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The actual amount you are likely to end up spending on a loft or basement conversion depends largely on the size of the room and its original condition. Any instances of dry rot or any other kind of structural damage will have to be dealt with before any alterations can begin. The prices mentioned below have factored in the likely cost of clearing the loft or basement as well as relocating any significant features such as a water tank.

Loft conversion prices

As a general rule, dormer conversions, which involve actually extending the roof, are more expensive than velux conversions, which make use of the existing space. Also, the more windows in the loft, the more expensive then conversion will be.

Loft Conversions and Pricing

The prices below take account of room clearance, insulation, electrics and heating, plus the cost of adding a staircase. Discounting any of these tasks will reduce the overall cost of the conversion. These figures are rough estimates and may not be representative for the whole of the country.

A velux conversion of a small room (approx 4m squared) will cost in the region of £18,000.

A velux conversion of a larger room (approx 9m squared) will cost around £25,000.

A dormer conversion of a small room is likely to be around £33,000.

A dormer conversion of a large room is likely to cost in the region of £43,000.

Basement conversion prices

The work involved in a cellar conversion is likely to include replacing the door and its frame, and adding a staircase; also, plastering and painting of the walls and other decorating tasks. As with a loft conversion, discounting any of these tasks will likely reduce the overall cost of the conversion.
Loft Conversions

A conversion of a small basement (approx 4m squared) will cost in the region of £11,000.

Add value to your property with a loft or basement conversion

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Either of these conversions effectively gives your home another room, which will very likely increase its value considerably. Homebuyers are keen to find properties which maximise the available space and offer more potential, and a house with a loft that can be used as another bedroom or a study, or a basement that makes a great play area or games room will be an extremely attractive proposition.

The most important thing is that your new conversion will perform the function that you need it to – making the time you spend at home more productive and enjoyable.

For more ideas about potential alterations to your existing property, take a look at our Garage Conversions section.