Last Updated on April 8, 2025

Can I Put Double Glazing In A Grade 2 Listed Building? What You Need To Know

Installing double glazing in a Grade II listed building is not as simple as fitting new windows in a modern home. These properties come with legal protections to preserve their architectural and historic significance, meaning any alteration must be carefully considered.

In this comprehensive guide, we’ll explain if and how you can install double glazing in a listed property, what permissions you’ll need, what your options are, associated costs, and expert-approved alternatives. 

Whether you’re a homeowner, landlord, or property manager in the UK, this guide is designed to help you navigate the complexities and make informed decisions.

Can I Install Double Glazing in a Grade 2 Listed Building?

Yes. Double glazing can be installed in Grade II listed buildings, but you cannot proceed without proper approval. Making alterations to windows, such as replacing single glazing with double glazing affects the fabric and appearance of the building, so it requires Listed Building Consent (LBC) from your local planning authority.

Key Considerations:

Expert Tip: Always consult a conservation officer before beginning any work. Engaging an architect or window specialist experienced with heritage properties can help streamline the application process and avoid costly mistakes.

How to Apply for Listed Building Consent

Here’s a step-by-step breakdown:

1. Contact Your Local Planning Authority (LPA)
   
2. Consult a Conservation Officer
   
3. Submit a Heritage Statement with your application
   
4. Include Detailed Plans: Drawings, specifications, and justifications
   
5. Await a Decision: This can take 8–13 weeks

What Happens if You Don’t Get Consent?

Carrying out work without consent is a criminal offence. You could be forced to reverse the work or even face prosecution.

Approved Double Glazing Options for Listed Buildings

Listed building window replacements must meet both thermal and aesthetic standards. Approved options include:

Secondary Glazing

Secondary glazing involves fitting an internal pane behind your existing window, making it a discreet solution for improving insulation. It’s often exempt from Listed Building Consent (LBC) since it does not affect the external appearance. 

Check out our guide on secondary window costs if you’d like to consider this option.

Slimline Double Glazing

Unlike secondary glazing, which adds an internal pane, slimline double glazing is designed to replicate the appearance of traditional single glazing while offering improved insulation. 

It uses thinner glass and narrower air gaps to fit within existing window profiles, making it a popular choice for period properties.

Heritage Timber Frames

Modern timber frames are designed to replicate period features while accommodating double or secondary glazing.

What Is the Average Cost of Installing Double Glazing in a Grade II Listed Building

Installing double glazing in listed buildings typically costs more than standard installations due to the bespoke nature and planning process. Here’s a general breakdown:

If you’re exploring the full costs involved in heritage or conservation-friendly double glazing solutions, our double glazing cost guide goes deeper into material choices, specialist suppliers, and installation considerations.

If you’re considering upgrading the windows across your entire property, not just for listed areas, our new window costs guide offers a comprehensive breakdown of prices by window type, material, and property style, helping you plan with confidence.

Benefits of Installing Approved Double Glazing

Alternatives to Double Glazing for Listed Buildings

If LBC for double glazing isn’t granted, or you’re looking for less invasive options, consider the following:

1. Secondary Glazing

Adds an extra internal pane without altering the original windows. Improves energy efficiency and noise reduction. Often exempt from planning permission. Curious about how secondary glazing compares to double glazing? Our detailed guide breaks it all down.

2. Heavy Curtains or Thermal Blinds

While not a permanent solution, these can significantly reduce heat loss, especially in winter.

3. Draught Proofing

Fitting discreet draught excluders into timber frames can reduce energy bills without compromising aesthetics.

4. Shutters

Internal wooden shutters help insulate windows and are often in keeping with period interiors.

5. Window Films

Low-e films reflect heat back into the room and can be applied to existing glass.

Ready to Upgrade Your Windows the Right Way?

Our expert team has years of experience working with heritage properties and listed buildings. We’ll guide you through planning consent, design options, and professional installation without compromising the character of your home. Request your free window replacement quote today.

Final Thoughts

So, can you put double glazing in a Grade 2 listed building? Yes, but it’s a specialist job that involves navigating heritage regulations, using the right materials, and getting Listed Building Consent.

Working with an experienced heritage window installer is essential to ensure your project is compliant, efficient, and beautiful. Whether you’re restoring a Georgian townhouse or upgrading a Victorian villa, proper planning is key.