Viaduct Road is in Gwaelod Y Garth, Cardiff and in Cardiff district. CF15 9JN is located in the Pentyrch and St Fagans electoral ward, within the English Parliamentary constituency of Cardiff West. This postcode has been in use since 1999-06-01.
StreetScan combines information about Viaduct Road, Gwaelod Y Garth, Cardiff, CF15 9JN and displays a report on the quality of life in this place and its surroundings.
Nearby postcodes are: CF15 8LA, CF15 9TT, CF15 7RJ, CF15 9TU, CF15 9TR.
In the UK, the overall gender distribution is approximately 49% male and 51% female. The local area around CF15 9JN is generally consistent with those figures, having a male population of 49.6%.
| 2011 | 2021 | 10y change (pp) | UK Average | postcode vs UK (pp) | |
|---|---|---|---|---|---|
| Female | 49.2% | 50.4% | 1.2% | 51.0% | -0.6% |
| Male | 50.8% | 49.6% | -1.2% | 49.0% | 0.6% |
Across the UK, the average relationship status breakdown is roughly 44% married, 38% single, 9% divorced, 6% widowed, and 2% separated.
| 2011 | 2021 | 10y change (pp) | UK Average | postcode vs UK (pp) | |
|---|---|---|---|---|---|
| Single | 32.2% | 35% | 2.8% | 37.9% | -2.9% |
| Married: Opposite sex | 46.6% | 44.7% | -1.9% | 44.2% | 0.5% |
| Married: Same sex | 1.2% | 0.6% | -0.6% | 0.3% | 0.3% |
| Separated | 1.8% | 3% | 1.2% | 2.2% | 0.8% |
| Divorced | 12.6% | 12.2% | -0.4% | 9.1% | 3.1% |
| Widowed | 5.5% | 4.6% | -0.9% | 6.1% | -1.5% |
Across the UK, the average 48.4% rated their health as Very Good, 33.6% as Good, 12.7% as Fair, 4% as Bad, and 1.2% as Very Bad.
Population age significantly impacts residents' health. Additionally, socioeconomic status plays a crucial role: higher income levels and lower poverty rates are linked to better health outcomes. Affluent areas benefit from higher living standards, access to private healthcare, and healthier lifestyle choices.
| 2011 | 2021 | 10y change (pp) | UK Average | postcode vs UK (pp) | |
|---|---|---|---|---|---|
| Very good health | 51.3% | 45.2% | -6.1% | 48.4% | -3.2% |
| Good health | 29.8% | 33.3% | 3.5% | 33.6% | -0.3% |
| Fair health | 12.5% | 15.2% | 2.7% | 12.7% | 2.5% |
| Bad health | 5.7% | 3.8% | -1.9% | 4.0% | -0.2% |
| Very bad health | 0.7% | 2.5% | 1.8% | 1.2% | 1.3% |
During the 2021 census, the educational qualifications of residents across the UK were as follows: 18.2% had no qualifications, 9.6% had 1-4 GCSEs, 13.4% had 5 or more GCSEs and 1-2 A/AS Levels, 16.9% had 2 or more A Levels, 33.8% held a degree (or equivalent), and 5.4% had completed an apprenticeship.
| 2011 | 2021 | 10y change (pp) | UK Average | postcode vs UK (pp) | |
|---|---|---|---|---|---|
| No qualifications | 19.6% | 12% | -7.6% | 18.2% | -6.2% |
| 1-4 GCSEs or Equivalent | 9.8% | 8.4% | -1.4% | 9.6% | -1.2% |
| 5 or more GCSEs, an A-Level or 1-2 AS Levels | 15% | 13.6% | -1.4% | 13.4% | 0.2% |
| Apprenticeship | 3.1% | 3.6% | 0.5% | 5.3% | -1.7% |
| HNC, HND or 2+ A Levels | 12.6% | 15.4% | 2.8% | 16.9% | -1.5% |
| Degree or Similar | 36.8% | 42.5% | 5.7% | 33.8% | 8.7% |
| Other | 3.1% | 4.5% | 1.4% | 2.8% | 1.7% |
In this area, the population is predominantly white, with 93.8% identifying as such, significantly higher than the UK average of 81.4%. This indicates a lower level of ethnic diversity compared to the broader UK population.
