[MajinDragon]

'Scroll of House Constitution+' - Very costly, makes your house last 4x longer
No reason why they shouldn't degrade, as Felix noted they help to control the number of houses on an island. Permanent storage sounds more like a bank, which we should have, atleast for plat/gems/coins. Trials earning completely protection from their houses degrading is a foolish thought. Houses don't vanish when you log out so neither should the timer, that would also mean houses simply wouldn't disappear when players quit which would lead to the possibility of there being too many on an island.