Last month's byelection winners, Joe Trasolini and Gwen O'Mahony, took the oath of office during a swearing-in ceremony Wednesday.
Trasolini won in Port Moody-Coquitlam, a seat held by former Liberal cabinet minister Iain Black and O'Mahony took Chilliwack-Hope, a seat held by long-time former Liberal cabinet minister Barry Penner.
Both Penner and Black left the Liberal government to pursue private sector opportunities, forcing the byelections.
New Democrat Leader Adrian Dix says both members have a lot of experience in areas such as municipal administration, business and front-line services to strengthen the NDP caucus.
The current standings in the B.C. legislature, with just a year before next provincial election, are Liberals, 46; NDP, 36; and three independents.