Table of Contents
Introduction of Dormer Windows
‘Dormer’ is derived from the French word ‘dormer’ which means ‘sleeping room’. lucarnes were used to provide ventilation to the spires of buildings thus the oldest form of lucarnes dormers.
Dormers were also used in Britain as domestic architecture in the 16th century. Since then it has become prevalent and is still used to be used at present.
Before installing a dormer window for a new house construction or loft conversion, it is necessary to know about its pros, cons, and styles.
What Is Dormer Window?
A dormer is a form of a roof window project outside the vertical roof. The dormer window is a window exiting on the pitch of the main roof sitting vertically in the frame structure.
The dormer window is located on the sloping side of the roof and provides natural light in the room with an attic, loft, or vault. A dormer window is often found in architecture such as colonial, Greek revival, and cottage-style.
Dormers are commonly used to open a window in the loft and in the ceiling plane. Different types of dormer architecture are the leading element of many buildings to complement different styles. Such windows are commonly known as lucarne on the church and cathedral spears.
Also Read: All About Sliding Windows | Types of Sliding Windows | Sliding Window Replacement
Types of Dormer Windows
Below are the different types of dormer-style windows.
1. Gable Dormer Windows
Gable dormers are the most common dormer type in the world. This type became widespread after the cap cod style became a popular design in the 1950s in the United States.
This type has a simple pitched ceiling with two sloping planes in the dormer and is supported by a vertical frame. The triangle section is formed. They are also called ‘Doghouse’ dormers because of the similarities in their shape.
This is a simple task to add light, symmetry, and space at home. This type is useful to help water flow down from the sides and away from the windows, so it helps prevent floods, leaks, and structural damage in homes. Gable dormers make groups of 3-5 dormers on the ceiling in most homes with ceilings.
Nowadays, the shape of the gable depends on the structure system used in the home, aesthetic concerns, the availability of materials, and the climate. The colder the winter, the more the risk of ice increases and thus decreases the intensity of the sloping roof.
2. Hip Dormer Windows
Hip dormers have a ceiling that consists of three sloping planes. These planes grow from each side of the frame and gather at a space on the ridge. The hipped roof is usually a gentle slope and has no other vertical sides or gables.
Hip dormers are made on all sides with the same pitch or slopes, which makes them symmetrical. They reach the center point of contact. This type has a beautiful compatible level facia for the sewer easily fitted around the dormer.
The hip roof is not as easy as a gable roof because it is more difficult to tie it due to the necessary rafts or the complex system of the truss. This type can give a home a compact and concrete look.
The hip roof is self-bracing and requires much less diagonal healthy than most other dormers. This type of roof is more appropriate in the storm region. Hip dormers are difficult to maintain and they are not able to provide a lot of natural light as gable types.
3. Eyebrow Dormer Windows
Eyebrow dormers originated in Britain. Boston’s architects first used it in the 19th century and then became popular in America. They add a little composition to the large buildings as they break the monotony of a flat inner ceiling or rectangular, linear ceiling.
They are commonly found in the post-model beach house and modern cottage designs. Custom-med sash, even if it is certain that it is necessary to make a hinged, with an eyelid dormer. They require a difficult framing process so they are an expensive dormer type.
This type gives a lot of light to the interior room. The eyebrow dormer is seen in different sizes and shapes, from high half-round to Richardsonian sine curve.
4. Shade Dormer Windows
Shade dormers have a single flat plane ceiling, and the ceiling slopes in the same direction as the dormer but at a pinch angle. These windows are actually made to provide a headroom with a large area of space.
The dormer requires a separate roof cover because the ceiling pitch in this type is shallow than the ceiling. The overall cost of this type is higher, and therefore, it becomes a less favorite type. Shade dormers have no hip or top beside it is not rounded at all. This is helpful in increasing the space below.
5. Pediment Dormer Windows
Most dormers fit into the roof of any home but the pediment dormer actually extends away from the roof of the house. They get support from posts or pillars. This type is very popular in America. This type is useful for designing a home based on modern or contemporary design.
