Wise up to size

Our new obsession with square footage means some buyers are being charged for thin air

The way in which we value property has been changing in the past year or so. Blame all those foreign buyers who have been busy buying up the smartest addresses in central London, and are used to thinking in terms of square feet (or metres), rather than following that good old British tradition of counting the number of bedrooms.

So, are we setting too much store by size? Estate agents commission floor plans from specialist companies, of which there are loads nowadays, but the results vary in both quality and diligence - which could affect the value of your house. Why? Is it a wonky tape measure, wonky maths or wonky ethics?

Take my own home, a late-Victorian semi in southwest London. As a test,