Installing a Velux window is one of the most effective ways to brighten a dull room, add ventilation, and improve the overall comfort of your home. Many properties with sloped roofs or attic spaces lack natural daylight, making the area feel closed and unwelcoming. A how to fit velux windows changes that instantly. It brings in daylight, offers beautiful sky views, and makes the room more useful and enjoyable.
Even though fitting a how to fit velux windows may seem like a complex job, understanding the steps makes the process far easier. This guide explains every stage in simple English so homeowners can feel confident whether they plan to install the window themselves or hire a professional.
Why Choose a Velux Window?
Velux windows are known worldwide for their quality and performance. They are specially designed for pitched roofs and offer excellent insulation, secure locking systems, and long-lasting durability. What makes Velux stand out is the attention to detail in both design and functionality.
Velux windows can reduce energy bills by improving natural light and ventilation. They are available in many sizes, so they work well in lofts, bedrooms, staircases, storage rooms, or any sloped-roof area that needs extra brightness. Because they open outward, they save indoor space and allow easy airflow.
When installed correctly, Velux windows also help regulate temperature. They prevent excessive heat loss in winter and reduce heat buildup in summer, making your home more comfortable throughout the year.
Planning Your Velux Window Installation
Planning your Velux window installation is crucial for a smooth and successful project. Start by choosing the ideal location, ideally between existing roof rafters to avoid major structural changes. Think about where natural light will fall and how the window will look inside the room. The height also matters—a low window may affect furniture placement, while a high one can be hard to reach. Make sure your roof pitch matches the window model, as this affects drainage and performance. Finally, check local building regulations, as some areas require approval before making changes to the roof structure.
Choosing the Right Velux Model
Velux offers different types of windows, each suited for various needs. The most common styles include:
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Top-hung windows, which open outward at the top. These are perfect for loft conversions because they provide a clear, open view.
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Center-pivot windows, which rotate in the middle. These are ideal for spaces where furniture sits below the window.
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Electric or solar-powered windows, which open automatically with a remote. They are perfect for high ceilings or hard-to-reach areas.
You also need to choose the correct glazing type. Double glazing is popular for insulation, while triple glazing works well in colder climates. Noise-reduction glass is an option for homes near traffic or airports.
Selecting the right flashing kit is equally important. Flashing is designed to seal the window and prevent leaks. Velux flashing varies depending on your roofing material—tiles, slates, shingles, or metal sheets. The correct kit ensures a watertight and secure installation.
Fixing the Window Frame in Place
With the opening complete, the next step is fitting the Velux frame. Before installing it, the sash (the part with glass) is usually removed to make handling easier. Velux frames have brackets that attach directly to the rafters or support timbers. Position the frame carefully inside the opening and check that it is perfectly level. Even a slight tilt can affect the window’s opening and closing. Once the frame is level, secure it with screws through the brackets. After this, the insulation collar is placed around the frame. This collar is designed to reduce heat loss and prevent drafts.
A vapor barrier is added next. This layer stops moisture from entering the roof structure, which helps prevent mold and condensation problems.
Installing the Flashing Kit
Flashing is one of the most important parts of installing a Velux window. Without proper flashing, rainwater can get under the tiles and cause leaks. Velux flashing kits are designed to guide water around the window and down the roof. Installation begins with the bottom flashing, which directs water away from the base of the window. Next, the side flashing pieces are installed. These interlock with the roof tiles to create a smooth and watertight finish. Finally, the top flashing is added, completing the weatherproof seal.
Once the flashing is secure, the roof tiles or slates are carefully cut and fitted back around the window. These should sit neatly against the flashing to maintain the natural look of the roof.
Reattaching the Sash and Checking Operation
After the exterior is sealed, the sash is placed back into the frame. Velux windows are designed so the sash clicks into position easily, but it must be handled gently to avoid damage. Once installed, open and close the window several times to ensure smooth operation. Check if it locks properly and opens without sticking. If anything feels uneven, the frame may need small adjustments using the built-in adjustment screws.
A good installation should allow the sash to move effortlessly and sit tightly against the frame when closed.
Completing the Inside Finish
The final stage of fitting a Velux window is the interior finish. This makes the installation look clean and professional. Plasterboard is fitted around the internal edges of the window. It should be cut neatly so the window sits flush with the wall. Additional insulation can be placed behind the plasterboard to enhance energy performance. Once the plasterboard is secure, it is sealed, sanded, and prepared for painting. Most homeowners choose a white finish, as it reflects light and helps brighten the room even more.
The internal finish is not only decorative—it also improves thermal efficiency and prevents moisture from entering the roof structure.
Benefits of Installing a Velux Window
Adding a Velux window offers many advantages:
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It increases natural daylight.
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It improves airflow and ventilation.
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It reduces the need for artificial lighting.
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It enhances room temperature control.
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It increases property value.
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It makes attic and loft spaces feel more open and usable.
These benefits make Velux windows a smart investment for both comfort and home improvement.
DIY or Professional Installation—Which Is Better?
Some homeowners choose to install their Velux windows themselves, especially if they have experience with DIY projects. This can save money but requires confidence and skill because the work involves cutting into the roof.
Hiring a professional installer is often the safer option. A trained installer understands building regulations, structural safety, and proper waterproofing techniques. They also ensure the window operates correctly and remains leak-free for many years.
While professional installation costs more, it gives peace of mind and reduces long-term risks.
Final Thoughts
Fitting a Velux window is one of the best upgrades you can make to improve brightness, comfort, and airflow in your home. With proper planning, the right materials, and a careful installation process, your Velux window can transform any dark space into a bright and welcoming area.
This complete guide gives you a clear understanding of how to fit velux windows—from planning and preparing the roof to fitting the frame, flashing, and internal finish. Whether you decide to install it yourself or hire an expert, knowing the process helps you make confident and informed decisions.