Seattle Commercial General Contractor and Design-Build
Terrapin Construction Group is Seattle's integrated design-build general contractor, delivering commercial construction across Puget Sound, the Pacific Northwest, and 38 states with in-house architecture, engineering, preconstruction, and self-performing specialty trades.
Seattle Construction Cost Estimator
Describe your Puget Sound project and get a preliminary cost estimate powered by TCG.ai, free, instant, and calibrated to Washington State market pricing.
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Include building type, size, location in Puget Sound, special requirements, and timeline. Our AI applies Seattle prevailing wage, seismic, and permitting factors automatically.
Analyzing Your Seattle Project
Our AI is evaluating construction costs using Puget Sound market data.
Your Seattle Construction Cost Estimate
Seattle's Integrated Design-Build General Contractor
Terrapin Construction Group serves the Puget Sound region from 1700 Westlake Ave N #200, Seattle, WA 98109 as an integrated commercial general contractor operating across 38 states. We bring national-scale resources to every project in the Pacific Northwest, from South Lake Union and Capitol Hill to Ballard, Georgetown, SoDo, Bellevue, Redmond, Kirkland, Tacoma, Everett, and the entire I-5 and I-405 corridor.
What makes TCG different is our fully integrated model. We do not just manage subcontractors. We provide in-house architectural design, structural engineering, MEP engineering, preconstruction, and construction management under one design-build contract. We self-perform critical scopes including IMP installation, PEMB erection, commercial roofing, commercial flooring, and equipment procurement.
Our team understands local permitting through the City of Seattle Department of Construction and Inspections (SDCI), King County, Pierce County, Snohomish County, and the Eastside municipalities. We know the Puget Sound subcontractor market, which has a strong union and prevailing wage presence and is heavily influenced by tech-sector construction demand from Amazon, Microsoft, Google, and Meta, and the specific challenges of building in Washington: Cascadia Subduction Zone seismic requirements (Seismic Design Category D), the Pacific Northwest's persistent rain and moisture management demands, Seattle's notoriously long permitting timelines (8 to 20 weeks), and the Eastern Washington data center corridor (Quincy and Moses Lake) powered by cheap Columbia River hydroelectric.
Explore TCG's Seattle Specialty Pages
Each of these sector pages covers Seattle-specific cost, code, and delivery, with its own AI cost estimator.
TCG Construction Services in Seattle
Every service TCG offers is available across Puget Sound and throughout Washington State, and they work together under one contract.
IMP Installation, Commercial Roofing, PEMB, and Flooring in Seattle
TCG self-performs several critical scopes in the Seattle market that most general contractors subcontract out, giving us direct control over cost, quality, and schedule on the trades that matter most.
Insulated Metal Panel (IMP) Installation: TCG has installed over 1,000,000 SF of IMP across 38 states. The Pacific Northwest's persistent moisture makes IMP's vapor-tight, continuous-insulation envelope especially valuable for cold storage, data centers, manufacturing, and cleanroom and lab environments. Use our IMP cost estimator for Seattle pricing.
Commercial Roofing: Seattle's persistent rain (152 rainy days per year), marine climate, and moss growth demand superior waterproofing and drainage on every commercial roof. TCG provides TPO, EPDM, modified bitumen, standing seam metal, and built-up roofing across Puget Sound.
Pre-Engineered Metal Buildings (PEMB): PEMBs are the most cost-effective structural system for Puget Sound warehouses, distribution centers, manufacturing, and self storage. TCG self-performs PEMB erection and coordinates directly with our IMP crews. PEMBs in Washington require enhanced seismic connections (SDC D) and corrosion protection for the marine climate.
Commercial Flooring: TCG self-performs commercial flooring across Puget Sound, including polished concrete, epoxy and resinous coatings, VCT, LVT, carpet tile, and specialty systems. The marine climate makes moisture vapor testing and substrate prep especially critical for biotech, warehouse, restaurant, and healthcare floors.
What We Build in Seattle and Washington
TCG builds across every commercial sector in Puget Sound and throughout Washington State. Each expertise page includes a sector-specific AI cost estimator.
