Cost of Fitting New Windows

By Kane
Last updated 15th May 2024 - Reading time: 8 mins
At a glance
  • The average cost of fitting new windows is around £3,750
  • The job will take approximately 1 day to complete
In this article, you'll discover the following:
  • A complete pricing breakdown which includes things you need to consider, along with what such a task usually involves
  • How long the job should approximately take and a general overview of what types of services can be performed
  • How to find and hire a window fitter

Do you want to know the cost of replacement windows?

New window installation will cost you around £3,750 on average.

Just need a quote?

We have a range of local window fitters ready to offer you a free quote!

This price guide offers everything you need to know about window fitting, including costs of materials and labour, as well as some DIY tips.

bay window on house

The average cost of fitting a home with new windows:

The time it takes for 2 window fitters to install new windows on the average house is around 2-3 hours each


How Much Does It Cost to Install New Windows?

Fitting a new set of windows has a number of positives, and is something every homeowner should consider doing at some point.

Most people often change their windows as it is a perfect way to help save and cut down on energy and heating costs. Most new fittings use a material called uPVC, which helps with insulation and keeping the heat in your home.

uPVC is a low cost, plastic like material that is durable and low maintenance, which is why it has become the most common material for window frames - especially in new build homes. Installing a new set of windows will also give your home added security, due to uPVC having resilience and strength properties.

It's low maintenance and durability will mean that your window frames will last a good number of years, unlike more traditional materials such as timber, which can rot over time or deteriorate due to weather damage.

The cost of this job can vary due to the number of windows you want fitting, of course, this would also depend on the size of your house. The cost of fitting new windows will also depend on the size of the window, the type of window you want to replace and the type you want to replace it with.

As a DIY project, fitting new windows is certainly doable for well experienced DIY enthusiasts. However, we would recommend hiring a professional to carry out this job for you.

The risk factor is just to high if anything were to go wrong, leaving you with a pretty expensive problem. Fill in your details on myjobquote and receive quotes three local window fitting specialists, leaving you with piece of mind.

If accurate measurements are taken where old windows were, then would the new windows be free of silicon fillers?

"Hi even if you got new window sizes perfect you would still need a mastic ( silicone) seal to make windows water tight"

New Window Installation Prices

Job Description Duration Material Cost Labour Cost
4 Casement Windows Terraced Home 1 Day £2,000 £175
3 Bed Semi-Detatched Home (8 Windows) 1 Day £3,500 £250
4 Bed Detatched Home (12-15 windows) 1.5 Days £5,000 £400
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Things to Consider When Fitting New Windows

When planning on installing new windows there will always be things you will need to check off first, and to make sure you do a bit of homework. As with any home improvement plan, it is always a good idea to understand what the job entails, and what your options are when planning.

Before fitting your windows, you will need to identify what type of windows you want for your home. A new set of modern windows will add to the overall look of your house, as well as increasing property value if you wish to sell in the future.

A new set of uPVC windows could also last you 20 years, so make sure to choose a style of window you are certain you will be happy with in the long run – saving you the cost of changing them in the near future.

One of the most common type of windows, is the uPVC casement window. The hinges of the casement window sit on the side, and by turning a lever either located on the side of the sash, or at the bottom of the frame, the window swings outwards.

And as mentioned before, uPVC frames are durable, easy to maintain stylish and low cost – making them so common in new fittings and new builds. Because of it’s plastic-like look, some people look for something a bit more stylish and can be put off uPVC frames.

However, modern uPVC does come in a range of colours and finishes, so if you are looking for that timber look without the hassle of having wooden frames, then uPVC is perfect for you.

Essentially, you will need to do a bit of ‘window shopping’ before you decide on what you want fitted in your home, as getting the right windows will make all the difference in the future.

One important factor you need to be aware of before fitting new windows, is that you will need to get your new windows certified so that they meet new building regulations.

When having new windows fitted, you will have to contact the building control at your local council to inform them of this. They will then arrange to come out and complete an inspection, however this can come at a cost which can vary depending on where you live.

You can also avoid an inspection by hiring a window fitting specialist who is FENSA certified. He will be able to self-certify the new fittings, and provide you with the certificate. So, when hiring a tradesman be sure to ask whether they are FENSA registered.

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Doing it Yourself

For any enthusiastic and experienced DIY person fitting a new window could be a very rewarding challenge, especially if you are looking for a new project and want to put some new skills to practice.

However, we would recommend hiring a specialist window fitter on this occasion, because of the complications that can occur when fitting a new window.

One way you can get involved, that could also save you a bit on costs, is the removal of the old window and frame. You can start this by removing any opening windows by unscrewing them at the hinges.

Be sure to remove carefully, and to ask for help when lifting the window out of the frame. You will then need to remove any non-opening or fixed window panes. You will now need to remove the frame, starting with central uprights and then the outer main frame.

A tip on doing this is to saw through the frame at an angle all the way to the wall, but making sure not to cause any damage.

Then by using a hammer and chisel, you can begin to remove the rest of the framework, and levering off any awkward parts using a wrecking bar.

Be sure to clear away any debris whilst working so not cause any injuries or damage, and to dispose of the old window, including glass panes and frames, responsibly.

By doing this part of the job yourself, you have saved on the time, effort and cost of your hired tradesman doing it.

Checklist for Fitting New Windows

  • Look out for FENSA registered specialists
  • Check for accredited double glazing specialists
  • Apply to your local council's building control for FENSA certification
  • Choose the appropriate materials - uPVC is most popular for energy efficiency, safety and durability
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What is the best material for a window frame?

The most common and widely used material for window frames is uPVC. It is a plastic-like material, chosen for it's durability, low maintenance and low cost compared to other materials such as hardwood and aluminium. A uPVC casement window also has high energy efficiency, saving you money in heating bills.

Do you need building regulations for new windows?

Yes, when fitting new windows you will need to inform the building control at your local council so that you can obtain a certificate claiming they meet regulations.

You can also go about this by hiring a window fitting specialist who is registered with FENSA, he will be able to self-certify and provide you with the certificate once the job is complete.

How long does it take to fit new windows?

For a hired specialist on a standard small to medium sized house with 6-10 windows, the job should take one full day to complete. For a DIY job, it will probably take a bit longer to complete, say 2-3 days, especially if you were to hit any complications.
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