The Cost of Installing New Triple Glazed Windows

All you need to know about installing new triple glazed windows including costs of materials, labour and time frames.

Triple Glazed Windows

What the job entails

Triple glazing is simply using 3 panes of glass instead of the more common 2 panes in doors and windows. This extra pane of glass offers increased energy efficiency and noise reduction. Fitting triple glazing will reduce energy bills whilst making your home warmer and quieter, so it's no surprise that many are considering fitting triple glazed windows. But there is a trade off for this increased efficiency, as triple glazing is of course more expensive than double glazing. This article will identify key points to consider when fitting triple glazing, along with typical costs and information on what to expect when having triple glazed windows fitted.

The process of removing window frames and sills can be very damaging to the decoration and plaster. Though most glazing companies will attend to any re-plastering that is required, all painting and wallpapering required after the job is down to the homeowner. If getting an entire house fitted with triple glazing, the decoration will add up to a substantial amount of work and if you are not planning on decorating yourself, you should add decorating costs as part of the budget. You may also want to consider having the fascia and soffit boards replaced or painted at the same time, especially if they are still the original wooden boards. Nice new window frames will make old fascia boards look very grotty and this will have an impact on the overall finish. In addition, many glazing companies also will fit roofline products so you can get both jobs done at the same time by the same company at a reduced cost.

There are cheaper alternatives to triple glazing, adding secondary glazing for example will offer much of the same effects in terms of noise and thermal insulation. Secondary glazing is effectively installing an additional internal window on the inside of an existing window. Secondary glazing is much cheaper than double or triple glazing and you can buy DIY kits and do it yourself, whereas fitting triple glazing windows will need a professional as they have to be built to order and installed by experienced fitters, certainly not a DIY project. In addition, triple glazing is more effective at increasing the energy efficiency of your home when compared to secondary glazing at stopping the heat escaping. But secondary glazing will offer a better level of acoustic insulation, as the greater the cavity between the panes, the better the sound dampening. So if noise reduction is a critical factor, secondary glazing may be the better option (but installing secondary glazing and triple glazing will be an even better option). Secondary glazing also does not effect the external appearance and is also considered a reversible change, so is suitable for use in conservation areas.

Triple glazing is still much less popular in the UK compared to Scandinavian countries, their colder climates demand seriously effective insulation against heat loss. Double glazing and triple glazing both work on the same principles, trapping an an insulating gas layer between panes of glass, adding a third layer with triple glazing simply increases the insulating properties of the window. However, the most common triple glazing frame material, UPVC, is a poor insulator, so to make the biggest energy savings possible with triple glazing, you should consider opting for timber framed glazing units.

The removal of old window frames can often mean internal and external plaster damage, however, re-plastering is expected and usually included in any quotations. Occasionally, the removal of old windows can also reveal damp problems which will need further investigation and will definitely not be included in typical quotations received for glazing. But in general, there is little of consequence to go wrong with fitting triple glazed windows, the main potential problems being persistent leaks and condensation due to poor installation/sealing.

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The Cost to Install Triple Glazed Windows

To find typical prices for triple glazed windows, we surveyed many UK double glazing companies and asked many of them to quote us. We also checked out prices from local joiners to supply and fit triple glazing along with the larger companies to get a good idea of the price ranges. Our team gathered theses prices so that you can easily see the average cost of an installation when making plans.

Material costs to install triple glazed windows will ultimately depend on the quality of glass, frames used and the number of windows that are installed.

On average, the labour costs to fit triple glazed windows will be around £150 to £200 per day. Typically, labour will be factored into the overall quotation given by the tradesperson. To install triple glazing labourers will often work in pairs to get the job done quickly and hassle free.

Below are some estimated costs of hiring a window specialist to fit triple glazed windows:

Job Description Avg. Cost Duration
Two bedroom flat 4 triple glazing to windows £1,950 1-2 days
Two bedroom terraced house – 5 windows triple glazing £2,500 1-2 days
Semi-detached house triple glazing to 7 windows £4,000 1-2 days
Detached house 12 triple glazed windows £6,000 2-3 days
Detached house 15 triple glazed windows £7,000 2-3 days

Cost Breakdown

Individual costs to install 7 triple glazed windows on a semi-detached house - Total Cost: £4000






Waste Removal


Triple Glazing is the glazing process in whereby a window is made with three panes of glass formed into one single unit to offer high thermal efficiency. Triple glazing offers superior noise reduction compared to standard double glazing, in addition to better thermal performance, giving you a warmer and quieter home.
Triple glazed units are available in UPVC, Aluminium and timber frames.
If you are planning any home improvement it is always a good idea to contact your local authority to check whether you require planning permission. However, you shouldn’t need planning permission for fitting triple glazed windows as this is likely to have little to no impact on your neighbours and the neighbourhood. But there are exceptions - such as if your house is a listed building or in a conservation area. So always check with your local authority as this is your responsibility, if there are any issues at a later date it will be the homeowner that has to put things right - not the window fitters!