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

1. 15 Sep 2025

   Received by Gwynedd

2. 6 Aug 2026

   Added to PlanIndex

Permission has been granted, usually subject to conditions listed on the decision notice, some of which must be discharged before work starts. The decision notice on the council portal sets out exactly what was approved.

Work must normally begin within five years of the decision or the permission lapses. Neighbours cannot appeal a grant; challenging one means judicial review of how the decision was made, within tight time limits.

A full application seeks permission for a complete, detailed proposal in one go: siting, design, access and landscaping are all fixed at this stage. It is the standard route for new buildings, conversions and changes of use. The statutory target is eight weeks for smaller schemes and thirteen weeks for major development, though complex cases often take longer by agreement.

More on full applications 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

• 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

• C26/0392/09/LL Status unknown

  THE VICTORIA-N-SLIPWAY Marine Parade, Tywyn, Gwynedd, LL36 0DG

  Estyniad i Dŷ Tafarn ynghyd â gwaith allanol cysylltiedig / Extension to Public House and associated external works

  30 Jun 2026 Full applications
• C26/0380/18/LL Status unknown

  FFERM TAN Y DDERWEN, Llanddeiniolen, Caernarfon, Gwynedd, LL55 3AP

  Codi sied amaethyddol ar gyfer storio offer a pheiriannau Erection of an agricultural shed for the storage of implements and machinery

  25 Jun 2026 Full applications
• C26/0378/09/LL Status unknown

  Land At Pendre Enterprise Park, Tywyn, LL36 9LW

  Codi ffens derfyn, giatiau, trac mynediad ac adeilad storio peiriannau, ynghyd a gosod 3 cynhwysydd llongau 40 troedfedd i bwrpas storio / Erection of perimeter fencing, gates, access track and plant storage building, and siting of 3no. 40ft shipping containers for storage.

  24 Jun 2026 Full applications
• C26/0376/45/LL Status unknown

  PLAS HELI Glan Y Don Industrial Estate, Pwllheli, Gwynedd, LL53 5YT

  Adeiladu bloc toiledau a chawodydd arfaethedig yn plas Heli / Construction of proposed toilet and shower block at Plas Heli.

  24 Jun 2026 Full applications
• C26/0372/41/LL Status unknown

  Harlech Frozen Foods, HARLECH FROZEN FOODS Dwyfor Food Park, Llanystumdwy, Criccieth, Gwynedd, LL52 0LJ

  Codi adeilad storio dros dro i ddarparu ar gyfer cynnydd dros dro yn y galw am gynhyrchion. / Erection of a temporary storage building to accommodate a temporary increase in demand for products.

  22 Jun 2026 Full applications