I am having a garden room down the bottom of the garden, plenty of excitement leading up to start day (today) and I now have one massive worry, the room faces the house so no boundary there obviously but on the other 3 sides there is 600mm all the way round I chose a room that had a "planning friendly height" 2.5mtr as it is close to the boundary and so doesn't require planning, however they have started the build today, floor in, walls on, sips roof on, and I have been out and measured at the front and it is 2600mm from the slabs on the ground at the front and 2400 from the slabs on the ground at the back, the way I see it when they come back in the morning they need telling to pack up tools or reduce the height to 2.5 max all round, to be fair the ground around it is not level, but surely 2.5 max is 2.5 max ? any help advice guidance anything at all is of great help at the moment.