Renting out your spare room: how much can you make?

Most people see the spare room as a bit of dead space. Three quarters of us have one, and for the vast majority of people it's just home to the computer, the model train collection, or a tonne of dust. But it doesn't have to be a waste of space, because almost one in ten people in the UK are using theirs to make a decent wedge of cash.

So how much money can you make, and what do you need to consider before you take this approach?
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