We may be the UK’s number one manufacturer of bespoke secondary windows, but we don’t rest on our laurels.

From the very beginning we have been firmly focussed on the guiding principles of being a trusted advisor as well as the very best manufacturer.

Our aim is to provide the best possible product, together with excellent service. To that end we’ve been focussed on delivering great quality, value and service to our customers for over 20 years.

No other manufacturer has the wealth of talent, products, experience and support to deliver a better secondary glazing solution to your home.

Whether it’s for the added security, condensation control, noise reduction or energy efficiency, our products provide years of robust, trouble-free service.

Our confidence in our products is backed up by an industry-leading five year warranty on frames and glazing and two year warranty on moving parts.

We continually invest in technology and production to ensure you can buy in complete confidence.

Granada products not only provide excellent thermal and noise insulation, our choice of finishes and styles have a discreet, unobtrusive finish that is sympathetic to the surroundings and most existing window styles.

Our local partners cover the whole of the UK and we pride ourselves on the knowledge and backup we provide.

Convinced? Just take a look at the many testimonials, thank you letters and messages of support we receive. We’re confident you soon will be.

Call 0845 900 3899

The benefits

Sound Insulation

Secondary glazing offers the most effective sound insulation – significantly outperforming double glazing. From noisy roads to noisy kids, our windows can reduce noise levels by up to 80%

Thermal Insulation

Substantially improves the thermal insulation of existing single-glazed windows – reduces heat loss through the window by around 65% – around 10% more than double glazing.

Increased Security

Secondary windows offer an affordable, discreet, highly effective solution to enhancing building security. No external access is required, ideal for multi-storey buildings.


Granada secondary glazing will complement your home, providing maximum benefits and years of trouble-free service, specified and designed for thermal and sound insulation.

Retain Character

As the Granada range is slim line and discreet it has been specifically designed for listed building windows, conservation areas and heritage properties.

Condensation Solution

Where condensation is a major issue, we often specify secondary glazing with balanced trickle ventilation. This provides a simple, cost-effective, and permanent solution.

Our Homeowner Products

Our homeowner products include horizontal and vertical sliders, and other bespoke secondary glazing windows. Every commercial project is unique, we offer a full managed solution from design, manufacture and installation. What remains the same is complete project management focus and attention to detail.


Nelson Road & King William Walk – Greenwich

Newly refurbished townhouses situated next to a corner unit designed by Joseph Kay in 1839 are a registered Grade II Listed Building. As part of the wider West Greenwich Conservation Area boasting stunning Architecture and Historical Importance. The townhouses built...
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Secondary Glazing Bay Window

Cold Bay Window – South Yorkshire

Timber windows give a property, charm and character. Over time they can leak vital heat, for the winter months this can cause a room to feel cold and also increase energy bills. A solution to this is to fit secondary glazing which can decrease noise levels breaching...
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Lady with Secondary Glazed Windows

Lyndhurst Road, Sheffield

"The condensation issues that I’ve been putting up with for 28 years have finally been resolved. You can’t fail to notice the noise reduction either — our new secondary glazing provides a feeling of quiet and calmness." Diane Hale, Homeowner Sheffield resident Diane...
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