A building site which is in fact a small flat roof on an existing building has been put up for sale at £450,000.

In Bermondsey Street, south London, the 53 sq metre third-floor roof space has planning permission for a one-bedroom flat.

It is on with Stirling Ackroyd and seems to be another portrait of the London housing market.

Recently, ground beneath mansion flats has gone on sale, apparently offering potential for a large residential basement.

Now if you are interested in roof space, here it is.