Comprehensive Services, Challenging Projects Your Full-Service Engineering Partner Founded in 1973, Grumman|Butkus Associates is a nationally recognized firm specializing in sustainable design engineering and energy efficiency consulting. Our award-winning services include facility assessment and analysis, MEP engineering design, commissioning, retro-commissioning, monitoring-based commissioning, and energy efficiency and LEED consulting. We help clients achieve goals and solve tough problems, with particular expertise in energy-intensive and complex facilities, including: