Considerations & Guide to Upgrading Historic & Listed Buildings
Read our guide here on listed buildings and historic upgrades.
We can help you with a listed building as well as conservation areas. Conservation areas are easier, as they will just require planning permission, and then you can proceed with the project. For listed buildings, you will require specialist products such as our sash windows to fully emulate the style of replacement windows and ensure that these meet the strict regulations that are applied by your Local Planning Authority.
| Category | Key Considerations | Recommended Approach |
| Planning & Legal | Listed Status (Grade I, II*, or II) and Conservation Area rules. Conservation is more relaxed and will require planning permission, but doesn’t require the strict like-for-like regulations for listed status. | Always consult your Local Planning Authority (LPA) before starting. Unauthorised work can be a criminal offence. |
| Material Matching | Original timber used and style will need to match the styles to the letter. | Use matching timber; avoid uPVC or standard aluminium, which are rarely permitted. This is because they can emulate the look of timber, but planning will often be denied due to the “protected status” of the building. |
| Glazing Style | Crown or cylinder glass has a distinct “wave” or “wobble.” This is a very distinct style that also has to be emulated, with modern double glazing available, but it has to be very stylised and specifically manufactured glass. | Use Slimline Double Glazing (vacuum-sealed) or “Heritage Glass” to mimic the original reflections. This is used to provide the benefits of double glazing while also conforming to the strict regulations for listed buildings. |
| Joinery Details | Width of glazing bars (muntins) and putty lines. | Ensure “true” divided lites rather than “stick-on” bars. Use traditional putty-line beads. Advanced joinery can be circumvented by using specialist products, especially for fenestration. |
| Thermal Efficiency | Heat loss through glass vs. air leakage through gaps. Single glazing is often only permitted, which can cause high energy bills and poor energy efficiency. | Prioritise draught-proofing and secondary glazing over full replacement where possible. This is highly important to improve thermal efficiency, to ensure that you are saving money on energy bills in a listed building, which is notorious for having high energy costs. |
| Ironmongery | Historical accuracy of latches, stays, and sash pulleys. | Refurbish original brass/iron hardware or source authentic cast replicas that emulate the style of the materials. |
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Why Are Regulations So Strict on Listed Status Buildings
Listed Status buildings are of “special architectural or historical interest” for current and future generations. This strikes a fine balance between keeping them functional for modern use and keeping their historic look.
This makes regulations very strict on what can be changed, and will not permit many materials to be used because you will need to match the material and the aesthetics of the windows and doors (fenestration) that you are trying to change.
This can make upgrades tricky, especially if you don’t have double glazing, as this can also be denied because the aesthetics don’t match the existing windows. The reflections and visual spacers do not match the period, so this leads to them being rejected.
Products That Can be Used
Sash windows are a fantastic solution for double-glazing issues, as they can be designed and constructed to match the aesthetic of the property. Period windows are often single-glazed, which provides poor sound and thermal insulation. We can work with you to design a sash window that matches the property and provides the benefits of double or triple-glazing.
It’s still required to apply for permission and to wait for comments from your local authority on what will be permitted before starting any works, and we will advise you on this before you make the application.
Sash windows are the best way to upgrade period windows in many particular styles, but it’s important to note that some styles may be too unique to be matched without bespoke work.
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Here at Homeglaze we’re a local double glazing installer in Chigwell, Essex. We have been a trusted home improvement specialist since 2011.
We offer Windows, Doors, Conservatories, Conservatory Roof Replacements, Porches & More. Get in touch with our team now for a free quote.
Is a Conservation Area the Same as Listed Status?
You can have a listed building within a conservation area, but they are not the same thing. A conservation area is a designated area for special historic or architectural interest, so it is protected by local authorities.
These areas have stricter building regulations than permitted development, and you will likely have to receive planning permission for works, similar to listed buildings. The regulations are more lenient than listed status, we have written an entire article to advise you on conservation areas here.
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