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What is the average cost of a loft conversion?  

Thinking of getting a loft conversion? It’s an incredibly worthwhile investment, not only for achieving a functional space in your home but also for increasing the value of your property. In fact, according to the Homeowners Association, a high-quality loft conversion can boost the overall cost of your property by up to 20%.

Types of loft conversion

The type of loft conversion you settle on will be the main factor that contributes toward your cost. You’ll also need to consider whether or not there is enough space to achieve what you want and if you need to obtain planning permission.

A simple conversion that doesn’t require any of the outer structure of your property to be altered will tend to be the least expensive option. A velux loft conversion, for example, involves affixing windows to the roof to introduce natural light into the space. Generally, this type of conversion can cost anywhere between £20,000 to £25,000.

The most common type of loft conversion is a dormer, whereby a small flat-roofed extension with a window is added. Side and L-shaped dormers can create space for up to four new rooms in your home, meaning that you could be paying up to £45,000.

Changing the outer structure of your property will require more investment, with gable-end loft conversions at £42,000 – £48,000 and mansard extensions for around £50,000. The latter involves replacing one side of your roof to create a straight wall and a flat roof, often resulting in a whole new storey in your home.


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