# Grade I listed buildings in Gwynedd

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In the United Kingdom, the term listed building refers to a building or other structure officially designated as being of special architectural, historical, or cultural significance; Grade I structures are those considered to be "buildings of exceptional interest". Listing was begun by a provision in the Town and Country Planning Act 1947. Once listed, strict limitations are imposed on the modifications allowed to a building's structure or fittings. In Wales, the authority for listing under the Planning (Listed Buildings and Conservation Areas) Act 1990 rests with Cadw.

## Buildings

| Name | Location Grid Ref. Geo-coordinates | Date Listed | Function | Notes | Reference Number | Image |
| Cochwillan | Llanllechid SH6069569416 53°12′13″N 4°05′14″W﻿ / ﻿53.20351985981°N 4.0871098688374°W﻿ / 53.20351985981; -4.0871098688374﻿ (Cochwillan) | 22 February 1952 | House | Situated in low-lying pasture fields at end of short track off the minor road between Bethesda and Tal-y-bont. | 3653 | See more images |
| Penrhyn Castle | Llandygai SH6026671918 53°13′33″N 4°05′41″W﻿ / ﻿53.225882014953°N 4.0946246710567°W﻿ / 53.225882014953; -4.0946246710567﻿ (Penrhyn Castle) | 3 March 1966 | Castle | Set in landscaped grounds of Penrhyn Park in elevated position surrounded by open lawns and some trees at end of long winding drive from Grand Lodge. | 3659 | See more images |
| Glynllifon | Llandwrog SH4566255388 53°04′24″N 4°18′19″W﻿ / ﻿53.073364652311°N 4.3052317370628°W﻿ / 53.073364652311; -4.3052317370628﻿ (Glynllifon) | 29 April 1952 | House | Set in its own extensive grounds on east side of the A499 at Llandwrog; the house is reached by a short drive from the grand lodge. Built on a platform site. | 3684 | See more images |
| St Beuno's Church | Clynnog SH4145149698 53°01′16″N 4°21′55″W﻿ / ﻿53.021024169482°N 4.3652295791478°W﻿ / 53.021024169482; -4.3652295791478﻿ (St Beuno's Church) | 29 May 1968 | Church | The church is set close to the main Caernarfon to Pwllheli road, in a large graveyard which slopes gently to the N. The chapel stands on the S side of the tower. | 3758 | See more images |
| Fort Belan | Llandwrog SH4403660941 53°07′22″N 4°19′56″W﻿ / ﻿53.122765717568°N 4.3321782202911°W﻿ / 53.122765717568; -4.3321782202911﻿ (Fort Belan) | 29 May 1968 | Fort | Situated 4km south-west of Caernarfon reached along a track to the head of the short peninsula north of Dinas and Morfa Dinlle with dock immediately to east. | 3810 | See more images |
| Caernarfon Castle | Caernarfon SH4779662683 53°08′22″N 4°16′37″W﻿ / ﻿53.139501325294°N 4.2768654827618°W﻿ / 53.139501325294; -4.2768654827618﻿ (Caernarfon Castle) | 31 March 1983 | Castle | At the S end of the town and on the N bank of the Afon Seiont. | 3814 | See more images |
| Caernarfon town walls | Caernarfon SH4793162532 53°08′17″N 4°16′29″W﻿ / ﻿53.138183703447°N 4.2747773214531°W﻿ / 53.138183703447; -4.2747773214531﻿ (Caernarfon town walls) | 31 March 1983 | Town walls | Enclosing the old town on the N side of Caernarfon Castle. | 3815 | See more images |
