Replacing a roof window? Don't worry, we'll take care of it
Is your roof window outdated, damaged or is there a draft coming through? Then it is time to replace your roof window. At De Dakvensterinstallateur you are at the right address for a professional and sustainable replacement.



When to replace a VELUX roof window?
An average VELUX roof window lasts for about 20 to 30 years. Over time, the materials can wear out, the glass can fog up or the window can become mechanically defective. Some signs that it is time to replace your VELUX window:
- Draft or water infiltration
- Poorly closing hinges or tilt system
- Condensation between the glass layers
- Outdated appearance or poor insulation
Does your roof window have one of these problems? Contact De Dakvensterinstallateur for a professional and fast solution.
How does replacing a skylight proceed?

Replacing a skylight at De Dakvensterinstallateur is done in a fixed, careful procedure:
- Inspection & advice: We examine the existing roof window and provide advice on a suitable replacement window.
- Measure & quote: We measure everything accurately and provide you with a transparent quote.
- Replacing the window: The old skylight is neatly removed, the roof is prepared and the new skylight is expertly installed.
- Finishing & cleaning up: We ensure a clean finish, any necessary carpentry and leave your home tidy.
You can contact us for replacing your Velux glass, renewing complete window units or even just renovating window mechanisms.
Renewing a VELUX roof window: a smart investment
By renewing your VELUX roof window, you not only improve the appearance of your home, but also its energy efficiency. Modern roof windows are better insulated, safer and more user-friendly. In addition, we can immediately provide options such as sun blinds, electric operation or insect screens.
You can also choose to have your VELUX roof window renovated instead of completely replacing it – ideal if only certain parts, such as the glass or the operating arms, need replacing.
How much does it cost to replace a skylight?
The cost of replacing a roof window can vary depending on various factors, such as the type of roof window, the dimensions and the accessibility of your roof. We always offer a free, customized quote, so that you know exactly what the costs are for your specific situation. At De Dakvensterinstallateur you get a transparent price without surprises.

Replacing a roof window? Choose De Dakvensterinstallateur?
We are the specialist in installing and replacing roof windows and VELUX windows in Belgium. Customers choose us because:
- Certified VELUX roof window installer
- Quickly available for any project, large or small
- Clear communication and transparent prices
- Years of experience with VELUX roof window installation
- Warranty on materials and installation of Velux roof windows
Our mission: to make your home more comfortable with more daylight, better ventilation and a perfectly finished result. Whether you have a small have a skylight installed or a large tilting window, we ensure that it is correct down to the last detail.
Frequently Asked Questions
When should I replace my VELUX roof window?
Your VELUX roof window needs replacing if the window no longer closes properly, causes a draught or if condensation forms between the glass layers. Replacement is also often the best solution in the case of damage or ageing.
Can I also have my roof window renovated on my own?
Yes, it is possible to renovate your VELUX roof window by, for example, replacing the glass or repairing the tilt system. This can be a cheaper solution if the frame is still in good condition.
How much does it cost to replace a skylight?
Replacing a standard skylight usually takes one day, depending on the complexity of the job and the type of window.
How long does it take to replace a skylight?
A properly installed roof window should be watertight. If you experience any problems with leaks, contact us immediately. We will perform a quick inspection and fix the problem at no extra cost if it is within the warranty period.
Can I replace a skylight myself?
It is technically possible, but we recommend that this is done by a specialist. Errors during installation can lead to leaks and insulation problems.