COST GUIDES
How much does Velux window repair cost?
Updated 07/26
Velux window repairs are open to wide pricing structures, depending on what’s gone wrong. Seal replacements sit at the cheaper end; replacing flashing, mechanisms, or glass costs more.
Fast Facts
For Velux, it is best to contact a specialist
Average repair cost: £165 - £1,050
Seal replacement cost: £65 - £150
Full replacement cost: £1,000 - £2,500
This guide breaks down the prices for each repair type so you know what to expect before you call a tradesperson.
Velux window repair cost
Whether it's leaking seals or cracked glass, fix a damaged Velux window quickly. Here’s what you can expect to pay for Velux window repair in the UK.
| Cost provided item | Average cost |
|---|---|
| Average Repair costs | £165 - £1,050 |
| Flashing or frame repair/ replacement | £180 - £500 |
| Replacement mechanisms | £100 - £500 |
| Seal replacement | £65 - £150 |
| Cost to remove and replace | £1,000 - £2,500 |
| Last updated: July 2026 Our costs are ballpark averages - get a local tradesperson to quote now | |
n.b. These costs are subject to model, size and specification
The average Velux window repair cost falls between £165 - £1,050, depending on the extent of the damage.
For example, if your Velux window is leaking, the cost to replace the seals is typically £65 - £150. If you need to replace the mechanisms, budget around £100 - £500. To repair or replace the flashing or frame, expect to pay £180 - £500.
Other costs to factor in include making good internal finishes or any associated roof repairs.
Data verified by our professional estimators
Estimators are CIOB & RICS members
What affects the cost of Velux window repair?
Several things push the price up or down:
The type of repair
Seal replacement is the cheapest job on the list. Full mechanism replacement or flashing work costs considerably more because it involves more labour and materials.
Window size and model
Larger Velux units need bigger replacement glass panes, which cost more to source. Older discontinued models can be harder to get parts for. It’s also worth getting your Velux windows serviced regularly to catch wear before it becomes a bigger job.
Access
If your window is on a pitched roof at height, the tradesperson may need scaffolding or a cherry picker. That’s an added cost on top of the repair itself. A two-storey semi typically adds [VERIFY: re-check for 2026] per week for scaffold hire.
Where you live
Labour rates in London and the South East tend to run higher than elsewhere in the UK. If you have a non-Velux roof light, compare skylight repair costs as a benchmark.
Age of the window
Velux windows last 20–30 years with decent maintenance. On an older unit, it’s worth asking whether repair or full replacement makes better financial sense (see the section below).
You can also check whether Velux windows need regular servicing to understand what upkeep is worthwhile.
Common Velux window problems and solutions
We dig into some of the most common problems with Velux windows and explore what can be done to fix them.
Velux window replacement cost
In some cases, the damage may be great enough that it’s more cost-effective to get a new Velux altogether. A full supply-and-fit replacement of a like-for-like unit typically costs around £1,000 - £2,500.
That price assumes the new window is the same model and size. Switching to a different model or upgrading the specification will push costs higher. Bear in mind that these costs assume no access equipment, such as scaffolding, is necessary.
The cost of hiring scaffolding depends on the height, length, and duration of hire. For a 2-storey semi-detached house, scaffolding hire costs around £875 per week.
We recommend getting multiple quotes so you can compare prices before committing.
Velux window glass replacement cost
Glass replacement makes sense when:
The frame and mechanisms are in good condition
Only the glazing has failed (blown unit, crack, or scratch)
If your window is older and the frame has deteriorated too, a full replacement often works out better value.
Types of glass available include standard double-glazed, acoustic, laminated, and solar control. Your tradesperson can advise which is most suitable for your roof position and needs.
If you’re unsure whether a crack means you need replacement, read our guide on what to do with a cracked Velux window.
Why is my Velux window leaking and what can I do about it?
Is your Velux window leaking? This isn’t something you should ignore. Here’s why it might be happening and what you can do to solve the issue.
Repair or replace? When to make the call
Replacing the glass is nearly always cheaper than swapping the whole window.
But once a Velux unit is over 20 years old, or if the frame has rotted or the mechanism has failed, a full replacement often works out better value in the long run. A good rule of thumb: if the repair cost is more than 50% of a new unit’s price, get quotes for replacement too.
If you’re weighing up a full replacement against other roof work, it may be worth checking the cost of installing a new skylight or even loft conversion costs if you’re planning a larger project.
