mcCallumSather is a Canadian-owned, multi-disciplinary firm specializing in architecture, mechanical engineering, and interior design. Known for its commitment to sustainability, innovation, and collaboration, the firm creates built environments that respect the earth and stand the test of time. With offices in Hamilton, Kitchener, Toronto, and Kincardine, mcCallumSather is led by a senior leadership team passionate about intelligent design, community impact, and lasting partnerships.