Building services engineering involves maintaining a functional environment in buildings, so that the users of the buildings are comfortable. This may involve monitoring heating, security, power supply, and air conditioning.

Building Services Engineering cover a wide range of different activities, which include designing, installing, commissioning and maintaining systems for heating, lighting, refrigeration, acoustics, air conditioning, ventilation, water and plumbing, energy, power and renewables, lifts, controls, and fire and security.