Both on the hot side by accident?

More than likely your plumber put in a rough in valve for the shower and either did not close one of the isolation valves, or it doesn't have any isolation valves and the valve is open with the shower head capped. This allows water to cross freely back and forth across the cold and the hot anytime water is used of either temp anywhere in the house, thus tempering your water throughout. Your water that is roughed in for the lavatory and toilet will not be warm as the water is not physically being used through those pipes and will not change the temperature of the lines themselves. Notify your plumber to check that this is what is going on to correct this and to also check and make sure it is not a physical cross- just as a precaution.