The club's 2012 'Iron Man' - appointed by the strength and conditioning staff for commitment to the jersey at game time and in relentless preparation - is renowned for the back-row scavenger and ball-carrier role which have made him a mainstay in the pack and firm fans' favourite.
The 12-times capped Scotland A internationalist has started 71 of his 87 appearances for the club since impressing on his debut against Ulster in 2009. His new contract is set to take him past the five-year mark as he sets his sights on joining an illustrious group of Edinburgh Rugby centurions.
He said: "I'm really happy and proud to be re-signing with my club, Edinburgh Rugby.
"This season has been difficult and disappointing from a performance perspective but there's a real sense of urgency among the players and the club to finish this season strong and start the process of getting back to where we believe we can be.
"Edinburgh Rugby is my club and I do everything I can, on and off the pitch, to help drive things on, and am excited about what we can achieve in the next two seasons.
"There are some great young players coming through the ranks and bursting on to the international scene. There's huge potential.
"I'm still looking to improve my own game and feel that Edinburgh is a great place to do that alongside some great players in a good environment, and in the shop window for Scotland selection, which is obviously a huge goal of mine.
"But first, as a team and a club, we need to rectify an unacceptable season. It's a real challenge and great source of motivation, it's something I care a lot about and am delighted to be part of it for another two years."
Born in Bostwana to Scottish parents, Grant has a distinctively Scottish rugby heritage.
Both his maternal grandfather (Bob) and great-uncle (George) were international referees, the latter also Scotland full-back in 1950 and 1951, and manager of the 1977 British Lions tour of New Zealand.
The former club and Scotland 7s captain was named Edinburgh Rugby's 2010/11 Young Player of the Season and was nominated for the PRO12 award the same year.
Although ruled out for the rest of the season with a wrist injury, forwards coach Neil Back - a former Rugby World Cup winner and British Lions open-side - believes that the best is still to come from Grant, who will return in time for pre-season.
He said: "Roddy is an excellent player and person to have at the club. He is very popular with the fans and contributes a great deal to the club, on and off the field.
"He has an exceptional attitude towards his preparation, is a model professional and fantastic role model to other young Scottish players coming through the system.
"He's extremely competitive on the field of play and always gives 100% for the Edinburgh Rugby jersey."
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