Double-storey extension: rules, council figures and cost
A rear extension of more than one storey is only permitted development if it stays at least 7 metres from the boundary opposite the rear wall and no part rises above the highest part of the existing roof, so many double-storey schemes need planning permission.[1]
Plandome's fixed fee for this service is £3,000 (VAT_WORDING_TBC). The council's own application fee is separate.