Thursday 22 June 2006 11.38am
Whilst aluminium frames might seem like a good idea they are expensive if you want to avoid cold-bridging which happens with a solid aluminium frame. To avoid this the frame needs to be split (inner face and outer face with an insulator between) and this is expensive.
I'm also surpised that the planners say that you can replace sash frames with aluminium in a Conservation Area. You are being misinformed and maybe you need to check with the conservation section of (I'm presuming) Southwark Council
. Which Conservation Area are you in?
The best option would be to replace the existing frames with hardwood versions. You don't need to use double glazing and double glazed units will make the glazing bars too thick. Single glazing with inner shutters and curtains do as good a job and look more in keeping.