The Basis of Estimate is part of estimate documentation to record assumptions and back-up calculations and can be tailored to the project. Download a free construction estimate template in Google Sheets, Excel, or PDF format, to provide a clear cost breakdown to your client.Construction Estimate Template for contractors. Use with Excel or print a paper copy for your customers and sell more quickly. The developer shall enter the quantities shown on the construction drawings into the Construction Calculation Worksheet. Download free construction budget templates for use on residential and commercial projects, and easily compare estimates with actual costs.