Over the years, Grant-Marion Construction Ltd. Has acquired a noteworthy reputation as being one of the most reputable construction companies in Eastern Ontario. Founded in 1971, it first focused on the construction of energy efficient homes and soon became a pioneer in the R2000 homes initiative. The company broadened its portfolio to include industrial, commercial and institutional projects in the early 1980s. Our latest undertaking involves the integration of the LEED Green Building Rating System™.