Check out what our customers are saying!

green|spaces has had the pleasure of working with Abe for years now. His knowledge and expertise has benefitted us; from green building program development and training curriculum to HERS ratings and building science proficiency.

Anj McClain, Director, green|spaces Chattanooga

In their roles as the primary contributors to the LEED v4 Reference Guide for Homes Design and Construction, Abe and Carl were critical in making this document the incredibly valuable tool that it is. Their depth of knowledge of green building and the LEED for Homes program, as well as numerous images from their textbook, Green Building: Principles and Practices in Residential Construction, were instrumental to the success of this project.

Asa Foss, LEED Residential Technical Development Director U.S. Green Building Council

Thank you again for all the work you did to help make our new home more energy efficient and comfortable to live in. I would recommend that anyone building a home discuss with you the advantages of using green building techniques. You gave us a wide range of options to choose from and gave us the opportunity to select the energy efficient building components we felt were most important. More importantly, you helped educate the builder on proper construction techniques, especially when it came to sealing the house, insulation, windows, and properly sizing the HVAC units. Having a... Read More

Dave Matthews

Carl and Abe at SK Collaborative are straight shooters who know what they are doing and do it well. I have intentionally gone out of state to hire SK Collaborative because of their vast experience and passion for sustainable development.

Mark West, Exoterra Architects

I wish we had two full days with Carl because it was very obvious that his knowledge, experience and thought processes would be highly beneficial to our organization. He covered an amazing amount of knowledge in a very short time. We came away with more than a recommendation on how to "green" a house; we came away with a new thought process

Brent Runyon, Thomasville Landmarks

Carl is on the bleeding edge of the sustainable construction movement, and one of the few proponents who understands the special challenges faced by green remodelers. As a former working contractor, Carl works hard to bridge the gap between pure building science and its application in the field, and his hands-on experience gives him a unique perspective on sustainable construction theory and practice. In the writing and speaking Carl has done with my magazines, he has always been a pleasure to work with.

Sal Alfano, Editor, Professional Remodeler Magazine

Carl helped us create and design our dream EarthCraft home. We were drawn to Carl based on our research. His accolades in the "green building" community are extensive, and we knew he was the man for the job. We wanted a healthy, efficient, and comfortable home while keeping an eye on our environmental impact. Because Carl is on the bleeding edge of green building and innovative technology, he was able to help us incorporate many of these techniques into our home. We were afraid that 'green building' would be complicated, lengthen the build time, and cost significantly more. We found that... Read More

Dawn and Keith Reed