I'm putting a gym and art / craft rooms in the garden for the kids to mess around without making a mess in the house. Typical garden rooms seen on architecture sites have patio doors, French doors or bifold doors in order to connect with the garden, and have a canopy over like these, then a patio outside.
Why would a garden room in the UK have a canopy? And when would it be better to build one with, or without a canopy?