With dedication to craft, people, and place, Threshold Building Co. offers the highest quality finish work, timber frames, and high performance building to the community of Western Massachusetts and beyond. We lead a committed client, a forward-thinking design team, talented builders, and excellent subcontractors to complete projects with integrity and beauty. These projects combine form and function for the way people live today, and provide durability for the future. Threshold’s mission is to provide Western Massachusetts with comprehensive building services focusing on quality craftsmanship, sustainable building practices and clear customer communication.

We specialize in designing and building natural, soulful, resilient and energy efficient homes, timber frames, tree forms, scribe work, Vermont materials, net zero homes, timber framed solar pavilions, barns & outdoor structures, spiral stairs & compound roofs.

Mr. MacLean is an architect, educator and licensed builder who began his career as a project manager with a number of large architectural firms in Boston before he started his own firm, Timeless Architecture in 1988. He has been promoting and teaching Green Design for 35 years, starting with the Boston Society for Architecture where he served as co-chair of the Committee on the Environment (COTE), a sub-committee that promotes sustainable design in the New England Region. He has taught and developed ongoing curricula at the Boston Architectural College, Sustainable Design Institute and Master’s program, as well as Wentworth Institute of Technology.

Treehouse Design was founded in 1990 to provide architectural and construction management services for the needs of the vibrant, historically-rich coastal communities of Cape Ann. Currently, our company employs 20 individuals with a broad range of skills and experience, from architects and interior designers to construction managers and cabinet makers. Our office and workshop is located in Rockport, MA, where we take on a broad range of projects, from individual furniture commissions to multi-unit housing developments. Our primary focus, however, is single-family residential design and construction.

We are a small architecture firm specializing in sustainable, energy-efficient design. We believe that high quality design and green building go hand-in-hand, and that higher performance does not necessarily mean higher costs. We work on a variety of project types - new single family homes, mill building renovations, new multi-family, and commercial buildings - and we particularly enjoy urban infill and re-purposing old buildings.