As Not-Z says, you are not restricted to your house map. You are actually encouraged to play in all of the maps so don't get hung up on the home map thing. See which house best suits your style. Take some time to think about it. Better to be independant for a while than to jump from house to house and injure our tender pride.
Some of the houses have adopted maps. The break down is something like this:
Dam Busters Strand
Foreign Legion All maps
Hell Hounds Flash
Imperial Guard Avalanche
Raiders Donner
Reservoir Dogs Flash ( I think? )
I don't think there is a formal listing but this will get you started. I'm sure the members of the other house will take great delight in correcting any errors I may have made.