6B Merthyr Street Cathays Cardiff CF24 4JJ

1. 11 May 2026

   Received by Cardiff

2. 22 May 2026

   Validated

   Checked as complete and ready for consideration.

3. 17 Jun 2026

   Decision issued: Permission Granted

4. 22 Jul 2026

   Added to PlanIndex

Cardiff granted permission on 17 June 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.

A lawful development certificate is a legal determination that existing or proposed works do not need planning permission; the merits of the scheme are not considered. More in our guide to planning application types.

• 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

• 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

• 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

• 17 Treorky Street Cathays Cardiff CF24 4JP

  25/02997/HSE Submitted 29 Dec 2025 50 yards away

  Rear extension and dormer loft conversion.

  Granted Householder Extension Loft or dormer 7 docs
  Domestic

• 3 Treherbert Street Cathays Cardiff CF24 4JN

  22/03041/FUL Submitted 21 Dec 2022 100 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

• 61 Merthyr Street Cathays Cardiff CF24 4JL

  21/01351/MNR Submitted 26 May 2021 100 yards away

  USE AS A 7 BED SUI GENERIS HOUSE OF MULTIPLE OCCUPANCY

  Granted Lawful development 7 docs

• 26/01578/CLPUD Granted

  207 Fidlas Road Llanishen Cardiff CF14 5NA

  Proposed ancillary garden building

  Received 28 Jul, published by the council 6 Oct 2026 Lawful development
• 26/02084/CLPUD Awaiting decision

  24 Bassetts Field Rhiwbina Cardiff CF14 9UG

  Proposed single storey flat roof extension to rear

  Received 2 Oct, published by the council 6 Oct 2026 Lawful development
• 26/02050/CLPUD Awaiting decision

  First And Second Floor 85 Romilly Crescent Pontcanna Cardiff CF11 9NQ

  Change of use from Residential to C6 short-term let.

  Received 25 Sep, published by the council 6 Oct 2026 Lawful development
• 26/02053/CLPUD Awaiting decision

  32 Homelands Road Heath Cardiff CF14 1UJ

  Single storey rear extension.

  Received 24 Sep, published by the council 6 Oct 2026 Lawful development
• 26/01863/CLPUD Granted

  6 Llandennis Green Cyncoed Cardiff CF23 6JX

  Proposed conversion of existing integral garage to ancillary domestic accommodation, including minor internal alterations

  Received 4 Sep, published by the council 22 Sep 2026 Lawful development