Velux Roof Windows Guide: Replace Old Skylights for Energy Savings 2026

Sometimes a small change makes a big difference: replacing old roof windows is a simple, accessible DIY project that delivers major comfort and energy-saving benefits. Whether you're upgrading for better insulation, modern design, or tax incentives, this guide covers everything you need to know about Velux roof windows.

Why Replace Your Old Roof Windows?

• 65% Tax Deduction: Replacing old roof windows with energy-efficient models qualifies for a 65% tax deduction in Italy. No permits are needed if the new windows match the old dimensions, and no technical consultant is required — just a product certificate from the manufacturer, which you can download from their website.
• Easy Installation: Swapping an old window for a same-size Velux is quick and straightforward, and no building authorization is necessary.
• Energy Savings: Velux roof windows improve cold insulation by up to 76%. Pair them with an external sunshade or roller shutter to reduce summer overheating by up to 95%.
• More Comfort, Zero Maintenance: New-generation Velux windows come standard with self-cleaning glass, so no exterior cleaning needed. Models with white polyurethane interior finish are easy to wipe down and require no upkeep.
• Innovative Design: Sleek, rounded lines and a choice of natural wood or white polyurethane interior finish make them perfect for any room, even modern interiors.

Which Glass Type?

• Standard Low-E: Better thermal insulation in summer and winter. Suitable for all Italian climate zones.
• Anti-Burglary: Extra security against break-in attempts, for peace of mind at home.
• High Thermal Performance: Meets strict Casa Clima and climate zone F requirements (coldest municipalities).
• High Sound Insulation: Ideal for high-traffic areas or near airports.

Which Opening Type?

• Center-Pivot (Bilico): Allows better use of space below the window. Easy to clean both sides from inside. A classic choice for most attics.
• Top-Hung: Offers a wider view and easier exit/entry. Great for rooms where you want to maximize natural light and ventilation.
• Electric or Manual? Consider motorized options for hard-to-reach windows, or stick with manual for simplicity.

Which Material?

• Natural Wood Interior: Warm, traditional look. Requires occasional care.
• White Polyurethane Interior: Modern, easy-clean, no maintenance. Perfect for bathrooms or kitchens.

The Three Steps for a Perfect Installation

1. Measure Carefully: Ensure the new window matches the old rough opening. Use a tape measure and double-check dimensions.
2. Prepare the Opening: Remove the old window and clean the frame area. Check for rot or damage — repair as needed.
3. Install the New Window: Follow Velux’s installation guide. Use proper flashing and sealing to prevent leaks. If you’re not confident, hire a professional.

How to Replace Old Roof Windows

Replacing a roof window is a manageable DIY project. Start by removing the old window carefully to avoid damaging the roof structure. Then, fit the new Velux window into the same opening, secure it with the provided brackets, and apply flashing and insulation around the frame. Finish with interior trim for a clean look. For a smooth installation, consider using home improvement tools and supplies from GrandGoldman.

FAQ: Velux Roof Windows

Q: Do I need a permit to replace a roof window?
A: No, if the new window is the same size as the old one, no building permit is required in most cases. Always check local regulations.

Q: How much can I save on energy bills?
A: Velux claims up to 76% better cold insulation. Actual savings depend on your climate and existing windows.

Q: Can I install a Velux window myself?
A: Yes, many homeowners do it themselves. But if you’re not comfortable working on a roof, hire a professional.

Q: What’s the best glass for hot climates?
A: Low-E glass with a sunshade or roller shutter reduces summer heat gain significantly.

Q: Are Velux windows available in different sizes?
A: Yes, they come in a wide range of standard sizes. Measure your opening carefully before ordering.

Enhance Your Home with GrandGoldman

While upgrading your roof windows, consider complementing your home with other stylish and functional pieces. For the living room, browse our sofas to create a cozy seating area. Add a rug for warmth, and dress the windows with curtains for privacy and style. In the bedroom, a new bed and mattress can transform your sleep. For the dining area, check out our dining tables and kitchen islands. And don’t forget lighting to set the mood in every room. For outdoor spaces, our outdoor patio furniture and garden supplies will help you enjoy the fresh air. Complete the look with wall decor and mirrors to open up your space.

Browse Grand Goldman Shop

Discover unique craftsmanship home decor at Grand Goldman Shop.