HI
We have had planning permission for a single story extension, and now submitted for building reg approval, with one question over the windows.
The whole house is double glazed with very good quality and condition Everest wood and white aluminium double glazed windows.
We would like to reuse the window and patio door in building the extension, as these are perfectly good condition, sealed units, and in our view replacing with the latest all singing and dancing patio door and window will cost £1500+ which I can not see how the latest U values would ever recover this cost V keeping current units.
Also the wasted energy from making new/binning these old ones.
I have put the above to the building inspector and he is asking for U (1.6 W/m2K) values, and if greater than 1.6 and other thermal elements are increased might be OK.
Any advice?
Edit to add they are 28mm units and area is 2m2 for each
Also just been on this web site below and entered details of units, and difference between E and A of 20 years is only £200.
http://www.ggf.org.uk/energy-savings-calculator
We have had planning permission for a single story extension, and now submitted for building reg approval, with one question over the windows.
The whole house is double glazed with very good quality and condition Everest wood and white aluminium double glazed windows.
We would like to reuse the window and patio door in building the extension, as these are perfectly good condition, sealed units, and in our view replacing with the latest all singing and dancing patio door and window will cost £1500+ which I can not see how the latest U values would ever recover this cost V keeping current units.
Also the wasted energy from making new/binning these old ones.
I have put the above to the building inspector and he is asking for U (1.6 W/m2K) values, and if greater than 1.6 and other thermal elements are increased might be OK.
Any advice?
Edit to add they are 28mm units and area is 2m2 for each
Also just been on this web site below and entered details of units, and difference between E and A of 20 years is only £200.
http://www.ggf.org.uk/energy-savings-calculator