It has been a house rule in my group for so long that I had forgotten it was a house rule, but I generally use "High Average" HP instead of rolled HP.  So instead of rolling you take the the rounded-up average die roll at each class level:<br/><br/>d6 = 4 hp<br/>d8 = 5 hp<br/>d10 = 6 hp<br/><br/>If you prefer to roll that's fine.