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Timber Box Sash Window Replacement In Conservation Areas


Preserving our heritage areas in London through conservation ensures that the best of the past is kept to enrich our lives today and in the future. Barnsbury Joinery has years of experience providing the finest solid timber box sash windows and doors, we have carved out a solid reputation with conservation teams across London and Hertfordshire. From our reputation, we are in a strong position to offer sound and impartial  help and advice on conservation and planning in your area. Customers across London and Hertfordshire can rest assured they’ll be working with a team of highly skilled tradesmen and women who take great pride in their contribution towards lasting heritage.

Home owners can normally make minor alterations to their houses without requiring planning permission.  This is called “permitted development”.  However, in Conservation Areas, the Council has removed these “permitted development rights” by making an Article 4 Direction. Article 4 Directions are made under part of the planning legislation called the Town and Country Planning (General Permitted Development) Order 1995.  The effect of a Direction is that planning permission is required for specified classes of works that are carried out on any elevation facing a highway. Typically, these are:


– Making any alteration to the roof, including replacing the slates or tiles, putting in a roof light or altering dormer     windows (the insertion of dormer windows requires planning permission in any event)

– Removal, replacement or alteration of windows and doors

– Painting or rendering external brickwork. 


NB – It is always best to check the specifics of any given conservation area directly with your local Conservation Officer. 


An Article 4 direction does not prevent you from altering or repairing your home. Repair and maintenance work which does not change the appearance of the property will not need planning permission provided that the same types of materials are used. This means that any sash window, casement window, door or shop front restoration undertaken by Barnsbury Joinery, will not require planning permission.

Barnsbury Joinery have worked in many Conservation Areas and with many Conservation Officers across the country and, where appropriate, we are able to obtain written confirmation that any proposed work does not require planning permission on our client’s behalf. In cases where planning permission will be required, we can provide detailed specification, samples and drawings to support your application. 


Many conservation officers will not allow existing single glazed box sliding sash windows to be refurbished and double glazed as this normally will alter the exterior appearance of a property. However, our custom made replica double glazed sashes have so far been approved in 100% of Conservation Areas where we have submitted details of our specification directly to the Conservation Officer. This applies to both Victorian and Georgian (the small squares) styles of window. 


​To save time at Barnsbury Joinery we have implemented an online quote request system. Once we receive your request we will endeavor to contact you within 24 hours. If you require assistance or would like to discuss your requirements, please do not hesitate to contact us directly on 0207-1646305 and we will be happy to help you.


At Barnsbury Joinery we service all of London and Hertfordshire. Including Islington, Hackney, Hampstead, Primrose Hill, Camden, Stoke Newington, Clapham, Angel, Canonbury, De Beauvoir Town, Farringdon and Clerkenwell. Please call Barnsbury Joinery now to find out if we work in your local area. 

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