To start planning a structure, activate a [[mallet]] or [[iron hammer]], right-click a [[tile]] and select ''Plan building''. You can extend the wall plan by additional tiles, depending on your [[carpentry]] skill. Each tile and each piece of wall needs 1 point in carpentry.
To remove a wall plan from a tile, right-click the tile and select ''Remove plan here''. A wall plan without any walls attached will generally decay within 24 hours.
The [[maximum slope]] you can plan buildings on is a [[slope]] of 8 dirts.