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Can Windows in a Listed Building Be Replaced?

 

Windows in a listed building can be replaced, but the local planning authority will usually expect clear evidence that replacement is necessary.

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Historic windows should generally be retained where they remain capable of repair. Complete replacement may be considered where the frames are severely decayed, structurally unsound or beyond reasonable restoration.

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Even replacing a window with a similar or apparently identical design may require listed building consent because the work involves removing historic fabric. Historic England recommends checking the requirements with the local authority conservation officer before starting work.

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Unauthorised alterations to a listed building can have serious consequences, so approval should be obtained before the existing windows are removed.

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Repairing Original Windows

 

Repair is normally the first option for traditional timber windows.

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Well-made historic windows can often be restored even where they appear weathered or draughty. Repair work might include:

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• Replacing decayed timber sections

• Renewing sash cords and weights

• Repairing joints

• Replacing damaged panes

• Renewing putty

• Adjusting hinges and catches

• Installing discreet draught seals

• Repainting and weatherproofing

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Like-for-like maintenance and minor repairs may not require listed building consent where they do not affect the building’s special interest.

 

However, the position should be confirmed with the conservation officer, particularly where substantial historic material will be removed.

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Repairing the original windows can preserve more of the building’s historic fabric while improving their appearance, operation and resistance to draughts.

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Double Glazed Windows for Listed Buildings

 

Installing double glazed windows in listed buildings may be possible, but acceptance will depend on the significance of the existing windows and the visual effect of the proposed glazing.

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Standard double glazed units can require thicker frames and glazing bars than traditional single glazing. This may alter:

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• The depth of the glass

• Reflections across the elevation

• Glazing-bar proportions

• Frame profiles

• The position of the glass within the frame

• The appearance of historic crown or cylinder glass

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Historic England advises that inserting double or triple glazing into historic windows will usually require listed building consent.

Replacement of historic windows with double glazing will ordinarily affect the building’s special interest unless the proposal can be shown to cause no harm.

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Slim-profile double glazing may sometimes be acceptable, particularly where the existing windows are later replacements or where carefully designed new windows can reproduce the historic appearance.

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Approval should never be assumed simply because the new windows are described as heritage or conservation products.

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Heritage Windows for Listed Buildings

 

Appropriate heritage windows for listed buildings should be designed specifically for the property rather than selected solely from a standard product range.

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The local authority may consider:

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• Timber species

• Frame and sash profiles

• Glazing-bar thickness

• Traditional jointing

• Sash horns

• Opening arrangements

• Historic glass

• Cill and frame details

• Paint colour

• Position within the wall opening

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Where replacement is permitted, traditional timber windows are frequently preferred because their dimensions, mouldings and joinery can be made to closely match the originals.

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A detailed window survey can help identify which windows are original, which are later replacements and which elements should be retained.

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UPVC Windows for Listed Buildings

 

Standard UPVC windows are unlikely to be considered suitable where original timber windows survive or where the replacement would harm the building’s special architectural character.

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UPVC frames commonly have wider sections, different joints, heavier glazing bars and different surface finishes from traditional painted timber. These differences can remain visible even where the basic window arrangement appears similar.

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Historic England states that replacing historic windows with PVCu windows will usually be harmful to the character and appearance of a listed building.

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There may be exceptional cases where an existing modern window is being replaced and a suitable alternative causes no additional harm. The decision will depend on the individual building and the views of the local planning authority.

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Secondary Glazing

 

Secondary glazing can provide an alternative where the original windows should be retained.

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A separate glazed panel is installed internally behind the existing window, allowing the external frame and glass to remain largely unchanged. Properly designed secondary glazing may improve:

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• Thermal performance

• Draught resistance

• Noise reduction

• Comfort

• Security

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Secondary glazing is often less visually disruptive than replacing original windows with double glazed units. However, listed building consent may still be needed if the installation affects historic shutters, panelling, architraves or the character of the interior. Historic England recommends secondary glazing as one possible method of upgrading historic windows while retaining original fabric.

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Listed Building Consent and Planning Permission

 

Listed building consent and planning permission are separate forms of approval.

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Listed building consent is required where alterations would affect the building’s special architectural or historic interest. Window replacement, changing from single to double glazing or materially altering frame details will commonly require consent.

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Planning permission may also be required where the proposed work changes the external appearance of the building, affects a flat or maisonette, alters the window opening or involves other development.

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A property can also be both listed and located within a conservation area, meaning that additional planning considerations may apply.

The local planning authority should confirm whether the project requires:

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• Listed building consent

• Planning permission

• Both applications

• Building Regulations approval

• Consent from a freeholder or management company

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Elevation Plans and the Planning Application

 

A proposal for replacement windows in a listed building will normally require carefully prepared elevation plans and supporting information.

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The drawings should clearly show the existing building and the proposed alterations. Depending on the project, the application may include:

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• Existing and proposed elevations

• The position of every affected window

• Window schedules

• Detailed frame drawings

• Horizontal and vertical sections

• Glazing-bar profiles

• Cill, head and reveal details

• Materials and finishes

• Opening arrangements

• Photographs of the existing windows

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The plans should be accurate enough for the conservation officer to compare the existing and proposed windows and understand exactly how the appearance will change.

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A listed building consent application may also require a heritage statement explaining the significance of the windows, their condition, why replacement is necessary and how the proposed design preserves the character of the building.

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Planning permission should be submitted alongside listed building consent where both forms of approval are required. Consent should be secured before windows are manufactured or installation work begins.

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TIP: Visit Draw Plans for a FREE Quote for Elevation Drawings & Planning Application Services

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Replacement Windows in Conservation Areas

 

The rules for replacement windows in a conservation area are different from those applying to a listed building.

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Conservation area designation does not automatically mean that every replacement window requires planning permission. However, permission may be required where an Article 4 Direction applies, permitted development rights have been removed or the new windows materially alter the external appearance.

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Where a building is both listed and located in a conservation area, the listed building controls will continue to apply regardless of whether the replacement might otherwise be permitted development.

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Building Regulations

 

Listed building consent does not remove the need to consider Building Regulations.

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Replacement windows may need to comply with requirements relating to:

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• Thermal performance

• Ventilation

• Safety glazing

• Means of escape

• Structural support

• Protection from falling

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Building Regulations guidance recognises that historic buildings sometimes require a flexible approach so that improvement work does not cause unacceptable damage to historic fabric or appearance.

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The technical and heritage requirements should therefore be considered together from the beginning of the project.

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Find Trusted Listed Building Window Specialists

 

The design and installation of windows for a listed building requires specialist care. Inappropriate profiles, glass, materials or installation details can significantly alter the character of the property.

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APN Double Glazing can connect homeowners with experienced local specialists for traditional window repairs, heritage glazing, secondary glazing and carefully designed replacement windows.

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Where consent is required, properly prepared elevation plans and a planning application or listed building consent application should be completed before installation begins.

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Get in touch for expert advice and a free, no-obligation quote for windows in a listed building.

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