Cottage
From Cantr II Wiki
This cottage is a freestanding building when built within a town's main area. However, this same cottage may be built inside other buildings, and then it is considered a room within the bigger building (Hope that's not confusing!). This could be useful, for example, so that different areas can be locked and kept private.
Construction
Object: Cottage
Days needed: 50
Raw materials needed: 50000 grams of stone
Objects: none
Tools needed: trowel