Double Glazing vs Triple Glazing

The basic difference between double and triple glazed windows is that the former consists of two panes of glass with a gap in between them and the later is made up of three panes of glass with a gap between each pane. The gaps are often filled with the likes of argon. The effect of these things is that triple glazing provides better insulation in colder weather. In fact, the u-Value of triple glazed units is a maximum of 0.8W/m2K having also insulated the frames as well. The sound insulation with triple glazing is superior to that of double-glazing so you would notice the difference if you owned a property that was built by a traffic congested A road.

Of course, the increase insulation efficiency of triple glazing comes at a price as you may pay in the region of 30% to 50% more than for double glazing so it would obviously take much longer to recoup the capital expenditure by lower fuel bills.

Choosing a company

As we said earlier, there are many companies that manufacture, supply and install double glazed units but a lesser number that do triple glazed units. There are a number of ways that you can find a suitable company with one being by way of recommendation from friends or family. Consider selecting one that is registered with FENSA – Fenestration Self Assessment Scheme as those installers are able to self certify that the work carried out meets Building Regulations so you will not then need to let the local council know.

The company will arrange for a member of their staff to visit you to discuss your requirements, measure up and provide a quote. You should consider getting quotes from at least three companies.

Selecting windows and doors

You should choose a material and style for your windows and doors that are in keeping with the external appearance of your property.

The main materials available are - uPVC, wood (hardwood or softwood), composite and metal. The most popular choice is uPVC that you may find, on average overall, is the least expensive option. A major benefit of uPVC is that it is easy to maintain as it only requires wiping over periodically and it is resistant to the harsh weather that we encounter in The British Isles such as rain, frost and snow. Wooden window frames / doors require regular maintenance such as painting or staining to protect them against the elements. As with most things in life, there are a range of qualities when it comes to the materials - the better the quality, the more expensive it will be.

There are a range of window styles - casement, tilt and sash. The casement windows are the most popular. They open out and can be made up of a full glass panel or in other designs such as Georgian that consists of small glazed units. The tilt and turn window looks particularly appealing on modern properties and is easy to clean. The sash window is often seen on Victorian and Georgian properties with the bottom half of the window sliding upwards. All the windows should provide adequate ventilation. You will also need to decide upon the colour of the window frames.

There is a huge range of doors to choose from - standard, French, patio and bi-folding that all come in different styles and colours. They should be in keeping with the outside appearance of your home. Your front door could include some double or triple glazing panels to allow extra light into the hall.

Most people will choose to have their old window frames and glass removed and replaced with factory manufactured, sealed double or triple glazed units. However, if you have an old listed building that has hardwood frames in a satisfactory condition, you could just replace the single-pane glass with double or triple glazing subject to listed building consent.


The installation time will vary depending upon the amount of work involved ranging from a couple of days to a week or so. You will find that there will be very little disturbance and you will not need to redecorate afterwards.


There are various ways that you can fund the purchase and installation costs. For instance, you may be in a position to pay for them from savings or you could arrange a personal loan with your bank or take out a further advance with your mortgage company.

We do hope that you have found this guide to buying double and triple glazing informative.

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