Depends if your buying the business or the round.
1/ Buying a round, that is all you are buying, a list of customers.
2/ Buying a business, you are buying the established name, telephone numbers, the branding, existing advertising and web presence, retaining the staff and vehicles as well as all the good will, not just a few streets.
I would value the first at 3 - 10 times monthly turnover.
I would value the latter at 2 - 3 times the yearly profit.