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Case Study - London

Window replacement projects in the centre of London

Project Requirements

Arden Windows were approached by a Main Contractor that was looking for a manufacturer and installer of high quality sliding sash windows to replace several hundred windows across various properties in the centre of London on behalf of the Borough. The client’s key considerations were to ensure that their residents were provided with a thermally efficient high-performance window that would provide a better home whilst ensuring planning authorities and local conservation were content with the design and aesthetics of the replacement windows.


Due to Arden’s involvement with the project at an early stage we were able to offer assistance with the submission of the planning applications including discussions with conservation officers for the area. Ultimately Arden surveyed the properties, produced drawings to demonstrate existing and proposed details for the replacement windows and achieved full planning consent. During the process, Arden representatives worked directly with the Conservation officers including providing sample windows and attending a number of meetings in an effort to ensure that the replacement double glazed windows were acceptable to all parties. One of the key issues encountered was the initial reluctance of the Conservation Officer to allow the single glazed windows to be replaced by double glazed units using a bonded spacer bar as opposed to a more traditional solid glazing bar. As the client was keen to ensure costs were kept to a minimum and thermal performance was improved the preferable choice was to use Arden Windows Kinward sliding sash window with a bonded bar and a “plant on” timber glazing bar. Once Arden had manufactured a full-size sample window this was shown to the Conservation officer and the benefits explained. Due to the traditional appearance of the Arden Kinward window, the planning applications were approved and the project was able to proceed.  


Double glazed high-performance windows and doors improved energy efficiency, whilst retaining the traditional appearance of the property. The Kinward sliding sash windows provide not only comfort in the home in terms of energy saving but also due to the Secured By Design accreditation homeowners may feel secure in their property. Designs in the Kinward range include Weights and Pulleys, Slide and Tilt and concealed operation, all certificated to Secure By Design standards. Arden’s Kinward Heritage Sliding Sash window has just achieved a u-value calculation of 1.1W/m2K.


As Arden progressed with the installation a number of the residents of the already completed flats commented on how pleased they were with the windows and how they could already feel the improvements in thermal performance.


Before project started



After project completed


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