A Look at Roof Windows and How Much They Cost to Replace

Are you researching prices to replace a roof window? We know how much tradespeople, roofers and companies are charging for this type of work, so we believe we can help you. Check out our price guide in the table further down this page. Hopefully, we can save you money today.

What is Quotation Check? How Accurate Are The Prices on This Site?

Quotation Check is a website created by a small team of people in the UK. Our goal is to shine a light on charges by tradespeople and businesses, so you can avoid rogue traders and unscrupulous businesses. We have been gathering prices and estimates for nearly three years (see our full price list here) and have helped thousands of visitors to this website.

Our prices are a reflection of the prices given to us by real companies operating in the UK. See exactly how we gathered our figures here.

Our service has been cited in several discussions on the Money Saving Expert website. Writers for both Sainsbury’s Finance (website) and Direct Line (blog) have recommended us as a place to get price estimates.

Roof Windows – A Quick Overview

Before we even begin to explain how a roof window is replaced and what costs are involved, we need to cover a few basics:

Velux is not a generic name for a roof window, it’s the name of a company that makes roof windows as well as other related products such as blinds, shutters and sun tunnels. There are many other manufacturers of roof windows which can be used on first-time installations as well as replacements for older roof windows that have failed.

Also of note; there is a big difference between a roof light dome (opening or non-opening) and a Velux-type roof window. Roof domes are usually cheaper, made from plastic and won’t fully open, they are often seen on flat roofs to allow more light into space below. Velux-type roof windows are used on tiled roofs, in most cases where there is no loft space or where the loft has been converted to a habitable space.

Obviously, you will want to make 100% sure your that contractor is installing the exact type of window you want, so be sure you understand the difference between these:

  • A generic roof window
  • A Velux roof window
  • A roof dome
  • Skylight/roof light
  • Light/sun tunnel

There are also different types of opening roof windows, some have the hinge at the top of the frame (top hung), while others have the hinge halfway on the frame (centre pivot):

Roof window in bathroom

Old timber roof window in bathroom, note that the hinge is centred (centre pivot)

For the avoidance of any doubt, this page refers to Velux (opening) roof windows that are used on a pitched and tiled roof. We are assuming you already have a window in the roof and just want it replaced.

If you are looking to install a roof window for the very first time then it will cost more, as timbers will need to be cut and possibly extra supports put in place first. There will also be some additional plastering work with a completely new window install. None of this applies to a like-for-like replacement.

Cost to Replace a Roof Window

We have researched the cost/price that roofers and window fitters are charging customers and have compiled an average cost for three broad regions in the UK.

We are assuming you want a replacement Velux window and your installer will include all the necessary extras such as flashing trims and insulation.

Job Cost 1 – Dimensions 66cm x 98cm (small roof window)

This is quite a small roof window, similar to what you might typically find in a bathroom. The replacement will be made by Velux, constructed from pine and painted white with laminated glass. The opener is manual with a centre pivot and the quote includes all the essential extras, such as flashing kit, collar and insulation. Waste material, including the old window, will be disposed of by the contractor.

LocationSmall Business /TraderLarger Business (5+ employees)
Need a Custom Price? >Compare Up To 3 Personlised Quotes Here
London Area£850.00£1000.00
South, SW and Midlands£700.00£900.00
Outer Region and North£700.00£850.00



Job Cost 2 -Dimensions  134cm x 160cm (larger roof window)

This quote is for a larger window, this time 134cm x 160cm, again the frame is made from pine, painted white and with laminated glass panels. Again, the opener is manual with a centred pivot. The cost again includes the flashing kit/collars and some insulation. The contractor will also dispose of any waste.

LocationSmall Business /TraderLarger Business (5+ employees)
Need a Custom Price? >Compare Up To 3 Personlised Quotes Here
London Area£1350.00£1400.00
South, SW and Midlands£1250.00£1350.00
Outer Region and North£1250.00£1250.00

Arrange Your Personalised Roof Window Quote Today

While many people find our price guides useful, they aren’t as reliable as a firm quote from a local tradesperson. If that’s what you need, then fill out the form below and start comparing quotes:

  • Send in details about your roof window project
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When Were These Prices Last Updated?

