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How much does a loft conversion cost?

When you run out of space in your home and extending or moving isn’t an option, then the only way is up - into the loft. Many of us manage to get some use out of the space about the ceiling, even if it’s just for storing Christmas decorations or old books, but if you’re serious about adding more space to your home, a loft conversion can be one of the most effective ways to address it. Whether it’s a dormer style conversion, a mansard conversion, or a hip to gable, each method can give you new rooms to enjoy and add value to your home. But before you get started, you need to know how much a loft conversion costs, so you can set a budget and begin your planning. We spoke to some of the experienced loft conversion specialists at The Renovation Gateway Ltd to find out how much you should expect to pay.

Loft conversion cost calculator

The cost of your loft conversion will depend on a variety of factors. The two key factors are the style of loft conversion you choose, and the size of your property.

As most lofts cannot be simply altered into habitable rooms due to building regulations, there will almost certainly be structural work that needs to be carried out to convert the loft. The main kinds of loft conversion are:

  • Adding a loft room: If you have the space already in the loft (i.e the height between the bottom of the ridge timber and the top of the ceiling joist is 2.2m or greater), then converting it into a room simply involves adding a staircase, skylights, insulation, and often reinforcing the floor, along with final fitting and decoration.

  • Dormer loft conversions: The most common style of structural loft conversion, these are an extension to the existing roof, building out sections with vertical walls from the roof to add floor space and room for windows. These are suitable for most types of home, including terraced house loft conversions. 

  • Hip to gable conversions: An option for detached and semi-detached homes where the roof has at least three slanting sides, a single hip to gable conversion fills out one of the sides by building a vertical end wall, giving you a larger amount of interior space. A double hip to gable conversion can be done on detached houses, building out on both sides.

  • Mansard roof conversions: These are the most dramatic style of conversion, involving changing the entire roof structure, adding a flat roof with sloping “walls” at 72 degree angles, and dormer windows added. It adds the most room, but significantly changes the exterior appearance of the property.

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