Unless you have technical qualifications and a lot of experience, there are some renovation projects and types of work that you are better off leaving to the pros. These are the ones that involve safety risks for you and your family, and it is better to let a professional to do the work.
Plumbing, electrical and gas repairs and installations
Depending on provincial regulations, a licensed contractor may be necessary by law. Make sure you know the rules where you live. For the sake of your family’s safety, work involving electricity and/or gas service should only be done by a qualified and licensed contractor. Because this type of work can result in a safety hazard if done incorrectly, permits are usually required.
Roofing or other exterior work involving heights
These projects require proper safety equipment that must be correctly used. If you don’t have such equipment and know how to use it properly, don’t take chances — hire a pro.
You should always use a professional for this tricky project, and provincial laws likely require it. Don’t risk your health by doing this work on your own.