If you’re thinking of buying sliding doors for your extension, choose carefully.
We spent £12600 on 2 sliding doors and a casement window from Express Bi-folds. Couldn’t supply the actual doors we ordered as there were problems with manufacturing quality so compromised on another model, only to find these allow water into the house! They say this is expected. See photo.
The casement window had defective glass! Many revisits were required through faults and incompetence. We paid for all their vans over this period. They offered us a pathetic 2.6% compensation. Beware.