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    Energy Savings Estimator

    Calculate how much you could save on heating bills with secondary glazing. Get an instant estimate based on your property details.

    £

    UK average is approximately £1,500-£2,000 per year

    Why Secondary Glazing Saves Energy

    • Reduces Heat Loss by up to 65%

      The air gap between windows acts as an insulating barrier

    • Eliminates Cold Drafts

      Sealed units prevent cold air infiltration

    • Reduces Condensation

      Warmer inner pane prevents moisture buildup

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    Sources & References

    Authoritative sources supporting the information on this page.

    1. Historic England (2016). Energy Efficiency and Historic Buildings: Secondary Glazing for Windows. Historic England.Open source

      Technical advice on choosing and installing secondary glazing in older and listed buildings.

    2. HM Government (2021). Approved Document L: Conservation of fuel and power. The Building Regulations 2010.Open source

      The statutory guidance on the thermal performance of windows and building fabric in England.

    3. UK Parliament (2015). The Energy Efficiency (Private Rented Property) (England and Wales) Regulations 2015. legislation.gov.uk.Open source

      Sets the minimum EPC standards for privately rented homes, relevant to landlords improving windows.

    4. Energy Saving Trust (2024). Energy efficient windows and doors. Energy Saving Trust.Open source

      Independent consumer advice on how glazing upgrades, including secondary glazing, reduce heat loss.

    5. British Standards Institution (2014). Guidance on sound insulation and noise reduction for buildings (BS 8233:2014). BSI Standards.

      Sets the recommended internal noise levels for bedrooms and living rooms used to judge how much glazing performance a home needs.