I am going to wire a 3 car garage attached/workshop, but can find very little info on what is required to meet Canadian Electrical Code. The garage will be supplied with a 240v, 70amp sub panel. Are appliance type recepticles required if they are above counter height? Can more than one garage door opener be on a single circuit and could these be supplied from the main panel in the house (150amp). I will be using GFCI recepticles outside and within 5' of a sink. Are there any other things that need to be considered. Thanks for the help.

No expert with the CEC, just NEC, but they are similar, with subtle differences.

All garage outlets need to be GFI here. Good idea for you to consider.

They can be 15 or 20 amp, CEC may limit them to 20 amp. Good idea for a garage.3

Door openers can be on the same circuit, they are usually small, and rarely run at the same time.

If this garage is commercial, then all bets are off, as here there is a separate NEC section much more strict than for residential.

This is a private garage/workshop. Are the GFI circuits limited to 2 outlets as they are in a kitchen?

No, not here. Kitchen circuits are dedicated for small appliances, coffee pots, fryers, toasters, all heavy loads, all close to a sink.

Garages are general purpose, small tools, and there is no limit to quantity, but since the concrete is grounded very well, all need to be GFI for your protection.

If many tools or large tools will be used, then a wise person will install more than one circuit, esp for large loads.