Brilliant experience, go to Garden Affairs if you're thinking of a garden building of any sort. Lovely company and very helpful friendly staff and installers who took us through the whole process from first discussion to design and installation. The new office is amazing and has transformed my work from a cramped desk in a bedroom to having a comfortable 10 x 15 foot room in the garden. Surprisingly reasonable cost too, about one quarter of the cost of the loft conversion we considered. Thanks. :-)