Planning applications in Gwynedd, December 2025

20 Nant Y Glyn, Llanrug, Caernarfon, Gwynedd, LL55 4AH

Codi estyniad un llawr ar gefn y eiddo, ynghyd ag estyniad llawr cyntaf dros y gegin/ystafell fwyta bresennol i ffurfio ystafell wely Erection of single storey extension to the rear of the property, together with a first floor extension over existing kitchen/dining to form bedroom

Land Along The A483 Corridor, Porthmadog

Estyniad i gompownd ceblau selio pen presennol Wern gan gynnwys mynediad parhaol newydd, Compownd selio pen newydd ac adeilad pen twnnel gyda mynediad parhaol ym Minffordd; tynnu compownd selio pen presennol Garth; gosod ceblau 400 cilofolt (kV) newydd i ddisodli ceblau 400 kV a 132 kV di-angen; ac isadeiledd a gwaith atodol cysylltiedig. The extension of the existing Wern Cables Sealing End Compound (CSEC) including a new permanent access; a new Minffordd CSEC and Tunnel Head House (THH) with permanent access; the removal of the existing Garth CSEC; installation of new 400 kilovolt (kV) cables to replace redundant 400 kV and 132 kV cables; and other associated infrastructure and ancillary works.

VENUE Station Square, Pwllheli, Gwynedd, LL53 5HG

Gosod arwyddion ffasgia newydd a byrddu bwydlen / Installation of New fascia signage and menu boards

Land South Of A487, Glan Dwyfach, Garndolbenmaen, LL51 9PQ

Cais ar gyfer darparu is-orsaf newydd ynghyd a seilwaith a gwaith cysylltiol i gynnwys ffordd mynediad newydd o'r A487 ac uwchraddio ffordd mynediad amaethyddol a gosod ceblau tanddaearol 132 kV newydd er mwyn cysylltu gyda'r llinnell Rhwydwaith Trydan presennol uwchben. Application for a new substation and associated infrastructure and ancillary works, including a new access road from the A487 and the upgrading of an existing agricultural access track, and new underground 132 kV cables to connect to the existing Electricity Networks overhead line.

Pentir Substation, Bangor, LL57 4ED

Amnewid ceblau tanddaearol presennol a gosod ceblau tanddaearol traws-safle newydd yn is-orsaf presennol Pentir yn ogystal a gwaith cysylltiol. Replacement of existing underground cables and installation of new cross site underground cables in the existing Pentir substation and ancillary works

Glanfa Lôn Tyn Y Mur, Morfa Nefyn, Pwllheli, Gwynedd, LL53 6AY

Cais amlinellol gyda'r holl faterion wedi eu cadw yn ol i godi ty preswyl deulawr ar rhan segur o lain dwbl gwreiddiol / Outline application with all matters reserved for the erection of a 2 storey dwelling on vacant half of original double plot

Santander, Santander, 1 - 3 Bridge Street, Caernarfon, Gwynedd, LL55 1AB

Bwriedir newid defnydd cyn fanc Santander i gynnwys Bar/Tafarn (Dosbarth Defnydd A3) ar y Llawr Isaf, Bwyty (Dosbarth Defnydd A3)(i gynnwys gosod ffliw allanol) ar y Llawr Gwaelod ac ystafelloedd gwely ar llawr cyntaf. Proposed change of use of former Santander Bank to comprise of Bar / Pub (Use Class A3) on Lower Ground Floor, Restaurant (Use Class Class A3) (to include installation of external flue) on Ground Floor and bedrooms on first floor.

VENUE Station Square, Pwllheli, Gwynedd, LL53 5HG

Cais cynllunio i osod peiriannau ac offer echdynnu a man newidiadau i'r tu allan / Application for planning consent for the installation of plant and extract equipment plus minor external alterations

TŶ CIPAR, Cwmtirmynach, Y Bala, Gwynedd, LL23 7EB

Cais i godi estyniad deulawr ynghyd a man newidiadau mewnol yn dilyn dymchwel yr ystafell haul bresennol / The proposal includes the erection of a two-storey extension, together with other minor internal alterations, following the demolition of the existing conservatory.

Bakhita, Bethel, Caernarfon, Gwynedd, LL55 1YB

Cais i ryddhau amod 12 (cynllun gwaredu dŵr budr a dŵr wyneb) o ganiatâd C19/0415/18/LL ar gyfer codi un tŷ deulawr a datblygiadau cysylltiol, a ddiwygiwyd gan ganiatâd C24/0467/18/AC. Application to discharge condition 12 (foul and surface water disposal scheme) of permission C19/0415/18/LL for the erection of one two‑storey dwelling and associated developments, as amended by permission C24/0467/18/AC.

