Our haunt is in a "warehouse" style building but the first half of the building has drop-ceilings so the 8ft walls aren't too much of an issue with sound and light bleed-over. The way the second half of the show is, again, the light and sound aren't issues. We have different audio in each room thanks to our control booths throughout the haunt and as screamforadream said, other noises from the show cancel out sound from different rooms. You can also angle your speakers in a certain way to prevent projecting sound into other rooms.
...this year we are planning on upgrading our light & audio using Scare Products systems. Despite the equipment upgrade, we'll still be using the same "control booth" style set-up. Hope that helps!!! Best of luck with your new start up.