| Police Station | Caernarfon SH4770862695 53°08′23″N 4°16′41″W﻿ / ﻿53.139583903935°N 4.2781856257604°W﻿ / 53.139583903935; -4.2781856257604﻿ (Police Station) | 8 October 1953 | Police station | At the W end of Castle Ditch abutting the Town Wall and directly opposite Caernarfon Castle. | 3827 | See more images |
| County Court (former County Hall) | Caernarfon SH4773162704 53°08′23″N 4°16′40″W﻿ / ﻿53.139671328905°N 4.277846357847°W﻿ / 53.139671328905; -4.277846357847﻿ (County Court (former County Hall)) | 8 October 1953 | Courthouse | At the junction of Castle Ditch and Shirehall Street, directly opposite Caernarfon Castle. | 3828 | See more images |
| St Mary's Church | Caernarfon SH4775562948 53°08′31″N 4°16′39″W﻿ / ﻿53.141869766317°N 4.2776038664807°W﻿ / 53.141869766317; -4.2776038664807﻿ (St Mary's Church) | 8 October 1953 | Church | At the N end of the street and incorporated into the Town Wall. | 3857 | See more images |
| Porth yr Aur (Royal Welsh Yacht Club) | Caernarfon SH4771162817 53°08′26″N 4°16′42″W﻿ / ﻿53.140680544705°N 4.2781988263476°W﻿ / 53.140680544705; -4.2781988263476﻿ (Porth yr Aur (Royal Welsh Yacht Club)) | 10 August 1953 | Yacht club | At the W end of High Street and facing The Promenade. | 3861 | See more images |
| St Peblig's Church | Caernarfon SH4875062290 53°08′10″N 4°15′45″W﻿ / ﻿53.136243721508°N 4.2624300891199°W﻿ / 53.136243721508; -4.2624300891199﻿ (St Peblig's Church) | 10 August 1953 | Church | In a walled churchyard set back from the road and to the S of Segontium Roman Fort. | 3881 | See more images |
| University College of North Wales (original building) | Bangor SH5794072337 53°13′44″N 4°07′47″W﻿ / ﻿53.229027412542°N 4.1296279532774°W﻿ / 53.229027412542; -4.1296279532774﻿ (University College of North Wales (original building)) | 27 May 1949 | University | Built 1907–11 by Henry T Hare and described by Cadw as architecturally one of the most significant public buildings of the period in Britain. | 3963 | See more images |
| Bangor Cathedral | Bangor SH5807872059 53°13′36″N 4°07′39″W﻿ / ﻿53.226567225131°N 4.127438326451°W﻿ / 53.226567225131; -4.127438326451﻿ (Bangor Cathedral) | 27 May 1949 | Cathedral | In a sloping oval churchyard below the street. | 4027 | See more images |
| Menai Suspension Bridge | Bangor SH5561971510 53°13′15″N 4°09′50″W﻿ / ﻿53.220971737717°N 4.1639965901374°W﻿ / 53.220971737717; -4.1639965901374﻿ (Menai Suspension Bridge) | 2 August 1988 | Bridge | Spanning the Menai Straits to W of the city. | 4049 | See more images |
| Vaynol Old Hall | Pentir SH5382969536 53°12′10″N 4°11′24″W﻿ / ﻿53.202750224581°N 4.1898810035128°W﻿ / 53.202750224581; -4.1898810035128﻿ (Vaynol Old Hall) | 22 February 1952 | Craft centre | Set in the heart of Vaynol Park, E of Vaynol Hall. Attached outbuildings on the W end, some facing the stable yard. | 4166 | See more images |
| Vaynol Chapel | Pentir SH5382169561 53°12′11″N 4°11′24″W﻿ / ﻿53.202972576487°N 4.1900121346178°W﻿ / 53.202972576487; -4.1900121346178﻿ (Vaynol Chapel) | 22 February 1952 | Chapel | The building is located immediately N of the Old Hall, on a raised terrace in the SW corner of the Terraced Gardens. | 4172 | See more images |
