138A Llandaff Road Riverside Cardiff CF11 9PW Data via plota.co.uk

26/01960/FUL - Full Planning Permission Registered

Proposal

Rear/side dormer loft conversion and rear balcony. Data via plota.co.uk

View original council record ↗Last checked

Application progress

✓
Received
11 Sept 2026
✓
Validated
23 Sept 2026
✓
Consultation
24 Sept 2026
Decision
Expected by 18 Nov 2026

Under consideration

No decision has been issued yet. Plota predicts a decision between 4 Nov 2026 and 16 Nov 2026, from Cardiff's recent extensions.

Comments are open until 15 Oct 2026

Comment on this application ↗

Site constraints 4

Flood zone 2, rivers and sea
Medium chance: between a 1 in 100 and 1 in 1,000 annual chance from rivers, or 1 in 200 to 1 in 1,000 from the sea. Any development here needs a flood risk assessment. Defences are not counted.
The Environment Agency flood map for planning. Homes in zone 3 must also pass the sequential test. Surface water flooding is a separate map.
Flood map ↗
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
Registered park or garden 137 m away: Thompson's Park (Sir David's Field); Conservation area 61 m away: Conway Road.
Not affected
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 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 3

Last sold for £250,000 in November 2015. Flat or maisonette, leasehold.

More than one property is recorded at this address: HM Land Registry does not always give the flat or unit.

24 November 2015£250,000
26 March 2004£180,000Terraced house
1 December 1997£150,000Semi-detached house, freehold

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

Building

Floor area120 m² (1,292 sq ft)
Energy ratingE (45 out of 100), could reach C
PropertySemi-detached maisonette, 4 habitable rooms
Built1900 to 1929
HeatingBoiler and radiators, mains gas
WallsSandstone, as built, no insulation (assumed)

From the energy performance certificate lodged in September 2014, the latest held for this property. The building may have changed since. View the certificate

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Important details

Council
Cardiff
Application type
Full Planning Permission
Postcode
CF11 9PW
Received
11 Sept 2026
Validated
23 Sept 2026
Ward
RIVERSIDE
Case officer
Show
Applicant
Show
Agent
DTB Design

Decision outlook

Day 16 of the 56-day target. Cardiff usually decides extensions by day 49.

Day 1640 days to the 56-day target
69%decided within 8 weeks
94%approved
574decided in the last year

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

Public comments

No public comments yet.

5 neighbours consulted · Last counted 2 Oct 2026

Read the comments on the council site ↗

Consultation & key dates

Neighbours
24 Sept 2026
Consultation
24 Sept 2026
Comments by
15 Oct 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.