Blender has a way to select Edge Loops or Edge Rings, but not for Verts or Polys.
That said, if I want to select a few rows of adjacent polys, I select an edge in each row that would be affected, go to Select > Edge Rings, switch from Edge selection to Vert selection (a click of the appropriate button) so that all the Verts attached to the Edges selected are also selected, and lastly I switch to Poly selection, and all the polys in the affected rows are selected. I've tried going from selecting the edges straight to Poly selection mode, but that doesn't work. In Blender the Edges and Verts interact together, so if I go from Edge to Vert, and THEN to Poly, I'm successful.
THAT all said, I would only do that for small areas, especially where another part of the mesh is blocking an easy selection of the Polys I want. Otherwise I just select the whole area I want to UV, for instance a whole wall, and go into the UV Editor and set it up and export the layout.
Needless to say, I've not undertaken modeling a whole house, so haven't got any advice as to how to do it, though separate layouts may be the best way to go, say one for each room for the interior.