Everything You Need to Know About Double Glazing

In this article we talk about what exactly double glazing is and how much it costs.

For most households, installing double glazing would mean enjoying reduced energy bills and having a warmer home. The problem is that double glazing can be expensive, so you should ensure you’re making the right decision. Here’s everything you need to know about double glazing to help you make that choice.

Is Double Glazing Effective?

Double glazing windows are made from two panes of glass separated by air or gas. It offers several benefits over single-glazing, which involves only one layer of glass;

  1. Keeps the warm air in to better insulate your home, leading to reduced energy bills and less draughts
  2. Keeps noise out – you should hear less outside noise with double glazing
  3. Reduces how much condensation gathers on windows
  4. Boosted security – double glazing is more durable than single glazing and harder to break

Double glazing is more efficient with a gas such as argon between the panes and is made from low-emissivity gas (Low-E), which has a reflective coating for keeping sunlight in a home.

What are the Benefits of Triple Glazing?

As the name implies, triple glazing uses a third pane of glass. It should improve the sound proofing and house warming qualities of double glazing. Some companies will use different kinds of gas between the panes and Low-E glass to further boost the benefits.

Triple glazing does come with a higher price tag though. If you are interested in triple glazing but can’t afford to have it done to every window in your home, focus on the rooms that are the coldest or get the most external noise.


Street With Bay Window Installations

Street With Bay Window Installations.


What is Secondary Glazing?

Secondary glazing is when a second pane is attached to existing windows. Secondary glazing isn’t as effective as actual double glazing, but it may still save some money on energy bills and it is far cheaper to install. It makes for a good alternative for homes that aren’t able to install double glazing, such as for those living in listed buildings.

How Much Does Double Glazing Cost?

The cost of double glazing can vary. In general, expect to spend between £515 for a single 60x90cm uPVC casement window to upwards of £3,000 for a 180x150cm double-hung sash windows. There are several factors that go into determining the cost of double glazing, including;

  • The kind of glazing
  • The material
  • The number of windows


View of a Beautiful House and Front Door on a London Street with Sash Windows.

View of a Beautiful House and Front Door on a London Street with Sash Windows.


Does Double Glazing Reduce Energy Bills?

Two-thirds of homeowners report their homes are warmer after installing double glazing. A warmer home is the main difference that people believed it made. However, only around 35% of homeowners reported that this led to a reduction in energy bills.

The Energy Savings Trust suggest that if every window in a house was replaced with a A++ double glazed window it would reduce energy bills by between £110 and £115 a year. For mid-terraced homes attached to another property on both ends, which would lead to a reduction in heat loss, the saving is around £60.

How Often Should Double Glazing be Replaced?

Most people say that the reason they got double glazing was to replace the ones they already had. If you aren’t sure if it’s time to replace your windows, here are some signs to watch out for:

  • Draughts
  • They let water leak through
  • They let too much noise in
  • They are visibly damaged
  • The uPVC has yellowed or the timber has cracked
  • They are difficult to open and close
  • They are covered in condensation

It may be possible to repair the window without having to replace it. Discuss your options with an expert. Just keep in mind that a company may be unwilling to repair double glazing windows that they did not install themselves.

Recommended Double Glazing Installers in Birmingham

Complete Glazing Birmingham specialise in the supply and installation of double glazing and a variety of different windows and conservatories. As a company they are committed to providing value driven prices for glazing services in Birmingham.

Business Address

BB Block Paving Driveways Birmingham
Unit 121, 180 Sherlock St, Birmingham, B5 7EH, United Kingdom
0121 405 9812
M-F: 7:30am – 6pm, S-S, 7:30am – 6:30pm



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