Hi Leo
THe Builder is saying that it is best to have the Window Supplier install the Sills rather then the External Insulation Supplier,this will cost 8-10k more to do then uPVC (our preference) to to in Aluclad and Alu-Sills.
When I asked about getting triple glazing instead of double glazing the difference was only 8% extra which I thought was pretty good. We went with Rationel and found them very good.
That's similar across all window materials. For a similar profile, uPVC windows are usually best in terms of energy efficiency.
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