
Dormers, which were first introduced in the early Gothic period, continue to attract homeowners searching for a certain elegance and refinement when it comes to the roof of their houses. In due part because of its timeless style, the dormer window perfectly adorns the exterior of any home.
Get Your Project Started Today
Submit your details and receive three free quotes from trusted contractors.
A dormer is essentially a vertical glass opening positioned on the slope of the roof. It is a particularly aesthetic element that ensures the penetration of light and the ventilation of your attic.
Dormer windows are extremely common in heritage buildings, and much more prominent in contemporary architecture. As a matter of fact, many people are tempted to turn their attic space into a habitable space due to the various possibilities offered by dormer windows. Nowadays, dormers can be rather large and have a particularly modern look. Check out these undeniably charming sources of light!
5 Things to Know About Dormers

Photo: Deposit Photo
1. The dormer window's style depends on how the attic is used
There are numerous styles of dormers: ox-eye dormer, shed dormer, flared gable dormer, and hipped dormer. The styles are truly infinite. The choice ultimately depends on the shape of your home and the purpose of your attic space.
For example, the shed dormer is distinguishable by its steep incline that follows the slope of the roof. As a result, the window possibilities are quite limited. Although it can be used for ventilation purposes, natural lighting will be limited. For this reason, the attic can be further used if converted into a storage space or a space that does not require much light.
However, if you want to turn your attic into a bedroom, then it would be better to opt for a hipped dormer. This type of dormer is covered by a flat roof, which allows the installation of a large window. The natural light will be optimized, as well as the ventilation of the room.
2. Dormers enhance the durability of your roof
Did you know that attics are the prime location for mould and fungus growth of all kinds? Since they tend to be dark, damp, cold, and often poorly ventilated, attics deteriorate easily, especially if poorly maintained.
Even if you are not converting your attic into a living space, having a dormer window put in is a great way to maximize the ventilation of your attic and provide additional natural lighting during the warmer seasons.
Note that mould and mildew issues will dissipate over time. However, keep in mind that roof insulation must be particularly effective to help effectively counteract humidity problems.

Photo: Deposit Photo
3. Avoid confusing dormers and skylights
It is not uncommon to see roofs featuring windows better known as VELUX. What you may not have known is that VELUX is also a brand that has been pioneering this field for close to 60 years. As a matter of fact, the name comes from the words ventilation and light: VE for ventilation and LUX for light. The main distinction to be made between a dormer and a VELUX window is in the positioning of the window itself. The dormer window is positioned vertically, while the VELUX is fixed into the roof.
A skylight will obviously be more exposed to all weather, and for this reason, it is usually double-glazed and has great sealing. On the other hand, the VELUX does not allow for space-saving like a dormer window. Moreover, the latter is usually installed by a professional roofer, as it represents an extensive amount of renovation, which is not the case for roof windows.
4. Dormers transformed into rooftop terraces
Modern homes tend to take on classic geometric shapes, giving them a trendy look. However, this does not prevent the installation of dormers, which, given their design possibilities, blend seamlessly with contemporary homes.
Today, dormer windows are made up of a deck and a bay window to fully benefit from the sunshine and the resulting comfort. Even if the dormers first appeared decades ago, it is a timeless element that has evolved over time!
Planning on transforming your roof into a terrace? Check out the article What to Know When Building a Rooftop Terrace in Canada.

Photo: Deposit Photo
5. Dormers allow for quite a space gain
Turning your attic into a living space can be a great way to expand your home. It is also without a doubt the best way to ensure its durability. In fact, neglected spaces tend to fall into disrepair, mainly because of the lack of heat.
Therefore, chances are, should your roof be directly sheltering a leaving space instead of a neglected or unused room, preservation will be enhanced. With your needs in tow, an architect will then be able to design your new dormer. This type of installation is ideal for any space gain in height and to further maximize the natural lighting of the room.
Once the plans have been drawn up, getting the appropriate municipal building permits will be a must, as most exterior home remodelling requires a renovation permit. After that, hire a professional roofer to finally make your roofing project a reality.
Looking for something else?
Related articles
The latest industry news, interviews, technologies, and resources.

Léa Plourde-Archer
•06 Mar 2025
In Canada, many buildings are equipped with flat rooftops. This type of roofing is very practical and often less expensive than a slanted roof. However, since we don’t see their surface, we’re more likely to forget to check their current condition.

Editorial Team
•16 May 2024
Formerly restricted to commercial, agricultural, and industrial buildings, sheet metal or corrugated metal has, as of late, made its way to the residential sector. On top of having great durability, such roofing material offers a wide range of possibilities in terms of innovative architectural designs. Are you looking to have sheet metal or corrugated metal roofing installed and want more information on the matter? Read on to learn what there’s to know.

Editorial Team
•07 Nov 2023
With city populations growing rapidly, and space becoming dense and limited, many are choosing to live in a townhouse or condo in lieu of more traditional housing choices. There are plenty of benefits to townhouse and condo living, but what are the rules and regulations for those interested in renovating?
Editorial Team
•03 Nov 2025
When it comes to the bathroom, the shower is an integral piece. As it’s central to day-to-day activities, it can help to define the layout of the space as well as the ambiance.

Editorial Team
•07 Nov 2023
Painting the façade of a house can be a long and arduous process. However, if the work is carried out well, the transformation can be rather drastic! When a quality product is applied to a well-prepared surface, said painted surface will have a longer service life.