The main function of the pediment dormer is that they provide shelter. They are usually very useful to create spaces covered over entries, driveways, courtyards, or porches.
They allow light to penetrate and create the illusion of space. This type is a bit expensive, the reason is that its costs include finished undersides, high-end materials, architectural windows, and pillars.
Dormer Window Installation
The important things and steps to install dormer windows are outlined below.
- A dormer frame is created at the same time as the framing roof structure is prepared at the time of the new home.
- Sheathing means plywood that covers framing studs. The sheathing is attached to the outside dormer walls and the rafts of the main roof.
- The next step is to install a vapor barrier wrap on the cover on the vertical walls of the dormer. The window is usually installed forward, then shingles are installed on the dormer ceiling and the main roof at the same time so that there is no visible transition between the two.
- The interior of the dormer is finished after the external work is completed. Painted and trimmed etc. At the same time, the internal loft space is finished.
- When the dormer window is retrofitted, the main focus is to reduce the time the gaping hall is in the ceiling. Internal framing, such as internal rafts or tries should be made before.
- The outer frame of the dormer is made on the surface of the roof. When it is completed, the connecting hall is cut from the ceiling. Only then the extra framing is done.
- It is best to do this when we are changing shingles in an existing house if you have a consideration about returning one or more dormer windows. This way it is easy to put new shingles on the entire ceiling at the same time. This can provide the most harmonious look.
Dormer Installation Cost
The average cost of window dormers can be approximately $ 5500. The cost to install dormer windows is probably priced between $ 4000 and $ 10000.
Dormer Window Replacement
When it comes to house improvement, construction can be difficult to consider in view of various building control and planning laws. Generally, it is important to get planning permission when installing new dormers in the front of the house.
Planning permission is not required to change the dormer window if there is already a dormer window in the building. However, it is advisable to investigate with your local authority.
Dormer window replacement is a bit of anxiety because it has to be vandalized in the ceiling and this makes this window a costly replacement.
Advantages of Dormer Windows
Here are the Dormer Windows Pros as follows.
1. Headroom
This window provides more head space as it makes a hole in the roof. The small box shape loft conversion of the dormer gives much more space.
2. Beautiful Design
These windows are very useful in bringing natural light which proves to be helpful in improving the environment of the area.
3. Source of Light
These windows are very useful in bringing natural light which proves to be helpful in improving the environment of the area.
Disadvantages of Dormer Windows
Here are the Dormer Windows Cons as follows.
1. Less Energy Efficient
This window has a problem with air leakage from the roof space so it is less energy efficient.
2. Cost
It costs more money to install additional windows. The roof has to be broken to put this window, which is the main reason for the increase in costs.
3. Difficult to Install
Since installing a dormer window is complex, the DIY project is not suitable. This task is dangerous so it is imperative to seek the help of a professional experienced.
Frequently Asked Questions:
Dormer Skylight Difference
The dormer is a part of the roof that is not on the main roof line. Dormers are usually slightly below the ceiling and above the eaves of the house.
How Much Do Dormer Windows Cost?
The average cost of window dormers can be approximately $ 5500. The cost to install dormer windows is probably priced between $ 4000 and $ 10000.
What Is the Purpose of Dormers on a House?
Dormers are built on the ceiling and have a window installed. They are projected vertically, outside the roof plane. Dormer is a great way to add space to lofts or attics.
Dormer Window Replacement Cost
The average cost of window dormers can be approximately $ 7500. The cost to install dormer windows is probably priced between $ 5000 and $ 12000.
Dormer Windows Design Ideas for Homes
Dormer windows are a charming architectural feature that can enhance the aesthetic appeal and functionality of your home. Whether you’re looking to add more natural light, increase usable space, or enhance the architectural style, dormer windows offer a versatile design element. Here are some inspiring dormer window design ideas for homes:
- Gable Dormers: Gable dormers are one of the most common and classic types of dormer windows. They feature a triangular roof with two sloping sides that meet at a ridge, forming a gable. Gable dormers add architectural interest to the roofline and provide ample space for windows. They work well with various home styles, from traditional to modern.
