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Planning application

40 Sierra Pines Mountain Ash Rhondda Cynon Taf CF45 3DS

Granted Rhondda Cynon Taf 25/1064/FUL Full Application

Works: Extension

Permission granted. Work must normally begin within five years of the decision or the permission lapses.

Proposal

Construction of 2 storey duo-pitch extension to side elevation as a granny annexe

As published by the council, reference 25/1064/FUL

Application record

Reference
25/1064/FUL
Type
Full Application
Status
Decided
Decision
Granted As published: Approve
Received
16 Oct 2025
Validated
28 Oct 2025
Decided
12 Dec 2025
Ward
Mountain Ash
Decision by
Delegated Decision
Postcode
CF45 3DS

Site history

Applications at this address on the Rhondda Cynon Taf register

This site has had 2 applications since 2025: 2 approved, 0 refused.

  • 26/0137/RVOC Granted

    40 Sierra Pines Mountain Ash Rhondda Cynon Taf CF45 3DS

    Variation of condition 7 and removal of conditions 5 and 6 of previous permission 25/1064/FUL

    Decided 10 Apr 2026 Amendments

Timeline

Dates from the published record

  1. 16 Oct 2025

    Received by Rhondda Cynon Taf

  2. 28 Oct 2025

    Validated

    Checked as complete and ready for consideration.

  3. 12 Dec 2025

    Decision issued: Approve

  4. 28 Jul 2026

    Added to PlanIndex

Cases linked to this one on the register

1 later application on the register refers to this one:

  • 26/0137/RVOC Granted

    40 Sierra Pines Mountain Ash Rhondda Cynon Taf CF45 3DS

    Variation of condition 7 and removal of conditions 5 and 6 of previous permission 25/1064/FUL

    Decided 10 Apr 2026 Amendments

Documents

Plans, drawings, consultee responses and the officer's report

9 documents on file for this application

  • HIGHWAYS RESPONSE CONSULTN · 27 Nov 2025
  • LOCATION PLAN AMDPLAN · 23 Oct 2025
  • CROSS SECTION PLAN AMDPLAN · 23 Oct 2025
  • EXISITING GROUND FLOOR PLAN AMDPLAN · 23 Oct 2025
  • EXISITNG FIRST AND SECOND FLOOR PLAN AMDPLAN · 23 Oct 2025
  • PROPOSED FIRST FLOOR PLAN AMDPLAN · 23 Oct 2025
  • PROPOSED FLOOR PLAN AMDPLAN · 23 Oct 2025
  • EXISTING ELEVATION AMDPLAN · 23 Oct 2025
  • PROPOSED ELEVATIONS AMDPLAN · 23 Oct 2025

Watch members (£5 a month) open the document list from here.

Open the documents

What this grant of permission means

Rhondda Cynon Taf granted permission on 12 December 2025, 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.

About full applications

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.

Nearby applications

Within 0.3 miles

  • 40 Sierra Pines Mountain Ash Rhondda Cynon Taf CF45 3DS

    26/0137/RVOC Submitted 17 Feb 2026 50 yards away

    Variation of condition 7 and removal of conditions 5 and 6 of previous permission 25/1064/FUL

    Granted Amendments 3 docs

  • 38 Sierra Pines Mountain Ash CF45 3DS

    05/1789/FUL Submitted 27 Sep 2005 50 yards away

    Two storey extension to match all existing finishes. Remove existing garage door. Replace with window and brickwork to match existing.

    Granted Full applications Extension Windows or glazing

  • Llethrau 5 CWM Alarch Close Mountain Ash CF45 3DT

    21/0183/10 Submitted 9 Feb 2021 100 yards away

    Single storey extension to front of the property.

    Granted Full applications Extension 9 docs
    Small domestic

  • 6 Woodlands Cwm Alarch Close Glenboi Mountain Ash Rhondda Cynon Taf CF45 3DT

    26/0906/FUL Submitted 16 Oct 2026 100 yards away

    92% historically approved · decision due ~14 Dec

    Installation of an Air to Water heat pump, to replace a gas boiler for water & central heating

    Awaiting decision Full applications 6 docs

  • 8 Meadow Close Mountain Ash Rhondda Cynon Taf CF45 3DN

    25/0956/FUL Submitted 18 Sep 2025 200 yards away

    Proposed single-storey rear extension, with the demolition and relocation of the existing garage (additional plans received 15/10/2025)

    Granted Full applications Extension Demolition 9 docs
    Small domestic

  • 7 Meadow Close Mountain Ash Rhondda Cynon Taf CF45 3DN

    26/0905/FUL Submitted 15 Oct 2026 200 yards away

    92% historically approved · decision due ~10 Dec

    Proposed single storey rear extension and division of an existing dwelling into two separate dwellings.

    Awaiting decision Full applications Extension
    Small domestic

In Rhondda Cynon Taf

  • 26/0942/FUL Awaiting decision

    Performance Physiotherapy 31 Gelliwastad Road Pontypridd Rhondda Cynon Taf CF37 2BN

    Single storey rear extension.

    Received 29 Oct, published by the council 2 Nov 2026 Full applications
  • 26/0933/FUL Awaiting decision

    7 Graig Isaf Aberdare Rhondda Cynon Taf CF44 7RD

    Proposed dormer loft conversion to rear elevation

    Received 26 Oct, published by the council 28 Oct 2026 Full applications
  • 26/0928/FUL Awaiting decision

    176 Glan-y-ffordd Taff's Well Rhondda Cynon Taf CF15 7SP

    Wrap around single storey extension.

    Received 23 Oct, published by the council 28 Oct 2026 Full applications
  • 26/0927/FUL Awaiting decision

    57 Nythbran Terrace Porth Rhondda Cynon Taf CF39 9TP

    Proposed two storey rear extension.

    Received 23 Oct, published by the council 27 Oct 2026 Full applications
  • 26/0923/FUL Awaiting decision

    Former Gelliwion Quarry Gelliwion Road Maes-y-coed Pontypridd Rhondda Cynon Taf CF37 1EY

    Detached dwelling with off street parking and associated works

    Received 22 Oct, published by the council 2 Nov 2026 Full applications