Nationally significant infrastructure projects: advice on cumulative effects assessment

Publication Year

2026

Document Status

Current

Abstract

Provides advice on Nationally Significant Infrastructure Projects (NSIPs) with regard to the process for undertaking cumulative effects assessment. Covers: legal and policy requirements for cumulative effects assessment; interrelationships and combined effects; consideration of cumulative effects in screening Schedule 2 development; overview of the cumulative effects assessment process; Stage 1: establishing the long list of other existing and, or approved development; Stage 2: establishing a shortlist of other existing and, or approved development; Stage 3: information gathering; and Stage 4: assessment.

Document History

Last updated: 14 July 2026 - Updated preamble to remove reference to publication of advice page(s) under s51 of the Planning Act 2008. Sourced from: https://www.gov.uk/guidance/nationally-significant-infrastructure-projects-advice-on-cumulative-effects-assessment and converted to pdf. Whilst we endeavour to capture all updates it is subject to receiving alerts from the publisher and there may be formatting or punctuation changes applied to the html version that do not affect the text. Document type: guidance. First published: 20 September 2024.

Publisher Information