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Sustainability Treehouse Media ©Photograph by Joe Fletcher © Photograph by Joe Fletcher

Sustainability Treehouse


The Sustainability Treehouse, a Living Building Challenge targeted interpretive and gathering facility situated in the forest at the Summit Bechtel Reserve, serves as a unique icon of camp adventure, environmental stewardship and innovative building design. Mithun led the integrated design process and a multidisciplinary team to achieve the engaging, high-performance facility.

The Treehouse provides dynamic educational and gathering spaces for exploring and understanding the site and ecosystem at the levels of ground, tree canopy, and sky. The towering Corten steel frame elevates visitors to extraordinary vantages and provides an armature for green building systems, such as photovoltaic panels, wind turbines, and a large cistern and water cleansing system. Interactive exhibits showcase and celebrate sustainable technologies. Overall, the Treehouse captures the wonder of childhood exploration and places environmental education at the forefront of meaningful experiences and camp messages for thousands of annual visitors to take home.

Design Architect: Mithun
Executive Architect/Architect of Record: BNIM
Exhibit Design: Volume, Inc./Studio Terpeluk



  • AIA Committee on the Environment (COTE), Top Ten Green Project Awards
  • CORE77, Design Awards: Interior & Exhibitions, Professional Award
  • SEGD, Exhibition Awards: Honor Award


  • AIA Seattle, Honor Awards: Built Award


MSN Innovation: New treehouse design offers eco-friendly living

EcoBuilding Pulse: Sustainability Treehouse

Dwell: A Sustainable Educational Center for the Boy Scouts of America

ArchDaily: The Sustainability Treehouse / Mithun

Seattle Daily Journal of Commerce*: Mithun’s treehouse teaches by example

Inhabitat: Wild, Adventurous Treehouse Teaches Boy Scouts About Sustainability

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  • Client: Boy Scouts of America / Trinity Works
  • Start: 2011
  • Completion: 2013
  • Size: 10,000-acre reserve; 5,805 sf structure; stands 125 feet high
  • Certifications: Living Building Challenge targeted
  • Location: Summit Bechtel Reserve, Mount Hope, West Virginia