Same goes for buildings – you can either choose to use preset buildings (such as windmills, warehouses, keeps etc.) or design your own multistory building square by square and build them however you like.
Free building means a you are able to construct your buildings anywhere, within reasonable limitations. Buildings can’t be placed under water, too close to other buildings or on uneven terrain. Players can build by either using predefined or modular buildings.
Predefined building means you have to select a building that a developer has already prepared from a menu, and then place it where they wish for it to got. Once placed, a construction site will appear, and progress on the site must be completed before the building will be useable.
Modular building means you are able to place sections of buildings, such as walls and floors, to create a custom building. The building must be structurally sound, and you should make sure you have enough space before beginning. This aside, all buildings will suffer decay.