Jurisdiction(s):
United Kingdom

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Key definition

Nationally Significant Infrastructure Projects definition

What does Nationally Significant Infrastructure Projects mean? In planning practice, Nationally Significant Infrastructure Projects are very large infrastructure schemes in England that meet statutory thresholds and are authorised by a single Development consent Order (DCO) under the planning act 2008. The term is defined in the Planning Act 2008 and covers specified sectors, including energy, transport, water, waste water and waste. Applications are examined by the Planning Inspectorate and determined by the relevant Secretary of State in accordance with designated National policy Statements. A DCO can consolidate related consents and confer compulsory acquisition powers. The regime requires pre‑application consultation and environmental assessment (EIA and, where...

Transport NSIPs in England and Wales under the Planning Act 2008: thresholds, Development Consent Orders, National Policy Statements, Secretary of State directions and one-stop shop consents

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Practice notes

Planning Act 2008

The Planning Act 2008 (PA 2008) established a distinct development consent system in England and Wales for nationally significant infrastructure projects (NSIPs) across energy, transport, water, waste water and waste. It was introduced to simplify, and provide greater certainty for, the consenting route for infrastructure considered to be of national importance.

Where development is, or includes, an NSIP, a development consent order (DCO) under PA 2008 is required instead of planning permission under the Town and Country Planning Act 1990 (TCPA 1990). PA 2008 identifies NSIPs as specified categories of project set out in section 14, with Part 3 of PA 2008 prescribing additional qualifying criteria for each category. When those criteria are satisfied, the project is an NSIP and the consent process must follow PA 2008; the local planning authority for the area hosting the development cannot determine a planning application for development that is, or forms part of, an NSIP.

For further information on the regime for all NSIPs, refer to Practice Notes: Permission for nationally significant infrastructure projects and National Policy Statements...

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Web page updated on 22/05/2026

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