Is Upgrading to Double Glazing Worth It? A Guide to Costs, Savings, and Benefits

Double glazing has become a popular home improvement in the UK, especially as energy bills rise and homeowners seek ways to improve efficiency. Double glazing offers enhanced insulation, noise reduction, and can improve the overall look and feel of your home. But how much can you really save by upgrading, and is it worth the initial cost? This guide will walk you through everything you need to know about double glazing, from potential savings to average costs and installation considerations.

What is Double Glazing?

Double glazing consists of two glass panes separated by a small air or gas-filled gap. This gap acts as an insulator, reducing heat loss through the window and helping to keep your home warmer in winter and cooler in summer. By slowing down the transfer of heat, double glazing makes your home more energy-efficient, which can reduce heating bills and improve indoor comfort.

How Much Can You Save with Double Glazing?

Upgrading to double glazing can lead to significant energy savings, especially in older homes with single-pane windows. Here’s a breakdown of potential annual savings based on property size and energy usage:

  1. Detached House: £120 – £155 per year
  2. Semi-Detached House: £90 – £110 per year
  3. Terraced House: £60 – £80 per year
  4. Flat or Apartment: £45 – £65 per year

These figures can vary depending on the type of glass, frame material, and how well-insulated your property is overall. While the energy savings may seem modest on their own, they can add up over the years, making double glazing a smart long-term investment. Furthermore, double glazing enhances comfort by reducing drafts and cold spots, which can improve your overall experience in the home.

Note: The savings above are for upgrading from single glazing to double glazing. If you’re upgrading from older or less efficient double glazing, the savings may be lower but still worthwhile in terms of improved insulation and comfort.

Average Costs of Double Glazing

The cost of double glazing depends on factors like the type of windows, frame materials, and the size of your home. Here’s a general breakdown of what you can expect to pay:

  1. Casement Windows (most common style)
    • Single Casement Window: £300 – £500 per window
    • 3-Bedroom Semi-Detached House (8-10 Windows): £3,000 – £5,000
  2. Sash Windows
    • Single Sash Window: £500 – £700 per window
    • 3-Bedroom Semi-Detached House (8-10 Windows): £4,000 – £7,000
  3. Bay Windows
    • Single Bay Window: £1,000 – £1,800
    • 3-Bedroom Semi-Detached House with Bay Windows: £6,000 – £9,000
  4. Tilt and Turn Windows
    • Single Tilt and Turn Window: £400 – £600
    • 3-Bedroom Semi-Detached House: £3,200 – £5,500

Frame Materials can also impact the cost:

  • uPVC: £250 – £400 per window, the most affordable and widely used option.
  • Wood: £600 – £900 per window, ideal for older homes with traditional aesthetics.
  • Aluminium: £500 – £700 per window, durable and low-maintenance with a sleek, modern look.

These prices are averages and can vary based on the supplier, region, and any additional features like security glass or soundproofing.

Upgrading Older Double Glazing: Is it Worth It?

If your home already has double glazing but it’s older (installed over 15-20 years ago), you may still benefit from upgrading. Modern double glazing is significantly more energy-efficient than earlier versions, thanks to advancements in glass technology and frame materials.

  1. Increased Energy Efficiency: Newer double-glazed windows often include low-emissivity (Low-E) coatings, argon gas between panes, and better seals, which can improve thermal efficiency by up to 20% compared to older models.
  2. Improved Comfort and Reduced Draughts: Old double glazing can degrade over time, leading to condensation between panes, draughts, and reduced insulation. Upgrading to modern windows can eliminate these issues and improve overall comfort.
  3. Potential Resale Value Boost: Upgrading old double glazing can increase the value of your home, as potential buyers are often drawn to energy-efficient properties with modern amenities.

While the annual savings may not be as high as going from single to double glazing, upgrading old double glazing can still make a significant difference in comfort and curb appeal.

Additional Benefits of Double Glazing

  1. Noise Reduction: Double glazing is excellent for reducing noise pollution, making it ideal for homes in busy or urban areas. Upgrading from single glazing to double glazing can cut down outside noise by up to 50%, creating a quieter indoor environment.
  2. Reduced Condensation: Double glazing helps reduce condensation buildup on windows, which can be especially beneficial in colder months when condensation is more likely to form. This can help prevent dampness and mold growth around windows.
  3. Increased Security: Modern double-glazed windows are typically more secure than single glazing, as they are built with tougher glass and better locks, helping to enhance home security.
  4. Lower Carbon Footprint: By reducing energy consumption, double glazing helps lower your home’s carbon footprint, contributing to a more sustainable lifestyle.

Government Schemes and Financing Options

To encourage energy efficiency, there are government grants and financing options that can help with the cost of double glazing:

  1. Energy Company Obligation (ECO): This scheme requires major energy companies to provide funding for energy-saving home improvements, including double glazing, to eligible low-income households. Check with your local council or energy provider to see if you qualify.
  2. Green Homes Grant (if reintroduced): Although currently closed, the UK government has previously offered grants for home energy improvements like double glazing, and similar incentives may return. It’s worth staying updated on any new grants.
  3. Interest-Free Loans: Some regions in the UK, such as Scotland, offer interest-free loans for energy-efficient upgrades, including double glazing. Check with local authorities for available programs.

Tips for Choosing the Right Double Glazing

  1. Choose a Reputable Installer: Ensure you select a certified installer to guarantee quality and performance. Look for FENSA or CERTASS accreditation to ensure compliance with building regulations.
  2. Compare Quotes: Get at least three quotes to compare prices and services, as costs can vary significantly between providers.
  3. Consider Low-E Glass: This type of glass includes a coating that reflects heat back into your home, increasing energy efficiency.
  4. Frame Material: Choose a frame that suits your home’s aesthetic and maintenance preferences, whether uPVC, wood, or aluminium.

Conclusion: Is Double Glazing Worth the Investment?

Double glazing offers considerable benefits for homeowners, including reduced energy bills, improved comfort, noise reduction, and enhanced security. For those upgrading from single glazing, the energy savings and comfort improvements are substantial, especially in older homes. Even for homeowners with older double glazing, an upgrade to modern double glazing can be worthwhile in terms of energy efficiency, comfort, and potential value increase for the home.

By choosing the right type of windows, understanding the costs and savings involved, and exploring available grants and financing, homeowners can make an informed decision about double glazing. It’s an investment that pays off over time, creating a more comfortable, energy-efficient, and valuable home.