Part O of the Building Regulations addresses overheating in new residential buildings. This regulation aims to limit unwanted solar gains and provide adequate means for removing excess heat from indoor environments.

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To demonstrate compliance with Part O, designers can choose between two calculation methods:

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1. The Simplified Method
2. Dynamic Thermal Modelling (TM59)

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The Simplified Method provides a straightforward approach for assessing overheating risk based on factors such as glazing area, orientation, and location. It offers prescriptive guidelines for limiting solar gains and removing excess heat.

 

For more complex projects or when greater design flexibility is needed, the Dynamic Thermal Modelling method can be employed. This approach uses CIBSE TM59 methodology to conduct a detailed overheating assessment. TM59 is a standardised procedure for evaluating overheating risk in homes, considering factors like occupancy patterns, internal heat gains, and ventilation strategies.

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Both simplified and dynamic models take into account:

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1. The building's location (moderate or high-risk areas)
2. Cross-ventilation possibilities
3. Glazing area and orientation
4. Shading options
5. Means of removing excess heat

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By using Home+ Energy, designers can ensure their projects comply with Part O requirements, creating more comfortable and healthier living environments for occupants.