We have used a pricing model of .01 per sqft and measure the property of the tax map for a pre estimate and a measuring wheel during the site assessment. Add money for a hill, fence, extra trees to edge around. Also, if lawn is overgrown, $15 extra charge. (not much, but enough to maintain the profitability for time spent). This pricing strategy has been profitable for a couple years now. Also adding fertilizing .09 per sqft, aeration .03 per sqft and dethatching .08 per sqft upsells to those customers is a huge profit boost. (located in VA.)