I've replaced 2 windows with double glazing at about£750 a piece. Only 12 to go so I'd be interested in what you find out. My builder was honest and pretty good. If you want his number I'd be happy to whisper it to you.
I wonder if you could whisper me that number. I feel like I live on the hard shoulder of a motorway at the moment. £750 seems very cheap, was that for a sash window?
Comments