Plumbing experts typically recommend that you have either copper or PEX (cross-linked polyethylene) pipes in your home when installing new pipes. So, if you're looking at doing a major plumbing renovation, consider upgrading your existing pipes to these materials, making sure that you use a qualified plumber for the service.
Copper is an excellent choice for piping because it's highly durable and resistant to corrosion. PEX is another great choice because it's more flexible than copper pipes and it better resists cracking and freezing temperatures. Plus, it's resistant to corrosion, much like copper, without the potential for hammer issues.
When it comes to the common sizes for piping for a water line repair in Courtice, you're looking at 3/4 to an inch in diameter for the main supply branches for a city line, while residential plumbing lines are typically in the range of 1/2 to 3/4 of an inch in diameter.