We know that old and outdated prices can be frustrating and is the main reason why we intend to update all of our prices at least once every two years.

The prices on this page we last updated on the .

Flashing Kits

Whether you are looking to replace the entire unit or just the flashing (perhaps because it’s leaking?) you will need to make sure you choose the correct flashing kit which will depend on the type of tiles you have on the roof, more specifically how deep profiled the tiles are and also how steep pitched your roof is.

There are dozens of different flashing kits available for Velux roof windows, for example for slate, for flat roof tiles, for profiles roof tiles and for houses where the windows need to be recessed.

Roof Window Ventilation

Ventilation is important, especially on bathroom windows where moisture and condensation can build up. Velux and many other window manufacturers now produce roof windows with variable ventilation settings:

  1. Locked – the window is fully closed and locked, no ventilation
  2. The window bar is open and vented but the window is still locked and secure, it cannot be fully opened from the outside
  3. Open – The window is fully open and vented but not secured

The roof window vent also contains an insect filter mesh.

Optional Extras

Not included in our cost examples above are the following extras:

  • Scaffold costs – this shouldn’t be a problem as the windows can be removed/installed from the inside but if there s an issue with the tiles or felt around the window then access from the roof may be required although this is rare.
  • Vapour barrier – this is usually installed around all windows when they first installed. If your existing roof window doesn’t have a vapour barrier then extra work will be needed to install one around the edge of the window frame. This barrier prevents internal condensation.
  • Security glass – this reinforced glass is available for the more security conscious homeowner.
  • Electric openers – makes opening the window a doddle.
  • Opening rod – to reach windows that are high up.
  • A selection of visually appealing shutters and blinds for your roof window.
  • You can install a Velux window that has a sensor and will close automatically when it rains.
barrier tape for roof window

Vapour barrier for for window

Saving Money

You can save money by:

  • Using a cheaper alternative, Velux is the most popular but is also the most expensive product.
  • Repairing rather than replacing your existing roof window, misting/condensation can usually be fixed by replacing the panes or glass and seals. Roof leaks are usually fixed by checking the tiles around the window or replacing the flashing kit.

Before You Consider a Replacement

Are you looking to replace the entire unit because it’s leaking? Or perhaps because the glass is misting with condensation?

You should know that it is possible to replace just the glass or the flashing (trim) around the exterior of the unit. These parts are available for old Velux windows, you just need the part/serial number that is stamped on the frame of the original window.

How Trustworthy are Roofers in the UK?

Trustworthy Tradespeople UKSince we launched this website, over SEVEN THOUSAND visitors have participated in our questionnaire.

Explore the results and cast your own vote. Are roofing contractors seen as trustworthy in the UK?


Keep Costs Down by Choosing Rated People

Studies have shown that you can typically save up to 24% by getting 3 or more quotes for roof repair and maintenance work.

That is just one of many reasons why we have partnered with Rated People, the United Kingdom’s trusted consumer quotation service to supply you with up to 3 written quotes for a new roof window.


Rated People Have Appeared in:

Quote from Rated PeopleWhy We Love Rated People:

  • Only Real Customers Can Leave Reviews (unlike other sites where anyone can)
  • Over 1 million Jobs Posted – By Customers Just Like You
  • Avoid Time Wasters – These Are Genuine Roofers Seeking Work
  • Trusted Service – Rated People Has Been Around for Ten Years
Click Here to Get Your Free Roofing Quote

Not ready to get quotes? See all of our cost guides here

7 Responses to “A Look at Roof Windows and How Much They Cost to Replace”

  1. Patrick BeerSeptember 12, 2015 at 10:27 am #

    There’s some pretty sound advice here which I found very useful. I’ve been quoted £6000 for replacing four roof windows and thought this was pretty extortionate. After reading this I will do some more reasearch!

  2. Ali rajaOctober 8, 2015 at 7:37 am #

    There’s good advice here which I found very useful. Very strong and easier to use than I imagined it would be. Would recommend this product to other people,can you sow me related with it some post, tn i will use this service very well.

