Three-Week Look-Ahead: Turn Your Gantt Into Site Action

Why doesn't the master Gantt tell a foreman what to do tomorrow?

A master Gantt is built to show the whole project at a glance — months of tasks, milestones, and dependencies compressed into a single view. That visibility is what a project manager needs to track overall progress and explain the plan to an owner. But it is not what a foreman needs at seven in the morning when deciding which crew goes where. A Gantt that spans eighteen weeks often carries tasks so long and general that a foreman cannot tell whether the tiling crew should start on the kitchen or the bathroom, or whether the block-work team needs to wait for anything before moving to the upper floor. The master Gantt is the destination; the three-week look-ahead is the turn-by-turn navigation that gets the crew there each day.

What is a three-week look-ahead schedule?

A three-week look-ahead is a short-interval plan extracted from the master Gantt that covers only what needs to happen in the next fifteen to twenty working days. It lists every task scheduled to start or continue in that window, what labour and materials each task requires, what must be confirmed or delivered before the task can begin, and which trade hands off to which after completion. Unlike the master Gantt — maintained by the project manager — the look-ahead is foreman-facing: it gives each foreman a clear picture of what their crew is doing this week and what is coming the week after. Because the window is short, any obstacle that would stop a task from starting can be spotted and resolved four to fourteen days before the task is due, rather than on the morning the crew arrives and finds materials have not been delivered.

How do you build a three-week look-ahead from the Gantt planning view?

Open the Gantt planning view and focus on the next twenty working days. Identify every task scheduled to start, or that is already in progress, within that window. For each task, note four things: the planned start and finish date, the trade or subcontractor responsible, any predecessor task that must finish first, and any material or inspection that must be arranged beforehand. Compile these into a simple table shared with each foreman before Monday's site meeting. All this information already lives in the Gantt planning view — the look-ahead is simply a foreman-readable summary of it, refreshed each week. When foremen log daily updates through the on-site progress updates feature, the Gantt adjusts automatically, so the following week's look-ahead always pulls from a current plan rather than a stale one.

A worked example: recovering two weeks on an 18-week Bangkok shophouse project

Khun Thanaporn was managing a 3.2 million baht shophouse renovation in Bang Na on an 18-week programme. In week six she noticed the electrical rough-in had reached only 40 percent — the subcontractor had lost four workers to another job without informing her. She opened the Gantt planning view and pulled the look-ahead for weeks seven through nine. Three tasks — framing inspection, ceiling board installation, and wet-area waterproofing — all depended on the electrical rough-in finishing first. Without the look-ahead, the framing crew would have arrived in week eight to find nothing ready. Because she had three weeks' warning, she called the electrical subcontractor on Thursday, arranged a replacement crew for the following Monday, and used the freed days to accelerate block work on the ground floor where materials were already on site. The programme recovered one full week before the inspection was ever needed.

Who owns the look-ahead, and how often should it be updated?

The project manager or site engineer prepares the look-ahead once per week — typically Friday afternoon or Saturday morning before the new work week begins. Foremen review it at Monday's site meeting and flag any constraint they already know about: a supplier who cannot deliver on time, a permit that has not arrived, a crew that is short-staffed. The document belongs to the project manager, but its accuracy depends on the foremen, who know about ground-level constraints that never appear in any Gantt. Any constraint that could affect a task in the current week should be escalated and resolved the same day. A look-ahead that is prepared but never discussed in a meeting delivers only half its value — the conversation is where the real benefit is extracted from the plan.

How do on-site progress updates feed into the following week's look-ahead?

Each day, the foreman logs percentage complete for active tasks through the on-site progress updates feature — a thirty-second entry from the phone. By Friday, the project manager has a precise read on how far each task actually advanced during the week, not an estimate from a Saturday phone call. This actual progress is reflected automatically in the Gantt planning view and becomes the input to the next week's look-ahead. If tiling reached 60 percent instead of the planned 80 percent, the look-ahead will correctly show that two more days of tiling remain before the painter can enter — preventing a crew conflict that would otherwise only surface when the painter shows up on Monday morning and finds the tiler still on the floor.

FAQ: What should you do when a subcontractor cannot start their look-ahead task on time?

Respond in three steps. First, check in the Gantt planning view how much float the delayed task carries. If there is enough free float to absorb the delay without affecting the project completion date, note the change in the Gantt and continue without alarm. If there is no float and the task is on or near the critical path, then second, identify tasks in the same window that do not depend on the delayed subcontractor and can be pulled forward — bring an unblocked task into the gap to keep crews productive. Third, contact the subcontractor in writing to document the conversation and record the revised start date in the Gantt planning view. A subcontractor who gives three weeks' warning of a problem is a good partner; the look-ahead is precisely the mechanism that creates that three-week window in the first place.

FAQ: How does sharing the look-ahead through the owner sharing link change client conversations?

An owner who sees only an overall percentage — say, 54 percent — cannot tell whether the project is well managed or quietly drifting. When the owner sharing link in SiteBoard shows the Gantt with upcoming tasks marked in progress or complete, the owner can see that the tiling crew is mid-task, the painter is lined up behind them, and the electrical final inspection is booked for week fourteen. That specificity turns a number into a narrative the owner can follow and trust. It also shifts the questions they ask: instead of asking whether the project is on track, they ask whether the tile delivery will arrive before Monday — precisely the kind of question a prepared contractor can answer with confidence and specific detail.

FAQ: How many tasks should a realistic three-week look-ahead include?

A look-ahead for a medium-sized residential project typically covers twelve to twenty-five active tasks, depending on how many trades are working at once. Fewer than ten usually means the look-ahead window is not granular enough — tasks are too broad and hide scheduling conflicts within them. More than thirty tasks makes the document unwieldy for a foreman to scan in a five-minute morning meeting. If your master Gantt contains tasks that run four or more weeks, break them into weekly sub-tasks before extracting the look-ahead. The Gantt planning view makes this straightforward: a four-week task split into four linked one-week tasks will then show the correct weekly slice in the look-ahead, giving foremen clear, actionable work units without losing the overall programme view.