Long lead items and the construction schedule date behind the date

Long lead items on a construction schedule carry two dates. The one everybody looks at is the installation date. The one that decides whether the job finishes on time is the release date, months earlier, and it is rarely on the bar chart.

The two dates every long lead item has

A switchgear lineup shows on the schedule as an activity in month sixteen. That is the installation date, and it is the date everybody discusses.

Behind it sits a chain: submittal prepared, submittal reviewed, submittal approved, order released, manufactured, shipped, delivered. On a piece of electrical equipment that chain is routinely nine to fourteen months, and on some categories it has been considerably longer since the supply disruptions of the early 2020s.

Work back from month sixteen and the order has to be released in month three or four. The approval has to be complete a few weeks before that. The submittal has to be produced a few weeks before that. The design decision behind it has to be made earlier still.

That earliest date is the real one. Once it passes, no amount of management recovers the time, because the constraint is a factory rather than a crew.

The schedule does not usually show it. Procurement activities appear as a summary bar if they appear at all, and the release dates live in a separate log kept by somebody in the contractor purchasing department.

Why long lead items on a construction schedule behave differently

Most schedule risk is elastic. A crew that is behind can be doubled. A sequence can be resequenced. Two trades can work in the same area at some cost in efficiency.

Procurement is not elastic in the same way. A manufacturer with a fourteen month backlog does not have a night shift you can buy. Expediting exists and it is real, but it typically buys weeks rather than months and it is priced accordingly.

The second difference is that the consequence lands late. A crew running behind in month five is visible in month five. A missed release date in month four produces nothing at all until month sixteen, when the equipment does not arrive. Twelve months of clean reporting precede the problem.

The third is that these items are usually on the critical path by definition. Switchgear, generators, chillers, elevators, curtain wall and custom air handling units are not decorative. Nothing downstream of them can complete without them, which is why a slip here moves the completion date directly rather than consuming float.

What sits between the decision and the order

The gap between an owner making a decision and a factory receiving an order is longer than most owners expect, and almost all of it is process.

The subcontractor prepares a submittal, which takes time it has not usually promised in writing. The design team reviews it, which takes whatever the contract allows, commonly fourteen days and frequently longer. A rejected submittal restarts the clock.

Then the purchase order is released, which sometimes waits on a subcontract being executed, which sometimes waits on a bond, which sometimes waits on insurance certificates.

Add it up and eight to twelve weeks between decision and release is normal on a well run job. On one where the design decision arrives late, or where a submittal is rejected once, it is longer.

This is why an owner decision with a three month deadline is not a three month decision. It is a one month decision with two months of process behind it, and the float on it is smaller than the schedule suggests. How that float disappears is covered in who owns float on a construction schedule.

A worked example

A $61 million project with substantial completion in month twenty two. The electrical service equipment shows an installation activity in month fifteen.

Manufacturer lead time is eleven months. Submittal, review and release add ten weeks. The release date is therefore month one and a half, which is two weeks before the guaranteed maximum price was signed.

Nobody notices, because the schedule shows installation in month fifteen with twelve weeks of float on the activity, and the float is calculated against the installation rather than against the release.

The order goes out in month four. The equipment is now scheduled to arrive in month seventeen against an installation activity in month fifteen. The eleven week gap is real and it lands on the critical path, because energization gates commissioning and commissioning gates completion.

The recovery options are expediting at a quoted premium, a temporary service, or a two month extension. All three are expensive and all three exist because a date two weeks before signature was not on any document anybody read.

What to require before you sign

1. A procurement log listing every item with a lead time over twelve weeks, by name.
2. The release date for each, calculated back from the installation activity including submittal and review time.
3. Every release date already in the past marked separately, because those are findings rather than risks.
4. The owner decision behind each item named, with the decision date it requires.
5. The submittal review period in the contract checked against the number of long lead submittals.
6. The release dates shown on the schedule as activities, not kept in a separate purchasing log.
7. Monthly reporting of released against unreleased items, as a count and a value.

Item three catches the most on a typical job. It is common for a guaranteed maximum price to be signed with two or three release dates already passed, and none of it appears anywhere as a delay because no activity has started late yet. The full list of pre signature questions is in the questions to ask before you sign.

Why this is a cost question as well as a schedule one

A missed release date produces cost in four ways, and only one of them is obvious.

Expediting premiums are the visible one. A manufacturer will often move a slot for a price, and the price is set by somebody who knows exactly how much you need it.

Extended general conditions are the larger one. Every month of extension carries the contractor site staff, trailers, equipment and insurance, which on a mid size project is a substantial monthly figure regardless of how much work is being performed.

Acceleration of everything downstream is the third. If the equipment cannot move, the only remaining variable is the work after it, which means overtime and additional crews at premium rates.

The fourth is the least discussed. A late equipment decision is a decision made under pressure, which means the option that is available beats the option that was wanted, and the specification quietly degrades without anybody recording it as a change.

Put together, a single missed release date on a mid size project routinely costs more than the whole review that would have found it, and it costs it in categories that never appear as one line. The expediting premium shows up as a change order, the extension shows up as general conditions, the acceleration shows up in a different trade entirely, and the substitution shows up as nothing at all.

That distribution is why the item is easy to miss in hindsight as well as in advance. Nobody ever writes down that the project lost a million dollars to a purchase order released eleven weeks late.

What we do

We build the release date for every long lead item back from its installation activity, including submittal and review time, and identify the ones already past. Each is paired with the owner decision behind it and the exposure if it slips further. It is a reading of the documents rather than a planning exercise, and we do not rebuild the schedule. The work sits in the schedule and procurement risk review.

Questions people ask