Hi! I'm from the Netherlands and thinking about doing a PhD in England.
Are PhD jobs usually for 3 years in England or is 4 years also an option?
Furthermore, are there any arrangements for foreign students concerning housing normally, or do I have to look for a place to live myself?

Thanks for helping if you got some advice!

You usually need to look for accomodation yourself. Although most universities have a limited amount of their own accommodation on offer it is generally no cheaper than private digs. Most PhD programmes are 3 years however there are more and more 4 year programmes becoming established which offer an increased taught element.