Dormer Cost

A dormer can be added for $13,000, with a price range of $2,000 to $35,000 or about $120 per square feet. There are many dormer options, including flat, shed, gable and eyebrow. For smaller projects like adding an eyebrow dormer for more light and visual appeal, it can cost as low as $4,500. For larger projects like a flat dormer, which creates more space, it can cost as much as $30,000

One of the most popular forms of loft conversion is the dormer.

The price of a dormer loft conversion will be affected by three factors:

  • The property’s size and the overall conversion
  • The number of dormers being increased
  • The final stage of the conversion. For example, will you be installing a bathroom?

Average cost to add a dormer

Costs for building a dormer vary depending on the size of the project and permits. The average cost to build a dormer is between $2,500 and $20,000. It is important to note that it can be difficult to design a dormer.

Cost factors

It is easy to underestimate the cost of installing a dormer, both in terms of overall project scope and costs. You should not be concerned about the cost of the dormer window, but the secondary costs that will increase the price. Angi explains in detail how the price of building a Dormer will be affected by these factors.


While you might be tempted to do this yourself, it is better to hire a professional to add a dormer. The cost of labor is estimated by roofing contractors in different ways. A professional roofing contractor will typically charge a flat fee, which is usually between 20% and 30% of the total project costs. This average hourly rate is $35 to $55 per an hour.

Type of roof

The type of dormer that you choose will depend on the architectural design of your roof. Some dormers are best suited for steep or angled roofs while others are better suited to regular roof designs.

Your roof type will impact the price of your dormer. A dormer installed in an attic will generally cost less than one that is not. It serves as an extension to the space. For $75 to $120 per square feet, attic dormers are available.


For additions like a dormer, framing is necessary. Framing a roof costs $6-$9 per square foot. Due to the complexity and cost of the design, adding a dormer is likely to be at the higher end.

Permit fees

A permit is required for most building projects. The permit is required by the state or local authorities to ensure that the project is completed in compliance with safety and codes.

Planning permission or a permit to build a dormer will be required. A building permit for an addition such as a dormer typically costs around $1,160 or $390 to $1,930. Your local laws will determine the true cost.

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