All Structures must have at least 4 blocks of floor space.

All Structures must be at least 2 blocks tall but no more than 30 blocks tall.

A roof must be used in order to create a valid Structure.

A Structure needs at least one door, more are also fine.

The interior of a Structure has to be on one y-level.

Maximum size for any structure is 500 floor spaces with the roof up to 30 blocks high.

Specialty structures will register as valid if the basic structure requirements are met, but may not work as intended if they are missing required blocks.

Structures tokens will ONLY work with the Town Hall they were generated/bought from. If you try to take some structure markers from a natural village and mix them with your village they won’t work.

Some structures have a limit of how many villagers can be in a structure without getting "Overcrowded" you can learn more on this here