Source: https://www.quantsurv.com/library/glossary/disruption
Content format: Markdown version of the public page.
Content reviewed: 2026-10-12

# Disruption

A loss of productivity caused by interference with the planned way of working; disruption can occur even when the completion date does not move.

by [Jack Butler-Kettle](<https://www.quantsurv.com/about#jack-butler-kettle>) · About 1 min readShare

## Further detail

Read this alongside [SCL Delay and Disruption Protocol](<https://www.scl.org.uk/sites/default/files/documents/SCL_Delay_Protocol_2nd_Edition_Final.pdf>).

Disruption concerns reduced efficiency in carrying out work. Examples of possible interference include fragmented access, repeated moves and changes to sequence. Extra hours alone do not prove that another party caused a recoverable loss. Compare actual output and resources, account for other causes and avoid costs already included in variation rates or another claim.

Keep labour allocation, installed quantities and the conditions in which the work was carried out. Use the [claim evidence course](<https://www.quantsurv.com/library/courses/claim-evidence>) to connect records to assertions and calculations. For an actual productivity claim, [Delay and disruption cost recovery](<https://www.quantsurv.com/claims?service=%2Fdelay-and-disruption%2Fservices%2Fdelay-disruption-recovery#client-types>) examines the cost, contractual basis and supporting records.

## Sources

1.  [Delay and Disruption Protocol, 2nd edition, February 2017](<https://www.scl.org.uk/sites/default/files/documents/SCL_Delay_Protocol_2nd_Edition_Final.pdf>). Society of Construction Law.

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