Jurisdiction(s):
United Kingdom

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Key definition

Slip rule definition

What does Slip rule mean? Slip rule describes the limited power to correct accidental slips or clerical mistakes in a judgment, order, award or adjudication decision—such as typographical, transcription or arithmetic errors—so the written outcome reflects the decision-maker’s original intention. It does not permit a change of mind, new reasoning, or a substantive re‑determination. In court proceedings this power is rule-based (for example, CPR 40.12 in England and Wales, with equivalent provisions in Scotland and Northern Ireland, and Order 28 rule 11 of the Irish Rules of the Superior Courts). Similar “slip” powers exist in arbitration (e.g. under the Arbitration Act 1996) and across tribunals. In...

Construction adjudication slip rule: scope, time limits and case law on correcting decisions under HGCRA 1996 and the Scheme (England, Wales and Scotland)

Published by a LexisNexis Construction expert

Practice notes

slip rule

An adjudicator may, within a reasonable period after handing down their decision, put right any accidental error or omission. Commonly described as the ‘slip rule’, it operates where the adjudicator’s mistake is an inadvertent slip that fails to capture their first intention. Though this principle was implied by common law in the absence of any contrary agreement, it is now set out expressly in section 108(3A) of the Housing Grants, Construction and Regeneration Act 1996 (HGCRA 1996). Section 108(3A) was introduced by the Local Democracy, Economic Development and Construction Act 2009 and applies to contracts entered into on or after 1 October 2011 in England and Wales, and on or after 1 November 2011 in Scotland. Under HGCRA 1996, s 108(3A), a contract must contain a written term permitting the adjudicator to correct their decision so as to remove a clerical or typographical error arising by accident or omission...

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Web page updated on 21/05/2026

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