I now have 4 different quotes for windows. And they all give different information. It is extremely hard to know if you are comparing apples with apples or apples with pears. So I decided it was time for a spreadsheet! I listed the window companies: Kloeber, Eximia, Green Building Store and Vindor and their quotation prices. I compared them across various areas: airtightness, U-value, water tightness, acoustic rating, security rating. I had this information for some but not others so I could decide if I wanted to go back and ask this. Some quotes allowed for 2 different colours internally and externally. Initially we asked for alu-clad but this is about 20% more expensive than timber so we had to revise our expectations. It turned out one of the quotes didn't even include cills and was a similar price so we ruled that one out. All quotes initially were for supply only. But after consideration, we realised that fitting a first floor window that weighed 650kg wasn't a simple tas...