Bringing more sunlight into your home is always a great idea—until you’re faced with a decision: skylights on roof or roof windows? While they may look similar, these two have some key differences that affect how they function, how they’re installed, and even how they influence your home’s energy efficiency.
Whether you’re building a new house or updating your current one, understanding these distinctions can save you time, money, and a whole lot of frustration. Let’s explore the 7 key differences between skylights on roof and roof windows, so you can choose the right solution for your space.
1. What Are Skylights on Roof and Roof Windows?
Skylights are fixed or operable glass panels installed in the roof to let natural light flood into a room. They’re typically used in areas where windows can’t be placed—like hallways, bathrooms, and attics.
On the other hand, roof windows are usually larger, can be opened easily, and are often installed within reach. These are most common in lofts or converted attic spaces.
Popular systems like Skylights Velux have blurred the lines by offering models that open like windows while still functioning as skylights. But in general, skylights are more about light, and roof windows are about light and air.
2. Purpose and Functionality
The main job of skylights on roof is to brighten up dark areas with natural daylight. They can be fixed (non-opening) or vented (manually or automatically openable).
Roof windows, on the other hand, offer the added benefit of ventilation. They’re often hinged at the top or center and can be opened wide to let fresh air in.
If your goal is to improve airflow and get some natural light, a roof window may be the way to go. If you only want to brighten a space with no access to the outdoors, installing a skylight is likely the better choice.
3. Position and Placement
Skylights are typically installed on sloped or flat roof sections and can be placed almost anywhere, depending on the home’s structure. Their placement is often dictated by where additional daylight is needed the most.
Roof windows, in contrast, are usually installed within reach and on pitched roofs, often between rafters. They’re meant to act as an actual window that you can open and enjoy views from.
Orientation matters too. North-facing skylights on roof give off cool, consistent light, while south-facing ones can heat up a space quickly. Make sure your contractor considers these factors during skylight installation.
4. Ease of Installation
Installing a skylight is typically simpler and faster than adding a roof window. Skylights are often integrated into existing roofing without needing much change to the structure.
Roof windows, however, may require framing modifications, especially if you’re retrofitting them into an older home. This makes the process more complex and potentially more expensive.
According to the Canada Mortgage and Housing Corporation (CMHC), roof modifications such as skylight or roof window installations must be carefully sealed to prevent air leakage, energy loss, and moisture issues—making it critical to follow building codes and professional installation practices. This is why hiring a professional is key for either type of installation.
5. Maintenance and Skylight Repair Needs
Because they’re often fixed and out of reach, skylights on roof can be harder to clean and maintain. Over time, debris buildup, condensation, or worn flashing may require skylights repair—especially after harsh weather or improper installation.
Roof windows, in contrast, are easier to access and clean, especially if installed within arm’s reach. They typically have built-in ventilation flaps and can be locked for safety.
Common issues with skylights include leaking around the edges, thermal cracks, and sealant breakdown. Choosing high-quality products like Skylights Velux can minimize these issues, but even premium systems are not immune to aging.
👉 If you’re not sure whether your skylight needs a quick fix or a full replacement, check out these 7 clear signs that your skylights on roof need replacement to help you decide what to do next.
6. Aesthetics and Interior Impact
From an interior design perspective, skylights create dramatic effects. They allow light to pour in from above, casting shadows that change throughout the day. They’re also great for showcasing ceiling height and adding a modern touch.
Roof windows, meanwhile, feel more traditional and offer framed views of the outdoors. You can install blinds, open them up to let in a breeze, and even enjoy stargazing at night.
Newer models of Skylights Velux offer automated features like built-in shades, rain sensors, and remote control access—blending both aesthetics and functionality.
7. Price Comparison and Long-Term Value
When comparing costs, skylights on roof are generally more affordable to install. Prices vary depending on size, glazing type, and operability. Energy-efficient skylights with double or triple glazing can significantly reduce heat loss during winter, according to Natural Resources Canada, especially when combined with Low-E coatings and inert gas fills like argon.
Roof windows, being larger and more complex, tend to cost more—both for the product and installation.
However, the long-term value depends on your home’s layout. Skylights can increase resale value by improving natural light, while roof windows can transform an attic into a livable room—boosting square footage.
Which One Is Best for You?
Here’s a quick breakdown to help you decide:
- Choose skylights if:
- You want more daylight in hard-to-reach areas
- You don’t need extra ventilation
- You’re looking for a simpler and budget-friendly option
- You want more daylight in hard-to-reach areas
- Choose roof windows if:
- You want light and fresh air
- You’re renovating an attic or loft
- You prefer easy cleaning and access
- You want light and fresh air
Final Thoughts: Ask a Roofing Professional
The decision between skylights on roof and roof windows comes down to function, budget, and lifestyle. No matter your choice, professional skylight installation is crucial for long-term performance.
Make sure your contractor considers your roof’s pitch, insulation, and local climate. For homes in coastal regions or areas with heavy snowfall, it’s essential to follow installation practices that align with Environment Canada’s climate data to avoid moisture issues down the road.Whether you’re choosing skylights on roof to brighten your mornings or roof windows to open up a view—knowing these key differences can help you make a decision you’ll enjoy for years.