Double Glazing Sash Windows in Listed Buildings

Double Glazing Sash Windows in Listed Buildings: Guidelines and Considerations

Welcome to another instalment of our informative series, where we explore key topics around preserving and improving historic properties. In this post, we’re looking at a subject that matters deeply to owners and custodians of listed buildings: double glazing sash windows in listed buildings.

Balancing modern energy efficiency with the preservation of historic charm can be a difficult task, especially when it comes to traditional sash windows. This article aims to answer common questions such as:

  • Can you replace sash windows in a listed building?
  • Can existing sash windows be double glazed?
  • Can you double glaze single glazed sash windows?
  • Do you need planning permission to replace sash windows?

Let’s explore the regulations and possibilities involved in upgrading sash windows without compromising heritage value.

Can you replace sash windows in a listed building?

Can you replace sash windows in a listed building?

Yes, you can replace sash windows in listed buildings, but it must be done under specific conditions. Any replacements should closely match the original design, and Listed Building Consent is typically required.

Considerations when replacing listed building sash windows

Here’s what you need to know:


Like-for-like replacement


Your new windows must replicate the original in terms of design, materials and craftsmanship. This helps maintain the building’s historic character.


Conservation Area Consent


If your property is in a conservation area, you may also need Conservation Area Consent. This ensures any visible changes fit with the area’s established appearance.


Grade of listing


It’s generally easier to gain approval for Grade II listed buildings than for Grade I or Grade II* properties. Higher grades are subject to stricter regulations due to their exceptional significance.


Seek professional advice


Conservation officers, specialist architects and heritage consultants can help ensure your application meets all requirements.


Consider energy performance


Modern double glazing can improve insulation and comfort. It is possible to install high-performance sash windows that still meet the appearance standards required in conservation and listed settings.


Engage Historic England or your local authority


Before making changes, always check with your local conservation officer or consult advice from Historic England. Their input can help ensure your plans stay on track.


Apply for Listed Building Consent


You will need consent from your local planning authority to carry out any alterations. This includes submitting detailed plans that show how you will preserve the property’s character.


Explore alternative solutions


If full replacement is not allowed, you might consider secondary glazing. This adds a discreet internal layer that boosts insulation without changing the exterior look of the windows. You also may be able to retrofit vacuum glazing into your existing frames.


Balance preservation and modern needs


Ultimately, the goal is to retain the heritage value of your building while making it more comfortable and energy efficient.

Conclusion

Yes, you can replace sash windows in listed buildings, but with certain conditions. Replacements should match the original design, and consent is more likely for Grade II listed buildings.

Replacing sash windows in listed buildings is possible, but it comes with specific guidelines and considerations to preserve the historical significance of these cherished properties.