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

This site has had 5 applications since 2025: 3 approved, 0 refused.

• C26/0303/18/AC Status unknown

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

  Diwygio amod rhif 2 (unol a'r cynlluniau) ar caniatad C24/0977/18/LL i godi uchder to y caffi, gwaith tirlunio a materion draenio / Amend condition number 2 (as per plans) on consent C24/0977/18/LL to increase roof height of cafe, landscaping and drainage matters

  Submitted 18 May 2026 Amendments
• C26/0139/18/LL Status unknown

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

  Gosod isbwerdy drydan a chyfansoddyn storio sgip gwastraff ynghyd â’r gwaith cysylltiedig / Installation of an electric sub-station and waste skip store compound and associated works

  Submitted 2 Mar 2026 Full applications
• C25/0937/18/CR Granted

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

  Addasiadau i rhan G38 (gweithdy haearn), G39 (gweithdy cyffredinol) a F01 (gofod arddangosfa) o'r Amgueddfa / Alterations to Metal Workshop (G38), General Workshop (G39) and Temporary Exhibition Space (F01)

  Submitted 18 Dec 2025 Heritage and listed buildings
• C25/0897/18/AC Granted

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

  Diwygio amod rhif 2 (unol a'r cynlluniau) o gais rhif C24/0976/18/CR i ddiwygio'r dyluniad mewn lleoliadau/ Amend condition 2 (as per plans) on consent no C24/0976/18/CR to vary design in places

  Submitted 2 Dec 2025 Amendments

1. 20 Oct 2025

   Received by Gwynedd

2. 6 Aug 2026

   Added to PlanIndex

Gwynedd granted permission, 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.

This application deals with conditions on an existing permission, supplying the details a condition requires or asking to vary or remove one, without reopening the permission itself. More in our guide to planning application types.

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

  C26/0062/18/RA Submitted 2 Feb 2026 50 yards 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

  Granted Conditions Extension

• Amgueddfa Cymru, Llanberis, LL55 4TY

  C26/0345/18/LL Submitted 9 Jun 2026 50 yards 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 50 yards 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

  C26/0303/18/AC Submitted 18 May 2026 50 yards away

  Decision due ~13 Jul

  Diwygio amod rhif 2 (unol a'r cynlluniau) ar caniatad C24/0977/18/LL i godi uchder to y caffi, gwaith tirlunio a materion draenio / Amend condition number 2 (as per plans) on consent C24/0977/18/LL to increase roof height of cafe, landscaping and drainage matters

  Status unknown Amendments

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

  C26/0299/18/LL Submitted 15 May 2026 50 yards 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 50 yards away

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

  Granted Full applications Extension

• C26/0385/09/RA Status unknown

  TREFRI Brynhyfryd Road, Tywyn, Gwynedd, LL36 9HG

  Cais i rhyddhau Amod 6(Cynllun Tirlunio a phlannu coed) o ganiatad cynllunio C24/1027/09/LL / Application to release Condition 6 (Landscaping and tree planting scheme) from planning permission C24/1027/09/LL

  Received 27 Jun, published by the council 6 Aug 2026 Conditions
• C26/0379/39/RA Status unknown

  FFERM SARN Lôn Sarn Bach, Sarn Bach, Pwllheli, Gwynedd, LL53 7BG

  Cais i rhyddhau amodau (2), (3) a (4) o ganiatad cynllunio C25/0777/39/LL yn ymwneud a (2) ( (Arolwg ffotograffig) (3) lliw llechi (4) gorffeniad allanol. Application to discharge conditons (2), (3) and (4) of planning permission C25/0777/39/LL in relation to (2) photographic survey (3) colour of slate (4) external finishes.

  Received 25 Jun, published by the council 6 Aug 2026 Conditions
• C26/0375/30/RA Status unknown

  Tir Ger / Land By Horeb, Lon Uwchmynydd, Aberdaron, Pwllheli, LL53 8BY

  Cais i rhyddhau amodau ar ganiatâd cynllunio - C24/0840/30/LL, yn benodol amod (3) yn ymwneud a darparu manylion goleuo. Application to discharge conditions on planning approval- C24/0840/30/LL , namely condition (3) - in relation to submitting lighting details.

  Received 24 Jun, published by the council 6 Aug 2026 Conditions
• C26/0374/42/RA Status unknown

  Tŷ Gwyn, 2, CLIFF BUNGALOWS Y Lôn Gam, Nefyn, Pwllheli, Gwynedd, LL53 6ED

  Cais ar gyfer rhyddhau amodau ( 3) a (7) o ganiatâd cynllunio C25/0398/42/LL sy'n ymwneud a (3) Gorffeniadau Allanol a (7) cyflwyno Cynllun Rheoli Adeiladu . Application to discharge conditions (3) and (7) of planning permission C25/0398/42/LL in relation to (3) External Finishes and (7) the submission of a Construction Management Plan

  Received 23 Jun, published by the council 6 Aug 2026 Conditions
• C26/0363/35/RA Status unknown

  SIBRWD Y GWYNT Morannedd, Criccieth, Gwynedd, LL52 0PP

  Cais i rhyddhau amod 6(manylion dwr budur) o ganiatad cynllunio C20/0040/35/LL / Application to discharge condition 6(foul drainage details) o gais cynllunio C20/0040/35/LL

  Received 18 Jun, published by the council 6 Aug 2026 Conditions