Housing not being built

[yanivtal2003]

I mark large enough areas for EU Medium Housing, but the housing is never built, and my residents don't have homes, no matter how many I try to build. It just never starts.

Please, help me

[shaneturner12]

What is the demand bar showing for that particular zoning type? I also advise checking the suitability for that type by looking at the network colour with medium density selected

[yanivtal2003]

I'm not sure I understand either of those questions.
The EU Medium Density housing is the highest level housing I have, and I selected a good amount of land to become EU Medium Density Housing.

What Network color?

[kenh]

When you select a particular zone in the menu, the roads are green if that density or type will grow and red if that place is unsuitable in which case no buildings will spawn.