13 Knowbury Avenue, Penarth Data via plota.co.uk

2026/00547/FUL - Full Planning Application Approved

Proposal

New garden room in rear garden. Data via plota.co.uk

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View original council record ↗Last checked 8 Oct 2026, 01:15

Application progress

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Received

16 Jul 2026

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Approved

16 Sept 2026

Approved on 16 Sept 2026 · Delegated · Last checked 24 Sept 2026

Documents 9

Site constraints 3

Local nature reserve about 160 m away: Severn Estuary (Wales)

Work nearby can need a habitats assessment.

Harm to a protected site is only accepted where there is no alternative and an overriding public interest.

Radon affected area, class 5

An estimated 10 to 30% of homes reach the radon action level. Indicative for the 1 km square, which takes the highest class found in it; a radon test gives the answer for a building.

From the British Geological Survey and UK Health Security Agency indicative atlas. Under building regulations, as the BRE guide BR 211 (2023) sets out, new buildings and extensions need basic radon protection from class 3 in England and Wales and from class 2 in Scotland, and full protection from class 5. The class at the site itself, from the detailed BGS map, decides which.

UKHSA radon ↗

SSSI about 138 m away: Penarth Coast

Natural England may need consulting, depending on what is proposed.

Sites of special scientific interest are the best wildlife and geological sites in the country. Development likely to harm one is rarely permitted.

Not affected

Outside flood zones 2 and 3 · No scheduled monument at the site

Checked on 6 October 2026. The pin for this application is the centre of its postcode rather than the building, so distances to nearby designations are measured from the postcode and can be out by the width of the postcode area. Historic England, the Environment Agency, Natural England, the British Geological Survey and UK Health Security Agency (radon, contains BGS materials © UKRI) and council datasets, Open Government Licence. A boundary can run through a site and the council holds the definitive record: confirm with the council before relying on this.

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