Why preconstruction decides the programme

A construction programme is only as reliable as the information it is built on. When design packages are still open, long-lead items unordered and site logistics untested, the programme is a statement of intent rather than a plan.

Preconstruction is the period in which those unknowns are closed. It is also the cheapest point at which to change a decision: a revised crane position costs a drawing revision during preconstruction and a great deal more once foundations are cast.

Questions the site will ask anyway

Every site eventually answers the same questions: where materials are delivered, how they are lifted, where people park and eat, and how the public is kept safe. Answering them during preconstruction allows the design to respond. Answering them during construction forces the programme to absorb them.

• Access and delivery routes, including timing restrictions
• Crane positions, oversail and foundation design
• Temporary works affecting permanent design
• Neighbouring structures, monitoring and agreements
• Utility diversions and connection lead times

Ordering decisions

The design team needs to know which decisions must be made, and by when. A decision schedule linked to the procurement programme turns open questions into dated actions. Without it, decisions drift until they become urgent.

A programme built on frozen information can be managed. A programme built on assumptions can only be hoped for.

What a client should expect to receive

At the end of preconstruction, a client should hold a programme with a defined critical path, a logistics plan, a cost plan with visible assumptions, a risk register with named owners and a procurement schedule. Each document should be specific to the site, not adapted from the last project.