Making Buildings Better

SK Collaborative provides consulting, inspections, energy modeling, and verification services for all green building programs.

SK Collaborative works with architects, developers, builders, and owners to make their new and existing buildings more energy efficient, sustainable, and achieve green building certifications. Our services also include building envelope inspections and testing for air and water intrusion, plan reviews, professional training, program development, and technical writing.


States, US territories, and countries we work in


Green building certification programs offered


The year our oldest certified apartment building was built


Total square feet of multi family projects certified


Residential units certified to date


Residential units pursuing third-party testing and verification

See A Map Of Our Work


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.

Sal Alfano, Editor, Professional Remodeler Magazine

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.

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

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.

Brent Runyon, Thomasville Landmarks

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

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.

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
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.
Dawn and Keith Reed