Room Control Level
This article is a stub. You can help Screeps Wiki by editing to add more information.
A room's control level (RCL) determines what and how much a player can build in a given room. It only applies to owned rooms, and it can be upgraded by a creep using energy.
When a room is first claimed, it is at RCL 1. Each level takes exponentially more energy to complete, until the transition from RCL 7 to 8, which costs 10,935,000 energy.