Trearddur’s story
5 listed buildings
Cadw lists them inside Trearddur’s built-up area.
15% of its homes were built before 1919, against 15% in the typical UK town.
Explore the history →
TrearddurGwynedd
A village of 932 in Gwynedd, Wales.
5 places within 12 milesMap →
Photo: Ian Greig · CC BY-SA 2.0
Population
932
Census 2021 · Isle of Anglesey council
Median home
£345K
47 sales in 3 years
Median age
58.9
38% are 65+ · Gwynedd 23%
Degree level
37%
of residents 16+ · Wales 31%
Walk, cycle, bus
11%
of commuters · Wales 16%
Is Trearddur a good place to live?
Trearddur has fewer than 1,000 residents, too few for fair grades; the figures on this page are still real.
What makes Trearddur stand out
The 3 things Trearddur does most differently from other towns.
Listed buildings per 10,000 residents
History
0 Grade II*; 2.2 times the typical UK town for its size
Cadw’s list, October 2026.
Residents 65 and over
Who lives here
38% are 65 or over
Against 21% across Wales’s towns
Own outright
Housing
62% own outright
of households own their home with no mortgage (Wales’s towns 36%)
The data
Data highlights are ordered by what stands out in Trearddur.
Who lives here
Children make up only 9.1% of Trearddur, fewer than in both Gwynedd’s towns and Wales’s towns
People aged 15 to 24 are 7.7% of the population. 38% of residents are 65 or over, higher than both Gwynedd’s towns (23%) and Wales’s towns (21%). Residents of Trearddur have a median age of 58.9. Degrees are held by 37% of adults.
58.9median age
TrearddurGwyneddWales
Ages · share of residents
38%
Qualifications · residents 16 and older
No qualifications14%
Apprenticeship7%
A levels or similar18%
Degree level37%
Women and men · all residents
52% women, 48% men
About 91 men for every 100 women. Across Wales, 51% of residents are women. Women live longer than men, so towns with many older residents have more women.
| Trearddur | Gwynedd | Wales | |
|---|---|---|---|
| Under 15 | 9.1% | 16% | 17% |
| 15–24 | 7.7% | 13% | 12% |
| 25–44 | 14% | 22% | 25% |
| 45–64 | 31% | 26% | 26% |
| 65+ | 38% | 23% | 21% |
| No qualifications | 14% | 18% | 20% |
| Apprenticeship | 7.3% | 6.1% | 5.6% |
| A levels or similar | 18% | 19% | 17% |
| Degree level | 37% | 32% | 31% |
ONS Census 2021 · Gwynedd and Wales: all residents of their built-up areas · OGL
Work & commute
Only 11% of commuters in Trearddur go to work without a car, fewer than in both Gwynedd’s towns and Wales’s towns
The Census was taken on 21 March 2021, in lockdown, so 28% of workers were mainly at home; shares here are of those who travelled.
The 2026 claimant rate among 16 to 64s was 2.4%. 87% of commuters drove, above both Gwynedd’s towns (79%) and Wales’s towns (81%). The census counted 28% of workers working mainly from home.
11%walk, cycle or ride
How commuters got to work · March 2021
Driving87%
On foot7%
Bicycle3%
Bus1%
44%
of commuters travel under 5 km · Wales 41%
28%
worked mainly from home in March 2021
£46K
mean household income, before tax
2.4%
of 16 to 64s claim unemployment benefits (2026)
ONS Census 2021, method of travel and distance to work · ONS small-area income · DWP claimant count · OGL
Housing
Buying in Trearddur costs more than in both Gwynedd’s towns and Wales’s towns: the median sale is £345K
Just over four in five households own their home, higher than both Gwynedd’s towns (63%) and Wales’s towns (65%). The social rented sector houses 1% of households. Private rents average £714 a month across the Isle of Anglesey council area.
