You should have a receiver with at least 2 zones.
Zone 1 is the surround sound system.
Zone 2 will be for the other speakers around the house.
You will need a speaker selector with impedance matching if you didn't plan for impedance matching volume controls in each room.
If you want more control and the ability to play different things in each area of zone 2 you will need more gear.
I would consider a Denon or Marantz receiver that is compatible with their Heos distributed audio system. That would allow you to expand the functionality over time when and if you chose to.