| 2011 | 2021 | 10y change (pp) | UK Average | postcode vs UK (pp) | |
|---|---|---|---|---|---|
| Bangladeshi | 0% | 0.5% | 0.5% | 1.1% | -0.6% |
| Chinese | 3.5% | 2.8% | -0.7% | 0.7% | 2.1% |
| Indian | 0.9% | 0.8% | -0.1% | 3.1% | -2.3% |
| Pakistani | 0% | 0.3% | 0.3% | 2.7% | -2.4% |
| Other Asian | 0.5% | 1% | 0.5% | 1.6% | -0.6% |
| Other Black | 0.2% | 0% | -0.2% | 0.5% | -0.5% |
| Mixed White and Asian | 0.2% | 0.5% | 0.3% | 0.8% | -0.3% |
| Mixed White and Caribbean | 0.2% | 0.3% | 0.1% | 0.9% | -0.6% |
| Mixed Other | 0.5% | 0% | -0.5% | 0.8% | -0.8% |
| White | 93.1% | 93.8% | 0.7% | 81.4% | 12.4% |
| Arab | 0.7% | 0% | -0.7% | 0.6% | -0.6% |
| Other | 0% | 0.3% | 0.3% | 1.6% | -1.3% |
In this area, 93.8% of the population were born in the United Kingdom, which is higher than the UK average of 83.2%.
| 2011 | 2021 | 10y change (pp) | UK Average | postcode vs UK (pp) | |
|---|---|---|---|---|---|
| United Kingdom | 94.8% | 93.8% | -1.0% | 83.2% | 10.6% |
| European Union | 2.1% | 1.7% | -0.4% | 6.1% | -4.4% |
| Rest of Europe | 0% | 1.5% | 1.5% | 0.8% | 0.7% |
| Africa | 0.2% | 0% | -0.2% | 2.7% | -2.7% |
| Middle East and Asia | 2.4% | 3% | 0.6% | 5.6% | -2.6% |
| The Americas and the Caribbean | 0.5% | 0% | -0.5% | 1.3% | -1.3% |
| 2011 | 2021 | 10y change (pp) | UK Average | postcode vs UK (pp) | |
|---|---|---|---|---|---|
| Born in the UK | 93.9% | 94.3% | 0.4% | 83.2% | 11.1% |
| 10+ Years | 0.5% | 2.8% | 2.3% | 9.8% | -7.0% |
| 5-10 Years | 1.7% | 1% | -0.7% | 2.9% | -1.9% |
| 2-5 Years | 1.9% | 1.3% | -0.6% | 2.2% | -0.9% |
| Less than 2 years | 2.1% | 0.8% | -1.3% | 1.9% | -1.1% |
| 2021 | UK Average | postcode vs UK (pp) | |
|---|---|---|---|
| United Kingdom | 81.1% | 76.7% | 4.4% |
| Ireland | 0.5% | 0.6% | -0.1% |
| France | 0.3% | 0.3% | 0.0% |
| Lithuania | 0.3% | 0.3% | 0.0% |
| Other EU countries | 1.5% | 1.5% | 0.0% |
| Other Europe | 0.3% | 0.2% | 0.1% |
| Middle East | 0.3% | 0.1% | 0.2% |
| Eastern Asia | 0.8% | 0.3% | 0.5% |
| South-East Asia | 1% | 0.2% | 0.8% |
| No passport held | 14.1% | 13.5% | 0.6% |
| 2021 | UK Average | postcode vs UK (pp) | |
|---|---|---|---|
| No religion | 51.9% | 37.2% | 14.7% |
| Christian | 39% | 46.2% | -7.2% |
| Buddhist | 0.3% | 0.5% | -0.2% |
| Jewish | 0.3% | 0.5% | -0.2% |
| Muslim | 0.8% | 6.5% | -5.7% |
| Other religion | 0.3% | 0.6% | -0.3% |
| Not answered | 7.6% | 6.0% | 1.6% |
Over the last 12 months, the overall crime rate around Viaduct Road was 116.5 per 1,000 residents, which is 140.3% higher than the Pentyrch and St Fagans average. The most reported crime type was Violence and sexual offences.
Viaduct Road has the 2nd highest crime rate of 23 local areas in Pentyrch and St Fagans and the 304th highest crime rate of 1,028 local areas in Cardiff .
Violent and sexual offences accounted for around 55.8 crimes per 1,000 residents and have been rising year on year. Over the last decade, overall crime has fallen by about -23.5%.

Households in this area have a higher level of wealth to the average household in England and Wales. 83% of analyzed areas in England and Wales have lower average household annual income than this area.

