4 Trenethick Avenue Helston Cornwall TR13 8LU Data via plota.co.uk

Decided PA25/06667
Appeal
Allowed · 5 Mar 2026 · Written Representations · Inspectorate case 6001823 ↗
Council
Cornwall 7.9/10
Date received
around 3 Sept 2025
Date validated
3 Sept 2025
Postcode
TR13 8LU

Description

Proposed extension and alterations Data via plota.co.uk

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Last checked

Site constraints 3

Radon affected area, class 6
An estimated 30% or more 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 ↗
Also on the record
Inside the Helston built-up area; Natural England's Provisional ALC map (1:250,000, 1970s) had this area as grade 2, but it predates the buildings here and the current map does not class it as farmland.
Not affected
Outside flood zones 2 and 3 · Not green belt · No scheduled monument at the site

Checked on 11 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.

Sales history 4

Last sold for £375,000 in October 2023. Detached house, freehold.

31 October 2023£375,000
28 February 2002£150,000
22 September 2000£121,500
3 March 1997£80,000

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

Building

Floor area103 m² (1,109 sq ft)
Energy ratingC (71 out of 100), could reach B
PropertyDetached bungalow, 5 habitable rooms
Built1967 to 1975
HeatingBoiler and radiators, mains gas
WallsCavity wall, filled cavity

From the energy performance certificate lodged in August 2023, the latest held for this property, matched to this application by its address. The building may have changed since. View the certificate

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29 May 2026Decided

13 Trenethick Avenue Helston Cornwall TR13 8LU

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Historical activity at this location

8 nearby applications on record - archival context, not part of the live application.

Within ~100m

Nearby activity

2024 Approved
36 Trenethick Parc Helston Cornwall TR13 8LT
Proposed extension and alterations.
PA24/03260
2022 Approved
14A Trenethick Avenue Helston Cornwall TR13 8LU
Retrospective retention of widened driveway for access and parking
PA22/07488
2021 Approved
19 Trenethick Avenue Helston TR13 8LU
Erection of an Edwardian style conservatory.
PA21/12590
2019 Approved
18 Trenethick Avenue Helston Cornwall TR13 8LU
Domestic extensions and alterations.
PA19/07692
2018 Approved
15 Trenethick Avenue Helston TR13 8LU
Demolition of garage & construction of two storey extension (revised PA18/02411)
PA18/05312
2018 Withdrawn
15 Trenethick Avenue Helston TR13 8LU
Extension comprising of garage conversion and construction of new garage
PA18/02411
2016 Approved
98 Tremenheere Avenue Helston Cornwall TR13 8TR
Notification for prior approval for a proposed larger home extension.
PA16/00757
2016 Approved
98 Tremenheere Avenue Helston Cornwall TR13 8TR
Proposed extension
PA16/02740
Cornwall
Planning Authority Score
7.9/10
Good
#28 of 296 councils
Relevant to this application:
Householder decisions

Cornwall is faster than most councils at deciding householder applications, ranking #64 out of 296. Householder applications are more likely to be approved here than most councils, with a 97% approval rate vs 90% nationally.

More permissive than most councils
97% approved vs 90% nationally
These figures are council-wide context, not a prediction for this application. View full council performance
Cornwall decision statistics
Based on MHCLG data, the year to March 2026
92%
Overall approval rate
Above avg (87%) #79 of 296
97%
Householder approved
Above avg (90%) #28 of 296
76%
Decided in 8 weeks
Above avg (63%) #64 of 296
35%
Extended time limit
Below avg (41%) #101 of 296
82%
Minor dwellings approved
1180 decided (1-9 homes)
94%
Major dwellings approved
67 decided (10+ homes)
93%
Change of use approved
194 decided
4,839
Total decisions
363 refused in the year to March 2026
Source: MHCLG planning statistics · See full council rankings

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

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.