20 Williams Terrace Treharris CF46 5HH

1. 15 Jul 2026

   Received by Merthyr Tydfil

2. 28 Jul 2026

   Added to PlanIndex

3. 12 Aug 2026

   Status changed to Unknown

4. Decision

   Awaiting decision

   Decision expected by 9 September 2026, 8 weeks from validation under the statutory target for most applications. Extensions of time are common and are agreed case by case.

   Merthyr Tydfil took a median of 48 days over the applications it decided in the last year.

The published feed does not show a live status for this application; the register on Merthyr Tydfil's own portal holds the authoritative version.

A full application seeks permission for a complete, detailed proposal in one go, with siting, design, access and landscaping all fixed at this stage. More in our guide to planning application types.

• Former Offices Off Williams Terrace Treharris CF46 5HH

  P/23/0198 Submitted 18 Aug 2023 50 yards away

  Change of use from offices to 4 no. flats, with external alterations

  Granted Full applications New dwelling 13 docs
  Several homes

• 51 Perrott Street Treharris CF46 5ET

  P/25/0280 Submitted 22 Oct 2025 100 yards away

  The change of use of ground floor from a shop (A1) to a self-contained flat (C3).

  Granted Full applications 13 docs

• 15 Bargoed Terrace Treharris CF46 5RB

  P/26/0105 Submitted 12 May 2026 100 yards away

  Conversion of ground floor to Bakery & Coffee Shop. Conversion of first floor to self-contained two-bedroom flat with new rear access stairway

  Refused Full applications 12 docs

• 57 Fell Street Treharris CF46 5HN

  P/26/0234 Submitted 21 Oct 2026 150 yards away

  91% historically approved · decision due ~16 Dec

  Erection of conservatory to rear elevation

  Awaiting decision Extension

• Former Treharris Rugby Club Perrott Street Treharris CF46 5ET

  P/26/0214 Submitted 1 Oct 2026 150 yards away

  91% historically approved · decision due ~26 Nov

  Non-material amendment to planning permission P/23/0080 involving changes to the internal layout and the position of windows.

  Awaiting decision Windows or glazing

• 6 - 8 Perrott Street Treharris CF46 5ET

  P/25/0325 Submitted 27 Nov 2025 150 yards away

  Discharge of conditions 4 Knotweed and 5 Construction method Statement

  Granted Conditions 12 docs

• P/26/0176 Status unknown

  36 Berry Square Dowlais Merthyr Tydfil CF48 3AL

  Erection of two storey side extension, and the repositioning of parking area and vehicular entrance.

  Received 23 Sep, published by the council 13 Aug 2026 Full applications
• P/26/0189 Status unknown

  National Grid Electricity Distribution South Wales Dowlais Grid Substation Pengarnddu Dowlais Merthyr Tydfil

  Removal of the existing tower and installation of new tower with new antennas and transmission dishes, emergency back up generator, cable gantry, feeder cables and associated access track, etc.

  Received 25 Aug, published by the council 2 Sep 2026 Full applications
• P/26/0078 Granted

  73 Nightingale Street Abercanaid Merthyr Tydfil CF48 1EJ

  Single storey rear extension

  Received 13 Apr, published by the council 28 Jul 2026 Full applications
• P/26/0098 Granted

  25 Heather Court Quakers Yard Treharris CF46 5RP

  Erection of single storey extension

  Received 12 May, published by the council 28 Jul 2026 Full applications
• P/26/0096 Granted

  61 High Street Merthyr Tydfil CF47 8DE

  Change of use from shop to pilates studio/health suite/shop and replacement shop front

  Received 30 Apr, published by the council 28 Jul 2026 Full applications