There's some reasons for this... existing housing stock is old so requires renovation or maybe not available. People want also want bigger houses and maybe a l

There's some reasons for this... existing housing stock is old so requires renovation or maybe not available. People want also want bigger houses and maybe a little more land. So because you have the land people will use it. In places with land use restrictions or simply places that are out of room you see infilling and renovations. Schools play a big role and a lot of families want to move into neighborhoods with families in them.