A lot of cool ideas here. And yeah, Construction is not the best skill, it's cool, but it has no use, it's just a money sink. Using some of the others idea's, here's a list. Bank Chest - Just a chest in the house; can't be used in building mode. (Idea from Platinum_Myr) Skilling Add-Ons - Wasn't sure what to name this but, as Platinum Myr has said, could have items that are for other skills (e.g herblore) that can only be made in a house that are untradeable, like.. fish, weapons & armour, special herbs / plants. Underground Shafts - A place under your house (not like the dungeons) that you can build which can store killable monsters which are for slayer taks, can create minecart systems, etc. House Communities (Credit: Constrictor) - A house which multiple people can build at once, possible ideas for this could be incorporating the Skilling Add-Ons idea, making it so you need friends to create the untradeable items. So yeah, most of them are others, just a place to see 'em all.