We've found, through crunching the numbers in our backend, that our homeowners generate an average of $850 per month. An extra monthly stipend like that can go a long way for any household – even those who are leasing, but have their landlord’s permission to rent out a spare room. Naturally, the amount you can earn will depend on a number of factors, such as the size of the room and the home, how much shared space you’re allotting to a potential roommate and the desirability of the location.