Trethomas’s story
No listed buildings inside Trethomas’s built-up area
11% of its homes were built before 1919, against 15% in the typical UK town.
Explore the history →
TrethomasGwent
A village of 1,713 in Gwent, Wales.
7 places within 12 milesMap →
Photo: Roger Cornfoot · CC BY-SA 2.0
Population
1,713
Census 2021 · Caerphilly council
Median home
£245K
29 sales in 3 years
Median age
33.8
14% are 65+ · Gwent 20%
Degree level
20%
of residents 16+ · Wales 31%
Walk, cycle, bus
17%
of commuters · Wales 16%
Is Trethomas a good place to live?
Trethomas has fewer than 2,500 residents, so it gets subject grades but no overall grade. Its strongest subject is walkability (B+): 17% of commuters walk, cycle or take public transport. Its weakest is safety (D−): 58 violent and sexual offences and 19.5 home and vehicle crimes per 1,000 residents a year, averaged Sep 2023 to Aug 2026. Among UK towns of 1,000 to 2,500 people, it has less crime per resident than 2%. The median home sold for £245,000 in the last three years, 5.8 times what households in the Caerphilly council area earn in a year.
This town's Health Grade uses 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' grades also use OHID's small-area early deaths, hospital admissions and child obesity, which OHID publishes for England only.
What makes Trethomas stand out
The 3 things Trethomas does most differently from other towns.
Claimant rate, against UK towns
Work
of 16 to 64s in 2026: more than in 99% of UK towns
DWP claimant count, January to August 2026.
Degree level, 16+
Education
20% have a degree
Degree-level qualifications, residents 16+ (Wales’s towns 31%)
Gwent 28%.
Residents 65 and over
Who lives here
Only 14% are 65 or over
Against 21% across Wales’s towns
How Trethomas grades
Each subject compared with the 2,160 UK towns with an overall grade (schools within Wales), ordered by how far Trethomas is from typical. American towns are graded separately.
SafetyD−Open →Jobs & incomeDOpen →Health9.3% in bad or very bad health, 25% disabled (adjusted for age in the grade)DOpen →WalkabilityB+Open →Hazard risk0.1% of homes at high or medium risk of flooding from rivers or the seaB−Open →Cost of livingrent £747 a monthB−Open →
SchoolsNot published in Wales–
Character Graded, but not part of the overall grade.
History0 listed buildingsD−Open →Outdoors48% live within 400 m of a park; 6.9 ha of public green space per 1,000 residentsB−Open →Civic life1.8 local charities per 1,000 residents; 0% live within 1 km of a libraryC−Open →
How TownRatings grades towns →
Nearby attractions
All attractions →Caerphilly Castle and 3 more in and around Trethomas
Museums, castles, gardens and days out in and near Trethomas. Best known first.
CastleCastle · CadwCaerphilly Castle3.6 km outside town, to the southwest
CastleRuperra Castle3.4 km outside town, to the southeast
CastleCraig Ruperra Motte3.4 km outside town, to the southeastCastleCastleCastell Meredydd2.9 km outside town, to the east
CastleRuperra Castle3.4 km outside town, to the southeastCastleCraig Ruperra Motte3.4 km outside town, to the southeastCastleCastleCastell Meredydd2.9 km outside town, to the eastPlaces: © OpenStreetMap contributors · Wikidata
Photos: each place’s Wikidata image, from Wikimedia Commons under the licence below (our copy, resized).
Photo credits (2)
- Ruperra Castle: Andrew King, CC BY-SA 2.0, Wikimedia Commons
- Craig Ruperra Motte: Jeremy Bolwell, CC BY-SA 2.0, Wikimedia Commons
The data
Data highlights are ordered by what stands out in Trethomas.
Safety
Trethomas has more crime per resident than 96% of UK towns
Violence came to 58 per 1,000 residents a year, above both Gwent’s towns (36.5) and Wales’s towns (33.8). Police recorded 148 crimes inside Trethomas’s built-up area in the 12 months to August 2026, plus 31 reports of anti-social behaviour. Violence and sexual offences were 55% of the crimes; the police category includes harassment and stalking.
