18 Redbrook Avenue Trethomas Caerphilly CF83 8DB Data via plota.co.uk

26/0505/HH - Householder Application Approved

Proposal

Erect split level two storey extension to rear of property Data via plota.co.uk

View original council record ↗Last checked

Application progress

✓
Received
30 Jul 2026
✓
Consultation
3 Aug 2026
✓
Approved
23 Sept 2026

Approved on 23 Sept 2026 · Delegated · Last checked 24 Sept 2026

Site constraints 2

Coal mining development high risk area
Recorded coal mining features at or near the surface. Most planning applications here need a coal mining risk assessment.
From the Mining Remediation Authority, formerly the Coal Authority. The development high risk area marks recorded coal mining features at or near the surface: mine shafts and adits, shallow workings, mine gas and former opencast sites. Most planning applications there need a coal mining risk assessment; householder applications, changes of use and some minor works are exempt. Mine entry positions come from old plans and can be out by several metres, and unrecorded workings can exist anywhere in the coalfield.
Coal mining risk assessments ↗
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 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.

Sales history 2

Last sold for £148,000 in January 2018. Semi-detached house, freehold.

22 January 2018£148,000
24 June 2011£68,450

Sale prices from HM Land Registry's price paid record, matched to this application by its address.

Building

Floor area89 m² (958 sq ft)
Energy ratingD (57 out of 100)
PropertySemi-detached house, 6 habitable rooms
Built1950 to 1966
HeatingBoiler and radiators, mains gas
WallsCavity wall, filled cavity

From the energy performance certificate lodged in June 2011, the latest held for this property. The building may have changed since. View the certificate

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Important details

Council
Caerphilly
Application type
Householder Application
Postcode
CF83 8DB
Received
30 Jul 2026
Validated
30 Jul 2026
Ward
Bedwas And Trethomas
Case officer
Show
Target decision
24 Sept 2026
Decision
Granted
Decision date
23 Sept 2026
Decision level
Delegated
Applicant
Show

How this decision compares

Decided in 55 days from validation, about the council's usual 53 days. Approved, as 76% of extensions here are.

75%decided within 8 weeks
76%approved
195decided in the last year

Plota live figures for extensions decided by Caerphilly in the last twelve months, from validation. Caerphilly decision record →

Public comments

No public comments yet.

6 neighbours consulted · Last counted 24 Sept 2026

Read the comments on the council site ↗

Consultation & key dates

Alt. reference
PP-15119662
Planning Portal ref
PP-15119662
Neighbours
3 Aug 2026
Consultation
3 Aug 2026
Comments by
24 Aug 2026
Statutory expiry
24 Sept 2026
Env. assessment
No

Sale prices: Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0.

Freehold boundary: © Crown copyright and database rights 2026, HM Land Registry. Polygons © Crown copyright and database rights 2026 Ordnance Survey 100026316. Conditions of use

Energy performance: Energy performance certificates from the Energy Performance of Buildings Register, Ministry of Housing, Communities and Local Government. Contains public sector information licensed under the Open Government Licence v3.0. © Crown copyright 2026.