Hi Anna, If you are still looking for bi-folding doors, just to let you know that you can get a quote online for supply only doors at www.cantifixdirect.co.uk Our doors are the Shuco systems mentioned by Senor Chevalier above, which are top quality and come with a 10 year guarantee. One thing to consider when deciding whether or not to go for the cheap option is heat loss. Some cheaper doors are made with low spec glass, and a less effective thermal break (non heat-conductive section between aluminium). Our doors are made with premium low-energy glass, which means that you will lose as little heat through them as possible, and therefore miminise your heating costs. Our doors are top hung for easy opening, and are available with a flush threshold (as described by Senor Chevalier). We have a showroom in North West London, and can easily arrange visits. There is a lot of information out there, so if you need anything explained in more detail, please feel free to give us a call on 020 8203 9203 and we will be happy to help. Good luck with whatever you decide to go for! Cantifix
