The Ontario Building Code | Access Routes
3.2.5.4. Access Routes
(1) A building that is more than 3 storeys in building height or more than 600 m2 in building area shall be provided with access routes for fire department vehicles,
(a) to the buildingface having a principal entrance, and
(b) to each buildingface having access openings for firefighting as required by Articles 3.2.5.1. and 3.2.5.2.