The online ramblings of Housebuilder's Bible author Mark Brinkley. The paper version is updated every two years and is widely available via UK bookstores and Amazon
That's exactly what I mean. I think it just makes it a lot easier to read the different window types.
I think it now benefit from being flipped so the lowest cost is bottom left and the highest cost top right...
And for bespoke wooden windows? I suspect that you could double the frame costs.