Hi,
I am just about to complete on a house that needs complete renovation including replacing all the windows.
My question is: how do you pick a double glazing company?
I have read on here that it’s better to go for a local company, but how do you choose? I bought my current flat from new, and no one I know has ever had to buy double glazing. 
It’s such a lot of money, I don’t know where to start?
Any help would be appreciated TIA