McPeake was part of Team Wellington's 2013/14 ASB Premiership squad, although last season's highlight was his short-term loan to the Wellington Phoenix, where he was called in as cover for the A-League club's October 13 home match against Brisbane Roar. He was also part of Waitakere United's 2014 Oceania Champions League squad.
Coach Peter Smith said the signings speak to the very character he wants to install in the side.
"Successful sides are built around strong defences and that's what I'm trying to build here at WaiBOP United.
"Both Fergus and James will bring quality and strength to our defensive structure and, even though they're both still fairly young, they will be strong characters and influential within this season's squad. I'm looking forward to working with them during the season."