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Tadashi Shiga

Sustainability Business Development Consultant

Tadashi Shiga has served as a trusted advisor to developers, third-party brokers, architects, contractors and other industry experts for over three decades. A skilled land acquisition and development consultant, Shiga navigates the market with a methodical outlook to determine long-term trajectories, leverages a Building Science background to analyze potential projects, and utilizes a strong network of connections to well-established development contacts.

Mr. Shiga founded Evergreen Certified, a leading developer consultancy and certifying agency for sustainable construction practices including Built Green, NW Energy Star, Seattle SDCI Priority Green, Passive House, blower door, and duct testing, and other services. In 2023, Evergreen Certified merged with BEE Engineers, resulting in one of the nation’s only consulting firms to offer the full suite of in-house building envelope, energy and sustainability design, and field verification/certification support services for architects and developers.


  • University of Washington; Economics, Political Science, Japanese

Registrations, Affiliations & Expertise

  • University of Washington, Bothel IAS; Advisory Board Member

  • Master Builder's Association, Green Hammer Award for Private Advocate

  • Master Builder's Association, Green Hammer Award for Pioneer

  • HERS Rater

  • Energy Star Verifier

  • PHIUS Rater

Tadashi Shiga
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