Scheduling

How to make a three-week look-ahead schedule

A three-week look-ahead pulls the next 15 working days out of the master schedule, breaks them into crew-level tasks by area, and lists what has to be true (materials, inspections, answers) for each task to start.

Two construction professionals review paper plans beside a tablet at a jobsite workbench.
Plan reviews connect field conditions, drawings, and the next decisions on a job. AI-generated illustration.

To make a three-week look-ahead schedule, take the activities from the master schedule that fall in the next three weeks, break each into tasks a single crew can finish in a day or a few days, assign each task to a company and an area, and list the constraints that must be cleared first. Update it every week in the subcontractor meeting: drop the week that just ended, add a new third week, and mark what got done. The look-ahead is where the master schedule turns into work crews can plan around.

The master schedule tells the owner when the job finishes. The three-week look-ahead tells the drywall foreman how many hangers to send Tuesday and which floor to start on.

Why three weeks?

Three weeks is long enough to see problems coming and short enough to plan in detail. It roughly matches how far ahead most subs commit crews, how long many routine material orders take, and how far ahead you can book inspections. Some jobs use two weeks, some use six. The method is the same; pick a window that covers the lead time of the things that usually stop your work.

How to make a three-week look-ahead in 7 steps

  1. Pull the window from the master schedule. Filter the current schedule to activities that are in progress or start in the next 15 working days. If the master is out of date, update it first.
  2. Break activities into tasks. A master activity like level 2 MEP rough-in, 15 days becomes plumbing rough-in east wing, electrical rough-in east wing, duct mains west corridor, and so on. Each task gets one responsible company.
  3. Assign areas and days. Lay tasks on a day-by-day grid by area or room. This shows trade stacking, where two crews are planned in the same room on the same day.
  4. List constraints for every task. Ask what has to happen first: approved submittal, material on site, RFI answer, inspection passed, area turned over by the previous trade, equipment available.
  5. Assign who clears each constraint and by when. A constraint with no owner and date is just a worry. Put the PM on the RFI and the super on the inspection call.
  6. Review it with the subs. Walk the look-ahead in the weekly meeting. Foremen confirm manpower and flag conflicts. Commitments should come from the people doing the work.
  7. Track completion. At the end of each week, mark each planned task done or not done, and record the reason when not. The Lean Construction Institute calls this measure Percent Plan Complete: how many of the week's planned tasks were completed on time.

Worked example: one week of a look-ahead

Say a general contractor is building a two-story, 24,000 SF office building. Week 1 of the look-ahead covers the second floor, which is being framed and roughed in.

Example: week 1 tasks with constraints
TaskCompanyDaysConstraintOwner, due
Frame interior walls, L2 eastFraming subMon to WedRevised door schedule from RFI 31PM, Friday prior
Plumbing rough-in, L2 restroomsPlumberTue to ThuWalls framed at restroom coreFramer, Monday
Electrical rough-in, L2 eastElectricianWed to FriFraming complete eastFramer, Wednesday
Duct mains, L2 corridorMechanical subMon to ThuDuct delivery confirmedMech PM, Friday prior
Fire sprinkler mains, L2Sprinkler subThu to FriShop drawing approvalArchitect via PM, Wednesday
Book above-ceiling inspection, L1GC superMonL1 rough-in completeSuper, Monday

Weeks 2 and 3 carry the same columns but less day-by-day detail. At the end of week 1, the super marks 22 planned tasks across the job. Eighteen finished as planned, so the week's percent plan complete is 18 divided by 22, about 82 percent. Of the four misses, two were the sprinkler mains waiting on the shop drawing, one was the framer short two carpenters, and one was a failed inspection. The shop drawing problem was visible on the look-ahead a week early. Next time, the PM escalates sooner.

What to include on every look-ahead

  • Task description, area, and responsible company.
  • Planned days on a calendar grid.
  • Manpower each sub commits per day.
  • Constraints, with owner and due date.
  • Deliveries and long lead items arriving in the window.
  • Inspections to request, with the lead time your building department needs.
  • Master schedule activity ID, so progress rolls back up.

How to roll the look-ahead forward each week

The look-ahead only works if it moves every week on the same day. A simple rhythm that fits most jobs:

  • Thursday or Friday: the super marks last week's tasks done or not done and writes the reason for each miss. The PM updates constraint status: which RFIs are answered, which submittals are back, which deliveries are confirmed.
  • Before the sub meeting: the super drafts the new third week from the master schedule and moves week 2 and 3 tasks forward a week, adding day-level detail to the new week 1.
  • Sub meeting: each foreman confirms or pushes back on their tasks and manpower. Conflicts get settled in the room, not by text on Monday morning.
  • After the meeting: the final look-ahead goes out to every sub and is posted in the trailer. Progress on finished tasks goes back into the master schedule update.

On a small residential job, the same rhythm can be a 15-minute call and a shared sheet. The point is the habit of looking three weeks out, not the format.

Mistakes to avoid

  1. Printing the master schedule bars for three weeks and calling it a look-ahead. Without task detail and constraints, it adds nothing.
  2. Writing it in the trailer without the foremen. Commitments made for a sub are not commitments.
  3. Listing constraints without owners and dates.
  4. Never checking what was finished, so the plan never gets more reliable.
  5. Letting the look-ahead drift from the master. Progress on tasks has to feed the weekly schedule update.
  6. Planning work in areas the previous trade has not turned over.

Templates, terms, and tools

The three-week look-ahead template has the task, area, day grid, and constraint columns ready to fill. Use it alongside the construction meeting minutes template for the weekly sub meeting. Related terms: look-ahead schedule, lean construction, and submittal schedule. For running the meeting itself, see how to run an effective weekly construction meeting.

Smart Business Automator keeps RFIs, submittals, and shipment tracking on the job record, which makes the constraint column easier to fill: you can see which answers and deliveries are still open before the meeting. See construction workflow automation.

Frequently asked questions

Who prepares the three-week look-ahead?

Usually the superintendent, with input from each subcontractor foreman. The project manager owns the constraints that involve the owner, the design team, and procurement.

How is a look-ahead different from the master schedule?

The master schedule covers the whole job at the activity level and sets the contract finish. The look-ahead covers the next few weeks at the task level, by crew and area, with the constraints that must be cleared to do the work.

What is percent plan complete?

It is the share of tasks planned for the week that were completed as planned. For example, 18 of 22 tasks done is about 82 percent. It measures how reliable the weekly plan is, not how far along the job is.

Should subcontractors make their own look-aheads?

Many do, especially larger trades. Their look-ahead should match the GC's for shared areas and dates, and conflicts should come out in the weekly meeting.

Sources

  1. Lean Construction Institute: Last Planner System
Written and edited by

Maurice Francois writes and edits construction operations guides for Smart Business Automator. More from Maurice on the Scaling Legends podcast.

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