- Shed Dormers: Shed dormers are characterized by a single sloping roof that extends from the main roofline. This design creates additional headroom and usable space within the attic or upper floor. Shed dormers are ideal for maximizing natural light and ventilation and work well with homes that have a contemporary or rustic aesthetic.
- Hipped Dormers: Hipped dormers have a roof with three sloping sides, forming a hipped shape. This design adds a touch of elegance to the roofline and complements homes with hip roofs. Hipped dormers are often used in combination with other dormer styles to create visual interest and architectural variety.
- Eyebrow Dormers: Eyebrow dormers have a unique curved or arched shape, resembling an eyebrow. They add a touch of whimsy and softness to the roofline, making them suitable for homes with a cottage or romantic architectural style. Eyebrow dormers are often smaller in size and feature curved windows, creating a charming focal point
Dormer Windows Installation Cost in the USA
The cost to add a dormer to a roof or attic is $90 to $150 per square foot or $3,000 to $25,000 on average. Building a shed dormer costs $75 to $120 per square foot, including labor and materials. Fitting a dormer window costs $2,400 to $6,600 with installation.
Types of Dormer Windows for Attic Conversions
converting an attic space into a functional room, dormer windows are a popular choice to bring in natural light, create additional headroom, and enhance the overall aesthetic appeal. Here are some types of dormer windows commonly used in attic conversions:
- Gable Fronted Dormer: Also known as a dog-house dormer, the gable fronted dormer features a simple, triangular roof that extends vertically from the existing roofline. It provides ample headroom and floor space, making it ideal for creating functional living areas or bedrooms in the attic. The vertical window wall allows for maximum natural light and ventilation.
- Shed Dormer: A shed dormer has a single sloping roof that extends horizontally from the existing roofline, resembling a shed. It offers increased headroom and floor space along the length of the dormer, making it suitable for larger rooms or areas requiring more usable space. Shed dormers are versatile and work well with various architectural styles.
- Hipped Dormer: A hipped dormer has a roof with three sloping sides, forming a hipped shape. This style adds an element of elegance and architectural interest to the attic conversion. Hipped dormers work best with homes that already have a hipped roof design, creating a seamless and harmonious transition.
- Eyebrow Dormer: An eyebrow dormer features a gently curved roofline, resembling an eyebrow shape. This type of dormer is characterized by its soft, rounded appearance and adds a touch of charm and character to the attic space. Eyebrow dormers work well with cottage-style or traditional homes and are often smaller in size.
- Flat Roof Dormer: As the name suggests, the flat roof dormer has a flat roof design, making it a suitable option for contemporary or modern-style homes. It offers a clean and streamlined look, allowing for larger windows and maximizing natural light. Flat roof dormers can be customized in various sizes and configurations to suit specific design preferences.
Pros and Cons of Dormer Windows in Architecture
Dormer windows are a popular architectural feature that can bring numerous benefits to a building’s design and functionality. However, like any architectural element, dormer windows have their own set of advantages and disadvantages. Let’s explore the pros and cons of dormer windows in architecture:
Pros of Dormer Windows:
- Increased Natural Light: Dormer windows allow for more natural light to enter the interior spaces, brightening up the rooms and reducing the reliance on artificial lighting during the day. This not only enhances the overall ambiance but also helps create a healthier and more inviting living environment.
- Improved Ventilation: Dormer windows can be strategically positioned to promote better airflow and ventilation within a building. By introducing fresh air and facilitating the release of stale air, dormer windows contribute to maintaining good indoor air quality and regulating temperature.
- Enhanced Views: Dormer windows can provide panoramic views of the surrounding landscape, cityscape, or any other desirable scenery. They offer an opportunity to frame and showcase picturesque vistas, adding visual interest and creating a connection between the interior and the exterior.
Cons of Dormer Windows:
- Cost: Installing dormer windows can be a significant investment due to the additional structural modifications, roofing work, and window installation involved. The complexity of the project and the need for professional expertise can contribute to higher costs compared to simpler window installations.
