Texas Estimation offers affordable and accurate construction estimating services San Antonio TX. Upload plans and get free quote in 10 mins! Please fill out the form below to receive an estimate for your project.Online Estimation Form. Name. The TxDOT Construction Division posts a spreadsheet with monthly bidding results in the CST crossroads page. Need accurate cost estimates for your construction project in San Antonio? Our expert estimators provide reliable construction estimating services. A complete list of fees associated with your project, you can review the current fee schedule. Here, we provide clear and precise construction cost estimates that come with a detailed report.