This one seems simple enough, and maybe something already possible that I’ve overlooked - or already suggested, likely
But I’d really, really like to be able to change building plans without having to start over, particularly in regards to doors and windows…
A simple “delete” function would also be really nice, seeing that the “undo” can be a bit relatively limited
unless i totally misunderstood what you wanted, you can actually already use the “eraser” tool, in the slabs/floors part of the building UI, to remove doors and windows 
kinda sad that when they changed the building UI they didnt include the eraser in all sections of the UI…
That’s coming…soon.
You can! See, this is why I put in the possibility that I overlooked something. I loves you crabby one!
@brad Does that mean, like say we build a build and want to add a door to existing wall We will be able too?
@micheal_handy76_mh At first, we’re looking at being able to make adjustments during the building process. This means that – prior to pushing the Big Build Button – you can change the placement of doors, windows, and other items (such as wall-mounted lamps). This will be useful for people who want to modify either standard or custom (saved) building templates.
We haven’t yet looked at being able to modify already-built structures (for example, putting a door in an existing wall)… but we shall see.