“This extension is stand-alone in that it is not connected to your dwelling although it is under the same occupancy as it is not separately street numbered. To gain access to your main dwelling you need to leave this unit into the outside air and then access your main dwelling area … this is technically an extension of the floor area of your dwelling with its own kitchen, sitting area, bedrooms, bathroom and utility room but is not attached to your main house … the initial plans for this did indicate that this was to be attached to your dwelling but this changed early on in the build”