I have low Pressure to kitchen sink and bathroom sinks, good in other places?

I am rehabbing a townhouse. I get good pressure from places that don't go through the hot water tank. In the kitchen and bathrooms the pressure is low. I put in a new hot water tank thinking that would help (it was rusted too) and the problems persisted. Is their a hidden reducer that needs to be adjusted. All the piping is copper. Any suggestions.