The !cost command provides information about items that can be build in your house. It gives you the experience, level and number of planks/other supplies that the item requires for building. It also returns the price needed when using marble or magic stones.

Usage:
!cost <item>

Example:
<Manacit2> !cost demonic throne
-RuneScript- *** [ COST ]: [Demonic Throne]: Level: 99 | Exp: 25,000 | Requires 25 magic stones (24.375 million gp) [tip.it]