£345Kmedian sale
Median sale price · Sep 2023 to Aug 2026
Trearddur£345K
Typical UK town£277K
| By type | Median | Sales |
|---|---|---|
| Detached | £390,000 | 30 |
| Semi-detached | £567,500 | 6 |
| Flat or maisonette | £225,000 | 9 |
82%
of households own their home · Wales 65%
£714
average private rent a month, Isle of Anglesey council area
£2,261
council tax, Band D, 2026–27
HM Land Registry Price Paid · ONS private rents · MHCLG / Welsh Government council tax · ONS Census 2021 tenure · OGL
Safety
Violence is recorded less often in Trearddur than in Gwynedd’s towns or across Wales’s towns: 18 per 1,000 residents a year
Homes saw 5.4 burglaries and acts of damage per 1,000 residents a year, below both Gwynedd’s towns (8.7) and Wales’s towns (10.7). In the 12 months to August 2026, police logged 25 crimes and 12 reports of anti-social behaviour inside Trearddur’s built-up area. Violence and sexual offences accounted for 60% of recorded crime.
18violent and sexual offences per 1,000 a year
Reports by type · Sep 2025 to Aug 2026
Violence & sexual15
Other theft5
Damage & arson3
Public order1
Other crime1
Shoplifting0
Burglary0
Drugs0
Anti-social12
Not gradedAnti-social behaviour, shoplifting and other theft are shown but left out of the Safety Grade, which counts violence and crimes against homes and vehicles per resident.
18
violent and sexual offences per 1,000 residents a year, averaged Sep 2023 to Aug 2026
5.4
burglary, vehicle crime and damage per 1,000 a year, averaged Sep 2023 to Aug 2026
9.7
anti-social behaviour reports per 1,000 (not graded)
25
crimes recorded in the 12 months to August 2026
data.police.uk street-level crime · points inside the ONS built-up-area boundary · OGL · The police category of violence and sexual offences includes harassment and stalking.
Health
82% of people in Trearddur say their health is good or very good, more than in both Gwynedd’s towns and Wales’s towns
5.1% of residents described their health as bad or very bad, below Gwynedd’s towns (5.5%) and Wales’s towns (7.1%) alike. Trearddur has no GP practice of its own; the nearest is 1.3 miles away. The nearest A&E to Trearddur is Ysbyty Gwynedd, 19.9 miles away.
82%good or very good health
General health, self-reported
Good or very good 82%Fair 13%Bad or very bad 5%
| Census 2021 | Trearddur | Gwynedd | Wales |
|---|---|---|---|
| Good or very good health | 82% | 80% | 78% |
| Bad or very bad health | 5.1% | 5.5% | 7.1% |
| Disabled (Equality Act) | 20% | 20% | 22% |
Welsh towns’ Health Grades use ONS’s small-area life expectancy and healthy life expectancy for 2019 to 2023, and two Census 2021 measures, bad health and disability, adjusted for age. English towns’ also use OHID’s small-area early deaths, hospital admissions and child obesity, which OHID publishes for England only.
ONS Census 2021, general health and disability · OGL · Self-reported health favours young towns, since these answers ignore age; the Health Grade leans on age-adjusted measures such as life expectancy.
History
All 5 of Trearddur’s listed buildings are Grade II
The heritage lists give each building’s grade but not its age, so we don’t say which is oldest.
Homes from before 1919 make up 15% of the total, below both Gwynedd’s towns (40%) and Wales’s towns (27%). Listed buildings per head: 54 for every 10,000 residents of Trearddur.
5listed buildings
Listed buildings by grade · Cadw
Grade I0
Grade II*0
Grade II5
0
scheduled monuments
0
registered parks and gardens
15%
of homes built before 1919 · typical UK town 15%
54
listed buildings per 10,000 residents · typical UK town 24
Cadw list, October 2026 · Valuation Office Agency, homes by build period · OGL
Nearby attractions
All attractions →Caer Gybi Roman Fort and 3 more in and around Trearddur
Museums, castles, gardens and days out in and near Trearddur. Best known first.
FortCaer Gybi Roman Fort2.3 km outside town, to the north
MuseumHolyhead Maritime Museum3 km outside town, to the north
FortWorld War II Pillbox100 m outside town, to the southMuseumMuseumHolyhead at War2.9 km outside town, to the northPlaces: © OpenStreetMap contributors · Wikidata
Photos: each place’s Wikidata image, from Wikimedia Commons under the licence below (our copy, resized).