58violent and sexual offences per 1,000 a yearD−Safety Grade
Compared with UK towns its sizeLess crime per resident than 2% of the 1,541 UK towns of 1,000 to 2,500 people: more crime than most for its size. Context only, not part of the grade.
Reports by type · Sep 2025 to Aug 2026
Violence & sexual81
Public order21
Damage & arson20
Other theft7
Burglary6
Other crime4
Drugs3
Vehicle crime3
Anti-social31
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.
58
violent and sexual offences per 1,000 residents a year, averaged Sep 2023 to Aug 2026
19.5
burglary, vehicle crime and damage per 1,000 a year, averaged Sep 2023 to Aug 2026
12.5
anti-social behaviour reports per 1,000 (not graded)
148
crimes recorded in the 12 months to August 2026
data.police.uk street-level crime · points inside the ONS built-up-area boundary · OGL
Schools
1 state school in Trethomas
Its one school is below. Wales publishes no school-level results, so its schools have no letters.
| School | Level | Pupils | Letter |
|---|---|---|---|
| Graig-Y-Rhacca Primary and Nursery Community SchoolLargest primary schoolPrimary | Primary | 105 | – |
Welsh Government · schools listThe Schools page →
History
Most of Trethomas is newer: only 11% of homes were built before 1919, below Gwent’s towns and Wales’s towns
The heritage lists give each building’s grade but not its age, so we don’t say which is oldest.
On this, Trethomas is below both Gwent’s towns (26%) and Wales’s towns (27%).
0listed buildingsD−History Grade
Listed buildings by grade · Cadw
Grade I0
Grade II*0
Grade II0
0
scheduled monuments
0
registered parks and gardens
11%
of homes built before 1919 · typical UK town 15%
0
listed buildings per 10,000 residents · typical UK town 24
Cadw list, October 2026 · Valuation Office Agency, homes by build period · OGL
Who lives here
A town of families: 25% of people in Trethomas are under 15, more than in Gwent’s towns or Wales’s towns
In the comparison, Trethomas comes above both Gwent’s towns (18%) and Wales’s towns (17%). People 65 and over make up 14% of the town.
33.8median age
TrethomasGwentWales
Ages · share of residents
12%
Qualifications · residents 16 and older
No qualifications27%
Apprenticeship5%
A levels or similar15%
Degree level20%
Women and men · all residents
53% women, 47% men
About 89 men for every 100 women. Across Wales, 51% of residents are women.
| Trethomas | Gwent | Wales | |
|---|---|---|---|
| Under 15 | 25% | 18% | 17% |
| 15–24 | 12% | 11% | 12% |
| 25–44 | 27% | 26% | 25% |
| 45–64 | 22% | 27% | 26% |
| 65+ | 14% | 20% | 21% |
| No qualifications | 27% | 23% | 20% |
| Apprenticeship | 5% | 5.4% | 5.6% |
| A levels or similar | 15% | 16% | 17% |
| Degree level | 20% | 28% | 31% |
ONS Census 2021 · Gwent and Wales: all residents of their built-up areas · OGL
Health
Only 73% of people in Trethomas say their health is good or very good, fewer than in Gwent’s towns and Wales’s towns
For Trethomas, that is below both Gwent’s towns (77%) and Wales’s towns (78%). Trethomas has no GP practice of its own; the nearest is 1 miles away. These answers aren’t adjusted for age, so young towns look healthier; the Health Grade uses age-adjusted measures, including life expectancy.
73%good or very good healthDHealth Grade
General health, self-reported
Good or very good 73%Fair 17%Bad or very bad 9%
| Census 2021 | Trethomas | Gwent | Wales |
|---|---|---|---|
| Good or very good health | 73% | 77% | 78% |
| Bad or very bad health | 9.3% | 7.7% | 7.1% |
| Disabled (Equality Act) | 25% | 22% | 22% |
78
life expectancy at birth, men (2019–23)
82.9
life expectancy at birth, women
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 · ONS, life expectancy 2019–23 · OGL
Work & commuteJobs & income grade D
7% of 16 to 64s in Trethomas claim unemployment benefits, more than in Gwent’s towns and Wales’s towns
The Census was taken on 21 March 2021, in lockdown, so 18% of workers were mainly at home; shares here are of those who travelled.
