Hello all, this is my first time posting a thread here. ^^
I had a few ideas/suggestions that I thought wouldn't hurt to post here and I wanted to see what you all thought.
Forgive me also if this has been posted before.

As we know, currently we have small, medium and large houses.
This is my expansion on a topic that I know has been asked before and was rejected due to them saying they would have to change the housing districts and plot sizes.
What if we could upgrade the size of what would mainly be the interior instance of our houses instead of also the exterior? (where they say most of the limitations would lie)
My thinking goes as follows:

Small houses: The outside of the plot is what makes me think expanding it wouldn't work/make sense.
So instead I propose the idea of giving smalls an upstairs/attic area.
It would be the same size as the ground floor but also no outside editing would be needed as some roofs already showcase there could be an upstairs area to it.
This would be optional, of course and an upgrade option to pay for with gil.

Medium houses: I believe medium houses could make sense for a large house sized interior instance due to it's outside size.
You wouldn't have to edit the outside much to make sense, at least in my opinion.
The most you could do would be to add a balcony to it and it would still be fine.
But no garden item limit increase as the pay off.
This optional upgrade could cost as much as a large or about 30m to add onto the price you originally paid for this medium house. (larges at their most expensive, i believe are priced at 50m while mediums are 20m ^^)

I don't have anything special to add for large houses as I have personally never owned one.
But this was also honestly a suggestion to add on as large houses are quite rare to come by on a lot of servers.
I believe this could give so much more customization options for house owners and also make smalls and mediums more appealing in general.
Feel free to add on suggestions or discussions on this below!