We offer a broad range of energy modelling and dynamic simulation services to aid in building and building systems design to optimise non-renewable energy use. Computer simulations enable us to set up models at various levels of abstraction during the project development and continuously optimise the different components of the building. In this way, heat gain is minimised and passive techniques such as daylighting and natural ventilation are favoured as an effective means of reducing energy consumption. We have extensive knowledge and experience of computer simulations in various areas of sustainable engineering. These simulations can be broadly grouped into building energy modelling and dynamic simulations. Dynamic simulation software allow us to carry out advanced control schemes, make decisions on natural ventilation using windows and roof vents for stack effect, assess heat gains and quantify fenestration for optimal daylighting.