Legislative Assembly of Ontario Building

The Legislative Assembly of Ontario is Canada’s foremost example of Richardsonian Romanesque architecture and a building of national significance.

Since 1990, +VG Architects has led a multi-decade conservation program, beginning with a comprehensive Conservation Master Plan and continuing through successive phases of renewal, maintenance, and upgrade.

Initial work focused on large-scale building envelope restoration, including replacement of over an acre of slate and copper roofing, conservation of more than 600 historic wood windows, full mortar replacement, and significant sandstone repair. All work was completed while the building remained fully operational as Ontario’s seat of government, requiring rigorous coordination and strict health and safety protocols.

Subsequent phases expanded to include mechanical and electrical upgrades, foundation conservation, and interior improvements, alongside a structured cyclical review program to guide ongoing maintenance. This proactive approach allows for continuous monitoring and targeted interventions to preserve the building in a state of good repair.

More recent work has focused on masonry, window, and metals conservation, incorporating evolving best practices and lessons learned over time. The program also includes landscape rehabilitation and accessibility and security upgrades, ensuring the site continues to serve both its civic function and heritage value.