Home Improvement

Know about the building regulations for windows and door replacements

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Replacement of the windows and door over time increases the value of your home. Since April 2002, the replacement glazing comes under within the scope of the building regulation. In this way, you have to comply with the new thermal performance standard. However, the replacement of glass is exempt. It is based on the analysis of safety, means of escape, air supply, and ventilation of the windows. 

This new replacement windows regulation is based on the general guidance associated with the expected performance of the materials and building work. It provides regulations based on the practical solution and example of some of the common building situations associated with the windows and doors. Any external window is classified as a “controlled fitting” according to this building regulation. Any replacement should meet the certain set of standards provided by these new replacement windows regulations.

Building regulation for windows 

Your selected installer should be registered under the FENSA scheme considering the building regulation. Other than that, you must attain the certificate from the local authority confirming that the installation is approved under the building regulation. Here are some of the important aspects regulated in the scheme:

  • Thermal heat loss: Consider the regulation associated with the amount of heat that can pass through the framework and glass. It is measured as U-value, which should not exceed a certain limit. 
  • Safety glazing: Safety glazing should be provided to glass that is in any critical area.  Safety glazing is based on ensuring that injuries could be avoided due to the occupant colliding with the open windows. It is also based on the windows positioning and glass panes marking. 
  • Ventilation: The ventilation regulation is based on a factor such as steam produced in any area. It depends on the size, usage, and type of the room. For example, a room with more steam production should be provided with a high level of ventilation. 
  • Means of escape: According to the new replacement windows regulations, the opening should be sized to provide the potential to escape. The mean of escape for the newly installed window should be based on an extension or existing dwelling.
  • Unprotected areas: According to the new replacement windows regulations, external windows need to have fire resistance and self-closing to reduce the fire spreading risk between the adjacent properties.
  • Fire safety: Fire safety regulation is based on two factors, which include the mean of escape in case of fire and the fire that could spread through unprotected areas. 

Measuring windows replacement guide 

Here is measuring windows replacement guide based on the general criteria for the egress windows:

  • The width and height should not be any less than 450mm.
  • They presence of the clear openable area is crucial with no less than 0.33m².
  • The cill height which is the bottom of the openable area should not be more than 100mm above the floor. 
  • Only one window per room is generally required. 


The measuring windows replacement guide should be considered for improving the safety and security of your residential property. Make sure you consider the FENSA scheme to increase your property value. Through this scheme, the local authorities and window installer meets the safety standards and precautionary measures essential for the protection of properties.