Hi I'm a qualified plumber from Scotland and came to Canada two years ago. So before arriving in Canada contact the college of trades and get your proof of work experience which can take time. Once you get that you will be given a 3 month provisional plumbing license and then you will have to sit your red seal interprovincial exam. The plumbing is quite a bit different here and takes a lot of getting used to. I looked many times for answers on the internet but found little so just thought I'd put this up and if anyone has any questions feel free to fire away.