Four heads in the front, four in the back and 1 spray zone for both sides. Don't worry if the coverage sucks, plants are in the way, mailboxes, etc. If you have some areas that don't get water, it's okay, most homeowners don't know it anyway. Yeah, about $700 in supplies and you charge $2000. If you have a slightly larger yard, just keep adding rotors to the zone. If the pressure drops that's okay too (sprinklers run in the morning and no one sees it anyway). $2000 Front and Back Yard Watering System. Get the flyers in the mailbox every year. That's the majority of the residential installs around here.