3 Tyn-y-coed Road Pentyrch Cardiff CF15 9NP Data via plota.co.uk

26/01747/HSE - Householder Planning Permission Approved

Proposal

Timber garden room/orangery attached to Front Elevation. Data via plota.co.uk

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View original council record ↗Last checked 8 Oct 2026, 01:20

Street View

Application progress

✓

Received

17 Aug 2026

✓

Consultation

20 Aug 2026

✓

Approved

30 Sept 2026

Approved on 30 Sept 2026 · Delegated to Group Leader · Last checked 4 Oct 2026

Documents 4

Site constraints 3

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 140 m away: Caeau Blaen-bielly

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.

Also on the record

Coalfield, development low risk area.

Not affected

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

Checked on 6 October 2026. Historic England, the Environment Agency, Natural England, the Mining Remediation Authority, 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.