14 Castle Street Mumbles Swansea SA3 4BH Data via plota.co.uk

2026/1663/FUL - Full Plans Being Considered

Proposal

Garage conversion to garden room with covered decked area & full height side privacy screen and rear steps. Data via plota.co.uk

View original council record ↗Last checked

Application progress

✓
Received
8 Oct 2026
✓
Consultation
22 Oct 2026
Decision
Expected by 3 Dec 2026

Under consideration

No decision has been issued yet. Plota predicts a decision around 28 Nov 2026, from Swansea's recent extensions.

Comments are open until 13 Nov 2026

Comment on this application ↗

Site constraints 5

Mumbles conservation area
Demolition needs planning permission and permitted development is restricted.
The council must give weight to preserving or enhancing the area's character and appearance. Not every council has published its boundaries as open data.
Scheduled monument 105 m away: Oystermouth Castle
Its setting is a consideration for work nearby.
Nationally important archaeology protected by the Secretary of State. Work that affects the monument or its setting is rarely permitted.
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 ↗
Also on the record
SSSI 212 m away: Oystermouth Old Quarry; 4 listed buildings within 150 m.
Not affected
Outside flood zones 2 and 3

Checked on 10 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 2

Last sold for £387,500 in February 2024. Terraced house, freehold.

12 February 2024£387,500
10 December 1999£75,000

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
PropertyMid-terrace house, 4 habitable rooms
Built1900 to 1929
HeatingBoiler and radiators, mains gas
WallsSolid brick, as built, no insulation (assumed)

From the energy performance certificate lodged in June 2023, the latest held for this property. The building may have changed since. View the certificate

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Important details

Council
Swansea
Application type
Full Plans
Postcode
SA3 4BH
Received
8 Oct 2026
Validated
8 Oct 2026
Ward
Mumbles - Area 2
Parish
Mumbles Community Council
Case officer
Show
Target decision
3 Dec 2026
Applicant
Show
Agent
Rewbridge Design Ltd

Decision outlook

Day 20 of the 56-day target. Swansea usually decides extensions by day 51.

Day 2036 days to the 56-day target
75%decided within 8 weeks
83%approved
484decided in the last year

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

Public comments

No public comments yet.

3 neighbours consulted · Last counted 25 Oct 2026

Read the comments on the council site ↗

Consultation & key dates

Alt. reference
PP-15283033
Planning Portal ref
PP-15283033
Neighbours
12 Oct 2026
Consultation
22 Oct 2026
Comments by
13 Nov 2026
Site or press notice
23 Oct 2026
Statutory expiry
3 Dec 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.

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.