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Any modification to wiring requires permission from the city. To get the permission, You need to submit the wiring diagram, and they may send an inspector to do the final check. Same thing for plumbing.
For regulations on plumbing, you could check the Ontario Building Code (97) Part 7. Electric code is a little complicated and confusing, but there's a simplified version published by Ontario Hydro. You could find all these codes at the Reference section in public libraries.
I guess these are the two major things you need to notify your insurance company. To make it save, you may want to consult your broker before starting your project.
