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Secondary glazing for listed building windows

Secondary glazing involves adding a single glazed window to the inside of an existing window. Cheaper than purchasing replacement windows, this extra pane of glass also provides another layer of security for your home. However, that’s not the only benefit it has; secondary glazing also actively traps more heat in the home, leading to cosier interiors and the potential to decrease your energy bills. However, noise reduction is where secondary glazing really excels; fitting it to your home will prevent a huge amount of external noise from coming inside, letting you enjoy your home surroundings much more peacefully.

As secondary glazing sits on the inside of the property’s window frames and is classed as an easy access removable alteration, it’s often approved for use in conservation areas and others where planning restrictions are in place too, without impacting on building regulations. Available for fitting to a wide range of different styles and types of premises, it’s also an ideal solution for use on more contemporary North West homes.


At Droylsden Glass, we only sell products of the highest standard, so we have chosen to use Granada as our secondary glazing supplier. By installing secondary glazing, you can improve your home’s thermal insulation, reducing heat loss by up to 65% and significantly reducing noise levels.

Granada products have all been subject to meticulous testing procedures in line with BS EN ISO 10077-2. The table below gives an overview of the test results and shows how secondary glazing can drastically improve performance and U-values, saving you money on your heating bills.

U-values measure how effective your windows are as insulators – the lower the score, the better their thermal performance will be.

Product type U-Value Primary Window U-Value Primary + Secondary Window U-Value Improvement
Slimline Hinged Unit 4.7 W/(m2K) 1.4 W/(m2K) 70%
Horizontal Sliding Unit 4.7 W/(m2K) 1.5 W/(m2K) 68%
Vertical Sliding Unit 4.7 W/(m2K) 1.5 W/(m2K) 68%
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    We can fit secondary glazing to several different styles of window across the North West of the UK, including:

    Enquire for more information


    Triple Glazing


    We’re well aware that secondary glazing might not be suitable for everyone’s requirements. But, we also install double glazing and triple glazing, which you might find are better suited to your needs. Take a look at our window buying guide for our expert advice on which glazing type is the best for your home.

    Check out our double glazing


    • Secondary Glazing

    • Horizontal Slide

    • Hinged Unit

    • Tilt-in

    Customer Reviews

    We have achieved and built our reputation from our independent customer reviews.

    Buying Process

    Design and order

    We will design the perfect home improvements to suit your individual requirements, completing your order down to the specific details.


    We will visit your home at a convenient time to complete a full site survey. This will ensure any necessary regulations are adhered to.


    All of our double-glazing products are manufactured by highly skilled experts who use industry-leading techniques. This ensures the maximum product quality.


    Our fully qualified installers will fit your new products in a turn-around time as short as possible, as we know how busy homeowners are.


    All of our products come with a 10-year guarantee. In the unlikely event of an issue, our service team will be able to assist you with our extensive aftercare services.

    Accreditations & Awards

    We are accredited by a variety of highly reputed regulating bodies that cover the construction industry.

    Certass logo
    Installer Awards. Highly Commended
    The Furniture and Home Improvement Ombudsman logo.
    Pride of Tameside award 2017 Property & Construction Business of the Year
    QA National Warranties

    Improving homes in the North West of England

    We have been carrying out quality installations in Chester, Warrington, Wirral, Trafford, Bolton, Oldham, Manchester, Cheshire, Tameside & Stockport for over four decades. View our products by visiting our showroom today.

    Where to find us

    42-56 Audenshaw Road
    Manchester, M34 5HJ

    For sat navs use the address below
    York Street, Audenshaw, Manchester, M34 5HJ

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