There’s a buzz in the air at construction sites around the country, and it has nothing to do with power saws.

The use of drones, or unmanned aerial vehicles, has exploded in popularity, with the Federal Aviation Administration estimating that by 2020 there will be around seven million drones sold for hobbyist or commercial use—a nearly threefold increase from 2016. Among commercial drones, the construction industry leads all sectors with 239 percent growth in industry adoption year over year, according to a global report.