Permission for development of a two-storey roof extension at a 623 sq.m site. The proposed development will comprise the following: The removal of the existing lift overrun structure and lift motor room, water tanks, service plant, 5 no. non-original roof lights and 4 no. disused chimneys to the rear at roof level to facilitate the provision of a 2 no. storey extension at sixth and seventh floor levels, with 776 sq.m floor area with terrace areas of 92 sq.m. The proposed works will also include the raising of 5 no. chimneys by 450mm, general fire safety upgrades and the replacement of an external steel fire escape and open walkways to the rear serving first to fifth floor levels. The proposed extension comprises a part cantilevered structure with metal cladding on top of the existing 6 no. storeys over basement Protected Structure, bringing the total height to 27.9m above ground (excluding lift overrun), increasing the total gross internal floor area by 831 sq.m. bringing the total gross floor area to 4,049 sq.m. The proposal consists of the addition of 27 no. ensuite bedrooms, terraces at sixth and seventh floor levels, a covered walkway across an existing lightwell at sixth and seventh floors to provide safe access doors from bedrooms within the pitched roof enclosure. The proposed roof structure will also incorporate perforated metal panels to provide natural ventilation to the new consolidated and concealed plant areas at roof level. The proposed fire safety works comprise fire protection upgrades to the existing internal staircase including new glazed fire screens at second to fifth floor levels, the provision of an enclosed firefighting stairs with metal cladding from first floor to seventh floor levels and new external covered walkways at first to fifth floor levels replacing the existing external steel fire escape stairs and open walkways. The proposed scheme also includes a new ventilated lobby to a new fire-fighting lift within the existing lift shaft servicing basement to seventh floor levels, the reconfiguration of the east elevation window at each of the first to fifth floor levels facing Harcourt Court, the relocation of the existing fire exit from the dining room at ground floor, the provision of a new emergency escape stairs from basement to ground floor with a new exit door to the rear courtyard with associated minor alterations to the existing external wall. The proposed development also includes sundry minor internal partition alterations to facilitate the new firefighting lobby, a new bespoke platform lift to the main entrance and all ancillary site development works.
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