PART O – OVERHEATING 

Part O compliance is required by building control for new build properties. This is to ensure the occupants of the building are protected by reducing the occurrence of high indoor temperatures. We recommend Part O is considered preferably before planning permission is applied for to reduce the risk of amending approved plans, therefore reducing timescales. There are two methodologies that can be applied.

Simplified Method  

Used to limit solar gains and provide a means of removing excess heat. We will look at the following 

  • Location  
  • Building Aspect 
  • Cross Ventilation 
  • Purge ventilation 
  • Shading 

Dynamic Simulation Method 

Provides a standardised approach to predicting overheating risk for residential buildings using dynamic thermal modelling as an alternative to the simplified method.  

Building control will be provided a report demonstrating the residential building passes CIBSE’s TM59 assessment of overheating 

  • CIBSE’s TM59 methodology for predicting overheating risk 
  • Limits on the use of CIBSE’s TM59 methodology  
  • Acceptable strategies for reducing overheating risk 

MAKING IT WORK FOR YOU 

Part O compliance is required by building control for new build properties. This is to ensure the occupants of the building are protected by reducing the occurrence of high indoor temperatures. We recommend Part O is considered preferably before planning permission is applied for to reduce the risk of amending approved plans, therefore reducing timescales. There are two methodologies that can be applied.