Upgrade

Upgrades

 * Increase a Buildings level, improving its stats
 * Currently limited to Houses
 * Roads have a visual upgrade from dirt to cobblestone, but don't seem to effect game play


 * Houses:
 * Increases the number of Residents a House can hold by 3 per level
 * For a complete list of House upgrades visit Housing Levels

Downgrades

 * Buildings can downgrade if they are deprived of a service that caused them to upgrade
 * For example, if you provide Well and Food and Bath House services to your level 1 Houses, they will upgrade to level 3. If you take those services away, the Houses will downgrade to level 1, and the extra people will leave