This document provides an orientation on cost estimation of civil structures. It discusses the purpose of cost estimation as preparing projects for administrative approval and technical sanction. The objectives are to explain construction terms and units, methods of estimating quantities, schedule of rates, earthwork estimation, and steel requirements. Cost estimation is defined as determining probable costs before construction starts. Specifications, rate analysis, tenders, and contracts are also covered. The importance of accurate estimation and duties of estimators are outlined. Job opportunities for estimators include roles in construction companies, project management, government departments, and as consultants.