What is three-week look-ahead in construction?
A three-week look-ahead is a short-term schedule, usually updated weekly, that breaks the next three weeks of the master schedule into daily or weekly tasks by trade and area so crews, material, and inspections line up. The superintendent usually prepares it with input from foremen. Each week the finished week drops off and a new third week is added.
A three-week look-ahead takes the next 15 working days of the project schedule and makes them specific enough to run the job. Where the master schedule says "Level 3 framing, 10 days," the look-ahead says which crew starts on which grid line Monday, when the inspection is called, and which delivery has to land Wednesday for that to happen. It is the most-used schedule on most job sites.
The superintendent usually owns it, with input from foremen at a weekly meeting. Each week, the first week drops off, weeks two and three get refined, and a new week three is added from the master schedule. That rolling update is the point: it is close enough to be accurate and far enough out to fix problems before they hit the field.
How a three-week look-ahead works on a real job
Say a GC is running a $2.2 million retail shell. At the Tuesday subcontractor meeting, the super walks the look-ahead line by line. Each task has a responsible trade, an area, start and finish days, and a constraint column: anything that must be true before the task can start.
| Task | Trade | Week 1 | Week 2 | Week 3 | Constraint |
|---|---|---|---|---|---|
| Underground plumbing, east half | Plumber | Mon to Thu | Layout approved | ||
| Plumbing inspection | Plumber / city | Fri | Inspection called by Wed | ||
| Slab on grade, east half | Concrete | Tue to Wed | Rebar delivered Mon | ||
| Steel erection | Steel sub | Mon to Fri | Shop drawings returned, steel shipped |
The constraint column does the work. The steel line shows the shop drawings are still with the engineer. Without the look-ahead, nobody notices until the erector calls asking where the steel is. With it, the PM has three weeks to chase the approval and confirm the ship date.
What goes into a good look-ahead
- Tasks small enough to check: two to five days each, by area, so you can say done or not done.
- One responsible party per line, named by company and ideally by foreman.
- Constraints: RFIs, submittals, deliveries, inspections, equipment, and predecessor work.
- Deliveries and inspections as their own lines, because they are where the schedule usually breaks.
- A link to the master schedule, so slips here show up in the critical path update.
Three-week look-ahead and lean planning
Look-aheads are a core piece of lean construction planning methods, where the team screens upcoming tasks for constraints and only commits to work that is ready. Some teams look further out on complex jobs. Three weeks is the common default because it matches the time needed to resolve most constraints: get an RFI answered, release an order, schedule a crane. The general idea is covered in more depth under look-ahead schedule.
Common mistakes
- Copying the master schedule. A look-ahead with the same 10-day bars as the CPM schedule adds nothing. Break it down.
- Building it alone in the trailer. Foremen know what their crews can actually do. If they did not commit to it, they will not own it.
- No constraint check. Listing tasks without asking what could stop them is just a calendar.
- Never measuring. Track how many committed tasks finished as planned each week and why the others missed. Patterns tell you which sub or which process keeps slipping.
- Letting it go stale. A look-ahead that is two weeks old is worse than none, because people trust it.
Related terms
See baseline schedule, recovery schedule, long-lead items, and Gantt chart. Smart Business Automator keeps tasks, open RFIs, submittals, and shipments on the same job record, so constraints for the next three weeks are easy to pull together.
Frequently asked questions
Who prepares the three-week look-ahead?
Usually the superintendent, with input from subcontractor foremen at a weekly coordination meeting. The PM reviews it against procurement and submittal status.
How often is a three-week look-ahead updated?
Weekly. Each update drops the week just finished, refines the next two weeks, and adds a new third week from the master schedule.
Is a look-ahead a contract document?
Usually not. It is a working tool for the field. The contract schedule is the baseline and its approved updates, though some contracts require look-aheads to be submitted with monthly updates.
What is the difference between a look-ahead and a master schedule?
The master schedule covers the whole project at a summary level. The look-ahead covers the next few weeks in detail, by task, area, and trade.