How Much Does Commercial Construction Cost in Seattle?
Seattle carries a regional cost multiplier of roughly 1.12 to 1.28x the national average, driven by prevailing wage requirements, a strong union presence, seismic design (SDC D adds 5 to 15% to structural), tech-sector labor competition, and long permitting timelines. Seattle is one of the most expensive construction markets outside New York and San Francisco, comparable to Boston and Washington DC. No state income tax partially offsets the high construction costs.
Seattle construction costs by type: Warehouses $100-$200/SF. Offices $180-$430/SF. Restaurants $230-$480/SF. Medical $240-$580/SF. Veterinary clinics $240-$580/SF. Self storage $32-$140/NRSF. Tenant improvements $40-$580/SF by use. Data centers $360-$1,500/SF. Manufacturing $120-$580/SF. Cold storage $150-$360/SF.
Key Seattle cost factors include Cascadia Subduction Zone seismic requirements, prevailing wage and union labor, persistent moisture (advanced waterproofing and vapor management), tech-sector labor competition, and City of Seattle SDCI permitting (8 to 20 weeks). Use our AI estimator above, or schedule a meeting with our preconstruction team.
Seattle Commercial Construction FAQ
Common questions about building in the Puget Sound region. Visit our full FAQ page for more.
Seattle commercial construction ranges from $100-$200/SF for warehouses to $360-$1,500/SF for data centers. The regional multiplier is 1.12-1.28x the national average, driven by prevailing wage, seismic design, and tech-sector labor competition. Use our AI estimator on this page to price your specific project.
Yes. TCG serves the Puget Sound region from 1700 Westlake Ave N #200, Seattle, WA 98109. Our headquarters is in Denver, CO with additional offices nationwide across 38 states.
TCG builds all commercial types in Puget Sound including warehouses, cold storage, restaurants and hotels, healthcare and medical office, cannabis facilities, manufacturing, biotech labs, veterinary clinics, self storage, urgent care, grocery and retail, data centers, tenant improvements, and adaptive reuse.
Washington State requires prevailing wages on all public works, and Seattle has its own labor standards. The Puget Sound region has a strong union presence, and Washington prevailing wage rates are among the highest in the country.
Seattle sits in Seismic Design Category D due to the Cascadia Subduction Zone and shallow crustal faults. Enhanced seismic design, including moment frames, braced frames, and special detailing, adds 5 to 15% to structural cost versus non-seismic markets.
Tenant improvements run 2 to 6 months, restaurants 4 to 8 months, offices 8 to 16 months, warehouses 6 to 12 months, medical 10 to 20 months, and manufacturing 12 to 24 months. City of Seattle SDCI permitting adds 8 to 20 weeks. Design-build compresses timelines by 15 to 30%.
Yes. TCG self-performs IMP installation with over 1,000,000 SF installed across 38 states. The Pacific Northwest's persistent moisture makes IMP's vapor-tight, continuous-insulation envelope especially valuable for cold storage, data centers, manufacturing, and cleanrooms.
Yes. Seattle is a global tech capital home to Amazon, Microsoft, Google, and Meta. Eastern Washington around Quincy and Moses Lake is one of the largest data center markets in the world, powered by cheap Columbia River hydroelectric. TCG provides design-build data center construction with critical power, precision cooling, and IMP envelope systems.
Yes. TCG provides commercial roofing across Puget Sound including TPO, EPDM, modified bitumen, standing seam metal, and built-up roofing. Seattle's persistent rain, marine climate, and moss growth demand superior waterproofing and drainage on every roof.
All of Puget Sound including Downtown Seattle, South Lake Union, Capitol Hill, Ballard, Fremont, Queen Anne, Georgetown, and SoDo, plus Bellevue, Redmond, Kirkland, Bothell, Lynnwood, Everett, Tacoma, Kent, Renton, Auburn, Issaquah, and throughout Washington including Spokane, Vancouver, and Bellingham.
Let's Build in Seattle
From South Lake Union to Tacoma, from restaurants to data centers, TCG is Puget Sound's integrated design-build general contractor. Let's talk about your project.
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