I thought it would be great to have a purpose built garden room and shed and choose National as were a large company. From the start things were not good. Thy sent the wrong plans a phone call and promise of new plans - never happened. I was told I would need a brick base and double checked with the company that that was correct was told ‘yes’ so we had one laid. Despite my concerns the said building arrived with no glazing as requested, they did send a glazier who told me the window frames were made for double glazed units so he had to bodge them to fit the glass. Worse than that our brick base had to be removed as the shed/garden room was made to sit on a wooden base. The base of the building now has an ugly unfinished look that I’m not happy with. After many e-mails it became clear to me that they were not interested if I had my wits about me I should have told them too add another layer of slatted wood to cover the black damp proof material. I might have just been unfortunate but would I recommend them - No