How Much Do Double Glazed Windows Really Save You On Energy Bills
How Much Do Double Glazed Windows Really Save You On Energy Bills?
For homeowners, one of the most effective yet underestimated investments you can make is upgrading your windows. In particular, replacing single-glazed windows with high-quality double glazing can bring noticeable energy savings. Let us take a closer look at what the numbers say.
The Cost of Heat Loss And Why Double Glazing Helps
Approximately 18% of heat loss in typical UK homes occurs through windows. In some older properties, that figure rises even further to between 18% and 25%. That makes windows a significant factor when it comes to rising energy bills.
Single-glazed windows lose heat around twice as quickly as standard double-glazed units Double-glazed windows usually feature two glass panes separated by a gap filled with argon gas or air, which creates a thermal barrier that helps retain heat inside your home.
Estimates of Annual Savings
Let us explore typical annual energy savings based on roof type of property:
- Semi-detached houses (A-rated double glazing): Energy Saving Trust estimates suggest savings of up to £140 per year when upgrading from single glazing.
- Semi-detached homes (A-rated/A++ glazing): The Energy Savings Trust further supports annual savings between £175 and £235 for upgraded glazing.
- Detached homes: Savings can reach up to £235 a year.
- Mid-terrace, bungalow, flat: Typical estimates suggest savings of around £125, £100, and £95 per year respectively.
- Typical range: Several sources report annual savings of £105 to £155.
Savings could be as much as £395 a year with today’s standards of double glazing.
Broader Impact and Wider Context
Homes with full double glazing have increased significantly, from 79% in 2012 to 88% in 2022 in England. This widespread adoption reflects both the popularity of double glazing and its contribution to home energy efficiency.
Moreover, research shows double glazing reduces heat loss by up to 60% compared to single glazing, also reducing around 405 kg of household CO₂ emissions annually.
A local London case study underscores the impact of retrofits: combining loft insulation, double glazing and LED lighting can save around 9 MWh of energy, 1,700 kgCO₂, and over £800 on annual energy bills. Though this figure reflects multiple interventions, double glazing forms an important part of that benefit.
How Your Savings May Vary
Other Double Glazing Benefits
Double glazing windows offer more than just energy savings:
- Noise reduction, creating a quieter home environment.
- Improved security, due to the additional pane and modern locking systems.
- Boosted property appeal, as energy efficiency is increasingly valued by prospective buyers.
- Lower carbon footprint, thanks to reduced energy consumption and CO₂ emissions.
Replacing single-glazed windows with high-quality double glazing is one of the most impactful steps you can take to reduce energy bills and improve your home’s comfort. Typical annual savings range from £100 to £235, and in some cases up to £395. You also benefit from quieter interiors, enhanced security and a more energy-efficient home overall. Given the size of the investment relative to these returns, double glazing often pays for itself in the long term, including additional environmental advantages.
Experience The Advantages Of Double Glazing With Advanced Exterior Plastics
Ready to enjoy warmer rooms, lower energy bills and greater comfort? Invest in double glazing from Advanced Exterior Plastics today. Our expert team will guide you to the best energy-efficient solutions customised for your home. Get in touch now via our contact form for a no-obligation quote and take the essential step towards a smarter, cosier home.