The proposal would be controy to the criteria set out in Part 2 of the Authority's Design Guidance (Dormer Windows and Rooflights) and Development Policies 3 and 19 of the NYM Core Strategy and Development Management Policy Documents. Roundhill House, Aislaby is an attractive property which faces onto the main village thoroughfare and falls within Ailslaby Conservation Area and designated Article 4 area. The alterations to the property are considered to be harmful to the character of the building and the Conservation Area and will have significant impact on the traditional vernacular appearance that the property strongly emphasises. The proposal to insert 3 no. dormer windows to the front roofslope particularly weakens the roofscape. Together with the insertion of replacement uPVC windows and rear rooflights the proposed alterations are such that the strong architectural style, character and appearance of the host building would be lost.
Development Policy 4 of the NYM Core Strategy and Development Management Policy Documents requires development proposals to preserve or enhance the character or appearance of the Conservation Area whether or not the proposal is prominent or available to public view. The overall net impact of the proposal will cause significant harm to the character and appearance of the host building by reason of the introduction of incongreous non-traditional UPVC material and design detailing (including sash and glazing bars) associated with replacement UPVC windows and to the Aislaby Conservation Area. The development therefore fails to meet the requirements of the National Planning Policy Framework and Core Policy G and Development Policy 4 of the NYM Core Strategy and Development Management Policy Documents.