Scheduling

What are long-lead items in construction?

Long-lead items are materials or equipment whose lead time is long enough that they must be ordered early, sometimes before design is finished, to avoid delaying the project.

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.

A long-lead item is anything you cannot buy off the shelf in time. Switchgear, transformers, elevators, rooftop units, generators, curtain wall, custom windows, structural steel, and specialty doors and hardware often make the list. The exact list changes with the market, the region, and the job. What makes an item long-lead is simple: its lead time is longer than the gap between when you can order it and when the schedule needs it.

Long-lead items are where schedules quietly die. A $90,000 electrical gear package delayed six weeks can idle a $5 million building, because nothing gets energized, tested, or inspected without it.

How contractors handle long-lead items

  1. Identify early: during preconstruction, the team lists every item with a lead time beyond a set threshold and gets current quotes.
  2. Schedule them: each item gets its own chain in the schedule: submittal, review, approval, fabrication, delivery, install.
  3. Release early: the owner may approve an early purchase before the full contract is signed, through a letter of intent or a separate early procurement agreement.
  4. Track weekly: someone owns expediting, checks fabrication status, and gets ship dates in writing.
  5. Plan storage: decide where the item goes if it arrives early, and whether it can be billed as stored materials.

A worked example

A GC wins a $3.8 million charter school with a 10-month schedule. In week one, the precon team builds a long-lead log.

Example: long-lead log at contract award
ItemQuoted lead timeNeeded on siteOrder by
Main switchboardAssumed 30 weeksMonth 7Week 2 (late already)
Rooftop HVAC unitsAssumed 14 weeksMonth 6Month 2
Storefront and curtain wallAssumed 12 weeksMonth 5Month 2
Door hardwareAssumed 10 weeksMonth 8Month 4

The lead times here are made up to show the method; real quotes vary. The switchboard is the problem. The GC tells the owner right away, gets approval for early release of electrical submittals, and asks the electrical sub to check for a comparable stock unit. The early warning is what makes those options possible.

Common mistakes

  • Waiting for the full submittal package before sending long-lead items. Split them out and send them first.
  • Letting the architect review long-lead submittals in the normal queue. Ask for priority review.
  • Not telling the owner. If ordering early needs money or a design decision, the owner has to know now.
  • Trusting a lead time quoted at bid time, months before the order.
  • Assuming the sub is handling it. The GC carries the schedule risk, so the GC should track it too.

Related terms

Owners also play a part. If they want a specific make of generator or a custom light fixture, the decision has to come early enough to order it. A long-lead log shared with the owner makes clear which design decisions are holding up which orders.

See procurement, submittal schedule, substitution request, and the guide how to manage long-lead items. Smart Business Automator tracks submittals and shipments for every long-lead item and raises risk alerts when a ship date slips; see RFI and submittal tracking automation.

Frequently asked questions

What counts as a long-lead item?

Any material or equipment whose lead time threatens the schedule if ordered at the normal time. Electrical gear, HVAC equipment, elevators, curtain wall, and custom fabrications are common examples.

Who is responsible for ordering long-lead items?

Usually the subcontractor or supplier for that scope, but the GC or construction manager tracks them because it carries the overall schedule risk.

Can the owner buy long-lead items directly?

Yes. Some owners pre-purchase equipment and assign it to the contractor later. The contract should spell out who handles delivery, storage, and warranty.

Can I bill for long-lead items before they are installed?

Often, if the contract allows billing for stored materials and you provide proof of ownership, insurance, and storage.

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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