| Vaynol Hall | Pentir SH5369669434 53°12′06″N 4°11′31″W﻿ / ﻿53.201797367641°N 4.1918238666841°W﻿ / 53.201797367641; -4.1918238666841﻿ (Vaynol Hall) | 22 February 1952 | Country house | Located at the centre of Vaynol Park, SW of the Old Hall, and having gardens adjoining to the SW. | 4173 | See more images |
| St Hywyn's Church | Aberdaron SH1732526367 52°48′14″N 4°42′41″W﻿ / ﻿52.803820000617°N 4.7113810560122°W﻿ / 52.803820000617; -4.7113810560122﻿ (St Hywyn's Church) | 19 October 1971 | Church | Situated in Aberdaron village, the graveyard running to the cliff edge. | 4225 | See more images |
| St Mary's Abbey ruins | Bardsey Island, Aberdaron SH1200822172 52°45′52″N 4°47′16″W﻿ / ﻿52.764321387251°N 4.7877465961611°W﻿ / 52.764321387251; -4.7877465961611﻿ (St Mary's Abbey ruins) | 19 October 1971 | Abbey (ruined) | Situated towards the N end of the island in walled churchyard. | 4232 | See more images |
| St Iestyn's Church | Llaniestyn, Tudweiliog SH2697333766 52°52′24″N 4°34′20″W﻿ / ﻿52.873456175113°N 4.5723429593327°W﻿ / 52.873456175113; -4.5723429593327﻿ (St Iestyn's Church) | 19 October 1971 | Church | Situated on the S side of the village centre at Llaniestyn. | 4258 | See more images |
| Capel Newydd | Nanhoron, Llanengan SH2858130919 52°50′54″N 4°32′49″W﻿ / ﻿52.848405015008°N 4.5469780820796°W﻿ / 52.848405015008; -4.5469780820796﻿ (Capel Newydd) | 19 October 1971 | Chapel | Situated in field near Ty Bricks reached by lane and track running W from B4413 from point some 700m E of Nanhoron. | 4303 | See more images |
| St Engan's Church | Llanengan SH2939627031 52°48′49″N 4°31′58″W﻿ / ﻿52.813748014389°N 4.5328552855759°W﻿ / 52.813748014389; -4.5328552855759﻿ (St Engan's Church) | 19 October 1971 | Church | Situated in Llanengan village in large churchyard just W of road to Llangian. | 4304 | See more images |
| St Cawrdaf's Church | Abererch, Llannor SH3966136582 52°54′10″N 4°23′07″W﻿ / ﻿52.902689784226°N 4.3853943819615°W﻿ / 52.902689784226; -4.3853943819615﻿ (St Cawrdaf's Church) | 19 October 1971 | Church | The parish church stands in the large churchyard well furnished with slate tombstones, including some C18 ledger stones at the E, at the W end of Abererch village. | 4317 | See more images |
| Ffynnon Cybi | Llanystumdwy SH4272241276 52°56′45″N 4°20′32″W﻿ / ﻿52.945756852863°N 4.3422005276714°W﻿ / 52.945756852863; -4.3422005276714﻿ (Ffynnon Cybi) | 19 October 1971 | Well | The well lies in the narrow valley below the slopes of Garn Bentyrch, and is reached by a footpath from the NE corner of the churchyard, crossing two fields, the second by a causeway. | 4343 | See more images |
| Penarth Fawr | Llanystumdwy SH4192737675 52°54′47″N 4°21′08″W﻿ / ﻿52.913179726817°N 4.352266415218°W﻿ / 52.913179726817; -4.352266415218﻿ (Penarth Fawr) | 19 October 1971 | | The house stands on a minor road running N from the A497, W of Pwllheli towards Llanarmon. | 4359 | See more images |
| St Beuno's Church | Pistyll SH3283342320 52°57′08″N 4°29′23″W﻿ / ﻿52.952135634637°N 4.4897687394816°W﻿ / 52.952135634637; -4.4897687394816﻿ (St Beuno's Church) | 19 October 1971 | Church | The church is set on a sloping site in a narrow valley below the later hamlet of Pistyll, and below the former road line of the Llithfaen to Nefyn road. | 4374 | See more images |