What is the lifespan of a Velux window?
A well-maintained Velux window typically lasts 20–30 years. The glass unit and seals are the parts most likely to need attention first. Seals can degrade in 10–15 years in exposed positions, while the frame itself (if timber) benefits from regular painting or treatment to stay weathertight.
Keeping up with maintenance is the best way to extend the life of your window and avoid larger repair bills down the line.
Can you repair a Velux window yourself?
Some minor maintenance is within DIY range, such as lubricating hinges and cleaning seals. But glass replacement or flashing work should always go to a professional.
Incorrect installation voids the guarantee and can lead to leaks or structural damage.
Do roofers replace Velux windows?
Yes. A qualified roofer or specialist Velux window fitter can replace or repair a Velux roof window.
For glass replacement only, a window fitter is often the right person. For anything involving the flashing or the roof structure around the window, a roofer is better placed. Either way, always use a checked tradesperson who can show relevant experience.
We check the reviews on Checkatrade are from real people, and that trades meet our high standards.
Velux window repair cost: job estimator tool
Want some help with your budgeting? Our dedicated pricing tool can help.
Based on real job data from our tradespeople, the calculator can help you out with a few pieces of key information about the Velux window repair job you have in mind.
Job Estimate Calculator
Benefits of using a checked Velux tradesperson
Velux roof windows are directly exposed to the elements. Any repair that isn’t watertight will let water in, often without you noticing until there’s damage to the ceiling or structure below.
Using a checked tradesperson means the work is done right first time, and if something does go wrong, you have somewhere to turn.
Checkatrade tradespeople are checked, verified and approved before they join our directory. All of them meet our quality standards.
Find a roofer or window fitter covering your area
Find checked and reviewed tradespeople
Not sure about the different sizes of Velux windows? Or looking for alternatives? At Checkatrade, you also can find checked Velux window repair specialists near you.
How to find a Velux window repair specialist
Finding a Velux window repair specialist is easy with Checkatrade.
We check, verify and approve all of our members. All of the tradespeople in our directory meet our high quality standards.
Use our quick and easy request a quote feature and we’ll get experienced local roofers and window fitters to contact you directly. To get accurate quotes, be as detailed as you can:
The type of repair needed (seal, glass, flashing, mechanism)
The size of your Velux window if you know it (e.g. CK04, MK06)
Whether scaffolding or roof access will be required
How old the window is
Any photos of the damage
On Checkatrade, you'll only find trades who meet our high standards and pass up to 12 checks.
Velux window repair cost checklist
Velux window repair cost checklist
Before contacting a tradesperson, here's what to check:
Velux window repair cost FAQs
Yes. Velux windows can be repaired in most cases. Common repairs include replacing seals and ventilation filters, oiling hinges and mechanisms, reglazing cracked glass, fixing remote controls and electrics, and repairing or replacing flashing. A checked Velux specialist can diagnose what's needed and advise whether repair or replacement is the better option. Find a Velux window service engineer in your area who can diagnose and fix any repairs.
Yes, and it's often the most cost-effective fix for a leaking Velux window. Velux flashing kits are designed to integrate the window into the roofing material and make it weathertight. Unless you have solid roofing experience, leave this one to a professional. A poor flashing job is the most common cause of Velux leaks.
The most common causes are: flashing installed incorrectly or deteriorated over time, damage to the roofing felt around the window, a broken or worn closing mechanism leaving a gap, debris accumulating over the flashing, and damaged or worn sealant. A Velux specialist can diagnose the cause and quote for the right fix.
The cost depends on what's wrong. Seal replacement starts from around £65–£150. Flashing repair or replacement usually costs £180–£500. If the whole unit needs replacing, you'll probably need to budget £1,000–£2,500 to allow for both labour and materials.
A Velux window typically lasts 20–30 years with proper maintenance. Seals and the glass unit are usually the first things to need attention, often after 10–15 years in exposed positions.
Yes. A qualified roofer or specialist window fitter can replace or repair a Velux roof window. For glass-only replacement, a window fitter is usually the right tradesperson. For anything involving the flashing or surrounding roof structure, choose a roofer with Velux experience.
Velux glass can crack from impact (falling debris, hail), thermal stress on older units, or a manufacturing fault in the glazing unit. If the crack is in the outer pane only, the window is still weatherproof short-term but should be replaced promptly. A crack through the inner pane means the unit has failed and needs immediate attention.
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