Nicholas Mitchell
Hi Jan, it's quite straight forward to fit a cat flap to a sealed unit. Allow 1 x week for works though most of the time is spent waiting for the glass to be prepared. If the glass needs cutting to a specific profile be prepared for a significant cost as these glass cuts can be £70+for each side. If The cat flap only requires a diameter hole cutting it's a lot cheaper. You will need the hole cutting big enough to accept the fixings as well. If you cut a large hole in glass with smaller holes for the fixing's nearby, even though the glass will be eventually toughened it will actually be weaker than expected. Hope that helps Nick
