23 Knoxhill Avenue, Londonderry, BT47 2PN Data via plota.co.uk

Decided LA11/2025/0261/F - Full

Appeal: Dismissed · 16 Jun 2026 · Written Representations · Inspectorate case 6004316 ↗

Council

Derry and Strabane

Date received

9 Apr 2025

Date validated

9 Apr 2025

Decision date

1 Aug 2025

Postcode

BT47 2PN

Type

Full

Description

Single storey extensions to gable and rear of dwelling and associated internal alterations Data via plota.co.uk

Get alerts nearby Council site ↗

Last checked 14 Oct 2026, 06:41

Site constraints 1

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 ↗

Not affected

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

Checked on 14 October 2026. 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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