If you tuned into Grand Designs last night to see the building of the smallest two bedroom house in London, you will have seen JML Contracts building the SIPS framework of the house. JML also apply their skills and techniques to garden room design as JML Garden Rooms.
— JML Garden Rooms (@JMLGardenRooms) October 26, 2017
You might want to take a look at some of their garden room projects:
You might then want to talk to the JML team on 01764 663 668 or take a look at their website.