• Gable Dormers cost $3,000 to $11,500 depending on the size and complexity of it.
  • Shed Dormers range in price from around $5,500 for a 12-footer to $11,500 for a 30-foot dormer.
  • Hip Dormers can cost anywhere from $4,000 up to $15,000 depending on what it’s being used for and the size of the dormer.

Types of Dormers & Costs

Dormers come in three very different styles, gable, shed and hip. Each has its own distinct look and you can find both widely used in homes around the country. No matter what option you decide to add to your home, it’s important to know what it will cost you.

Gable Dormers

Gable dormers are one of the most common types of dormers used in homes today. When most people think of dormers they picture gable dormers. These dormers are the little peaked boxes that jut up and away from the roof of a home. They have a peaked roof and look like little houses coming out of the house.

These dormers range in price from around $3,000 to $11,500 depending on the size and complexity of it. A small four-foot dormer might only add $3,000 to the cost of your home, while a much wider and taller dormer, say closer to 30 feet would cost closer to $11,500 to add to your home.

Shed Dormers

Shed dormers are very different looking from gable dormers and they aren’t added to homes quite as often, though they can be the more functional of the two dormer types. Shed dormers don’t have the peaked roof that gable dormers do. Instead, they are simply a lower pitch than the rest of the roof around them. This creates a nice flat roof with a slight pitch and creates a more squared-off space than what gable dormers can offer. While shed dormers don’t look as intricate and aren’t as much for architectural effect, they can add in a decent amount of space to an attic.

Shed dormers also range in price from around $5,500 for a 12-footer to $11,500 for a 30 footer according to Repair Home. The larger the dormer the more space you’re adding to your home, but in order to function properly the dormer has to be positioned lower than the rest of your roof or right at the peak of the roof so water can run down effectively.

Hip Dormers

Hip dormers look similar to gable dormers but instead of having a peaked roof with two panels coming together there are three panels coming together. This creates more gentle angles that aren’t quite as noticeable as what you would find with gable dormers. The end result is a happy medium between gable and shed. You get a bit more headspace that you’ll often find with shed, but you get more horizontal space than you would with the more aggressively peaked gable dormer.

Pedimented Dormer: When it comes to structure, pedimented dormers aren’t much different from gabled dormers. Instead, the difference is in the details. The architectural details of these dormers are inspired by ancient Greece and Rome, with a triangular shape on top of the window created with molding, and vertical molding on either side of the window to mimic columns holding the triangle up.

Arched Dormer: This style of dormer has French roots and is characterized by its roof, which has a gentle arch.

Oval Dormer: Oval dormers are very similar to an arched dormer. The big difference that sets an oval dormer apart is that the curve of the roof is larger and more pronounced.

Eyebrow Dormer: Although the eyebrow dormer has an arched roof, it does not have vertical sides. The lack of vertical sides results in a dormer the is very low, barely rising above the surface of the roof.

Inset Dormer: This dormer is named based on how it is built onto the roof. While most dormers rise up and away from the roof, an inset dormer is set back in the roof.

Composite Dormer: A composite dormer is designed by borrowing elements from multiple styles of dormers, and it will look different based on the architect responsible for the design.

The Unexpected Costs of a Dormer

Most people realize that adding a dormer to their home will cost them money in materials and labor to get the job done. What those people don’t realize is that there are other costs associated with the work as well that they should be aware of. Things like modifying the roof so it’s strong enough, or spikes in your insurance policy.

Reinforcing your Roof

If your roof system is already close to its limit you’ll have to spend money having it enhanced before a dormer is put on your home. That’s because dormers add weight to the roof of your home that might not be supported properly without enhancements. There is all the extra framing for a dormer, the roofing as well as the windows that are put in. That can amount to a serious amount of weight in larger dormers.

Insurance Policy Increase

Homeowner’s insurance usually goes off the square footage of your home. Adding dormers to your home will actually increase the square footage of your home which can lead to an increase in your insurance premium as well. This is something that you should be aware of. The added square footage could also help you get more for your home if you ever decide to sell it, so the improvement could pay off later on.

Dormers usually only make sense as additions to homes when you need the added space for rooms in your attic. When used properly they can add a significant amount of space to your home, but larger dormer projects can cost thousands of dollars and even lead to other necessary improvements to your home that will cost you even more.