The rent for the place you stay will form a fixed and major part of your budget in the UK (apart from your tuition fees). You can seek accommodation from the university you plan to attend, or look for private accommodation outside. University accommodation usually includes the price of internet connection (if available), cost of basic utilities (like electricity, gas, and water), welfare support staff, 24-hour security and personal possessions insurance. Private accommodation can be more expensive than most university accommodations and it is wise to look for accommodation close to campus if you plan to stay outside so that you will not have to spend on travel. Take help from your university's campus-based service which will help you find affordable private accommodation, if available. Some residential halls or apartments may require one month's rent as deposit, which will be returned when you leave. The cost of any damage or repair will be subtracted from the deposit. Again, please note that monthly expenses in UK will vary according to the location of your university.

As a single student living in the UK, the average weekly budget including rent should be approximately £240.89 ($317.92 USD). You can certainly live off of less/more than that depending on the flat you are renting, with an average of £12,000/$15,000 USD per year (excluding tuition fees).

As part of the new visa requirements, if you are an international student, the UK Border Agency (UKBA) requires you to have a budget of at least-
£1,334 per month (for up to 9 months) for courses in London.
£1,023 per month (for up to 9 months) for courses outside London.
It is just an estimate, and the final costs will vary depending on your lifestyle.
 

As far as living cost in concerned, it totally depends on person’s lifestyle, habits, location of the accommodation but on an average cost of living in UK for international student is between GBP 1100 - 1300 per month. It is just an estimate and it can be less or more depending on your lifestyle.