction is fully licensed, bonded, and insured in the State of Washington (License #BLINECI030N7), giving our customers confidence and peace of mind.

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Thank you for taking the time to learn about B-Line Construction. If you’re looking for septic services, excavation, or a trusted contractor in Shelton or Mason County, we look forward to working with you.