Dormer Loft Conversion Cost: A Budget Guide For You - Powerpillar

Dormer Loft Conversion Cost: A Budget Guide For You

by | Dec 1, 2021 | Loft Conversion | 0 comments

Renovating a home, adding new spaces or converting useless spaces into beneficial ones is one of the most commonly done activities in London. Recently, there has been a shortage of homes in London due to an increase in population. Most homeowners are seen to extend their house or convert their garage to make space. Another excellent idea for adding an extra faculty to your home is dormer conversion. It is not much commonly seen, but now with the growth of families and the need for additional space, people are converting their dormers into liveable spaces. Therefore, today our focus will be all the essentials you need to account for while doing a dormer conversion, including the Dormer Loft Conversion Cost.

What is a Dormer Loft Conversion?

Before knowing how much does a Dormer Loft Conversion cost, you must have a good know-how of the dorm loft conversion. What is dormer loft conversions? 

A dorm loft conversion is an extension of a building from the roof slope. In addition, it is an expansion of the already existing rooftop to increase the space. It forms a box-like structure added on the roof by creating walls.

 In essence, it has the potential to add a lot of space to your house in a very cost-effective way. Depending on the style, many types of dormer extensions can be made that protrude from the roof slope. The majority of the work is done from outside the building. Therefore, this type of loft conversion creates minimal disruption to most of the work being done. It is entirely up to you to determine what kind of dormer loft conversion will work best with your property type and current roof size and shape.

Types Of Dormer


Angular fronted

Under the rooftop, they form a triangle formed by two sloping sides that include a pitched roof. It is common to build single small shelters, as they add an appealing flash of light and provide a fair bit of extra space.

Porch dormer

The main difference between these and gable-fronted dormers is the sheer number of sloping sides instead of only two. With this dormer, you have more horizontal space than in a gable dormer and more headroom than in a shed dormer.

Shed dormer

The roofs of these sheds slope in a similar direction to the main top but have a shallower pitch. The roof has no peaks or hips, which reduces construction costs. The purpose of installing these dormers is to provide more space for a significant number of people.

Flat roof dormer

They consist of box-like structures with a flat top, and they are typically built as an addition to the back of a house. There are many advantages to these designs, the main one being the amount of interior space and head height as all of the walls are vertical, though, on the downside, they can seem an odd addition to a property due to the way the walls are arranged.


The plot needs two dormers: one above the main house’s roof and one above the rear extension. The two dormers meet in this way to form an L shape which is formed by the two intersecting lines. It is not uncommon for Victorian terraced houses to be designed in such a manner.

How much does a loft conversion cost in 2021?

Each type of dormer loft conversion cost London differs according to area and design.

Although the average cost of dormer loft conversion will depend on the size of your loft and the type of conversion you choose, here are some guidelines. So let’s get straight to the point.

There is a price range between £25,000 and £29,000 for a dormer loft conversion of 20 square meters, while the average dormer loft extension cost of 30 square meters is between £38,000 and £44,000 to be exact.

It is safe to expect that if the property you are buying is more significant than 40 square meters, it will cost you from £50,000 to £58,000.

In addition to hip to gable loft conversions, hip-to-gable loft conversions are another type of loft conversion that carries a typical price of £35,000 to £50,000 for a small loft conversion of 20 square meters.

A dormer loft conversion cost measuring more than 40 square meters can be as much as £60,000 to £100,000. In comparison, a loft conversion that measures less than 30 square meters will only cost you around £45,000 to £75,000, and anything more significant than that will cost approximately £60,000 to £100,000!

Mansard dormer loft conversions are considered one of the most expensive home extensions. The prices for a small mansard loft conversion can start from £45,000 to £50,000, going up to £55,000 to £60,000 – whereas the cost of an extensive master loft conversion can reach £65,000 to £70,000 or more.

 Final Words

When it comes to running your project smoothly, hiring professionals will be of great help. Suppose you are interested in getting a loft conversion. The dormer may be a good option if you want to make your loft conversion more spacious and with more headroom. In that case, a power pillar can design your loft conversion; then, scale, we can produce drawings and calculations to demonstrate that it meets the latest regulations and get the necessary approvals for your dormer conversion.

Emmanuel Nwaebo

Emmanuel Nwaebo is the Managing Director at Powerpillar Ltd and has more than 25 years experience in building construction and renovations. He has a bachelor’s in Electronics and Electrical Engineering with certification in Construction Health and Safety Technician (CHST). With an experience in managing construction and renovation services for years, he is extremely passionate about property management and loves helping people find their dream property.

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