• Making Buildings Better
    Expert Guidance in Green Certification

After decades of tremendous growth in suburbia, we are now seeing a population shift back towards... Read more
Lately I’ve been thinking a lot about the cyclical nature of trends. Clothing, household goods, and... Read more


  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

Case Study

  • SK Collaborative Affordable Housing in Mechanicsville, GA

    SK Collaborative is providing EarthCraft certification for a set of 66 new single family homes in Mechanicsville, a historic neighborhood that has...

  • SK Collaborative is providing EarthCraft Technical Advisor services for the...

  • This 1920's era building in the Poncey-Highlands neighborhood in Atlanta, once a luxury hotel, has for many years provided affordable housing.  A...

  • SK Collaborative provided certification for this affordable senior housing project under the National Green Building Standard (NGBS).  Developed...