| St Gwynhoydl's Church | Llangwnnadl SH2088533236 52°52′00″N 4°39′45″W﻿ / ﻿52.866698958961°N 4.6624041341316°W﻿ / 52.866698958961; -4.6624041341316﻿ (St Gwynhoydl's Church) | 19 October 1971 | Church | Situated some 500m E of the crossroads at Pen-y-graig, NE of a minor road from the crossroads to Pont Llangwnnadl. | 4378 | See more images |
| Criccieth Castle | Criccieth SH4998837731 52°54′58″N 4°13′57″W﻿ / ﻿52.915999752114°N 4.232513451147°W﻿ / 52.915999752114; -4.232513451147﻿ (Criccieth Castle) | 2 August 1949 | Castle | Founded as a royal residence by the princes of Gwynedd. Taken by Edward I in 1283 and slighted by Owain Glyndŵr in 1403. | 4396 | See more images |
| Capel Peniel | Porthmadog SH5625939895 52°56′14″N 4°08′25″W﻿ / ﻿52.937157505536°N 4.1402792294475°W﻿ / 52.937157505536; -4.1402792294475﻿ (Capel Peniel) | 30 March 1951 | Chapel | Set back from the road at the S end of Tremadog. | 4442 | See more images |
| St Cadfan's Church | Tywyn SH5882200952 52°35′17″N 4°05′07″W﻿ / ﻿52.587994925004°N 4.0853823049827°W﻿ / 52.587994925004; -4.0853823049827﻿ (St Cadfan's Church) | 30 March 1951 | Church | Near the E end of the modern town, in a walled churchyard on the W side of Corbet Square. | 4642 | See more images |
| St Derfel's Church | Llandderfel SH9815737066 52°55′17″N 3°30′58″W﻿ / ﻿52.921341072859°N 3.516246803933°W﻿ / 52.921341072859; -3.516246803933﻿ (St Derfel's Church) | 20 October 1966 | Church | Located within its own walled churchyard at the SW edge of the village, with commanding views down the Dee valley. | 4654 | See more images |
| St Mary and St Egryn's Church | Llanegryn SH5961805787 52°37′54″N 4°04′33″W﻿ / ﻿52.631638395768°N 4.0756948300497°W﻿ / 52.631638395768; -4.0756948300497﻿ (St Mary and St Egryn's Church) | 17 June 1966 | Church | The church is located on a S facing bluff above the confluence of two streams, NNW of the present nucleated village, and is reached by a minor road off the N end of the main village street. | 4729 | See more images |
| Cymer Abbey | Llanelltyd SH7213419517 52°45′29″N 3°53′46″W﻿ / ﻿52.75809802391°N 3.8962164165481°W﻿ / 52.75809802391; -3.8962164165481﻿ (Cymer Abbey) | 17 June 1966 | Abbey | Situated near the Afon Mawddach on the opposite bank of the river to Llanelltyd village; accessed via a lane leading NE off the main road. | 4738 | See more images |
| St Celynnin's Church | Llangelynnin SH5712307205 52°38′37″N 4°06′47″W﻿ / ﻿52.643724584313°N 4.1131474640353°W﻿ / 52.643724584313; -4.1131474640353﻿ (St Celynnin's Church) | 17 June 1966 | Church | To the W of and below the A493 in Llangelynnin hamlet. The church stands in a rectangular churchyard, and is set into the steeply sloping ground above the railway and sea. | 4751 | See more images |
| Town Hall | Portmeirion, Penrhyndeudraeth SH5891037133 52°54′47″N 4°05′59″W﻿ / ﻿52.913050798466°N 4.0996608457508°W﻿ / 52.913050798466; -4.0996608457508﻿ (Town Hall) | 28 April 1952 | Town hall | Facing the Angel and Angel Gates at the western edge of the village group; set against the hill slope. | 4777 | See more images |