- Potential for Roof Leaks: Improper installation or inadequate waterproofing of dormer windows can lead to water infiltration and roof leaks. It is essential to ensure proper flashing, sealing, and roof integration to prevent water damage and maintain the integrity of the building envelope.
- Impact on Roof Design: Adding dormer windows alters the original roof design and can impact its aesthetic appeal. The size, shape, and placement of dormers need to be carefully considered to maintain a balanced and harmonious roofline. In some cases, the addition of dormers may not suit certain architectural styles or may require substantial roof modifications.
Best Materials for Dormer Windows Construction
When it comes to selecting materials for dormer window construction, several options are available, each with its own advantages and considerations. The choice of material should align with factors such as durability, aesthetics, maintenance requirements, energy efficiency, and budget. Here are some commonly used materials for dormer windows:
- Wood: Wood is a traditional and popular choice for dormer windows due to its natural beauty and versatility. It offers excellent insulation properties and can be easily customized to match the architectural style of the building. Wood can be painted or stained in various colors and finishes to achieve the desired look. However, wood requires regular maintenance, including painting or sealing to protect against moisture, rot, and insect damage.
- Vinyl: Vinyl is a low-maintenance and cost-effective material for dormer windows. It is highly durable, resistant to rot and pests, and does not require painting or sealing. Vinyl windows also provide good insulation and energy efficiency. They are available in various colors and finishes, offering design flexibility. However, vinyl may have limitations in terms of architectural authenticity and customization options compared to other materials.
- Fiberglass: Fiberglass is a durable and long-lasting material suitable for dormer windows. It is known for its strength, resistance to warping and cracking, and low maintenance requirements. Fiberglass windows offer excellent energy efficiency and insulation properties. They can be painted or finished to mimic the appearance of wood. However, fiberglass windows tend to be relatively more expensive than other materials.
- Aluminum: Aluminum is a lightweight and durable material commonly used for dormer windows. It offers good strength, resistance to corrosion, and low maintenance requirements. Aluminum windows are available in a variety of styles and finishes. They provide good insulation and can be thermally improved with the addition of thermal breaks. However, aluminum is a conductor of heat, so without proper insulation, it can contribute to heat transfer.
- Clad Windows: Clad windows combine the benefits of different materials. They typically feature a wood interior for its aesthetic appeal and an exterior cladding of aluminum, vinyl, or fiberglass for enhanced durability and weather resistance. Clad windows provide the warmth and beauty of wood on the inside while offering low maintenance and durability on the outside. However, clad windows tend to be more expensive than windows made from a single material.
Dormer Window Cost
Here are some cost factors to consider:
- Size and Design: Larger and more elaborate dormer windows will generally cost more than smaller and simpler designs. Customized or architecturally unique dormer windows may also incur additional design and fabrication costs.
- Materials: The choice of materials will affect the overall cost. For example, wood windows tend to be more expensive than vinyl or aluminum windows. Higher-end materials like fiberglass or clad windows can also increase the cost.
- Window Type: The type of window chosen, such as single-hung, double-hung, casement, or fixed windows, will impact the cost. Energy-efficient features like Low-E coatings or multiple glazing can also add to the price.
- Structural Modifications: If structural modifications to the roof or existing framing are required to accommodate the dormer windows, additional costs may be incurred for the necessary construction work.
- Installation: Professional installation is typically recommended for dormer windows, and the cost will depend on factors such as the complexity of the installation, accessibility, and labor rates in your area.
Cost to Install a Dormer Window
Here are some cost factors to consider when estimating the installation cost:
- Size and Design: The size and design complexity of the dormer window will affect the installation cost. Larger dormer windows or those with intricate architectural details may require more labor and materials, leading to higher costs.
- Structural Modifications: If structural modifications are needed to accommodate the dormer window, such as roof framing, reinforcements, or changes to the existing roofline, additional costs will be incurred for the necessary construction work.
