How To Write A Estimate Letter . The date of the estimate generally appears directly above the customer’s information. The template should contain a table or a bulleted list for parts, descriptions, quantities, costs, and totals. Sample Bid Proposal Letter Collection Letter Template Collection from simpleartifact.com Check out 2 ways to write an estimate below! When you ask for an odd number it shows that you have carefully evaluated the proposal of the supplier and considered your budget. Clearly and correctly tally up the total costs of the project.