Secondary Glazing

Made-to-Measure Secondary Glazing

Our bespoke secondary glazing is a practical and effective way to improve the thermal performance, comfort, and acoustic insulation of your existing windows without replacing them. Installed discreetly on the inside of your existing frames, secondary glazing provides an additional barrier against heat loss, external noise, and draughts while preserving the original appearance of your property.

Ideal for period homes, listed buildings, and properties within conservation areas, secondary glazing allows you to enhance energy efficiency without compromising the character of your windows.

At ERW, every secondary glazing unit is supplied to your chosen specifications, ensuring a precise fit and seamless appearance. Available in a range of styles, including vertical sliders, horizontal sliders, hinged units, fixed panels, lift-out units, and arched designs, our bespoke solutions can be tailored to suit almost any window configuration.

Finished in a choice of RAL colours, our secondary glazing is designed to integrate discreetly with your existing windows while delivering exceptional long-term performance.


Features of Our Secondary Glazing
Designed for Listed Buildings & Conservation Areas

Secondary glazing is an ideal solution where replacing original windows is not practical or permitted, helping to preserve the character of historic properties while improving comfort and performance.

Improve Energy Efficiency

By creating an additional insulating barrier, secondary glazing helps reduce heat loss, improve thermal performance, and lower energy bills throughout the year.

Reduce Outside Noise

Secondary glazing can significantly reduce external noise, creating a quieter and more comfortable living environment, particularly for homes near busy roads or urban areas.

Made to Measure

Every secondary glazing unit is manufactured to your chosen measurements, ensuring a perfect fit and minimal visual impact on your existing windows.


Frequently Asked Questions
What is secondary glazing?

Secondary glazing is an additional glazed panel installed on the inside of an existing window. It improves insulation, reduces noise, and enhances comfort while preserving the original external appearance of the property.

How does secondary glazing work?

Secondary glazing creates an insulating air gap between the original window and the internal glazed panel. This helps reduce heat transfer, minimise draughts, and dampen external noise entering your home.

Is secondary glazing worth it?

Yes. Secondary glazing is often a cost-effective alternative to replacing windows, particularly for period properties and listed buildings where preserving original features is important.

Does secondary glazing reduce noise?

Yes. Secondary glazing can significantly reduce the amount of external noise entering your property, making it particularly beneficial for homes located near roads, railways, or busy urban areas.

Does secondary glazing stop condensation?

While it cannot eliminate condensation entirely, secondary glazing can help reduce condensation by improving the internal surface temperature of your existing windows and reducing cold spots.

Can secondary glazing improve energy efficiency?

Absolutely. Secondary glazing helps minimise heat loss and improve thermal insulation, making your home more energy efficient and comfortable throughout the year.

Is secondary glazing suitable for listed buildings?

Yes. Secondary glazing is widely used in listed buildings and conservation areas because it improves performance while preserving the original appearance of historic windows, subject to any relevant permissions where required.

Does secondary glazing require planning permission?

In most cases, internal secondary glazing does not require planning permission. However, requirements can vary for listed buildings and conservation areas, so it’s always advisable to seek professional guidance.

Secondary glazing vs double glazing: what’s the difference?

Double glazing replaces the existing window with a sealed glazed unit, whereas secondary glazing adds an independent glazed panel to the inside of the original window. Secondary glazing is often the preferred solution for heritage properties where retaining original windows is important.

Get In Touch

We are trusted by homeowners for creating beautiful, bespoke timber windows, doors and outdoor living products.

Name(Required)
We request your post code to verify you live within our service area, this is not used for marketing.

We will call you to discuss your enquiry, could you please let us know what would be a suitable time for us to contact you?

This field is hidden when viewing the form

Recent Testimonials

Need some advice?

You can reach a member of the team by calling 01642 456167 or emailing info@erwltd.co.uk and we will get back in touch.

Alternatively, you may wish to browse our range of brochures and guides.

Contact Us Request our Brochure

Brochure Download