Welsh Slate Museum, GILFACH DDU, Llanberis, Caernarfon, Gwynedd, LL55 4TY

1. 18 May 2026

   Received by Gwynedd

2. 6 Aug 2026

   Added to PlanIndex

3. Decision

   Awaiting decision

   Decision expected by 13 July 2026, 8 weeks from validation under the statutory target for most applications. Extensions of time are common and are agreed case by case.

The published feed does not show a live status for this application, which usually means the council register holds more recent detail than the copy PlanIndex receives.

The council portal linked on this page carries the authoritative version, including the documents, any consultation deadline and the decision once made. PlanIndex refreshes its copy of the register on a daily cycle.

An amendment application changes a permission that already exists. Non-material amendments cover small adjustments with no wider effect, while minor material amendments, usually made by varying a condition, allow modest design changes without a fresh application. Anything beyond that needs a new permission, so the scope here is deliberately narrow.

More on amendments applications in our guide

• Padarn Country Park, Llanberis, Caernarfon, Gwynedd, LL55 4TY

  C26/0062/18/RA Submitted 2 Feb 2026 0m away

  Rhyddhau amod rhif 4 ar ganiatad rhif C24/0309/18/LL er cytuno gorffeniad allanol yr estyniad / Discharge condition no 4 on consent ref C24/0309/18/LL to agree external finish of extension

  Decided Conditions Extension

• Amgueddfa Cymru, Llanberis, LL55 4TY

  C26/0345/18/LL Submitted 9 Jun 2026 0m away

  Decision due ~4 Aug

  Gwaith ail-caddio'r lifft presennol a gwaith adfer i'r grisiau cysylltiedig a gwaith tirlunio / Re-cladding works to the existing lift and refurbishment works to the associated staircase and landscaping works

  Status unknown Full applications

• Coach House, Royal Victoria Hotel,, Llanberis, LL55 4TY

  C25/0800/15/CR Submitted 30 Oct 2025 0m away

  Tynnu grisiau presennol ac ail-osod grisiau mewnol ynghyd ag newidiadau i'r fynedfa / Remove the existing staircase and site new ones and alterations to the entrance

  Granted Heritage and listed buildings

• Welsh Slate Museum, Gilfach Ddu, Llanberis, Caernarfon, Gwynedd, LL55 4TY

  C25/0767/18/RA Submitted 20 Oct 2025 0m away

  Rhyddhau amod 5 (cyflwyno samplau morter) ar ganiatad rhif C24/0977/18/LL ac C24/0976/18/CR / Discharge condition 5 (submit mortar samples) on consent refs C24/0977/18/LL and C24/0976/18/CR

  Decided Conditions

• Plot Of Land Near The Railway, PADARN COUNTRY PARK, Llanberis, Gwynedd, LL55 4TY

  C26/0299/18/LL Submitted 15 May 2026 0m away

  Decision due ~10 Jul

  Ail-leoli mannau parcio o flaen Amgueddfa Lechi Cymru i leoedd parcio newydd yng nghornel ogledd-orllewinol maes parcio Parc Padarn yn Gilfach Ddu. Relocation of parking from in front of the National Slate Museum to new parking bays in the northwest corner of the Parc Padarn car park at Gilfach Ddu.

  Status unknown Full applications

• First Hydro Co, DINORWIG POWER STATION, Llanberis, Caernarfon, Gwynedd, LL55 4TY

  C25/0659/18/LL Submitted 15 Sep 2025 0m away

  Estyniad i'r Porthdy Diogelwch presennol Extension to existing Security Gatehouse

  Granted Full applications Extension

• C26/0349/03/AC Status unknown

  1, CASTELL BARLWYD Glanypwll Road, Tanygrisiau, Blaenau Ffestiniog, Gwynedd, LL41 3RH

  Cais i ddiwygio amod 2(cynlluniau cymeradwy) i newid dyluniad yr estyniad o ganiatad (C13/0879/03/LL) / Application to amend condition 2 (approved plans) to alter the design of the extension on planning permission (C13/0879/03/LL)

  9 Jun 2026 Amendments
• C26/0337/39/DA Status unknown

  LEE BANK Lon Rhoslyn, Abersoch, Pwllheli, Pwllheli, LL53 7BB

  Diwygiad ansylweddol i ganiatâd cynllunio C21/0086/39/DT i leihau maint y tŷ cychod, ail leoli drws y garej a newid strwythur y to o fflat i to brig. Non-material amendment to planning permission C21/0086/39/DT to reduce the size of the original boathouse, reposition of the garage door and change roof structure from flat to pitched.

  2 Jun 2026 Amendments
• C26/0311/13/DA Status unknown

  5 & 6 Llys Victoria, Stryd Fawr, Bethesda, Bangor, LL57 3AN

  Diwygiad ansylweddol i gais cynllunio C25/0422/13/LL er mwyn diwygio dyluniad y ffenestr gromen i gynnwys 2 ffenestr (3 yn flaenorol) Non-material amendment to planning application to amend the design of the dormer window to include 2 windows (formerly 3).

  20 May 2026 Amendments
• C26/0307/42/DA Status unknown

  Tir Maes Twnti, Morfa Nefyn, Pwllheli, LL53 6EU

  Cais am ddiwygiadau di-faterol i ganiatâd cynllunio C24/0689/42/LL er mwyn newid lefelau lloriau gorffenedig y lleiniau er mwyn sicrhau cydymffurfiaeth gydag Dogfen M a draenio gydag man diweddariadau cydlyniad i'r gosodiad. Application for non-material amendments to planning approval C24/0689/42/LL for changing the finished floor levels of the plots to ensure compliance with Doc M and drainage, alongside minor coordination updates to the layout

  18 May 2026 Amendments
• C26/0302/09/DA Granted

  Land Adjacent To Bryn Garreg Lwyd, Tywyn, LL36 9HE

  Cais am ddiwygiadau di-faterol i ganiatad cynllunio PIAW5/79/134 er mwyn gwneud man newidiadau i ddyluniadau’r tai a man newid i osodiad / Application for non-material amendments to planning approval PIAW5/79/134 in order to make minor changes to house designs and minor change to layout

  15 May 2026 Amendments