For a lot of small and mid-size general contractors, the first sign that a job is different is a single paragraph in the specifications: submit a Critical Path Method schedule in Primavera P6 within a set number of days after notice to proceed, and no progress payment will be processed until it is accepted.
That paragraph usually sits in Section 01 32 16, Construction Progress Schedule, or in an owner-written scheduling specification that does the same job. It turns the schedule from a planning tool into a payment gate. Until the baseline is accepted, the first pay application waits.
The good news is that owners' reviewers are predictable. They check the same things on almost every submittal. A GC who knows the list can get a baseline accepted on the first or second submission instead of the fourth.
1. Does it follow the specification, line by line?
Reviewers start with the specification, not the schedule. Before opening the file, they list what the spec requires and then look for each item. The common ones:
- Submission deadline and format. Native P6 file (XER), PDF Gantt chart, and a written narrative, usually within 15 to 30 days of notice to proceed.
- Activity duration limits. Many specs cap construction activities at 15 or 20 working days, excluding procurement and long-lead fabrication.
- Activity coding. Area, phase, responsible party, CSI division or bid item, as the owner defines them.
- Calendars. Work week, holidays, and in many contracts a weather calendar or a stated number of anticipated weather days per month.
- Cost loading. Some public owners require the schedule of values to be loaded onto activities so the schedule drives the pay application.
- Owner activities. Submittal reviews, owner-furnished equipment deliveries, inspections and owner move-in, shown with the durations the contract allows.
A baseline that is technically sound but misses two of these items will be rejected for those two items. The fastest path to acceptance is a compliance matrix: each spec requirement, and where in the submittal it is met.
2. Is the logic complete?
After compliance, reviewers check whether the schedule calculates on its own. In practice that means:
- No open ends. Every activity except the first and last has at least one predecessor and one successor.
- Few constraints. Dates typed into activities instead of driven by logic are the first thing a reviewer questions, because they hide the real critical path.
- Mostly finish-to-start relationships. Heavy use of start-to-start with lags is a sign the work was not broken down far enough.
- No negative lags. Leads are hard to defend and most reviewers ask for them to be removed.
Reviewers often run the DCMA 14-point assessment as a quick screen. Passing it does not make a schedule good, but failing it badly is an easy reason to reject.
3. Does the critical path make sense?
This is where an experienced reviewer earns their fee. They look at the critical path and ask whether it is the path the job will actually follow. A critical path that runs through drywall in one room, then jumps to landscaping, then to final cleaning, usually means the logic is incomplete and the real driving work is hidden.
On the small and mid-size jobs most GCs build, the real critical path usually runs through a handful of things: permits and early submittals, long-lead equipment (switchgear, generators, air handlers, elevators), structure or building dry-in, the main mechanical and electrical rough-in, inspections, and final commissioning and occupancy. If those do not appear on or near the critical path, the reviewer will ask why.
4. Are the durations believable?
Reviewers compare durations to the size of the work. Two weeks to frame three floors, or a single activity for all electrical rough-in, will draw a comment. Durations do not need to be proven, but they should be defensible: tied to quantities, crew sizes or the subcontractor's own commitments.
5. Does the narrative explain the plan?
The narrative is where the GC explains the sequence in plain language: how the job is broken into areas, what drives the critical path, what assumptions were made about weather, permits and owner reviews, and what the major risks are. A clear narrative answers half the reviewer's questions before they are asked.
Why getting it right the first time matters
A rejected baseline costs more than a resubmittal. The first pay application waits. The owner's team starts the job doubting the contractor's controls. And the accepted baseline becomes the yardstick for every later time extension request, so the assumptions in it matter for the life of the contract.
Where CPM Pros fits
CPM Pros builds contract-required Primavera P6 baselines for general contractors who do not keep a scheduler on staff. We read the specification before we quote, build to it, answer the reviewer's comments line by line, and resubmit until the baseline is accepted. Then we run the monthly updates and narratives through closeout. The work is fully remote and has covered GCs in Michigan, Georgia, Arizona, Pennsylvania and Washington.
If your contract requires a P6 baseline, send the scheduling specification and the drawings and we will send back a written quote, typically within 3 business days.