Photo credits (3)
- Caer Gybi Roman Fort: Nigel Mykura, CC BY-SA 2.0, Wikimedia Commons
- Holyhead Maritime Museum: Cls14, CC BY-SA 3.0, Wikimedia Commons
- World War II Pillbox: Eric Jones, CC BY-SA 2.0, Wikimedia Commons
Keep exploring
Everything we know about Trearddur
14pages on Trearddur
The big questions
Safety18 violent and sexual offences per 1,000 residents a year, averaged Sep 2023 to Aug 2026Cost of livingMedian home £345K · rent £714 a monthHousing17 sold in 12 months · busiest street Lon St FfraidSchoolsHealthWork & commute46% of working residents work in the townFlood & hazards6.9% of homes at high or medium flood risk
Trearddur’s neighbours
The nearest built-up areas, from ONS’s 2022 boundaries. See them on the map →
HolyheadValleyBodedernLlanerchymeddCemaesTrearddur
How the neighbours grade
| Town | People | Miles | Overall | Cost | Safety | Health |
|---|---|---|---|---|---|---|
| Trearddur | 932 | — | — | — | — | — |
| Holyhead | 11,753 | 1.6 | C− | A | D | D |
| Valley | 2,003 | 2.4 | — | B | B | C+ |
| Bodedern | 1,193 | 5 | — | A− | B− | C− |
| Llanerchymedd | 1,155 | 11 | — | A | B+ | C− |
| Cemaes | 1,023 | 11 | — | B+ | B− | C− |
Valley, Bodedern, Llanerchymedd and Cemaes have fewer than 2,500 residents, so they get subject grades but no overall grade. People: Census 2021. Miles: centre to centre.
Questions about Trearddur
How many listed buildings are there in Trearddur?
5 on Cadw’s list. That is 2.2 times the typical UK town for its size.
How much is council tax in Trearddur?
Band D council tax in Trearddur is £2,261 for 2026–27, less than in 79% of UK towns (the Isle of Anglesey council average, with police and community councils). Your own bill depends on your home’s band; check it on GOV.UK.
About Trearddur
Village in Gwynedd, Wales
Trearddur is a built-up area of 932 people, in the Isle of Anglesey council area. TownRatings uses ONS’s 2022 built-up areas as towns: the physical town, as people mean the word, rather than a council district, so its figures cover the town itself.
Built from ONS geography and Census 2021
- Population
- 932 (Census 2021)
- Council
- Isle of Anglesey
- County
- Gwynedd
- Region
- Wales
- Area
- 0.6 sq mi (1.6 km²)
- ONS code
- W45000032
Sources: ONS Census 2021, output areas summed to the ONS 2022 built-up area · HM Land Registry Price Paid (standard sales, September 2023 to August 2026) · ONS Price Index of Private Rents (August 2026, by council) · MHCLG and Welsh Government council tax, Band D 2026–27 (with parish precepts in England) · data.police.uk street-level crime, 36 months to August 2026, points inside the built-up-area boundary · ONS small-area life expectancy and healthy life expectancy, 2019 to 2023 (England and Wales), OHID Fingertips small-area indicators (England) and Census 2021 health, adjusted for age · ONS small-area income estimates (financial year ending 2023) · DWP claimant count via Nomis (January to August 2026) · Cadw listed buildings, scheduled monuments and registered historic parks and gardens via DataMapWales, October 2026, inside the ONS 2022 built-up-area boundary · Valuation Office Agency, Council Tax: stock of properties by build period (31 March 2025) · TownRatings grades: our own summary of the data, ranked against UK towns only. All under the Open Government Licence v3.0.
Contains public sector information licensed under the Open Government Licence v3.0. Contains HM Land Registry data © Crown copyright and database right 2026. Contains OS data © Crown copyright and database right 2026 (ONS boundaries). Northern Ireland: Source: NISRA; contains Land & Property Services data and Ordnance Survey of Northern Ireland information, © Crown copyright, licensed under the Open Government Licence v3.0. Scotland: contains National Records of Scotland data, Registers of Scotland data and SEPA data, © Crown copyright / © SEPA 2025, licensed under the Open Government Licence v3.0.