Does anyone know the legal age when children are expected NOT to share a room? Or what the councils law is on room entitlement?

Well, if you are in the States there are no laws about it. The only exception may be under foster care regulations. But for biological families there is no law. Use your best judgment. Some people simply can't afford for each child to have their own room. That is not a crime.

Well from what I understand kids can sleep in the same room till about 5-6 but can't sleep in the same bed. I have kids myself!

does anyone know the legal age when children are expected NOT to share a room? or what the councils law is on room entitlement??
In California kids can share a room until they move out if that's what the parents decide but they can't share the same bed. Although the recommended age is 13 for girls to stop sharing 15 for boys and boy girl combination is 6 or so I read

There are no federal laws that kids are entitled to their own personal bedrooms. It really would depend on what state you are in, the age difference in children, and the gender of both children.