Associated with the philosophy of Total Building Commissioning are the practices of Retro-Commissioning (Retro-Cx) and Re-Commissioning (Re-Cx). In both practices, we initially focus on reviewing the building’s operations and maintenance (O&M) procedures. Further activities may include reviewing design performance goals, inspecting field equipment and controls, generating computer models of system performance, and conducting thermographic investigations of building envelopes. These investigations serve to identify changes needed to ameliorate non-performing or under-performing building features and systems. 

Often, adjustments made at little to no capital cost can enhance overall building performance. Additional energy conservation measures can be identified, requiring further life cycle analysis to establish the benefit and payback for such measures. 

Retro-Cx and Re-Cx processes require a clear definition of goals and performance expectations. These typically include the following: improving system operation and efficiency, reducing energy consumption and costs, improving O&M training and documentation for staff, and improving occupant comfort and productivity. While different commissioning authorities may use various approaches and focus on a variety of building systems (depending upon the type, age, and usage of the building), most acknowledge that a rigorous methodology of planning, investigation and execution is required to achieve success. 

Re-Commissioning practices are allied with Post Occupancy Evaluations (POEs).


Howard University Hospital

Re-Commissioning + Condition

Assessment + Controls Design 

Washington, DC

GSA: Veterans Administration Building

Energy Conservation + Energy Audit

+ Building Automation Controls

Washington, DC

GSA: Federal Acquisition Services

Workplace Realignment &

Sustainable Renovation Project

Construction Management

+ Retro-Commissioning

New York, NY