[quote=CA renter]
“Type L” copper pipe, 1/2″, for the kitchen and two bathrooms in a single-story house.[/quote]
L is probably an unnecessary expense for indoor lines and non corrosive water. But in the scheme of things it is not such a big deal.
One tip: If you are running a cold water line to an outside hose bibb, make that line 3/4″ all the way. Otherwise, do everything in 1/2″. I can’t believe people run 3/4″ for hot water; it makes the hot water take twice as long to arrive at the faucet. But if you have a monster 10 gpm shower with a recirculating system then your needs are different.