On the incentive aspect, I think am not best suited to answer that, but in regards to the legislative aspect, I would point out that in the life of a house there are many mini-steps. You need to change the windows. Sometimes you want to enlarge your house and you have to do a major retrofit. A province could, if they wished, adopt it, and with a retrofitted house, when they issue a permit, they could ask one day that the code be respected.
Phil, do you want to add on this?