Just though you guys should know how i am doing my houses for Sim Rome. I am basing it off CivCity: Rome
Shack (1 Room - 1 Floor) = Wood Only
Small Hut (1 Rooms - 1 Floor) = Wood Walls, Thatched Roof
Medium Hut (2 Rooms - 1 Floor) = Stone Floor, Wood Walls, Thatched Roof
Large Hut (2 Room - 1 Floor) = Stone Floor, Clay Walls, Thatched Roof
Small Hovel (3 Rooms - 1 Floor) = Stone Foundation, Clay Brick Walls, Thatched Roof
Medium Hovel (3 Rooms - 1 Floor) = Stone Foundation, Clay Brick Walls, Wood Support Beams, Thatched Roof
Large Hovel (4 Rooms - 1 Floor) = Stone Foundation, Clay Brick Walls, Wood Support Beams, Tile Roof
Small Insula (5 Rooms - 2 Floors) = Stone Foundation, Clay Brick Walls, Wood Support Beams, Tile Roof, Wood Stairs
Medium Insula (5 Rooms - 2 Floors) = Stone Foundation, Clay Brick Walls, Wood Support Beams, Tile Roof, Wood Stairs, Wood Shutter Windows
Large Insula (6 Rooms - 2 Floors) = Stone Foundation, Clay Brick Walls, Wood Support Beams, Tile Roof, Wood Stairs, Wood Shutter Windows
Small Domus (7 Rooms - 2 Floors plus basement) = Stone Foundation, Clay Brick Walls, Wood Support Beams, Tile Roof, Stone Stairs, Wood Shutter Windows, Internal Plumbing
Medium Domus (7 Rooms - 2 Floors plus basement) = Stone Foundation, Stone Walls, Wood Support Beams, Tile Roof, Stone Stairs, Wood Shutter Windows, Internal Plumbing
Large Domus (8 Rooms - 2 Floors plus basement) = Marble Foundation, Marble Walls, Tile Roof, Marble Stairs, Wood Shutter Windows, Internal Plumbing
Villa (8 Rooms - 2 Floors plus basement) = Marble Foundation, Marble Walls, Tile Roof, Marble Stairs, Wood Shutter Windows, Internal Plumbing, Mosaic Floors, Fresco Walls
Palace (9 Rooms - 2 Floors plus basement) = Marble Foundation, Marble Walls, Tile Roof, Marble Stairs, Wood Shutter Windows, Internal Plumbing, Mosaic Floors, Fresco Walls, Throne Room
So if you guys want to use a similar method feel free.