CASEBOOK: Appeal Cases; Listed buildings - Mansard roof extension considered misguided

Listed building consent and planning permission have been denied for the construction of a mansard roof at a grade II listed building in west London, with an inspector concluding that the scheme was misguided.

The property had three storeys and a basement and had been carefully restored into an attractive home. The inspector noted that while mansard roofs were relatively common when the house was built in the late 17th century, the building had never been intended to accommodate an additional floor in the manner proposed.

He concluded that the existing roof was intended to be concealed, thereby allowing full appreciation of the scale, proportion and quality of the front elevation. He considered that the construction of a dark slate mansard would be very visible from street level and, by creating an even larger property, constituted a misguided approach to enlarging the dwelling.

DCS No: 38928016; Inspector: Colin Ball; Inquiry.


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