Building service system are the systems installed in buildings to make them comfortable, functional, efficient and safe. They can include fire safety, HVAC (heating, ventilation and air conditioning), lighting, plumbing, ICT (information and communications technology).

Building service system play a central role in contributing to the design of a building, not only in terms of overall strategies and standards to be achieved, but also in the position of vertical service risers, routes for the distribution of horizontal services, drainage, energy sources, sustainability.

Building services engineers influence the architecture of a building and play a significant role on the sustainability and energy demand of a building. Within building services engineering, new roles are emerging. Building services engineers play a significant role in combating climate change. As such, a typical building services engineer has a wide-ranging career path in five categories: -

1. Design: designing layouts and requirements for building service system for residential or commercial developments.

2. Construction: supervising the construction of the building service system, commissioning systems and ongoing maintenance.

3. Environmental: developing new energy saving methods for construction, designing new and improved energy conservation building service system.

4. Heating, ventilation and air conditioning (HVAC): specializing in the design, development, construction and operation of HVAC systems.

5. Electrical technology: specializing in the design and development of electrical systems required for safe and energy sustaining operation of buildings and ensures that they are not using low quality materials for the safety of a project.