Morgawr I will try explain it as this was some thing I wasnt clear on to begin with.
Each UO
account you have can hold ONE home only,on ONE character,.on ONE shard.You cannot have a house for each character,nor can that account have homes on different shards.
[The only exception to this is if you create a character on the Test Centre,where you can place a house]
When people buy a boxed UO game,you receive 1 account game code.However on the reverse of the box is another game code.Each code, needs to be paid for however.
Often players never activate these codes,and therefore Nevaeh is offering you one of her 'unused codes' [ I think

]
If you want to hold another building,you have to open a second account,even if you are not active on that account.
As long as you pay for both accounts ,both houses will stay .
Hope that helps ?