I guess if Wifi doesn't pan out (it should, but just in case) then you could go wired through the mains supply... I don't know if that sort of equipment is sold in your part of the world, or is legal to own even, but some networks do connect that way. It might be a possible option.
It does save laying new cable, that is its sole redeeming feature. It can have a lot of other issues, or can work just fine, it depends on a lot of factors how effective it is.