Will building sites be run by robots?

The building site of the future is going to look very different to the one we are all used to today. Instead of men in high-visibility jackets and hard hats, there are going to be drones buzzing overhead, robotic bulldozers and 3D printers churning out new structures. That at least is the hope of those making technological solutions. But first they have to convince the traditionally risk-averse construction industry that such change is necessary. US start-up Skycatch is using drones on some high-profile building projects - although it cannot name them because of commercial sensitivity.