| St Tanwg's Church | Llanfair SH5687328241 52°49′57″N 4°07′34″W﻿ / ﻿52.832632794464°N 4.1260198371493°W﻿ / 52.832632794464; -4.1260198371493﻿ (St Tanwg's Church) | 30 November 1966 | Church | Located at the coast to SSW end of the village of Llandanwg. | 4790 | See more images |
| St Brothen's Church | Llanfrothen SH6221941185 52°57′01″N 4°03′08″W﻿ / ﻿52.950312555239°N 4.0522080540651°W﻿ / 52.950312555239; -4.0522080540651﻿ (St Brothen's Church) | 30 November 1966 | Church | Located on a sloping site at the SW edge of the small village of Llanfrothen; accessed via a footpath leading S from a lane running S to the Village from the B4410 Garreg to Rhyd road; set within a rubble-walled graveyard. | 4804 | See more images |
| St Mary and St Bodfan's Church | Llanaber, Barmouth SH5993018024 52°44′30″N 4°04′35″W﻿ / ﻿52.741653062836°N 4.0762985045146°W﻿ / 52.741653062836; -4.0762985045146﻿ (St Mary and St Bodfan's Church) | 3 April 1951 | Church | On a striking site overlooking the sea to the W of the slightly elevated main road; in a large graveyard behind rubble walls, accessed via a stone gabled lychgate. | 4906 | See more images |
| St Mark's Church | Brithdir and Llanfachreth SH7635718360 52°44′55″N 3°50′00″W﻿ / ﻿52.748687431401°N 3.8332371030814°W﻿ / 52.748687431401; -3.8332371030814﻿ (St Mark's Church) | 26 May 1995 | Church | Begun 1895 and consecrated in 1898; designed by H Wilson, a leading figure of the Arts and Crafts movement. | 16008 | See more images |
| Capel Jerusalem | Bethesda SH6245566745 53°10′48″N 4°03′35″W﻿ / ﻿53.179985430944°N 4.0596274872271°W﻿ / 53.179985430944; -4.0596274872271﻿ (Capel Jerusalem) | 25 April 1997 | Chapel | Situated in centre of Bethesda, fronting onto the gardens behind the War Memorial. | 18387 | See more images |
| St Baglan's Church | Bontnewydd SH4554460690 53°07′15″N 4°18′34″W﻿ / ﻿53.120951378836°N 4.3095419441351°W﻿ / 53.120951378836; -4.3095419441351﻿ (St Baglan's Church) | 29 May 1968 | Church | Situated NW of Llanfaglan, in an isolated situation in a field some 150m E of the minor road which runs N – S along the edge of the Afon Gwyrfai estuary. | 18619 | See more images |
| Dolbadarn Castle | Llanberis SH5860359791 53°06′59″N 4°06′51″W﻿ / ﻿53.116507273719°N 4.1141529435627°W﻿ / 53.116507273719; -4.1141529435627﻿ (Dolbadarn Castle) | 28 May 1999 | Castle | Situated on a natural rock outcrop in a strategic position at the north-west end of Llyn Peris, the castle forms a prominent feature in the landscape. | 21854 | See more images |
| Gilfach Ddu (housing the National Slate Museum) | Llanddeiniolen SH5855060280 53°07′15″N 4°06′55″W﻿ / ﻿53.120885793033°N 4.1151599699246°W﻿ / 53.120885793033; -4.1151599699246﻿ (Gilfach Ddu (housing the National Slate Museum)) | 4 November 1999 | Quarry workshops | Located at the south-east end of Llyn Padarn to the east of Llanberis, the quarry workshops sit at the foot of the vast workings of the former Dinorwic Slate Quarry. | 22656 | See more images |
| Harlech Castle | Harlech SH5811031240 52°51′36″N 4°06′32″W﻿ / ﻿52.859901568961°N 4.1089772533429°W﻿ / 52.859901568961; -4.1089772533429﻿ (Harlech Castle) | 21 June 2001 | Castle | Imposingly sited in the centre of the town with dramatic views across Tremadog Bay and towards Snowdonia. | 25500 | See more images |