Every construction type has a maximum allowable building area. Hit the limit and you need a fire wall — which is expensive. Sprinklers multiply that limit. The orange bar shows how much of your allowable area comes only from the sprinkler bonus.
Purpose: flag when sprinklers are the only reason your building is legal. That's a dependency worth knowing. Click any row for details.
| Type | Allowable area | Buildings | Used |
|---|