GOING UP

LOFT EXTENSIONS: Experts agree the biggest money spinner – and the least disruptive option – is to extend your loft.

COST: The cost depends on the project but Brian Berry of the Federation of Master Builders (fmb.org.uk) says a loft extension will cost about £35,000 in London.
4/5

RETURN: Brian says that a loft conversion can add up to 20% to the value of your home. He calculates that investing £60,000 on a loft for a three-bed house worth £600,000 might push its value up to £750,000 – more than doubling your investment.
4/5

DISRUPTION: A loft conversion will take two to three months depending on the scale of the project. Kurt Calder of the national Federation of builders says it is the least disruptive option.
5/5

PLANNING PERMISSION: Recent changes to planning rules mean many people can extend into their lofts without planning permission, but always check with your local council.
5/5

WOW FACTOR: Creating a large master bedroom and en-suite in the loft is the most popular option but wont add a great deal of architectural merit to your property.
3/5

SCORE: 21/25