- Materials: The choice of materials for the dormer window will impact the installation cost. Different materials have varying labor requirements and installation techniques. Wood, for example, may require more labor for custom fitting and finishing, while vinyl or aluminum may be quicker and easier to install.
- Roofing Considerations: The type of roofing material and the condition of your existing roof can affect the installation cost. If the roofing needs to be repaired, replaced, or modified to integrate the dormer window, it will contribute to the overall cost.
- Window Type: The type and quality of the window itself will influence the installation cost. Different window styles, such as casement, double-hung, or fixed windows, may have varying installation requirements and labor costs.
Dormer Window Styles
Dormer windows come in various styles, each offering unique architectural characteristics and design options. The choice of dormer window style should align with the overall aesthetic and functional goals of your home. Here are some popular dormer window styles:
- Gable Fronted Dormer: Gable fronted dormers, also known as dog-house dormers, feature a simple triangular roof that extends vertically from the existing roofline. This style is characterized by its traditional and classic appearance. Gable fronted dormers work well with various architectural styles and provide ample interior space and natural light.
- Shed Dormer: Shed dormers have a single sloping roof that extends horizontally from the existing roofline, resembling a shed. This style offers additional headroom and floor space. Shed dormers are versatile and can be customized in size and shape to suit the specific needs of the space. They work well with contemporary and traditional architectural styles.
- Hipped Dormer: Hipped dormers have a roof with three sloping sides, forming a hipped shape. This style adds a touch of elegance and architectural interest to the roofline. Hipped dormers are often used in combination with other dormer styles or on homes with hipped roofs. They provide an opportunity to create a unique and visually appealing design element.
- Eyebrow Dormer: Eyebrow dormers have a curved or arched roofline, resembling an eyebrow shape. This style adds a sense of whimsy and softness to the roofline. Eyebrow dormers are smaller in size and create a charming and unique focal point. They work well with cottage-style or traditional homes.
- Flat Roof Dormer: Flat roof dormers have a simple, horizontal roof design, offering a clean and modern aesthetic. This style is commonly used in contemporary or minimalist architectural designs. Flat roof dormers provide larger window openings, maximizing natural light and views.
Dormer Window Styles
Dormer windows come in various styles, each offering unique architectural characteristics and design options. The choice of dormer window style should align with the overall aesthetic and functional goals of your home. Here are some popular dormer window styles:
- Gable Fronted Dormer: Gable fronted dormers, also known as dog-house dormers, feature a simple triangular roof that extends vertically from the existing roofline. This style is characterized by its traditional and classic appearance. Gable fronted dormers work well with various architectural styles and provide ample interior space and natural light.
- Shed Dormer: Shed dormers have a single sloping roof that extends horizontally from the existing roofline, resembling a shed. This style offers additional headroom and floor space. Shed dormers are versatile and can be customized in size and shape to suit the specific needs of the space. They work well with contemporary and traditional architectural styles.
- Hipped Dormer: Hipped dormers have a roof with three sloping sides, forming a hipped shape. This style adds a touch of elegance and architectural interest to the roofline. Hipped dormers are often used in combination with other dormer styles or on homes with hipped roofs. They provide an opportunity to create a unique and visually appealing design element.
- Eyebrow Dormer: Eyebrow dormers have a curved or arched roofline, resembling an eyebrow shape. This style adds a sense of whimsy and softness to the roofline. Eyebrow dormers are smaller in size and create a charming and unique focal point. They work well with cottage-style or traditional homes.
Minimum Roof Pitch for Dormers
Roof pitch is another important variable. In general, a 11/2-story house with a roof pitch of 8-in-12 or steeper is suitable for a shed dormer. Of course, a shed dormer’s roof slope needs to be shallower than the primary-roof slope, but it’s best to keep the dormer-roof slope at least 4-in-12 or steeper.
How Much Does It Cost to Add a Dormer?
If you’re looking to install a new dormer to your existing roof, it typically costs between $2,500 to $20,000, or $115 per square foot, depending on the size of the dormer you want to install.
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