A 2-week lookahead (also called a short-interval schedule or rolling lookahead) is a detailed, day-by-day work plan that covers the next 10 working days. It takes the high-level master schedule and translates it into specific assignments that field crews can execute.
The master schedule says "Module installation: Week 12." The 2-week lookahead says "Monday: Crew A installs modules on Roof Section 2, starting at row 14. Forklift scheduled for 7 AM material staging."
That level of detail is what separates projects that run smoothly from those that stall every time a crew asks "what are we doing today?"
Why the Master Schedule Isn't Enough
The master schedule is essential for long-range planning, but it's too high-level for daily field coordination. It doesn't answer:
- Which specific areas are crews working in each day?
- What materials need to be staged and where?
- Which inspections are scheduled this week?
- What needs to happen today so tomorrow's work can proceed?
improvement in plan reliability when teams use lookahead scheduling
Source: Lean Construction Institute
The 2-week lookahead fills this gap. It's the bridge between strategy (master schedule) and execution (daily work).
How to Build a 2-Week Lookahead
Pull activities from the master schedule
Start with every activity that's scheduled to occur in the next 2 weeks. Include activities that are in progress, starting soon, or that have prerequisites due this period.
Break activities into daily tasks
A master schedule activity like "Electrical Rough-In (5 days)" becomes five daily tasks: Day 1 — Pull home run conduit. Day 2 — Wire DC circuits, Roof Section 1. Day 3 — Wire DC circuits, Roof Section 2. Etc.
Check constraints for every task
Before assigning a task to a specific day, verify that all prerequisites are met: prior work complete, materials on site, equipment available, inspections passed, weather acceptable.
Assign crews and resources
Name the crew or individual responsible for each daily task. Include equipment needs (crane, forklift, scissor lift) and material staging requirements.
Review with the team
Walk through the lookahead with your superintendent, foremen, and key subcontractors. They'll catch conflicts and constraints you missed. This review typically happens every Monday or Friday.
Distribute and post
Make the lookahead visible to everyone on site. Post it in the job trailer. Share it digitally. The field team can't follow a plan they haven't seen.
What a 2-Week Lookahead Looks Like
Here's an example for the construction phase of a C&I rooftop solar project:
WEEK 1 — Feb 24–28
──────────────────────────────────────────────────────────────────
Mon 2/24 Crew A: Complete racking, Roof Section 3 (WBS 1.4.2)
Crew B: Begin module install, Roof Section 1 (WBS 1.4.3)
Material: 120 modules staged on Roof Section 1
Tue 2/25 Crew A: Module install, Roof Section 2 (WBS 1.4.3)
Crew B: Continue modules, Roof Section 1
Equipment: Forklift on site 7 AM for staging
Wed 2/26 Crew A: Continue modules, Roof Section 2
Crew B: Complete modules, Roof Section 1
INSPECTION: Racking inspection, Roof Section 3 @ 10 AM
Thu 2/27 Crew A: Complete modules, Roof Section 2
Crew B: Begin DC wiring, Roof Section 1 (WBS 1.4.4)
Material: Verify wire and conduit on site for electrical
Fri 2/28 Crew A: Begin modules, Roof Section 3
Crew B: Continue DC wiring, Roof Section 1
NOTE: Weather check — rain forecast, have tarps ready
WEEK 2 — Mar 3–7
──────────────────────────────────────────────────────────────────
Mon 3/3 Crew A: Complete modules, Roof Section 3
Crew B: Complete DC wiring, Roof Section 1
MILESTONE: All modules installed (WBS 1.4.3 complete)
Tue 3/4 Crew A + B: DC wiring, Roof Sections 2 & 3 (WBS 1.4.4)
Material: Additional conduit delivery expected AM
Wed 3/5 Continue DC wiring, all sections
INSPECTION: Module installation inspection @ 2 PM
Thu 3/6 Begin inverter installation (WBS 1.4.5)
Continue DC wiring completion
Fri 3/7 Complete inverter mounting and AC connections
PREP: Stage commissioning test equipment
Include WBS codes on every task
Tying each lookahead task to a WBS code connects daily field work to the project budget and schedule. When crews log time against the same WBS codes, you get automatic cost tracking at the activity level.
The Constraint Check: The Most Important Step
Before a task makes it onto the lookahead, it must pass the constraint check. For every task, ask:
- Predecessor complete? — Is the prior work finished so this task can start?
- Materials on site? — Are all required materials delivered and staged?
- Equipment available? — Is the crane, forklift, or lift scheduled and confirmed?
- Labor assigned? — Is the crew available, or are they committed elsewhere?
- Inspections cleared? — Have required inspections passed?
- Weather acceptable? — Is the forecast compatible with the planned work?
Tasks that fail the constraint check don't go on the lookahead
If a task can't pass the constraint check, it's not ready. Putting a constrained task on the lookahead sets the crew up for failure and wastes a day of productivity.
Measuring Lookahead Reliability: PPC
Plan Percent Complete (PPC) measures how many of your planned lookahead tasks actually got completed as scheduled. It's the single best metric for field execution reliability.
Formula: PPC = (Tasks completed as planned ÷ Total tasks planned) × 100
- PPC above 80% — Your planning is reliable. Constraints are being identified and removed effectively.
- PPC 60–80% — Room for improvement. Analyze why tasks are falling off the plan.
- PPC below 60% — Serious planning or execution problems. Your lookahead is more fiction than plan.
Track PPC weekly. When a task doesn't get completed as planned, document the reason. Common reasons reveal systemic problems: if material delays show up every week, you have a procurement issue, not a scheduling issue.
Common Lookahead Mistakes
Building it once and not updating
The lookahead should roll forward every week. At the end of Week 1, add a new Week 3 and update Week 2 based on actual progress. Stale lookaheads lose credibility fast.
Not enough detail
"Install electrical" as a daily task isn't useful. "Pull home run conduit from combiner box to inverter pad, 120 ft, Crew B" is useful. The field crew should be able to read the lookahead and know exactly what to do.
Skipping the constraint check
Putting tasks on the lookahead without verifying they're ready to execute is the fastest way to kill your PPC. If materials aren't on site, the task isn't ready.
Key Takeaways
- The 2-week lookahead bridges the gap between the master schedule and daily field work
- Break master schedule activities into specific daily tasks with crew assignments
- Every task must pass a constraint check before it goes on the lookahead: predecessor, materials, equipment, labor, inspections, weather
- Measure Plan Percent Complete (PPC) weekly — aim for 80%+
- Update the lookahead every week by rolling forward and adjusting for actual progress
Frequently Asked Questions
What is a 2-week lookahead in construction?
A 2-week lookahead is a detailed, day-by-day work plan covering the next 10 working days. It translates the high-level master schedule into specific daily assignments for field crews, including crew assignments, material needs, equipment requirements, and scheduled inspections.
How often should the lookahead be updated?
Weekly. At the end of each week, review what was completed, roll the schedule forward by adding a new week, and adjust the current week based on actual progress and any new constraints.
What is PPC (Plan Percent Complete)?
PPC measures the percentage of planned lookahead tasks that were actually completed as scheduled. It's calculated as: (Tasks completed as planned ÷ Total tasks planned) × 100. A PPC above 80% indicates reliable planning. Below 60% signals systemic planning or execution problems.
Who is responsible for building the 2-week lookahead?
Typically the project superintendent or project manager, in collaboration with field foremen and key subcontractors. The people doing the work should have input into the plan — they know what's realistic and what constraints exist.