The Room to Let is a furniture you can build (the Outdoors page).
In-game description
A little sign: a room for a settler. Set it just outside the door of a proper house (walled, roofed, a door) with a free bed, within your Goddess's land, and someone may come to live there.SHOWN IN THE BUILD RING
Building it
It costs 3 
Wood, 1 Earth 1 Wind spirits. Take it down with DISMANTLE to get its cost back (see Building).
