A Quick Guide on Dormer Loft Extension

Loft extensions are popular in the UK, USA, Canada, and other countries where people are concentrated in certain areas causing space shortages. To create more space for growing families, loft conversion and extension are becoming the solution of choice.

A dormer loft extension is popular among all the options available to create more room up there. So, if you are looking for a way to create extra space for an office, gym, extra bedroom, or any other use, this is the best option for you. That said, then it is good for you to have a guide on dormer loft extension. Fortunately, this article will take you through this.

What Is a Dormer Loft Extension?

Most architects say that a dormer is an additional “box-like” structure on top of a pitched roof. It comes with complete vertical windows and walls. The dormer should go as high as possible to create enough headroom for the new space, sufficient light, and essentially, more space.

A dormer loft extension should be designed and implemented with the help of an expert. Their role is to assess the house roof, draw the plan, seek approvals and permissions, and work with the builder to ensure the extension is secure and looks good aesthetically.

Common Dormer Loft Extension Options

The type of dormer loft extension you choose is significantly dictated by the house roof, preference, and other factors. There are a couple of options for homeowners.

Doghouse dormer – This is the best dormer loft extension aesthetically. It is just a vertical dormer with its own pitched roof. Therefore, it is most suitable for the front of the house.

L-shaped dormer – This is mainly dictated by the shape of the room. It involves two dormers that meet at the valley of a roof to form an L.

Flat roof dormer – This brings to mind the perfect definition of a “box-like” design because it has a horizontal roof meeting the vertical walls at 90 degrees. The roof is therefore parallel to the floor of the house. Architects recommend it at the back of the house because it is not the most attractive.

Mansard dormer – This dormer loft extension was designed by Francoise Mansard and looks like a flat roof dormer with the exception that the vertical walls slant at an angle of 70 degrees. Just like its counterpart, it is proposed for the back of the house.

Seeking Permissions for Dormer Loft Extension

There is a reason to smile because a dormer loft extension falls under permitted development. However, you will need to check with your local authorities about the particular details of your project. Therefore, you still need an architect to assess and conduct the planning accordingly. Apart from planning, the architect will oversee the entire project until you have habitable loft space.


As a newbie to dormer loft extension, it is important to work with a professional. Also, do some background research to equip yourself with knowledge on loft conversion. There is no harm in consulting with different professionals including authorities, architects, engineers, and builders.