A Sawmill is a building that can be placed on field tiles after the Mathematics technology has been researched. It gives +1 population to the city it is built in for every adjacent Lumber Hut, no matter if it was built before or after the Sawmill.
It costs 5 stars to build a Sawmill.
Each city may only contain one Sawmill.However, sawmills can be built off of enemy lumber huts which lowers population! Watch out for enemy lumber huts.