Every Construction Project Starts Below Grade

At Capitol Custom Construction, we provide heavy site preparation and excavation services tailored to the terrain of Western Washington. We prepare stable, structural pads engineered to support custom residential builds, detached ADUs, structural additions, and commercial developments across Thurston, Lewis, Mason, Grays Harbor, and Cowlitz counties.

Advanced Grade Control & Compaction: Our team combines heavy power with advanced grade control to ensure proper compaction, sub-base stability, and critical drainage mitigation from day one.
Builder-Led Digging: Our operators dig with the final architectural structure in mind. We execute precise over-excavation for footings, establish ideal equipment access points, and trench utilities to protect the overall build schedule—saving you thousands in corrective dirt work down the line.
Integrated PNW Drainage Infrastructure: We build site-specific drainage infrastructure during the excavation phase to protect your foundation against heavy rainfall and high groundwater saturation.
Low-Impact Clearing & Erosion Control: We specialize in low-impact site clearing, engineered retaining wall excavation, and erosion control compliance.

The Start of Your Build

We eliminate site delays by anticipating underground obstacles, managing stormwater erosion controls, trenching water/sewer/septic and power corridors, and securing precise final grades before the first concrete pour.

Why Homeowners Partner With Capitol Custom Construction

Professional Contractors: Entrust your next project to contractors who have been in the game for years and have the know-how to execute your dream build.
Licensed and Insured: Our contractors are licensed and insured experts. Our work is done at the highest safety standards.
We Fill Any Need: Our services range from new home construction to general home projects. Whatever your build is, we can do it.
Honest and Trustworthy: No surprise work, fees, or flaky contractors here. We communicate clearly and deliver what we promise.

Cory and Betianne Vaughn, Owners of Capitol Custom Construction

Cory & Betianne Vaughn

Owners, Capitol Custom Construction — Olympia Master Builders

We are upfront, straightforward, and defined by a straight-to-the-point operational methodology. We pride ourselves on clear, insight-driven communication and prompt execution. We do what we say and honor our commitments.

Coastal home decking by Capitol Custom Construction

Coastal Vacation Home Client

Three-Time Return Client — Washington Coast

Capitol Custom Construction built our coastal vacation house decking using WOLF composite boards, a Fortress Aluminum picket handrail system, and all marine-grade stainless steel fasteners engineered for coastal weather.

Powell Barn Custom Build by Capitol Custom Construction

Custom Home & Barn Build Client

South Sound Custom Build — Thurston County, WA

From initial excavation and foundation work through structural framing, custom drywall, bathroom tilework, and exterior roofing and siding, Capitol Custom Construction delivered radical transparency and zero surprises.

Excavation

Every Construction Project Starts Below Grade

The Start of Your Build

Why Homeowners Partner With Capitol Custom Construction

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More of Our Services

Capitol Custom Construction Pushes the Boundaries of What Is Possible in Your Home Build or Renovation.