Part O Calculations,

aka Approved Document O Studies/Reports/Calculations

Approved Document O was born out of a need to address the overheating of dwellings due to the ever-increasing requirement for airtight, well insulated buildings to comply with Part L. The changing climate is also a factor in the overheating experienced in new buildings.

To satisfy Part O a dwelling should be modelled to show that there is no overheating issue, or to show that mitigation measures on the building address the potential for overheating. Mitigation measures could be simple shading from overhangs or from louvres fitted to some windows.

What is Part O overheating modelling?

There are 2 types of Overheating modelling that can be used to satisfy Part O:

The Simplified method
This is a rudimentary calculator that can be used for simple buildings that have no large areas of glazing facing in a Southerly or Westerly orientation.

The Dynamic Thermal Modelling method
This is a more complicated method that dynamically models the building, taking into account location, solar radiation, ventilation, building fabric & shading, amongst others.

Contact us to find out how we can help you comply.

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