Homeowners sitting on £63.4 billion of lodger loot

Indeed over 18.2 million homeowners have at least one currently uninhabited spare bedroom. And with the average monthly asking price at £289 per month, Britons with a spare room could raise £3,468 extra each year. What's more, those that join the Government's rent-a-room scheme, can receive up to £4,250 tax-free ‘gross' rental income a year (receipts before expenses). The Rent a Room scheme is an optional exemption scheme that lets you receive income from renting furnished accommodation in your only or main home.

Abbey Mortgages' research also showed that some 388,000 homeowners are already renting out one of their spare rooms, which is netting them combined £1.1 billion annually. And a further 1.6 million are seriously considering doing so - worth a potential £5.6 billion.

However, if you're a mortgage payer, Abbey Mortgages points out that while the vast majority of lenders allow you take in a lodger with the minimum of hassle it's always best to check both your mortgage lender's and insurer's terms and conditions.