TŶ NEWYDD, Mynytho, Pwllheli, Gwynedd, LL53 7RR

Estyniad ac addasiadau, gan gynnwys balconi. / Extension and alterations, including a balcony.

Allt Wen, FFRWD CAE DU, Bontnewydd, Caernarfon, Gwynedd, LL54 7YG

Dymchwel y modurdy a'r storfa allanol bresennol, a chodi estyniadau unllawr a deulawr newydd yn eu lle, ynghyd â newidiadau cysylltiedig. Demolition of existing garage and external store, erection of new single-storey and two-storey extensions in lieu, along with associated alterations.

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)

Land At Hendre, Boduan, LL53 8TY

Cais llawn i gynnal gwaith cloddio er mwyn creu lagŵn slyri / Full application for excavation works to create a slurry lagoon.

Land At And Adjacent To The Former Ferodo Site, Griffiths Crossing, Caernarfon, LL55 1TP

Cais am farn gwmpasu o dan Reol 14, Rhan 4 o Reoliadau Cynllunio Gwlad a Thref [Asesiad Effaith Amgylcheddol] [Cymru] 2017 – dymchwel adeiladau a strwythurau presennol, ailraddio'r tir a codi adeilad canolfan data (B8) ynghyd a chyfarpar cysylltiol i gynnwys generaduron, peirianwaith, cyfarpar, is-orsaf(oedd), mynedfeydd, parcio ac ardaloedd gwasanaethu, gwaith draenio a peirianyddol gan gynnwys cysylltu ac ail-leoli gwasanaethau / Request for a scoping opinion under Regulation 14, Part 4 of the Town and Country Planning [Environmental Impact Assessment] [Wales] Regulations 2017 - demolition of existing buildings/structures, re-grading of land and erection of Class B8 data centre building(s) with all associated back-up generators, plant, equipment, sub-station(s), accesses, parking and servicing areas, drainage and engineering works, including services diversion/connection.

Y Wenallt High Street, Abersoch, Pwllheli, Gwynedd, LL53 7DR

Cais llawn i newid defnydd rhan o dy preswyl presennol ar gyfer ymestyn ardal siop / Full application to change a section of an existing residential property in order to extend a shop area

Grisiau Mawr, Pencei, , Porthmadog, LL49 9AT

Gosod canllaw yng nghanol y grisiau / Erect railing in middle of stairs

HAFANNEDD Summerhill Terrace, Blaenau Ffestiniog, Gwynedd, LL41 3EQ

Estyniad deulawr cefn. Two-storey rear extension.

Land Adjacent To 10 Warden Street, Llanberis, LL55 4HP

Codi annedd newydd Erection of new dwelling

Britannia House, Bontnewydd, Caernarfon, Gwynedd, LL54 7UN

Gosod paneli solar Install solar panels

Llys Derwen Camping & Caravan Site, Caravan Park, Llys Derwen Ffordd Minffordd, Llanrug, Caernarfon, Gwynedd, LL55 4RD

Newid defnydd rhan o adeilad allanol presennol i fewn i gyfleuster gofal dydd i gwn, yn gysylltiedig gyda'r maes carafanau teithiol a maes gwersylla Change of use of part of existing outbuilding into a dog daycare facility in conjunction with existing touring caravan and campsite

1 Fron Deg Terrace, Llanberis, Caernarfon, Gwynedd, LL55 4HR

Codi annedd deuluol. Erection of family dwelling.

Cae Newydd, Pencaenewydd, Pwllheli, Gwynedd, LL53 6RD

Cais i greu storfa slyri newydd(cynllun diwygiedig i'r hyn ganiatawyd dan gais C21/0804/41/LL / Application to construct a new slurry store (amendment to application granted under reference number C21/0804/41/LL)

St Joseph Eleanor Street, Caernarfon, Gwynedd, LL55 1PG

Newid defnydd o annedd i tri fflat hunangynhaliol (C3), a newid defnydd capel a festri i annedd (C3). Change of use from a single dwelling to three self-contained flats (C3) and change of use from a chappel and vestry to single dwelling (C3).

TRE WEN, Botwnnog, Pwllheli, Gwynedd, LL53 7SP

Adeiladu to dros iard bresennol Construction of roof over existing yard

Tyn Y Weirglodd, Rhosgadfan, Caernarfon, Gwynedd, LL54 7ET

Dymchwel modurdy presennol gan adeiladau estyniad cefn ac ochr newydd ynghyd a modurdy newydd. Demolish existing garage to build rear and side extension in addition to a new garage.

