How To Write An Estimate For A Roof Job . Provide a few ways for the customer to contact you if they have questions, such as an email address and cell phone number. By entering the length, width and roof pitch you can calculate the roof’s area and the material you would require for construction. What to look for in a Roofing Estimate Rossetta's Roofing Blog from www.rossettasroofing.com The style of vent you choose, the color, and the number of vents your roof needs should be included in your roof replacement estimate. Provide a few ways for the customer to contact you if they have questions, such as an email address and cell phone number. How to make a roofing estimate.