What is it actually made from?

We build with structural insulated panels, which give you a stronger, warmer shell than a stick-built timber frame of the same thickness. Externally, you can have a wooden finish such as western red cedar, which weathers to a soft silver, or a low-maintenance composite cladding if you would rather not treat anything. Composite garden rooms cost a little more up front and give the time back in weekends you do not spend with a brush.