MEP engineers must design engineered building systems based on several codes and standards

Codes and standards insights
- Codes, standards and guidelines must be followed when retrofitting existing or designing new buildings.
- The primary code bodies that consulting engineers are concerned with are NFPA and ASHRAE.
Mechanical, electrical, plumbing, fire protection, lighting and other commercial building system design is dictated by a variety of codes and standards. They define the minimum requirements for the design of new buildings or the retrofit of existing buildings.
These codes and standards are updated on a regular cycle, typically every three years. They are then adopted by the local authority having jurisdiction on a timeline that suits the state, city or region. Engineers must adhere to the code, and ensure the design meets the minimum requirements.
Two key code-creating bodies are the National Fire Protection Association and the American Society of Heating, Refrigerating and Air Conditioning Engineers. NFPA produces codes and standards on topics mostly related to fire, life safety and electrical/power systems. ASHRAE produces codes and standards on heating, ventilation, air conditioning and refrigeration topics.
There are a variety of specialized standards, including those from Facility Guidelines Institute, the RESET Standard and others. In addition, the International Code Council releases several codes related to energy efficiency, fire protection and plumbing systems, to name a few.
Standards bodies, government institutions and associations manage them.