When did Fensa start? Fensa was first initiated on 1st April 2002 by the government. That's why, as of 1st April 2002, you need a Fensa certificate or Building Regulation Completion Certificate if 50% or more of the window is made from glass panels.

Is it illegal not to have a Fensa certificate?

Why do you need a FENSA Certificate? ... Windows that have been replaced since 1st April 2002 must be supported by a FENSA certificate or a building regulations certificate, to show that they legally comply. It is illegal to have installed double glazing in a property without a building regs certificate.

Can I fit windows without Fensa?

Anyone can fit windows, you don't need to be Fensa registered, although that is what alot of people are led to believe. Being Fensa registerd simply means you can self certify your own work, if you aren't registered you have to get the building officer to inspect and certify the work.