photo of Scott doing Retro_CommissioningSustainable Investment Group’s (SIG) in-house technical services team streamlines the engineering work for sustainable design, construction, and operations of green buildings. In union with our consulting team, SIG is committed to integrative solutions to project management. Our professional engineers prepare thoughtful recommendations and reports to meet your sustainability goals for budget and resource efficiency.

Energy Modeling

At the design phase, we join the team by building an energy model to estimate energy costs. It’s the perfect time to start optimizing the building envelope and mechanical systems with green design features. In this discovery stage, computer modeling helps compare first costs to life-cycle costs, and we make the best recommendation for your triple bottom line. Finally, we take the technical summaries and complete the LEED documentation in collaboration with our consulting team overseeing the comprehensive application. Learn more about SIG’s Energy Modeling services, here.


While a project is under construction, our commission team is already hard at work. SIG’s approach for the best value for commissioning is to integrate the Cx process into the entire project schedule. From document review to operator training, our engineers are on-site trouble shooting anticipated problems. Learn more about SIG’s Commissioning (Cx) services, here.


The ENERGY STAR ™ rating system is an EPA sponsored program that provides a score for how buildings across the country compare to similar properties. Sustainable Investment Group (SIG) has years of hands-on experience with the ENERGY STAR program, and our volume of work has earned us the selective title of ENERGY STAR Partner of the Year – Sustained Excellence for 3 consecutive years. In 2019, SIG certified over 310 unique buildings for our clients all over the nation. Learn more about SIG’s ENERGY STAR services, here.


Does your existing building need a major tune-up? SIG’s retro-commissioning (RCx) services offer the deepest dive into uncovering areas for improvement, optimization, and investment. RCx is where our engineering team really shines. For a 50-story building client in New York City, we uncovered over half a million dollars’ worth of operating savings through the RCx process. We get these results because we know where to look and what actions deliver results. Our engineers have audited and certified over 50 million square feet of building space and our pricing remains fair and competitive. Don’t let those precious dollars slip away in unseen waste. Audit today and save tomorrow. Learn more about SIG’s Retro-Commissioning (RCx) services, here.

If you would like to speak with someone and learn more about SIG’s engineering services, please contact Asa Posner at or 612-567-2019.

For more information about our services, or if you would like to schedule a LEED Exam Prep Class, please contact Asa Posner

Sustainable Investment Group (SIG) Atlanta Headquarters 1155 Mt Vernon Highway NE Suite 800 Atlanta, GA 30338


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