Building Supply Chains

A building’s completion depends on components sourced, fabricated, delivered, and installed in sequence. The longest-lead item can govern the schedule even when other work is ready. Identifying procurement needs early is therefore part of design and construction planning, not an activity that begins only after drawings are complete.

Lead times enter the building schedule

Explicit illustrative procurement network. Steel and glazing fabrication start together; framing waits for steel, envelope waits for framing and glazing, interiors follow envelope, and closeout follows interiors. Durations and quantities are stated assumptions, not a forecast of an actual project.

Elevators are one example of equipment whose fabrication timeline can affect the project path. Prefabrication shifts some assembly from the site to a factory, but it adds transport limits and lifting constraints. Both choices move work among different parts of the supply chain rather than removing the dependencies.

Lead times and prices vary by supplier and market. The schedule and budget should state their assumptions instead of treating historical durations as guarantees.