17 Treorky Street Cathays Cardiff CF24 4JP

1. 29 Dec 2025

   Received by Cardiff

2. 23 Mar 2026

   Decision issued: Permission Granted

3. 22 Jul 2026

   Added to PlanIndex

Cardiff granted permission on 23 March 2026, subject to any conditions on the decision notice. Work must normally begin within five years or the permission lapses. More in our guide to what happens after a planning decision.

Householder applications cover work to an existing house and its garden, such as extensions, lofts and outbuildings, and cannot create a separate dwelling or change what the building is used for. More in our guide to planning application types.

• 6B Merthyr Street Cathays Cardiff CF24 4JJ

  26/00978/CLEUD Submitted 11 May 2026 50 yards away

  Use of the property as two self-contained flats.

  Granted Lawful development New dwelling 10 docs

• 19 Treherbert Street Cathays Cardiff CF24 4JN

  26/01363/CLEUD Submitted 1 Jul 2026 50 yards away

  Use of the property as a Sui Generis House in Multiple Occupation (HMO).

  Granted Lawful development 5 docs

• 12 Merthyr Street Cathays Cardiff CF24 4JJ

  23/00046/CLD Submitted 9 Jan 2023 50 yards away

  GROUND FLOOR REAR EXTENSION AND DORMER LOFT CONVERSION TO EXISTING CLASS C4 HOUSE IN MULTIPLE OCCUPATION

  Granted Lawful development Extension Loft or dormer 7 docs

• 27 Minister Street Cathays Cardiff

  25/00641/FUL Submitted 14 Mar 2025 50 yards away

  Proposed ground floor extension and alterations to existing flats.

  Granted Full applications New dwelling Extension 13 docs

• 29 Merthyr Street Cathays Cardiff CF24 4JL

  21/01356/MNR Submitted 26 May 2021 50 yards away

  USE AS A LARGE SUI GENERIS HOUSE OF MULTIPLE OCCUPATION

  Granted Lawful development 6 docs

• 3 Treherbert Street Cathays Cardiff CF24 4JN

  22/03041/FUL Submitted 21 Dec 2022 50 yards away

  GROUND AND FIRST FLOOR REAR EXTENSIONS, REAR DORMER AND CONVERSION TO CLASS C4 HOUSE IN MULTIPLE OCCUPATION

  Granted Full applications Extension Loft or dormer 8 docs

• 26/02112/HSE Awaiting decision

  7 Penydarren Drive Whitchurch Cardiff CF14 2TT

  Proposed Single Storey Side/Rear Extension with Garage Conversion

  Received 7 Oct, published by the council 9 Oct 2026 Householder
• 26/02113/HSE Awaiting decision

  78 Mill Road Lisvane Cardiff CF14 0UG

  PROPOSED FIRST FLOOR EXTENSION AT SIDE OF HOUSE

  Received 7 Oct, published by the council 9 Oct 2026 Householder
• 26/01702/HSE Granted

  45 Gwern Rhuddi Road Cyncoed Cardiff CF23 6PS

  Two storey and single storey rear extensions (development similar to that as approved under 25/00533/HSE with additional first floor part).

  Received 10 Aug, published by the council 24 Aug 2026 Householder
• 26/02104/HSE Awaiting decision

  15 Brynteg Rhiwbina Cardiff CF14 6TS

  Proposed single storey rear extension to the existing semi-detached dwelling including minor internal and external modifications

  Received 6 Oct, published by the council 9 Oct 2026 Householder
• 26/02102/HSE Awaiting decision

  49 Kimberley Road Penylan Cardiff CF23 5DL

  Proposed ground floor rear side return extension

  Received 6 Oct, published by the council 9 Oct 2026 Householder