Part O (Overheating)
Part O (Overheating) Calculations
Since June 2021, these calculations are now a requirement for ALL new build dwellings, whether they are in High Risk areas (large cities) or Moderate Risk areas (everywhere else). The calculations check the build has sufficient cross-ventilation and limited overheating due to solar gains.
GDA-Kent provide the Simplified Method of calculations.
General
1. Does Part O apply to extension and conservatories?
Part O only applies to new residential buildings. See paragraph 0.3 of Approved Document O where this is explained further. Conservatories on new residential buildings must meet the requirements of Part O.
Part O does not apply to extensions or conservatories added to residential buildi
1. Does Part O apply to extension and conservatories?
Part O only applies to new residential buildings. See paragraph 0.3 of Approved Document O where this is explained further. Conservatories on new residential buildings must meet the requirements of Part O.
Part O does not apply to extensions or conservatories added to residential buildings after they are built.
Part O does not apply to buildings undergoing a change of use.
Simplified Method
Simplified Method
2. Why do the glazing limits for high risk locations sometimes allow for larger glazing areas than lower risk locations?
The simplified method for buildings in high risk locations includes shading standard, which is factored into the glazing area calculations. This means that glazing areas for west facing buildings in high risk areas ca
2. Why do the glazing limits for high risk locations sometimes allow for larger glazing areas than lower risk locations?
The simplified method for buildings in high risk locations includes shading standard, which is factored into the glazing area calculations. This means that glazing areas for west facing buildings in high risk areas can sometimes be larger than buildings in moderate risk areas. Paragraph 1.6 of the Approved Document states all the standards for limiting solar gains that should be followed. For further information on shading in high risk areas see paragraph 1.9 of Approved Document o. https://www.gov.uk/government/publications/overheating-approved-document-o
Residential buildings or parts of buildings in a moderate risk location can be designed to meet the glazing limits of the high risk location provided they also meet the shading requirements of the high risk location.