So disappointing! Not Certass or Fensa certified! First installation had hardly any screw fixings just inches of foam to hide poorly measured windows. Second installation is more secure but two weeks after paying the bill it rained and now they leak every time and let heat out constantly. After four months they hadn't even sealed the window cills. Then I discovered that they're not Certass or Fensa certified and can't provide a Building Regulations certificate as I was told they could. After refusing to refund me I'm left with over £18k of windows that don't comply with Bulding Regulations.
April 2023.