Secondary Glazing

Secondary glazing involves fitting a discreet internal window in addition to your existing window. It’s a cost effective and efficient way to insulate and sound-proof your windows, and perfect for use in Listed Buildings and conservation areas.

Face or Reveal Fix

Made from durable aluminium, frames are slim, unobtrusive, and require little maintenance. They’re also easy to install by fixing to your existing window (“face-fixed”) or into the window reveal (“reveal-fixed”).

With a reveal-fix, having a 100mm-200mm air gap between secondary glazing and your existing windows will provide optimum performance – preventing heat and sound from passing through.

Clear Benefits

Recommended by English Heritage, the Listed Property Owners Club and the Energy Saving Trust, the benefits of secondary glazing include:

  • Noise reduction
  • Minimise drafts
  • An additional security barrier
  • Condensation control
  • Reduced carbon footprint
  • Available Options

All aluminium frames are painted white as standard, though you can select from over 200 RAL colour options – to mirror the look and feel of your home.

Windows are made to measure, with options to accommodate nearly all window styles. Horizontal sliders are the most popular choice, though we can supply and install vertical sliders, hinged units, fixed and lift-out windows.

Our secondary glazing can even be curved to form arched units.

Sound Insulation

When sound-proofing is paramount, we recommend using a different glass thickness in your secondary glazing than that of your existing windows. Special acoustic glass provides maximum noise reduction.

Thermal Insulation

For maximum thermal performance we specify “low E” glass, which has a special heat reflecting coating to help keep heat within the room. We’ve helped thousands of homeowners and commercial clients over the past 20 years. We’d like to think that we can help you too.


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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Bush House, London

Former home to the BBC, and now luxury office space, Bush House was renovated as part of a two-year, £60 million project back in 2012. JLL, ISG and John Robertson Architects were appointed to upgrade and restore the historic building in just 77 weeks. Nevertheless, a...
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Marriott Hotel, Park Lane

"We were delighted with Granada’s initial design input and continuing technical support. The flexibility of their secondary glazing allowed us to reduce noise intrusion, whilst retaining the aesthetics required by the design team." Mark Spanner, Director, John Mowlem...
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