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    Secondary Glazing Prices London 2026 — Full Per-Window Cost Guide

    Honest secondary glazing prices for every London property type — from £450/window for standard acoustic glass to £650/window for conservation-grade heritage installs. Every quote includes a free survey, professional installation and our warranty — 10 years as standard, 25 years on premium and heritage packages.

    Our Packages

    Standard

    Perfect for typical noise reduction needs

    £450per window
    • 6.4mm acoustic laminated glass
    • Slim aluminium frames
    • Standard colour options
    • Up to 45dB noise reduction
    • 10-year warranty
    • Professional installation
    Get Free Quote
    Most Popular

    Premium

    Maximum noise reduction performance

    £550per window
    • 10.8mm acoustic laminated glass
    • Ultra-slim aluminium frames
    • Full RAL colour range
    • Up to 50dB noise reduction
    • 25-year warranty (premium & heritage)
    • Professional installation
    • Priority scheduling
    Get Free Quote

    Heritage

    For listed & conservation properties

    £650per window
    • Conservation-grade specifications
    • Period-appropriate designs
    • Invisible fixing options
    • Listed building approval support
    • 25-year warranty (premium & heritage)
    • Specialist installation
    • Conservation officer liaison
    Get Free Quote

    What Affects Your Price?

    Every project is unique. Here are the main factors that influence your final quote.

    1

    Window Size

    Larger windows require more materials and careful handling

    2

    Glass Specification

    Thicker acoustic glass provides better noise reduction

    3

    Opening Style

    Sliding, hinged, or fixed panels have different costs

    4

    Access & Complexity

    High windows or difficult access may require special equipment

    Additional Costs Guide

    On-site survey & assessmentFREE
    Design consultationFREE
    Detailed written quoteFREE
    Standard installationIncluded
    Removal of existing secondary glazingFrom £50/window
    Difficult access installationQuote on assessment
    Bay window premium+15-25%
    Sash window mechanismsFrom £75/window

    All prices are indicative and subject to site survey. We provide detailed written quotes with no hidden costs after assessing your specific requirements.

    Why Our Pricing Represents Great Value

    Up to 25 Years

    Industry-leading warranty on premium installations

    Survey-led

    Thermal savings depend on the property and energy use

    Varies

    Payback period depends on the property and energy usage

    Get Your Free, No-Obligation Quote

    Every quote includes a free on-site survey, detailed specification, and transparent pricing with no hidden costs.

    Call 0207 060 1572Request Quote Online

    Match your budget to the right specification

    Pricing only makes sense once you've matched it to the noise problem, frame style and heritage rules at your property. These guides explain what you're actually paying for and where to spend or save.

    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. 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.

    3. Greater London Authority (2021). The London Plan 2021, Policy D14: Noise. Mayor of London.Open source

      The London planning policy on reducing, managing and mitigating noise in homes across the capital.

    4. 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.

    5. 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.

    Understanding secondary glazing costs

    Why prices vary between windows

    Secondary glazing is made to measure, so no two quotes are identical. A small casement with clear glass costs far less than a tall sash bay with acoustic laminated glass. Prices on our quote page start from £450 per window, with final figures confirmed after a free survey.

    • Glass: clear float, laminated or acoustic laminated.
    • Size and number of opening panels.
    • Fitting method and any reveal preparation needed.
    • Listed building or conservation area considerations.

    Value beyond noise reduction

    Secondary glazing also reduces draughts and heat loss, and can help landlords improve EPC ratings without replacing original windows. Use our calculators to estimate noise and energy benefits before you book a survey.

    Noise reduction of up to 54dB is achievable in suitable configurations; actual results depend on the existing window, the surrounding wall and the quality of installation.