Do not bother with a fensa registered fitting company as fensa is a absolute joke, My windows are less than 2 years old and there is a problem with condensation between the glazing because they were fitted for the person I bought the property off the guarantee is void! So in other words they do not guarantee the workmanship at all. In my eyes this is not good practice.
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FENSA provides all the proof you need that replacement window & door installations meet Building Regulations and are registered with Local Council.
