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Key definition
Developments of national significance definition

What does Developments of national significance mean? Developments of national significance (DNS) are applications for specified infrastructure projects in Wales that are determined by the Welsh Ministers, rather than the local planning authority. The term and thresholds are set by the Planning (Wales) Act 2015 and secondary legislation specifying the categories of development within the regime. Key features include a centralised decision-making process, pre-application consultation, examination by Planning and Environment Decisions Wales (PEDW), a Local Impact Report from the affected authority, and a ministerial decision. The Welsh Ministers may determine prescribed secondary consents. There is no right of appeal; decisions are challengeable by judicial review. The DNS regime...

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Developments of National Significance (DNS) in Wales: transitional regime following the Infrastructure (Wales) Act 2024—scope, procedures, secondary consents, compulsory purchase and legal challenge

Practice notes
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The Infrastructure (Wales) Act 2024 (I(W)A 2024) received Royal Assent on 3 June 2024. From 15 December 2025, a single, unified consenting route for infrastructure was brought into force which, for specified categories of significant infrastructure projects, supersedes the developments of national significance (DNS) process. This Practice Note sets out the DNS regime and the way it continues to apply under the transitional and saving provisions in I(W)A 2024, s 146 and supporting regulations. For details of the new infrastructure consent regime, see Practice Note: Infrastructure consent in Wales.

Developments of National Significance in Wales

Status of DNS following the Infrastructure (Wales) Act 2024

From 15 December 2025, new proposals that fall within the significant infrastructure projects (SIPs) categories in I(W)A 2024 will generally require infrastructure consent instead of planning permission under the DNS route. The DNS procedure remains available only where a proposal is captured by the transitional and saving provisions in I(W)A 2024, s 146 and the related regulations...

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Web page updated on 21/05/2026

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