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I am extending supplies into an extension. Currently hot water is on dia22 and cold on dia15 from rising main. Should I continue to use the same dia pipes all round the extension or use 22 or 15 for both hot and cold, or does it make no difference? I also want to add a rad. I want to use...

I am renovating an old cottage attached to my house. I am going to supply water by tapping off the existing supplies (no problem) but I am a complete plumbing novice and don't know what to use to continue the supply around the renovation. Should I use PB, PEX or copper? I need to go around...