As I recall you can buy a Lairdship for added grandeur.
Lawl - were you looking over my shoulder at lunch?!

Anyway appears there's nothing stopping us calling it whatever we'd like.
In "good taste" though we're going to stick with the name the house was originally given and make sure to leave the number as visible (if not more) on the outside of the house.
I don't think we'll actually use it on anything but will look nice on the original wrought iron gate

We think it's pretty fitting of it's name "Arden House"