The pair have both signed new two-year agreements with the Broncos that will keep them in a Broncos' jersey until at least the end of the 2016 season.
Both have been at the club for many years, with Maranta being born into the Bronco family.
The grandson of original Broncos' chairman Barry Maranta, the 22-year-old outside back is currently in the best form of his career.
Wallace, also 22, has cemented his position in the Broncos' top team this year, playing in the prop rotation every week.
Both players said despite outside interest, they were always going to stay at the Broncos as they spy a bright future for the club and team.
"The Broncos and coach Anthony Griffin were the ones who gave me the opportunity to train as an NRL player for the first time," said Wallace.
"They feel like family to me.
"We have a relatively young side here mixed with some older players and I can see some potential to do some good things over the next few years."
Maranta's family ties run deep and it was something he said had played its part in re-committing to the club.
"I am really excited to be here for another two years," he said.
"It has been awesome around the team this year, there is such a good feel getting among the group.
"Obviously that was a big thing in my decision to stay and it is obviously good to stay in your home town."
Coach Anthony Griffin said the signings were great news for the club as a whole.
"As a club we are pleased to be able to secure both Jarrod and Lachlan for the next chapter of their careers," he said.
"They have shown this year that they have the ability to be long-term NRL players.
"They will be a part of the future successes of this club."
Both players have been named in an extended squad to take on the Sea Eagles at Suncorp Stadium on Sunday afternoon.Like