Why are house size locked by lots?

[Dustytome]

As Meraii said, the plot sizes themselves are different, they'd have to remodel the entire zone. It's not just the appearance that would change though as large plots also allow more furniture so you'd essentially be increasing the outdoor furniture loading in each ward from 450 (900 if subdivision furniture is loaded too) to 1,200 (2,400 if subdivision furniture is loaded too).

This means a zone of 30 houses would end up with 15 small houses, 10 medium houses and 5 large houses (the actual amount may vary from this).

20 small, 7 medium, 3 large per map.