If you’re searching for a way to improve your home’s functionality and aesthetics, adding a dormer might be the right solution for you. Dormer addition is more than just a renovation, it’s a great investment that offers more living space, enhances your home, and increases its market value.
The cost of dormer addition ranges from $8,000 to $31,000 with an average price of $13,000, depending on the scope of work and the project’s specific needs.
Before diving into the process of dormer addition, it’s crucial to understand everything about the costs of adding it. Stay with us, as we’ll discover all the prices and help you navigate the process smoothly to stay within your planned budget and maximize the potential of your space.
How much do dormers cost?
The cost of adding a dormer depends on numerous factors such as size, material, labor rates, style, and location. The price range for dormer addition goes from $8,000 to $31,000.
Costs depend on the specific project needs and local market conditions. The style of the home and the type of dormer framing chosen also affect the overall price.
In the table below, check out the price range to add a dormer:
| Average price | $13,000 |
| Low end | $3,500 |
| High end | $56,000 |
Now let’s explore the average cost for dormer addition in more detail.
The average cost of adding a dormer
The average cost for a dormer addition is $13,000 with the average total cost ranging from $4,000 to $26,000. The cost for dormer addition per square foot installed ranges from $100 to $160.
Check out the average cost to add a dormer by dormer size in the table below:
| Dormer size (square feet) | Average cost installed |
| 28 | $3,000 – $5,000 |
| 40 | $4,000 – $7,000 |
| 64 | $6,000 – $10,600 |
| 100 | $10,000 – $16,000 |
| 200 | $19,000 – $31,000 |
| 250 | $23,000 – $38,000 |
After exploring the average prices for dormer addition, let’s delve into specifics with the dormer cost calculator.
Dormer cost calculator
The following table shows us all the prices for a dormer addition project. Check out the costs to install or replace a dormer.
Average dormer cost calculator:
| National average cost | $13,000 |
| Minimum cost | $1,500 |
| Maximum cost | $76,000 |
| Average range | $8,000 – $31,000 |
After seeing all the dormer costs, let’s explore the prices for dormer installation based on different roof types.
Dormer installation cost by roof type
Adding a dormer costs from $75 to $310 per square foot installed, depending on the specific style. The most popular dormer styles are shed, and gable dormers. Barrel, arched, eyebrow, and hipped dormers are more expensive as their installation is more complex.
| Roof type | Cost per square foot |
| Gable/flared dormer | $150 – $200 |
| Shed dormer | $90 – $150 |
| Wall roof dormer | $85 – $125 |
| Flat roof dormer | $90 – $145 |
| Hip dormer | $130 – $150 |
| Recessed or inset roof dormer | $90 – $160 |
| Eyebrow dormer | $120 – $170 |
| Arch/barrel dormer | $120 – $180 |
| Pedimented roof dormer | $195 – $330 |
| Faux/false /prefab dormer | $95 – $120 |
After seeing the prices for different roof types, let’s explore the prices of adding a dormer to an existing roof.
Costs to add a dormer to a roof that already exists
Building a dormer on a roof that already exists ranges from $2,500 to $55,000, depending on the location type.
Check out the prices for building a dormer to an already existing roof by location:
| Type | Cost to build |
| Window dormer | $3,000 – $7,000 |
| Attic dormer | $20,000 – $55,000 |
| Dormer bathroom | $21,000 – $51,000+ |
Dormer window cost
Dormer window installation price ranges from $3,000 to $7,000, including both labor and material. They don’t add much space and are a more affordable option to build as they cost less than full dormers. However, they add a lot of natural light and ventilation to a space.
Attic dormer cost
An attic dormer costs from $20,000 to $55,000 and it’s a great addition that will make the attic space more livable. An attic dormer will let more light come into the room, making it perfect for an extra bedroom, office space, or kids’ playroom.
Dormer bathroom cost
Dormer bathroom addition ranges from $21,000 to $51,000 or more because they require plumbing work, and more labor and materials. They can be a great addition to the space as they’ll open it up and make it a perfect setting for spa treatments and nice long baths.
In the following text, let’s address the factors that affect the price of dormer addition.
Dormer addition cost factors
Every type of home addition requires a lot of planning and preparation. Home addition costs can be very pricey, as many factors influence the price. Dormer addition is a complex project, so it’s crucial to pay attention to each factor to have a successful addition.