  3. Ed SpencerNovember 4, 2015 at 1:28 pm #

    Hi, don’t want to burst anybody’s bubble but I have had quotes from rated people’s paying customers and they have been extortionate…one guy that I actually employed (to do some manual groundwork around my house) told me that the job would take one to two days to complete and hence the hefty labour cost so I agreed his price. He turned up two days later at about 9.30 and was done and dusted and gone by 1.30 not including the hour and a half when he disappeared to get lunch and pick up a replacement flag for the one he had broken….less than two and a half hours of work! I didn’t understand that ground workers were charging out at junior lawyers rates. I have requested quotes from rated people on a number of occasions…and had no responses it now appears that unless the job is over a thousand pounds a pop they are not even interested to turn out to quote or if it is…expect stupid prices.

    • KennyNovember 9, 2015 at 8:18 am #

      I’m a Carpenter living and working in Cornwall, and have never needed, or wanted to be on these ‘rated tradesman’ type sites. My work, all of it, comes from recommendations. Word of mouth is the best, and most trustworthy advertising.
      From chatting to other tradesmen in the builders merchants, the ones who are on those sites get charged a fortune for the job leads, and as such have to pass it on to their customers. They also said it was so easy to get friends or family to write glowing reports, that any half-wit can become a ‘trusted tradesman’
      Make what you will of that.

      • QuotationCheck AdminNovember 9, 2015 at 10:19 am #

        “They also said it was so easy to get friends or family to write glowing reports, that any half-wit can become a ‘trusted tradesman’
        Make what you will of that.”

        Thanks for sharing your thoughts here on the site.

        I hear you. BUT… what you write may be true of Checkatrade, however Rated People only allow reviews from confirmed customers, i.e the ones that posted job details on their site and were matched to a tradesman. That prevents the type of open manipulation of the reviews/ratings seen on Checkatrade. All checkatrade do is email or phone the “customer” asking if they are genuine!

        All costs are passed onto the customer, whether it’s the cost of Yellow Pages adverts or Rated People job leads. I know several tradeseople who are busy most of the year but in winter their work demand dips so they use Rated People just to keep things ticking over.

        Not every business can rely solely on word of mouth, less established traders for example. Or those wanting to expand rapidly, or break into a new area.

        I feel that these types of review sites can be beneficial to both customers and traders. I used RP to find a local electrician recently and his work was very professional, I guess he knew I would be leaving a review and he didn’t want me to ruin his established reputation on that site.

        I don’t think these kind of sites will ever be a true replacement for word of mouth but they are alternative to Yellow Pages/Newspaper adverts which haven’t worked for years (not for me anyway).

  4. KennyNovember 9, 2015 at 11:42 am #

    I didn’t ask the tradesmen I spoke to which sites they were on, so maybe they were using the more dubious ones. If what you say about Rated people is true then, they have my vote, and I apologise to anyone who might have been thinking twice about using them, after what I said.
    I did advertise in the local paper a few years ago, when I thought things were going to slow down, and I did get a couple of small jobs out of it, but I don’t know anybody, trades or customers, who use the yellow pages. Time it was put out to grass, I think.

  5. End Of TenancyJanuary 13, 2016 at 4:44 am #


    I have used rated people for a full loft insulation and decor and the experience was just great. Even though the tradesmen were punctual and knew their stuff, they still left with many paint damages on several walls brining plaster boards and other stuff in the loft. Over-all experience not so bad as it was good value for money.

    Roofing experience through rated people:
    Then hired a roofer for falling slate tiles and it was a complete waste of time (£150 poorer). Paid another roofer £200 and since I see damp (water patches on the wall)

    Electrical experience:
    2 people came to price the job through word of mouth but their cost was 5 times higher than high street shops. Finally found a decent tradesman for £100 from ratedpeople. Good value for money.

    Windows and doors experience:
    The first guy which came to prove the job was a bit arrogant and rude and had no manners, from ratedpeople. The 2nd person turned out to be a gem!

    I think ratedpeople can be a great place for naive customers like me but perhaps it’s important to do your research via multiple resources “word of mouth included”, “checkatrade” “mybuilder” etc in order to find quality skills

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