Thirlmere Pentwyn Deintyr Treharris CF46 5EA

1. 26 Apr 2021

   Received by Merthyr Tydfil

2. 17 Jun 2021

   Decision issued: Certificate of Law Granted

3. 16 Sep 2026

   Added to PlanIndex

Merthyr Tydfil granted permission on 17 June 2021, 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.

• 10 Pentwyn Deintyr Treharris CF46 5EA

  P/25/0320 Submitted 26 Nov 2025 156m away

  Discharge of condition 3 (Biodiversity enhancement) of planning permission P/24/0121

  Granted Conditions 5 docs

• 12 Tramroadside Treharris CF46 5EF

  P/25/0295 Submitted 11 Nov 2025 184m away

  Side and rear extension

  Granted Full applications Extension 17 docs

• Land Adjacent To 3 Tramroadside Treharris

  P/21/0190 Submitted 27 May 2021 290m away

  Discharge of conditions 3 (material finishes, 4 (boundary treatment), 5 (drainage), 6 (retaining works), 7 (landscaping) and 9 (construction method statement) of planning permission P/16/0191 for a dwelling

  Granted Conditions 5 docs
  Domestic

• Berthlwyd Farm Pentwyn Road Treharris CF46 5BS

  P/25/0221 Submitted 8 Aug 2025 420m away

  Retention of barn conversion (curtilage listed) to 2 no. holiday lets.

  Granted Heritage and listed buildings 16 docs

• Land Adjacent Lock House Abercynon Mountain Ash

  25/0984/TEL Submitted 25 Sep 2025 421m away

  Install fixed line broadband apparatus - 1 x 10m medium pole

  Granted Telecoms

• Berthlwyd Farm Pentwyn Road Treharris CF46 5BS

  P/26/0069 Submitted 2 Apr 2026 421m away

  Discharge of Condition 5 of P/25/0219 vehicle hard standing

  Granted Conditions 5 docs

• 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
• P/25/0338 Refused

  68 - 70 Brecon Road Merthyr Tydfil CF47 8NN

  Use of the property as a House in Multiple Occupancy (HMO)

  18 Dec 2025 Lawful development
• P/26/0074 Granted

  Unit 4 Pengarnddu Industrial Estate Dowlais Merthyr Tydfil CF48 2TA

  Installation of Solar PV panels to roof

  8 Apr 2026 Lawful development
• P/26/0050 Granted

  17 Parc Cwm Pant Bach Heolgerrig Merthyr Tydfil CF48 1TQ

  Certificate of Lawfulness for single storey rear extension

  12 Mar 2026 Lawful development