MISSISSAUGA, Ont. — Castle Building Centres Group members are growing locally. The most recent is Peterborough, Ont.-based Alf Curtis Home Improvements, which will open its third Eastern Ontario location, this time in Belleville. Founder Alf Curtis first opened in Peterborough in 1975 and erected a second location in Lindsay, Ont., in 2005. This new store follows the news earlier this week that Kindersley Building Centre in West-Central Saskatchewan also joined Castle recently.