About Us

475 Purpose
475 High Performance Building Supply (475) is a catalyst in the transformation of the US construction industry to high-performance, ecological, low-energy building.  475 enables greater occupant comfort and health, and more durable, resilient, and sustainable buildings.  475 enables building energy efficiency improvements required to dramatically reduce our energy demand and address our climate crisis.

The name “475” is a reference to the heat demand requirement of the International Passive House Standard, 4.75 kiloBTUs per square foot per year - representing approximately a 90% reduction in heating energy demand from average building stock.

475 Products
To fulfill our purpose 475 offers, exclusively to the US market, carefully selected products that focus on what matters most in high-performance, ecological, low-energy construction:  airtightness, ventilation, insulation, fully integrated openings, and a predictably calculated energy balance.   Manufactured by leading German companies like Pro Clima, Lunos, Gutex, Lamilux and the Passive House Institute, the products have been proven in the development of the German high-performance market over the past two decades and today are critical components in low-energy building around the world and across the US.

475 Service
475 was founded by architects, for architects, builders, engineers and other professionals.  475 is built on a business-to-business e-commerce platform where the public pricing on the website is the trade pricing, and components can be purchased 24/7.    Our sales people work directly for 475, cutting out intermediate layers and providing direct, knowledge based, sales, support and distribution.    475 is headquartered at 131 Union Street, Brooklyn, New York - and is currently building a nationwide sales force and distribution network to ensure local, knowledge based solutions.

475 service is based on a virtuous circle of knowledge development.  It starts with our fundamental appreciation for building science and the ongoing application of building science to real world needs.   We are constantly collecting information: reading, visiting job sites, conducting tests, speaking with architects, builders and owners.   We are then processing this information to determine what’s working, what isn’t, what’s relevant and what is not - and out of that, produce our synthesis of the information in writings, details and illustrations.  We offer our writing, details and illustrations to our professional audience to use, customize and for them to provide feedback.   This customer feedback forms the basis for further information collecting and the ongoing development of our details, writings, service and support.    This circle of development is a deep collaboration we are committed to with professionals across the US and the globe.  

475 People
475 began in a conversation between Ken Levenson and Floris Keverling Buisman while driving on the Merritt Parkway back to Brooklyn after completing a blower door test on a Passive House retrofit project in Westport Connecticut.   On that drive, Ken, a registered NY architect since 1993, and Floris, a Dutch trained architect and building science consultant, discussed their realization that the US building supply industry didn’t seem to care much about low-energy/high-performance building or about providing the products and knowledge support required for it.  By the time they crossed the Kosciuszko Bridge they had concluded that not only did the US construction market need such knowledge based high-performance materials but that they could do it themselves.   And they are.

475 is growing carefully with employees committed to ecological high-performance building.  Oliver Klein, our first regional sales consultant is also an architect with professional experience in low-energy and Passive House construction.  475’s Creative Director and communications manager, John Druelinger studied sustainability at the City College of New York, and the Director of Operations, Patrick Jaojoco is a recent environmental studies graduate from New York University.

Floris Keverling Buisman Floris Keverling Buisman
CEO / Technical Director, CPHC, LEED AP

Floris has a Master's degree from the Delft University of Technology, School of Architecture, The Netherlands. He built the Lucy House at the Rural Studio, worked at Common Ground Community, and on Mayor Bloomberg’s PlaNYC Green Code Task Force. Floris is a Certified Passive House Consultant, WUFI-ORNL instructor, and a founding board member of New York Passive House. Floris is an adjunct professor at The City College of New York and has been a guest critic at Pratt Institute and Columbia University.
Ken Levenson Ken Levenson
CFO / Sales Director, AIA, CPHD

Ken graduated from Pratt Institute in 1989 and has been a registered architect in New York State since 1993. Ken is a Certified Passive House Designer, a founding board member of the National Passive House Alliance and of New York Passive House. Ken regularly lectures on the Passive House standard.
Oliver Klein Oliver Klein
Regional Sales Consultant for New England, CPHC, LEED AP

Oliver graduated from Dartmouth College in 1993 with a Master of Science and then in 2008 from Boston Architectural College with a Master of Architecture. Oliver is a registered architect in Massachusetts, a Certified Passive House Consultant and a LEED Accredited Professional. Oliver brings to his sales work a deep concern for building science and sustainability.
John Druelinger John Druelinger
Creative Director

John began his career in sustainability planning in 2009 when, inspired by the book Cradle to Cradle: Remaking the Way We Make Things, he became involved in co-authoring the first Climate Action Plan for The Evergreen State College in Washington State. He has since initiated or collaborated on small- and large-scale sustainability plans for public transportion and local government operations in the Pacific Northwest before moving to New York City and catching the Passive House bug. He holds a degree in Sustainability Planning from The Evergreen State College and a Masters in Science degree from The City College of New York's Sustainability in the Urban Environment program where he focused on innovative sustainable building strategies and building energy.
Patrick Jaococo Patrick Jaojoco
Director of Operations

Patrick Jaojoco graduated Cum Laude with a Bachelor of Arts in Environmental Studies and English Literature from New York University, where his studies focused on environmental ethics and sustainable development. Patrick also writes for and manages an environmental art, media, and design blog, the Artvironmentalist.
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