Field

What is demobilization in construction?

Demobilization is the end-of-job work of moving equipment, people, trailers, and temporary facilities off the site and leaving it the way the contract requires.

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Demobilization (demob) is the reverse of mobilization. When a contractor's scope is done, someone has to load out the equipment, return the rentals, pull the office trailer, disconnect temporary power and water, remove fence and erosion controls the contract says are yours, haul the last dumpster, and clean up. All of that costs money, and most of it happens after the last production dollar has been billed.

That timing is the whole problem with demob. If it is buried in other line items, the cost shows up on the job cost report when there is nothing left to bill against it.

What demobilization usually includes

  • Loading and trucking equipment back to the yard or the rental house, including lowboy and permit costs for heavy iron.
  • Removing office and storage trailers, sanitation, and temporary utilities, plus the utility company's disconnect fees.
  • Removing temporary fencing, barricades, signage, and site protection.
  • Final cleanup and haul-off of debris and leftover material.
  • Restoring laydown areas, haul roads, or staging yards to the condition the contract describes.
  • Crew travel home from a remote site.

Partial demobilization also happens. A sitework sub may demob after mass grading and remobilize months later for final paving. If the contract prices only one mobilization, every extra trip is unpaid unless it was caused by the owner and documented as a change.

How demobilization is priced and paid

On private work, demob is often combined with mobilization into one lump sum item on the schedule of values, with a portion held for the end. On some public work it is a separate pay item. On Department of Defense construction that uses DFARS clause 252.236-7004, the government pays mobilization and demobilization of plant and equipment at the lump sum bid, part on completion of mobilization and the rest on completion of demobilization. If the contracting officer thinks the split does not match the real cost, the clause allows a request for cost data, and an unjustified price can be replaced by actual costs with the remainder paid at final payment.

A worked example

Say a concrete sub carries $36,000 for mobilization and demobilization on a $700,000 parking structure package. It splits the line on the schedule of values: $24,000 for mobilization, billed in month one, and $12,000 for demobilization, billed when the forms and the pump are off site. Without that split, the sub would have billed the full $36,000 early, and the GC might reasonably push back on the front-loading. With it, the last billing has real money attached to real work, and the sub still has a reason to finish cleanly.

Common mistakes

  1. Not pricing demob at all, on the theory that it is just the end of the job.
  2. Forgetting rental return dates. A crane that sits a week past the last pick costs real money.
  3. Leaving the site before the punch list is done, then paying to remobilize a small crew for two days of punch work.
  4. Not documenting owner-caused remobilizations as change orders.

Related terms

See general conditions, closeout, final completion, and front-loading. Smart Business Automator tracks equipment and rental costs against each job, so demob costs land in job costing and WIP on the right job.

Frequently asked questions

What is the difference between mobilization and demobilization?

Mobilization is getting set up at the start of a job. Demobilization is tearing down and leaving at the end. Both are often priced together, but they happen months apart.

Is demobilization billable?

It is billable when it is in the contract, either as its own line item or as part of a mobilization item. If it is not priced, the cost comes out of margin.

What if the owner makes us leave and come back?

An owner-caused demobilization and remobilization is usually a change in the work. Document the direction in writing and submit a change order request with the trucking, labor, and rental costs.

Does demobilization include final cleaning?

It depends on the contract. Many specifications treat final cleaning as a separate closeout requirement. Read the spec section that defines mobilization and demobilization.

Sources

  1. Acquisition.gov: DFARS 252.236-7004 Payment for Mobilization and Demobilization
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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