Loft conversions

'Loft conversions are always popular as they make use of existing space,' says Michael O'Flynn. 'Adding an extra bedroom and bathroom can boost the value of your property by 15-20 per cent, and take it into a completely new price bracket.' Think carefully about who you employ, though. 'If you choose an off-the-peg conversion company, you'll get an off-the-peg solution,' points out Judith Tugman.

Properties built before around 1975 are most likely to be suitable. Modern trussed roofs may need more structural work, and an attic roof needs to be at least 2.3m high unless you're prepared to have the ceiling below lowered.

To be considered a proper room, it will need a permanent staircase. If you're planning a bathroom, think where soil pipes will go and whether your existing boiler could supply extra hot water.

Your local planning office can tell you if you need planning permission, as it can vary. You'll also need to comply with building regulations, including fire safety requirements.

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