18 Redbrook Avenue Trethomas Caerphilly CF83 8DB

1. 30 Jul 2026

   Received by Caerphilly

2. 7 Aug 2026

   Added to PlanIndex

3. Decision

   Awaiting decision

   Decision expected by 24 September 2026, 8 weeks from validation under the statutory target for most applications. Extensions of time are common and are agreed case by case.

   Caerphilly took a median of 55 days over the applications it decided in the last year.

This application is with Caerphilly for determination. The council publicises it, consults neighbours and technical bodies where required, and weighs the responses against local and national planning policy.

The statutory target is eight weeks for most applications and thirteen for major development, though extensions of time are common. Comments carry most weight while the case is undecided, so check the council portal for the deadline if you want to respond.

Householder applications cover work to an existing house and its garden: extensions, loft and garage conversions, porches, outbuildings and similar alterations within the boundary of the home. They cannot be used to create a separate dwelling or change what the building is used for. Councils aim to decide them within eight weeks, and immediate neighbours are usually notified and given a chance to comment.

More on householder applications in our guide

• 1 Lower Glyn-Gwyn Street Trethomas Caerphilly CF83 8GA

  23/0179/HH Submitted 7 Mar 2023 74m away

  Erect single storey rear extension

  Granted Householder Extension 11 docs
  Small domestic

• Ty Coch Newport Road Trethomas Caerphilly CF83 8GB

  25/0530/HH Submitted 30 Jul 2025 129m away

  Erect single storey garden room to the rear of the dwelling

  Granted Householder 13 docs
  Small domestic

• Nantgoch Newport Road Trethomas Caerphilly CF83 8GB

  24/0650/FULL Submitted 6 Sep 2024 194m away

  Demolish existing log cabin and replace with new building containing 2 x self-contained supported living units along with associated external works, the new building will serve as an Annex to the main building

  Refused Full applications Demolition 16 docs

• 12 Navigation Street Trethomas Caerphilly CF83 8DJ

  19/0916/RET Submitted 11 Nov 2019 278m away

  Retain detached outbuilding and rear timber fence

  Granted 7 docs
  Small domestic

• Land At Grid Ref 318341 189126 William Street Trethomas Caerphilly

  26/0201/RM Submitted 20 Mar 2026 288m away

  Seek approval of the reserved matters in respect of access, appearance, landscaping and layout of planning consent 25/0061/OUT (Erect up to 8 residential units and associated highway, drainage and landscape infrastructure)

  Granted Reserved matters 39 docs

• 3 Chapel Court Navigation Street Trethomas Caerphilly CF83 8FR

  24/0816/HH Submitted 8 Nov 2024 309m away

  Erect second storey side extension

  Granted Householder Extension 7 docs
  Domestic

• 26/0460/HH Refused

  2 Tan-y-llan Terrace Rhymney Tredegar NP22 5HE

  Erect first floor en-suite extension to rear bedroom

  7 Jul 2026 Householder
• 26/0578/HH Awaiting decision

  Ty Ar Y Graig Lower Road Elliot's Town New Tredegar NP24 6EB

  Erect single storey external canopy to side elevation

  2 Sep 2026 Householder
• 26/0384/HH Granted

  2 Ashgrove Hengoed CF82 7JN

  Erect two storey rear extension

  2 Jun 2026 Householder
• 26/0351/HH Refused

  Redbrook Newport Road Machen Caerphilly CF83 8RA

  Replace existing chainlink boundary fence with 1800mm timber fence

  20 May 2026 Householder
• 26/0159/HH Refused

  3 Heol Morien Nelson Treharris CF46 6JA

  Erect first floor rear extension

  5 Mar 2026 Householder