Dan, it sounds like you have the anti-scald guard fixtures. A lot of plumbers will not adjust those off of the factory settings for liability reasons. You should be able to pull the handle off & see a plastic adjustment ring that you can adjust to allow for hotter water at the fixture. If you do not feel comfortable doing this, & since you are in a new home, contact the builder & see if he would ask the plumbers to adjust it for you or at least stop by & show you how to make the adjustments.