Construction and engineering combine to deliver built facilities and infrastructure through integrated design and construction processes. Engineering develops designs, specifications, and documentation enabling construction, while construction executes physical work installing equipment, structures, piping, and systems. Effective integration between engineering and construction improves project outcomes through constructability reviews during design, contractor input on execution approaches, design modifications addressing field conditions, and systematic communication resolving issues.

Delivery methods structure engineering-construction relationships differently—design-bid-build separates design and construction, design-build integrates them under single entity, and EPC combines engineering, procurement, and construction comprehensively. For fabrication-intensive projects, early fabricator involvement in engineering enables design optimization for manufacturing efficiency, realistic cost estimating, and fabrication planning supporting construction schedules. Construction feedback to engineering improves future designs, creating learning organizations continuously improving project delivery.