The versatile 22-year-old has provided capable cover for regulars like Tim Visser, Lee Jones, Nick de Luca and Tom Brown across a number of roles since graduating from the Murrayfield side's youth ranks last February.
He has gone on to make 15 appearances for Michael Bradley's team and chipped in with four tries, which was enough to convince the head coach to offer the Edinburgh-born Scotland A cap a new two-and-a-half-year contract.
He told www.edinburghrugby.org: "As a local boy I used to come to the games as a fan and was even ball boy at a couple of games, so to get this chance as a fully contracted player is a dream come true, and gives me the confidence to push on to the next stage in my career.
"At the start of the season I didn't imagine I'd be involved as much as I have been, but I've managed to get my foot in the door and keep it there with a few good performances.
"I've been involved in some massive games, the derby against Glasgow Warriors and in the Heineken Cup, with each game seeming like it's the biggest game of my career. I've loved every minute of it.
"It was my goal at the start of the season to get a number of games and secure this contract extension, so I need to set some new targets, keep working hard and push for more chances to start for Edinburgh Rugby."
Bradley added: "As well as being a top young player, Dougie's a keen learner and a fantastic example of how, with the right attitude and commitment, young players from the local area will be given the opportunity to be nurtured and excel at this club."