No, building control approval isn’t required for garden rooms up to 15m2 as long as they do not contain any sleeping accommodation (habitable dwelling). The same rule applies for garden rooms that are between 15 – 30m2 but will need to be either at 1m from all boundaries or constructed using substantially non-combustible materials if built within 1m from the boundaries.
Upon request and for an additional cost, we can include fire rated materials in the construction process, providing you with a substantially non-combustible structure, which in turn, will allow you to position your garden room less than 1m from your boundaries, saving you valuable space within your garden.