In this article, you will learn about the different types of project proposals, what makes a good project proposal, and the basics of how to write one. Fill out and return to the Harris County Purchasing Department ONE (1) complete proposal form in an appropriately sized envelope or box.Below are the original certified taxable property values since 2014 and the amount of new construction added to the tax roll each year. 2014. Download our free budget proposal template for Excel to capture the financial dimensions of a possible project and determine if it's worthwhile.