How much does it cost to build a loft extension?

A loft extension can provide you with one of the best returns on your investment. Experts suggest that loft extensions add the most value to the property and hence, increase its price in the market as well.

Other than that, the loft extension also provides valuable extra living space, that is valuable – you can use it as a master suite, an extra bedroom, a study room, room for guests to stay and relax, an extra space for kids to play and hangout, a home office, gym or a home cinema.

The extra bonus is that you get all of it without sacrificing your lawn or any other space that you want to preserve.

How much the loft extension will cost you?

Loft extension costs will vary depending on the size, the space that is going to be utilized, whether you’ll need to alter its structure for staircase access or you already have an easy access to it, the type of extension you’re going for, the design that is going to be made and where is the area you live in the country, but as an average, loft extension will usually cost between 38,748.00$ and 64,580.00$.


To break it further, you need to identify the type of extension you are going for:

A basic, room in the roof extension:

The simplest of all loft extensions, it usually involves floor reinforcement, skylight(s), insulation system, a staircase for easy access, electrics, lighting, and heating installment plus fire safety measures. It can start from around 19,374.00$ (or around $1485.34-$1743.66per square metre).

A dormer loft extension:

It provides all the basic installments as in the basic form but with an additional dormer window. This might be your next best bet if the basic type doesn’t provide enough head height or floor space.  You should expect to pay from £20,000 for a basic extension; for the inclusion of an en-suite and a finish suited to a master suite, you’re more likely to pay $45206.00 upwards (or around $1614.50-$1872.82per square meter).

A mansard extension:

It applies only to pitched roofs, the Mansard style essentially works by creating an almost vertical-looking profile to one side of the slope (usually the rear side), raising the wall to an angle of at least 72 degrees and flattening the top of the roof. In terraced or semi-detached properties, the side that is going to be altered will often be the dual-party wall, sharing it with the next-door family and may require cooperation from the neighbor or owner of this connecting partition. For detached houses, it will generally be the gable wall that is raised and wouldn’t be an issue. (Cost: Around $58122.00)

A hip-to-gable extension:

Applies to a semi-detached house or a bungalow with a sloped roof on all sides. The roof is usually stripped and the slope is removed.  The end wall is then built up to form a new vertical gable. A standard pitched roof is made. The work creates a far greater area with full headroom. (Cost: Around $38748.00)

Ready-made loft extension:

They are built off-site and craned into position. They are quick to adjust and reduce labor. (Cost: Around $71038.00)

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