Land Adjacent Ty'n Llannor Fawr, Rhosfawr, LL53 6YF

Cais llawn i greu storfa slyri newydd / Full application to create a new slurry ground slurry store

Braich Goch Hotel, Corris, Machynlleth, Gwynedd, SY20 9RD

Cais i rhyddhau amod 3, 4 a 5 oddi ar caniatad cynllunio C25/0436/02/LL / Application to remove condition 3, 4 and 5 from planning consent C25/0436/02/LL

Hen Felin Ffordd Treborth, Treborth, Bangor, Gwynedd, LL57 2RQ

Codi llwybr pren a mannau decin o fewn y coetir, ynghyd â chodi adeilad storfa bren (gyda phaneli solar PV ar y to) a ffordd fynediad, yn ogystal â chodi triniaethau ffin derfyn o amgylch perimedr y tirddaliad coetir ehangach. Erection of boardwalk and decking areas within woodland, erection of woodstore building (with Solar PV on roof) and access road together with erection of boundary treatments around the perimeter of the wider woodland landholding.

21 Penlan Street, Pwllheli, Gwynedd, LL53 5DE

Cais arfaethedig i newid defnydd presennol siop / galeri arlunio (A1) caffi (A3) a gweithdy (B1) i gaffi (A3) stiwdio (D2) a man hyblyg cynnal digwyddiadau (defnydd unigryw) ynghyd a chodi storfa finiau tu allan. Ni fydd dim newid i’r fflatiau ar y llawr cyntaf. Bydd y stiwdio / man hyblyg cynnal digwyddiadau yn cael ei ddefnyddio i gynnal dosbarthiadau ffitrwydd, sesiynau creadigol, cynulliadau cymunedol a digwyddiadau bach / Proposed change of use of existing shop / art gallery (A1), cafe (A3) and workshop (B1) into a cafe (A3) studio (D2), and flexible event space (Sui Generis). Along with the erection of an external bin store. The existing 1st floor flats are to remain unchanged. The studios / flexible event space will be used to host fitness classes, creative sessions, community gatherings and small events,

Boathouse Corn Hill, Porthmadog, Gwynedd, LL49 9AY

Cais am dystysgrif cyfreithlon arfaethedig i barhau i ddefnyddio’r rhan preswyl yr eiddo o fewn defnydd C6 o’r Gorchymyn Cynllunio Gwlad a Thref(Dosbarth Defnydd) 1987(fel y’i diwygiwyd) yn groes i’r caniatâd gwreiddiol a ganiatawyd(CO5D/0290/44/LL a CO7D/0163/44/LL) sydd ac Amod 106 yn datgan bod rhaid i’r elfen preswyl o’r eiddo gael ei feddiannu gan rheolwr llawn amser neu perchennog y iard gychau Application for a Lawful development certificate to continue to use the residential element of the property within use class C6 of the Town and Country Planning (Use Class) Order 1987 (as amended) in breach of the original planning consent(CO5D/0290/44/LL and CO7D/0163/44/LL) which has a Section 106 which states the residential element of the property must be occupied only by a person employed full-time as the manager and/or owner acting as the full-time manager of the adjoining boatyard

Tir Ger / Land By Erw Wen, Lon Penrhos, Morfa Nefyn, Pwllheli, LL53 6BL

Cais amlinellol gyda rhai materion wedi eu cadw yn ôl i godi un tŷ annedd / Outline application with some matters reserved to construct one residential dwelling

Land At Bronydd Isaf, Llanllechid, LL57 3LN

Codi uned storio amaethyddol Erection of agricultural storage unit

Llyn Bach, Porthmadog, LL49 9DF

Cynnig i dynnu'r wal derfyn bresennol er mwyn darparu mynediad gwell i Gob Crwn, a chreu llwybr troed newydd ar gyfer cerddwyr a beicwyr. A proposal to remove the existing boundary wall in order to provide improved access to Cob Crwn, and to create a new footpath for pedestrians and cyclists.

Cas Bach Ni, 9 Gwaun Ganol, Criccieth, Gwynedd, LL52 0TB

Dymchwel canopi blaen a'i ddisodli gyda portsh caeedig gyda theras uwchben a chysgodfan haul ychwanegol ar gyfer y ffenestri Demolition of a front canopy and replacement with an enclosed porch with terrace above and additional solar shading to windows

Y FELIN WEN, Pontrug, Gwynedd, LL55 2BB

Diwygiad ansylweddol i ddyluniad hawl cynllunio C04A/0830/23/LL. Non-material amendment to the design of planning permission C04A/0830/23/LL.

