Alex and I discuss the flooring we install in 90% of all the QC garden studios in this video.
(Please note that heavy use of office chairs with castors will eventually damage this flooring - especially if you don't follow the recommended daily cleaning and vacuuming. Dirt and grit acts like sandpaper grinding away at your nice new floor.)
The other 10% of customers upgrade to Aquastep flooring which is more robust and importantly for garden annexe installations - waterproof. Alex and I discuss a granny annexe with the Aquastep in this video...
A protective mat may help reduce the wear from office chair castors.