P/25/0237

1. 2 Sep 2025

   Received by Merthyr Tydfil

2. 14 Oct 2025

   Decision issued: Certificate of Law Granted

3. 28 Jul 2026

   Added to PlanIndex

Permission has been granted, usually subject to conditions listed on the decision notice, some of which must be discharged before work starts. The decision notice on the council portal sets out exactly what was approved.

Work must normally begin within five years of the decision or the permission lapses. Neighbours cannot appeal a grant; challenging one means judicial review of how the decision was made, within tight time limits.

A lawful development certificate is a legal determination, not a planning judgement. It asks the council to confirm either that existing use or works are lawful, often through the passage of time, or that a proposal would not need planning permission at all. The applicant must prove the facts; the merits of the scheme are not considered.

More on lawful development applications in our guide

• P/26/0156 Status unknown

  Ysgol Rhyd Y Grug Primary School Aberfan Crescent Aberfan Merthyr Tydfil CF48 4NT

  Discharge condition 10 (Construction Traffic Management Plan) of planning permission P/25/0048.

  13 Jul 2026 277m away Conditions
• P/26/0093 Granted

  Cartrefle Station Hill Aberfan Merthyr Tydfil CF48 4PR

  Vary condition 2 of planning permission P/25/0316 to allow for the erection of an additional dormer to the front roof elevation

  1 May 2026 288m away Amendments
• P/25/0316 Granted

  Cartrefle Station Hill Aberfan Merthyr Tydfil CF48 4PR

  Proposed front dormer windows, demolition of existing storage sheds and new garage and store

  25 Nov 2025 290m away Full applications
• P/26/0032 Status unknown

  Greenwich House Aberfan Road Aberfan Merthyr Tydfil CF48 4QN

  Change of use from dwelling (C3) to small HMO (C4)

  20 Feb 2026 409m away Full applications
• P/25/0333 Refused

  44 Aberfan Road Aberfan Merthyr Tydfil CF48 4QL

  Change of use from residential dwelling house (C3) to house of multiple occupation (C4)

  10 Dec 2025 491m away Full applications

• P/26/0150 Granted

  45 Taldwyn Terrace Merthyr Road Troedyrhiw Merthyr Tydfil CF48 4JL

  Rear dormer roof extension (lawful development certificate)

  7 Jul 2026 Lawful development
• P/26/0132 Granted

  Cotham Heol-y-mynydd Cefn Coed Merthyr Tydfil CF48 2NQ

  Lawful Development Certificate for a proposed single storey rear extension

  17 Jun 2026 Lawful development
• P/26/0161 Status unknown

  Cefn Fforest Farm Twynygarreg Treharris CF46 5RN

  Lawful Development Certificate for proposed assorted extensions and works

  15 Jul 2026 Lawful development
• P/26/0088 Granted

  44 Webster Street Treharris CF46 5HP

  New solar panels to the rear of the property

  29 Apr 2026 Lawful development
• P/26/0081 Granted

  Penbwlcha Farm Treharris CF46 5RN

  Certificate of lawfulness for the siting of an existing caravan and its proposed residential use ancillary to the main dwelling.

  30 Apr 2026 Lawful development