Oh, wait I should have written that down, Saltypaws.
It was made in 5 minutes so it isn't very detailed yet. Maybe I'll alter it when I have some time.
The corridors are usually 3-4 'boxes' (you know, those on the floor when in building mode) wide. Since there are corridors all around the house there will be no traffic jam, even with 8 people in one household.
Leto:
Yes, I am aware of that. Usually I use double doors; it looks quite nice and it is practical too!
The proper translation in Dutch of the word 'corridor' would be 'hal' or 'gang'.