Different buildings have different footprint sizes.

Housing is 4x4, with the building itself taking 2x2 and the "yard" or "stage" taking up the rest of that area. The "visitor's track" (taken by the canned animations of the tax collector and the man with a sack looking for a house) can be set to the west or the south, which will advance 2 spaces and then return.

7x7 Dock

7x5 All Baths

6x6 Resource producers (Mill, Quarry, Mine and Rare Goods Pit), Royal Hall, All Temples

5x5 All Courts

5x4 All Academy, Town Restaurant, Royal Workshop

4x4 All Housing, All Towers, All Farms, All Pastures, All Market, Royal Sanctuary, Blacksmiths