sizing my water supply line

[Bo Greenwood]

I'm putting up a metal building next to my house that will have (1) toilet (2) sinks and (2) hose bibs - I'm tapping off of my house hose bib (which is 1/2") for the supply line - What size line should I run - 1/2" - 3/4" or 1"?

 

[havasu]

What size do you have to service the house?