Replacing Windows in Conservation Areas

Replacing Windows In Conservation Areas

A conservation area is an area of specific architectural or historical interest, the character or appearance of which is desirable to preserve or enhance. Many towns, villages and cities rely on historic windows for much of their architectural impact and character. Poor quality, inappropriate, replacement windows can easily erode traditional features on historic buildings.

If you happen to live within a conservation area there are certain constraints that a local planning authority may apply to your home. This is commonly known as Article 4, when a planning authority applies to restrict development rights in a conservation area. Often older, more traditional buildings are fitted with timber windows simply because timber tended to be the main material used many years ago. Over time this can present a number of problems including the increased chance of rot and the need to consistently restore and paint the windows in order to keep the elements out and the windows preserved and looking nice. Whilst this can provide a good opportunity to refresh the paint colour there are also limitations on colour choices within heritage and conservation areas. Quite often houses that are built alongside rivers or canals are often in conservation areas and can suffer because at times they are exposed to damper weather conditions and therefore more prone to rot.

So what choices are there if you happen to live in a conservation area? Replacement windows need planning approval and conservation area consent, this is quite rightly done to preserve architectural merit. Initially some planning authorities precluded the use of modern materials because the window designs were inappropriate in size, shape and design. Thankfully a more modern approach has been to approve the use of a product called Residence 9 because of its consideration of the Article 4 directives. Residence 9 has been specifically designed to replicate the documented historical window designs from the period. The use of modern material should be accepted provided that the window is of design, dimensions, detailing and opening mechanisms are similar to the original window.

When it comes to listed buildings it is generally more difficult to replace windows in these buildings and approval must be obtained via English Heritage or Historic Scotland. They are the most important buildings in the town and are protected nationally with specific control over alterations, it is generally preferred to repair windows in listed buildings.

Replicate 19th Century Timber Window Designs With Modern Features And Benefits

The design brief for Residence 9 was to extract the key principles, shapes and dimensions from the Article 4 Conservation Area guidelines for windows, and integrate market-leading technology into the design using virtually maintenance free materials. Residence 9 is thermally and acoustically brilliant. It features the latest security, maintenance and performance innovations, whilst appearing traditional. Your windows and doors won’t warp, swell, flake or need sanding and painting.

Authenticity And Energy Efficiency

Residence 9 has 9 chambers and is 100mm wide, resulting in superior thermal, acoustic, strength and security performance. It achieves a certified window energy A+ rating and accommodates the most thermally and acoustically efficient 44mm triple glazing and 28mm double glazing. Attaining U-values of 0.8 with triple glazing, PassivHaus Standard, and 1.2 with double glazing far surpassing the British Building Regulation requirements. All of this contributes to lower energy bills, keeping you cosy in the winter and cool in the summer.

GHI Windows is a leading installer of the Residence 9 window system, marketed under their Heritage 100 brand. Heritage 100 is a highly innovative window system, designed to replicate the 19th-century flush sash timber window.

Quintessentially British, the Heritage 100 window holds its heritage very dear, hand finished by craftsmen with traditional jointing, available in a wide range of colours and with a large range of window furniture options and accessories, this bespoke window adheres to article 4 directives of the conservation area guidelines.

Heritage 100 is a combination of both old and new, meaning that this timber alternative has the qualities to improve any home.


  • Ideal for stately, Georgian, Victorian and modern homes
  • Replicates original timber flush windows with the advantages of modern double glazing
  • The only timber alternative windows to have working original furniture
  • Comes in a variety of heritage colours and wood effect finishes
  • Includes maintenance free composite materials with easy clean rebates
  • Bespoke customised designs including a variety of colours and hardware designs
  • Includes a thermally efficient 9 chamber design easily achieving an A rating
  • High-security locking system
  • High weather performance
  • Has a unique frame design at 100mm
  • Mechanically jointed with foiled rebates to achieve an authentic look
  • Since 2013 GHI Windows have been at the forefront of Residence 9 installations. A strict criteria applies when supplying and fitting Residence 9 and GHI is proud to achieve this accreditation. We have a wealth of knowledge and an unrivalled in-house installation team, fully trained on Residence 9.
  • To see examples of some of our many Residence 9 installations click here. With any renovation, it is highly recommended to obtain prior consent from your planning/conservation officer before proceeding with any alterations.

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