Property consultancy Knight Frank have developed a 3D tool called 'Skyward' which analyses Ordnance Survey and Land Registry data to identify buildings which are suitable for rooftop development.
Skyward has found 23,000 buildings in zones 1 and 2 which could potentially provide as many as 41,000 new homes.
Charles Dugdale, residential development partner at Knight Frank, said the research allowed for the first time a comprehensive look at where there were opportunities for rooftop developing.
“It’s very common for someone to extend on to the roof and there are a number of specialist developers across London working particularly with modular homes to build off-site and then move the structure in,” he said.
“What we’ve lacked up until now is a way of mapping all the places where this is possible.”
He added that developing on the tops of existing properties could provide a way of developers funding improvements to the rest of the building.