Making Buildings Work As They Were Intended


DEI is a professional engineering firm established in 1991 specializing in building performance verification. Our areas of expertise include: Building Commissioning, Retro-Commissioning, Re-Commissioning, and Energy Use Assessment.


Over the past 26 years DEI has completed numerous commissioning and energy projects nationally as well as internationally. Our professional engineers bring their extensive experience and diverse background to every project we undertake. 

Why DEI?

DEI has built a reputation for quality and proven understanding of building technical issues. We take pride in our ability to communicate concisely, accurately, and effectively with our clients. DEI has a proven record and long history of consistent, high-quality, on-time, and within-cost performance. 

GSA C&A United States Green Building Council Energy Management Association