I really want these 'concertina windows'!!

[fancyacoffee]

www.houzz.co.uk/photos/248238/wilsondale-project-country-kitchen-boston

These are so great and would be perfect for my extension. Does anyone know where I could get them from? Thanks!

They're bi-fold windows but use a smaller frame size than usual. I'm sure that anyone who makes bi-folds could knock some up to your specifications - don't go for black hinges though, I thought they really spoiled them.