Pre-construction is used in the planning of a construction project before the actual construction begins. These services are also referred to as precon services and include estimating, design decisions, evaluations, studies, value engineering, scheduling, and more.
Design-Build is a method to deliver a project in which the design and construction services are contracted by a single entity known as the design-builder or design build contractor. It relies on a single point of responsibility contract and is used to minimize risks for the owner of the project.
Oversees the planning, design, and construction of a project, from start to finish. The purpose of construction management is to control a project's time / delivery, cost and quality.