29 Cae Llepa, Bangor, Gwynedd, LL57 1HF

Newid defnydd ty annedd yn dy amlfeddianaeth (HMO) 3 ystafell wely ar gyfer hyd at 5 o bobl / Change of use of dwelling to 3 bed house of multiple occupancy (HMO) for up to 5 people

Plas Y Bryn Chalet Park, Bontnewydd, Caernarfon, Gwynedd, LL54 7YE

Anecs i'r prif dy Annex to the main residential dwelling.

D P Davies, D P Davies, 26 High Street, Blaenau Ffestiniog, Gwynedd, LL41 3AA

Estyniad a grisiau allanol / Extension and external staircase

Hen Felin Ffordd Treborth, Treborth, Bangor, Gwynedd, LL57 2RQ

Rhybudd ymlaen llaw o waith dymchwel. Prior notification of demolition works.

Bryn Parkia, Parkia Bangor Road, Caernarfon, Gwynedd, LL55 1TP

Codi sied yng nghwrtil yr eiddo. Erection of a shed.

Fferm Chwilog Fawr, Chwilog, Pwllheli, Gwynedd, LL53 6SW

Adeiladu sied amaethyddol ar gyfer storio porthiant anifeiliaid Construction of agricultural shed to store animal feed

Tŷ Gwyn Ffordd Morfa Bychan, Morfa Bychan, Porthmadog, Gwynedd, LL49 9UU

Newidiadau i ddyluniad y to ac i fynediad y safle. Modifications to the roof design and site access.

296 High Street, Bangor, Gwynedd, LL57 1UL

Cais am Dystysgrif Datblygiad Cyfreithlon ar gyfer Defnydd Arfaethedig i alluogi trosi gofod llawr cyntaf uwchben siop presennol (defnydd A1) yn 1 x fflat breswyl defnydd C3. Application for a Lawful Development Certificate for a Proposed Use to enable the conversion of first floor space above existing siop (A1 use) into 1 x C3 use residential flat.

TŶ MAWR WEST SLATE QUARRY, Talysarn, Gwynedd, LL54 6AY

Cais am Farn Sgrinio o dan Reoliad 6(1) o Reoliadau Cynllunio Gwlad a Thref (Asesiad Effaith Amgylcheddol) (Cymru) 2017 ar gyfer estyniad i ardal echdynnu mwynau a chydgrynhoi caniatâd mwynau presennol / Request for Screening Opinion under Regulation 6(1) of the Town and Country Planning (Environmental Impact Assessment) (Wales) Regulations 2017 for an extension to mineral extraction area and consolidation of existing mineral permissions

296 High Street, Bangor, Gwynedd, LL57 1UL

Newid defnydd eiddo i ddefnydd cymysg drwy greu fflat stiwdio hunangynhaliol ar y llawr daear yng nghefn y siop bresennol, fflat hunangynhaliol ar yr ail lawr a fflat hunangynhaliol ar y trydydd llawr (Dosbarth defnydd C3) , ynghyd ag estyniad llawr daear cefn. Change of use of the property to mixed use by creating a self-contained studio flat on the ground floor at the rear of the existing shop, a self-contained flat on the second floor and a self-contained flat on the third floor (Use Class C3), together with a rear ground floor extension.

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

Briar Bank, Llanaber, Abermaw, LL42 1YP

Tystysgrif datblygiad cyfreithlon arfaethedig i ddefnyddio’r eiddo o fewn dosbarthiadau defnydd C3, C5 neu C6 o’r Gorchymyn Cynllunio Gwlad a Thref (Dosbarth Defnydd) 1987 (fel y’i diwygiwyd) ynghyd a’r newid defnydd a ganiateir rhwng y dosbarthiadau. Lawful development certificate for the proposed use of the property within use classes C3, C5 or C6 of the Town and Country Planning (Use Class) Order 1987 along with the permitted change of use between the use classes.

Lleiniau, Llangwnnadl, Pwllheli, Gwynedd, LL53 8NY

Diwygio amod 2 (unol a'r cynlluniau) ar ganiatad Cynllunio C25/0557/32/DT er mwyn symud yr ystafell gawod Variation of condition 2 (in accordance with plans) on Planning permission C25/0557/32/DT to revise the location of the shower room.

24 Coed Y Maes, Penrhosgarnedd, Bangor, Gwynedd, LL57 2EJ

Codi annedd newydd Erection of new dwelling