Never give a quote, without seeing the property. Even using findlotsize.com or Google earth doesn't tell the tale. You simply can't see undulations and slopes, from an above image. Furthermore, you want to get a feel for the place. Is there dog feces, toys, debris, etc on the property? If you meet the customer, how do they come off? High-end or large properties aren't a guarantee of a good fit, customer-wise.