Ottawa's OC Transpo's seventy-five new low-height Enviro500 double deckers(#8001 to 8075) have started to be delivered - thirty-five were in service as of mid- November and delivery is expected to be completed by April 2013, with an option to purchase forty more still to be exercised.

These new double-deckers are 12.8m in length, 4.14m height (13ft 6) in order to get exempted from MTO (Ministry of Transportation Ontario) regulation.  Every vehicle with clearance more or equal to 14ft has to obtain a special permit from MTO in order to run in Ontario, Canada. The fuel tank of these buses being relocated and actually placed above the 3rd axle, right behind the last row of seats, and the secret door behind the fuel cap on the door side is the access to the maintenance area for the engine/air tank and fuel tank

Upper deck level clearance remains the same, the reduction of 6 inches is reflected in the lower deck (as expected). Because of this, the a/c duct/vent originally placed at the centre of the roof beside the staircase, have to be moved to the sides in order to yield more clearance out. The whole cockpit has dropped by 6 inches, which means it's "closer" to the ground, but remains the same clearance/space as the three pilot buses #1201 to 1203

Owing to the drop of the cockpit, the battery/wiring/electric panels originally placed underneath, have been split and some of them were moved underneath the staircase, which explains the extra "openable" panel behind the front axle, underneath the staircase

The 3 pilot buses #1201 to 1203 with 14ft clearance (4.27m), have been sold, their current status remains unknown but rumours that BC Transit, Victoria has purchased them.

GO Transit of Toronto, Ontario, has purchased twenty-five low height Enviro500s and these buses (#8100 to 8124) have started to be delivered in mid November, with an option to purchase eighty more, which has yet to be exercised. These feature coach seats and suburban configuration with single door (plug type door)