The proposed mansard roof addition is considered by virtue of its size, bulk, design and location, to be detrimental to the character and appearance of the property, the terrace it is located within and the Conservation Area, and is therefore contrary to the Council's Policies which seek to maintain and enhance the character and appearance of the Borough and its Conservation Areas, as stated in the Council's Unitary Development Plan in particular Policies CD27, CD44, CD45, CD50, CD61 and CD62.