These are allowed on roofs/walls providing they are not installed above the ridgeline of the roof and do not project more than 200mm beyond the plane of the wall or roof surface. In a conservation area, they are not permitted on any wall which fronts a highway and are not permitted if installed anywhere within the curtilage of a Listed Building. Solar panels must be sited to minimise the effect on the external appearance of the building. Listed building consent will be required to install solar panels on listed buildings.