It would be a great feature, but I wouldn't get your hopes up. The housing zones would have needed to be designed from the ground up with this in mind, which they weren't. Many small houses are clustered together, there just isn't enough room to allow for expansion.

I also believe each free company can only own a single house at a time, though I have seen some companies split for the purpose of owning more and then using a linkshell to communicate instead of the usual free company chat.