Size of the project
Larger projects require more money. Installing more dormers can cost up to $120,000.
Dormer style
Dormer style plays a huge role in the price. Shed, gable or hip dormers have different levels of complexity when it comes to design, materials, and construction.
Roof type
Different roof types have different prices which affects the overall price of the project. For example, gable and shed roofs are more cost-effective than hip roofs.
Roof removal
Roof removal costs between $6 and $10 per square foot.
Roof repairs
To install a dormer safely, depending on the age and endurance, the roof may need repair. Roof repair costs range from $400 to $1,500 per square of roofing material.
Foundation reinforcement
The cost of foundation reinforcement costs from $4,500 to $12,500 for a dormer. In case your contractor discovers any foundation issues, and your foundation needs repair, the cost for it ranges from $2,500 to $5,500.
Cladding
Contractors will most likely choose cladding over traditional siding, and the cost for cladding ranges from $3 to $16 per square foot. It’s a good investment to keep a home safe from any water damage and humidity.
Permits
Every type of construction work requires a building permit. They are essential for a dormer addition project as well, as they ensure compliance with local building codes and regulations. Building permit cost ranges from $140 to $3,000, and it’s necessary to obtain it for a successful project as building without a permit can cause legal issues.
To get a building permit, you will need to provide a detailed site plan that will showcase an overview of a property’s layout.
Materials
The materials you choose for your dormer will significantly affect the overall price. Most homeowners always choose materials that match others on their home’s exterior. There are two things you’ll also need to consider when it comes to materials which are windows and siding.
Check out the prices for window, roofing, and siding materials in the tables below.
| Window material | Cost per window |
| Aluminium | $95 – $420 |
| Fiberglass | $550 – $1,550 |
| Vinyl | $150 – $950 |
| Wood | $180 – $1,400 |
| Wood clad | $400 – $1,300 |
One of the most popular choices for roofing materials is asphalt, as its price is very affordable.
| Roofing materials | Cost per square foot |
| Asphalt | $7 – $14 |
| Clay | $15 – $30 |
| Metal | $10 – $20 |
| Slate | $15 – $25 |
| Wood | $9 – $15 |
When you’re choosing siding materials, besides the price, consider the location, maintenance, and aesthetics.
| Siding materials | Cost per square foot |
| Aluminium | $4 – $8 |
| Brick | $15 – $25 |
| Stone | $9 – $35 |
| Stucco | $8 – $10 |
| Vinyl | $5 – $14 |
| Wood | $2 – $16 |
Labor
The biggest part of the budget goes to labor work. Labor costs range from $60 to $160 per hour for hiring a professional contractor to do the job. Hiring a professional who will do the architectural drawings for the project costs from $150 to $300 per hour.
We’ve finished exploring the various factors that affect dormer addition costs, so now let’s see how can different architectural styles impact the expense of your dormer addition project.
Cost of adding a dormer by style
Dormer addition can be very pricey and to get your dream space, you need to be well prepared about the costs. Each dormer style has a different cost, so it’s important to know the price ranges of the most common ones.
In the table below, check out the prices per square foot for adding a dormer by its style:
| Dormer style | Cost per square foot |
| Shed dormer | $95 – $130 |
| Gable dormer | $120 – $160 |
| Nantucket dormer | $100 – $150 |
| Flat dormer | $90 – $135 |
| Hip dormer | $125 – $145 |
| Prefab dormer | $85 – $100 |
Shed dormer cost
The cost of adding a shed dormer ranges from $95 to $130 and this type of dormer is a great option for adding square footage and increasing the small space. They are often used to create additional bathrooms, office spaces, and bedrooms.
Gable dormer cost
Gable dormer costs from $120 to $160, they make the space more open and are the most popular dormer type. They shed water and snow easily because they are triangular with peaked roofs.
Nantucket dormer cost
In case you can’t decide which dormer style is the one for you, the Nantucket is the best compromise. Nantucket dormer costs from $100 to $150, and they consist of two gable dormers that are linked by a shed dormer.
Flat dormer cost
These types of dormers have a flat roof that gives them a very modern look. Flat dormer addition ranges from $90 to $135, and they are perfect for expanding a room and providing more space. The only disadvantage of this type of dormer is that if you live in an area with lots of snow, the leaks are more often than with a sloped dormer.
