The Legislative Assembly Building is the first and finest example of Richardsonian Romanesque architecture in Canada and is of national architectural and historic interest.

In 1990, a conservation plan, led by +VG Architects, was implemented over the next six years. The exterior conservation was one of the largest and most sophisticated stone conservation and roof refurbishment projects ever undertaken in Canada. The project was completed within 3% of estimates prepared at the out.set of the job.

The construction involved scaffolding of large sections of the building for each phase. The scope of the project included replacement of over an acre of slate and copper roof. It required the removal and restoration of over 600 historic wood windows, removal and replacement of all the face mortar and removing and replacement of over 17,000 cubic feet of sandstone. It also involved interior work, as the roof drainage system (cast iron risers buried in the interior walls) had to be replaced in its entirety.

Ordinarily this scale of project and type of construction work would be executed on an unoccupied building. This was not acceptable to the client and the building had to remain fully operational throughout the six year construction schedule. This challenge was compounded by the serious occupational health and safety risks involved with continuous noise, silica dust, volatile organic compounds in paints, caulking materials, lead dust from mortar removal, and pigeon droppings that constitute hazardous material. Stringent safety procedures were set-up and monitored on a continual basis.

The LAO building is presently in its fourth year of a five year masonry and window conservation program which involves analysis of previous conservation activities and continued conservative maintenance.


Toronto, Ontario




575,000 ft²


Conservation & Various Upgrades


2023 Crafts & Trades Built Heritage Award
(North Coat of Arms Conservation)
Heritage Toronto Awards

1995 Award of Merit
Heritage Toronto Awards