Energy loss is covered in a number of areas within the building regulations, and applies directly to the installation of new windows. As a result, any new project that requires the installation of windows, doors and roof-lights has to abide by the regulations, and this is the case with both domestic and non domestic properties.
Here, we’re going to take a look at the impact the regulations have on windows, rooflights and skylights.
What are the regulations the windows need to comply with?
These are the current standards for any new build:
For rooflights, U-values are the most important area to focus on.
Are there any exceptions to the Part B Building Regulations?
In some cases, replacement windows may be unable to obtain the above U-values due to the need to maintain the external appearance of the building’s character - in a listed building, for example.
In these cases, replacement windows will be required to be a centre pane U-value of 1.2 W/m2K. Single glazing, meanwhile, should be supplemented with ‘Low E’ secondary glazing.
(It’s also worth noting that standard double glazed units with low emissivity coating do NOT meet the current values, and a Building Control Surveyor will not sign a Completion Certificate off without proof from the window supplier that the U-values have been met).
U values are probably the most important factor when it comes to rooflights, and need to be taken very seriously.
Verifying compliance regarding the installer
Whenever a property is bought or sold, the surveyors will ask for proof that any glazing installed after April 2002 is compliant with the building regulations. There are two ways of demonstrating this:
Any project carried out by a non registered firm - such as a DIY project - will need to be verified by the local council (though this shouldn’t be relevant to architects).
Should Building Regulation approval by the local council be required, payments will need to be made as follows:
In addition to the U values and thermal performance, there are a number of other areas the building regulations cover with regards to windows:
At Sunsquare, we accurately calculate the U-value of each of our BSI Kitemarked rooflights, designing and manufacturing skylights that are easily compliant with Building Regulations due to their impressive thermal performance. Even our fully-insulated upstands provide U-values of just 0.58: not only ensuring your Sunsquare skylight fits perfectly, but ensuring zero per cent chance of dew and damage to the roof membrane. What’s more, we can provide thermal performance certificates for our rooflights.