Lots of work like that out here on the Plateau, west central Texas. Most of my customers are rural on acreages around 5-200 and homesite trees require a bit more care than the outer forested areas. Prices I charge reflect the higher value trees needing a bit more care than the outer ones - which when they want clearing done I can use heavy equipment or quickly prune with a helper driving the tractor with me in the bucket (lower limb clearing or push-overs then pile-ups).
Straight climbing is a given hourly rate (or assumed total if hours are calculated correctly) and using the tractor and chipper is always a bit more (adding a helper charge). Fence builders, field mowers, and straight tractor work here brings a minimum of $75.00 per hour (we're a cheap area). Climbing I go for $32.50 which would include the clean-up, one man (me). All other arbo work (cabling, feeding, surgery) is cost-plus. I would break-down the differences instead of a flat-fee for the area if I were you. Keep the overhouse trees at your pricing standard, but bid or suggest a flat-rate for the perimeter trees. If you can secure equipment for clearing, calculate the cost of equipment per day with labor plus a safe pad in the event something goes wrong. There are no minimum standards unless you can take advantage of foreign labor with crappy tools. Don't undersell yourself, clearing can beat the heck outta you and your equipment. If they think they can hire someone with a pick-up and a chainsaw for $20.00 they'll get what that brings. Months of work and high liability.