Hip dormer cost
Hip dormers are a good option for transforming smaller places and getting more light. The cost for a hip dormer addition ranges from $125 to $145, and they look like a pyramid because they have roofings on three sides.
Prefab dormer cost
Prefab dormers’ prices range from $85 to $100 per square foot, and they are typically larger than other types of dormers. They are pre-built and then transported to the construction site for its installation. They reduce on-site labor costs and minimize material waste.
After determining the various styles for adding a dormer, let’s see the pros and cons of doing the dormer project by ourselves or whether it’s better to hire a professional.
DIY vs. hiring a pro when adding a dormer
Dormer installation is an extremely complicated project that requires a lot of knowledge and hard work. This type of project involves a lot of meticulous planning and experience to avoid any possible issues.
Installing a dormer yourself is possible only if you’re highly experienced in construction. Technically, if you DIY the project, you can save on labor, but in reality, dormer installation involves different tasks such as roofing, siding, framing, and window installation all of which require complete precision. Because of this, it’s always better to hire a professional.
You can expect to pay from $60 to $160 per hour for a professional contractor. A professional will take care of safety and make sure the project runs according to building plans and regulations. They have all the necessary skills and tools to run the process and ensure that dormer addition is done efficiently. Hiring a professional will reduce the number of possible mistakes and give high-quality results.
Be sure to get a licensed contractor with five or more years of experience. Get multiple quotes and ask for references and examples of their past work. This way you’ll make sure you choose the right contractor for your project.
Now that we’ve established different costs for a dormer addition, let’s check out some tips for saving money during our dormer project.
Tips on how to save money for dormer installation
Installing a dormer can be a very pricey project as it requires a lot of work. Before starting this type of process, be sure to determine the budget and try to stay within it.
Here are some cost-effective tips you can use when adding a dormer:
- Obtain multiple quotes from contractors.
- Get a smaller dormer and reduce the labor and material costs.
- Install one window per dormer, and invest in energy-efficient windows to save on future utility bills.
- Try using low-cost designs and materials, such as vinyl or overwood.
- Avoid using customized options and consider a prefab dorm design. This way, you’ll keep your labor costs down.
- Do the easier part of the work yourself, such as molding, painting, or adding trim.
- To avoid additional costs, minimize structural changes.
- Stay flexible to alternative design options.
After exploring the tips on how to effectively save money for a dormer installation, let’s address some of the most asked questions regarding the dormer addition and its costs.
Dormer addition cost FAQs
What is the cost of a dormer loft conversion?
The cost of a dormer loft conversion ranges from $21,000 to $71,000. The price can vary and depends on numerous factors such as materials, size, and location.
Do dormers add value to a house?
Yes, a dormer addition adds value to the property with an average ROI of around 40%.
How much does the dormer extension cost?
Dormer extension cost depends on numerous factors such as the size, materials, design, and location. The price for dormer extension typically ranges from $25,000 to $55,000 or more, depending on the scope of work and specific project needs.
What is the cost to dormer a cape?
The cost of a dormer cape home usually costs between $11,000 and $41,000 depending on the design of the dormer, size, or any structural modifications.
Understanding the costs is crucial for a successful dormer addition
To make informed decisions and ensure the project runs smoothly and stays within budget, it’s necessary to understand the costs of adding a dormer. Adding a dormer brings a lot of benefits such as increased space, more aesthetic appeal, improved functionality, and increased property value. It’s a smart investment that adds long-term value to your property.
A successful dormer addition project requires careful consideration of all the financial aspects, and planning the budget so that the project can run smoothly. With the right knowledge about the prices, we minimize the risk of errors and ensure staying on track with the process.
With a clear understanding of finances, homeowners also must pay attention to obtaining the necessary site plans for permits that will ensure compliance with local building codes and regulations.
In case you need help with obtaining all the permits, we specialize in providing expertly done site plans that will meet all the specific needs of your project. We are a confident partner with long-term experience that will help you navigate through the permitting process effectively.
For any additional information, feel free to contact us. Our team is ready to help and is dedicated to delivering high-quality solutions. With us by your side, your dormer addition is going to be a successful project from start to finish!