Trethomas sits above both Gwent’s towns (3.2%) and Wales’s towns (3%) on this measure. Household income averages £47K a year before tax.
17%walk, cycle or ride
How commuters got to work · March 2021
Driving79%
Bus8%
On foot6%
Bicycle2%
Train2%
36%
of commuters travel under 5 km · Wales 41%
18%
worked mainly from home in March 2021
£47K
mean household income, before tax
7%
of 16 to 64s claim unemployment benefits (2026)
B+
Walkability: more walkable than 67% of UK towns
ONS Census 2021, method of travel and distance to work · ONS small-area income · DWP claimant count · OGL
HousingCost of living grade B−
Home ownership in Trethomas, 45%, runs below Gwent’s towns and Wales’s towns
That puts Trethomas below both Gwent’s towns (65%) and Wales’s towns (65%). Social housing holds 48% of households.
£245Kmedian sale
Median sale price · Sep 2023 to Aug 2026
Trethomas£245K
Typical UK town£277K
| By type | Median | Sales |
|---|---|---|
| Semi-detached | £265,000 | 15 |
| Terraced | £94,750 | 10 |
45%
of households own their home · Wales 65%
7%
rent privately · Wales 17%
£747
average private rent a month, Caerphilly council area
£2,083
council tax, Band D, 2026–27
HM Land Registry Price Paid · ONS private rents · MHCLG / Welsh Government council tax · ONS Census 2021 tenure · OGL
Keep exploring
Everything we know about Trethomas
14pages on Trethomas
The big questions
SafetyD−58 violent and sexual offences per 1,000 residents a year, averaged Sep 2023 to Aug 2026Cost of livingB−Median home £245K · rent £747 a monthHousing5 sold in 12 months · busiest street Summerfield LaneSchools1 state school (no results published in Wales)HealthDWork & commuteD36% of working residents work in the townFlood & hazardsB−0.1% of homes at high or medium flood risk
Out and about
Trethomas’s neighbours
The nearest built-up areas, from ONS’s 2022 boundaries. See them on the map →
BedwasMachenCwmfelinfachLlanbradachCaerphillyRiscaAbercarnTrethomas
How the neighbours grade
| Town | People | Miles | Overall | Cost | Safety | Health |
|---|---|---|---|---|---|---|
| Trethomas | 1,713 | — | — | B− | D− | D |
| Bedwas | 6,463 | 1.3 | D | B− | C− | D |
| Machen | 1,985 | 1.3 | — | B− | B | C |
| Cwmfelinfach | 1,353 | 1.7 | — | A | C | D |
| Llanbradach | 3,766 | 2.8 | C | A− | C− | D |
| Caerphilly | 33,104 | 2.9 | D | B− | D | D |
| Risca | 15,194 | 3 | C− | A− | D | D |
| Abercarn | 5,123 | 4 | C | A− | C− | D |
Machen and Cwmfelinfach have fewer than 2,500 residents, so they get subject grades but no overall grade. People: Census 2021. Miles: centre to centre.
Questions about Trethomas
Who lives in Trethomas?
A young village. At the 2021 Census, 25% of residents were under 15 and 27% were 25 to 44, against 17% and 25% across Wales’s towns; only 14% were 65 or over.
How much is council tax in Trethomas?
Band D council tax in Trethomas is £2,083 for 2026–27, less than in 85% of UK towns (the Caerphilly council average, with police and community councils). Your own bill depends on your home’s band; check it on GOV.UK.
About Trethomas
Village in Gwent, Wales
Trethomas is a built-up area of 1,713 people, in the Caerphilly 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
- 1,713 (Census 2021)
- Council
- Caerphilly
- County
- Gwent
- Region
- Wales
- Area
- 0.1 sq mi (0.3 km²)
- ONS code
- W45000543
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.