5 Things to Know About Dormers

By Editorial Team

Updated on November 4, 2025

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

dormer_5 Things to Know About Dormers_Reno Quotes

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.

velux window_dormer_5 Things to Know About Dormers_Reno Quotes

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.

dormer_5 Things to Know About Dormers_Reno Quotes

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.


Get 3 free quotes for your project!

Submit a project and get 3 free quotes!

Looking for something else?

Table of contents

5 min read

Find contractors near you

Enter your postal code



Related articles

The latest industry news, interviews, technologies, and resources.

7 min read

Editorial Team

24 Sep 2024

Advantages and Characteristics of TIG or GTAW Welding

Tungsten inert gas (TIG), or gas tungsten arc welding (GTAW), is a welding technique known for its precision and quality. This article is an in-depth overview of said versatile welding method. Discover why TIG welding is a favourite amongst welding industry professionals. 

Exterior renovations
3 min read

Editorial Team

04 Nov 2025

How to Protect Your Roof from Hail and Extreme Weather

Hailstorms are becoming increasingly common in many parts of Canada, and their impact can be devastating for a roof. A roof punctured by hail can lead to water infiltration, structural damage, and costly repairs. Fortunately, there are several ways to strengthen your roof and prevent damage. Here’s a complete guide to choosing the right materials, adopting best practices, and preparing for hail events.

4 min read

Amanda Harvey

08 Nov 2023

What To Do If You Have a Problem With Termites

To any homeowner, termites are a dreaded potential pest. Although they play an important role in the ecosystem by recycling wood, facilitating the decomposition of organic matter, replenishing essential nutrients in the soil and assisting in the growth of new plant life, these little buggers can't tell the difference between a tree and a house.

7 min read

Léa Plourde-Archer

02 Oct 2024

10 Renovation Projects to Transform Your Bedroom

The decor and layout of a bedroom are more important than one might think. Given the role of this room, which is to serve as a place dedicated to rest, it is important to feel comfortable and to make sure that the room fulfils our needs. If you have landed on this article, this probably means that you are looking for a change!

3 min read

Editorial Team

08 Nov 2023

Home Renovation + Interior design trends for 2020

2019 is coming to an end, and we are leaving a decade behind us. For many, 2020 promises great things: it’s a return to zero as well as a new beginning. Some will seize the opportunity to finally start the projects that have been put aside, such as pressing renovations.

Renovation tips