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Planning application

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

Granted Gwynedd C25/0937/18/CR Listed Building Consent

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

Proposal

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)

As published by the council, reference C25/0937/18/CR

Application record

Reference
C25/0937/18/CR
Type
Listed Building Consent
Status
Conditions
Decision
Approved with Conditions
Received
18 Dec 2025
Ward
Deiniolen
Parish
Llanddeiniolen
Postcode
LL55 4TY

Site history

Applications at this address on the Gwynedd register

This site has had 5 applications since 2025: 1 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
  • C25/0897/18/AC Decided

    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
  • C25/0767/18/RA Decided

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

    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

    Submitted 20 Oct 2025 Conditions

Timeline

Dates from the published record

  1. 18 Dec 2025

    Received by Gwynedd

  2. 6 Aug 2026

    Added to PlanIndex

What this grant of permission means

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.

About heritage and listed building applications

Listed building consent is needed for works that affect the special interest of a listed building, and carrying out such works without it is a criminal offence. More in our guide to planning application types.

Nearby applications

Within 500 metres

  • 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

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

    C26/0303/18/AC Submitted 18 May 2026 0m 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 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

In Gwynedd

  • C26/0367/46/CR Decided

    TŶ MAWR, Llangwnnadl, Pwllheli, Gwynedd, LL53 8NU

    Codi estyniad unllawr ar ochr ty annedd, trosi adeilad allanol sydd ynghlwm i ffurfio rhan o'r eiddo a gwaith adfer i adeilad allanol arwahan / Erection of a single storey extension to the side of dwelling house, conversion of attached outbuilding to form part of dwelling and works to repair a separate outbuilding.

    19 Jun 2026 Heritage and listed buildings
  • C26/0272/11/CR Status unknown

    Shoe Zone, 256 High Street, Bangor, Gwynedd, LL57 1PA

    Addasiadau mewnol i drosi rhan o'r llawr daear a'r lloriau uchod yn 6 uned byw a gosod blaen siop newydd / Internal alterations to convert part of ground floor and upper floors into 6 units and new shopfront

    4 May 2026 Heritage and listed buildings
  • C26/0257/13/CR Status unknown

    VICTORIA HOTEL High Street, Bethesda, Bangor, Gwynedd, LL57 3AN

    Addasiadau mewnol er creu baddonau "en suite" ar y llawr cyntaf ac ail, gosod gwydriad eilradd ac amnewid y ffenestri to presennol am rhai maint mwy / Internal alterations to create en-suite facilities on first and second floor, install secondary glazing and replace existing rooflights with larger ones

    23 Apr 2026 Heritage and listed buildings
  • C26/0227/41/CR Status unknown

    THE FEATHERS INN, Llanystumdwy, Criccieth, Gwynedd, LL52 0SH

    Newidiadau i’r cais a ganiatawyd o dan cyfeirnod C22/0028/41/CR i gynnwys newid maint a nifer ffenestri, ymestyn rhan o’r estyniad i greu toiled hygyrch ac ymestyn y teras ar pen yr estyniad, gosod paneli solar, ail-lleoli’r mynediad i’r fflat a gosod ffliw newydd / Changes to the approved application under reference C22/0028/41/CR to include changes to the number and size of windows, enlarge size of extension to create an accessible toilet and increase the terrace on the end of the extension, site solar panels, re-locate the entrance to the flat and install new flue

    9 Apr 2026 Heritage and listed buildings
  • C26/0193/45/CR Status unknown

    Iard Y Tower Hotel Stryd Y Llan, , Pwllheli, LL53 5RR

    Trosi ac adfer yr adeiladau allanol yn ddefnydd cymysgo o unedau storio, busnes ac uned byncws gyda addasaidau mewnol ac allanol i'r adeiladau / Convert and restore the outbuildings into a mixed use of storage units, business and bunkhouse unit with internal and external alterations to the buildings

    26 Mar 2026 Heritage and listed buildings