| Address | Sale Price | Sale Date | Price Estimate 2025 |
|---|---|---|---|
| Servonetic Control Instruments Ltd Viaduct Road, Cardiff, Cardiff Other, an established residential building | £235,000 | 2020-10-30 | £278,623 |
| Unit 3 Viaduct Road, Cardiff, Cardiff Other, an established residential building | £196,000 | 2018-04-03 | £240,446 |
| 4 Viaduct Road, Cardiff, Cardiff Other, an established residential building | £225,000 | 2017-04-13 | £282,319 |
| Unit 3 Viaduct Road, Cardiff, Cardiff Other, an established residential building | £150,000 | 2016-11-25 | £192,358 |
| Securicor Information Systems Ltd Viaduct Road, Cardiff, Cardiff Detached, an established residential building | £335,000 | 2005-07-12 | £629,431 |
| Full-Time Employee | 116 |
| Retired | 76 |
| Part-Time Employee | 39 |
| Self-Employed | 19 |
| Long-Term Sick or disabled | 18 |
| Student (economically inactive) | 17 |
| Unemployed | 15 |
| Looking after home or family | 10 |
| Other | 9 |
| Full-Time Student (with or without job) | 9 |
| Human health and social work activities | 32 |
| Education | 31 |
| Wholesale and retail trade; repair of motor vehicles and motor cycles | 26 |
| Public administration and defence; compulsory social security | 15 |
| Other | 13 |
| Construction | 13 |
| Accommodation and food service activities | 11 |
| Manufacturing | 11 |
| Professional, scientific and technical activities | 10 |
| Financial and insurance activities | 9 |
| Administrative and support service activities | 7 |
| Electricity, gas, steam and air conditioning supply | 5 |
| Information and communication | 5 |
| Real estate activities | 4 |
| Transport and storage | 3 |
| Water supply; sewerage, waste management and remediation activities | 3 |
| Ofsted Overall Effectiveness | Distance | Establishment Type | Has Nursery Classes | Gender | More Info | |
|---|---|---|---|---|---|---|
| Y G G Gwaelod y Garth Main Road , Gwaelodygarth CF15 9HJ | - not rated | 886 yd | Welsh establishment | Not Applicable | Not applicable | More About School |
| Ffynnon Taf Primary School Cardiff Road , Taffs Well CF15 7PR | - not rated | 1,032 yd | Welsh establishment | Not Applicable | Not applicable | More About School |
| Tongwynlais Primary School Merthyr Road , Tongwynlais CF15 7LF | - not rated | 1,422 yd | Welsh establishment | Not Applicable | Not applicable | More About School |
| Bryn Deri Primary School Caer Graig , Radyr CF15 8RD | - not rated | 2,137 yd | Welsh establishment | Not Applicable | Not applicable | More About School |
| Radyr Primary School Park Road , Radyr CF15 8DF | - not rated | 2,497 yd | Welsh establishment | Not Applicable | Not applicable | More About School |
School statistics for this postcode are based on Ofsted rankings.
| Business Name | Address | Food hygiene rating | Distance |
|---|---|---|---|
| Lew's Coffee Shop @ Castell Coch | Castell Coch Castle Road, Tongwynlais | 751 yd |
| Business Name | Address | Food hygiene rating | Distance |
|---|---|---|---|
| Taffs Well AFC | Rhiw'r Ddar | 957 yd |
| Business Name | Address | Food hygiene rating | Distance |
|---|---|---|---|
| Hard Lines | Unit 13, Fairfield Industrial Estate Main Road, Gwaelod-y-garth | 103 yd | |
| Taffs Well Post Office | 27 Cardiff Road | 452 yd |
| Business Name | Address | Food hygiene rating | Distance |
|---|---|---|---|
| Co-operative Group Food Ltd | 30 Cardiff Road | 537 yd |
This statistics are based on Active Places Data - Contains Data © Sport England
| Percentage of premises that have Superfast Broadband (30Mbit/s or greater) coverage from fixed broadband | 100.0% |
| Percentage of premises that have Ultrafast Broadband (100Mbit/s or greater) coverage from fixed broadband | 0.0% |
| Percentage of premises that have Ultrafast Broadband (300Mbit/s or greater) coverage from fixed broadband | 0.0% |
| Percentage of premises that have coverage from a Gigabit capable service from fixed broadband | 0.0% |
| Percentage of premises unable to receive 2Mbit/s | 0.0% |
| Percentage of premises unable to receive 5Mbit/s | 0.0% |
| Percentage of premises unable to receive 10Mbit/s | 0.0% |
| Percentage of premises unable to receive 30Mbit/s | 0.0% |
Broadband statistics are based on Ofcom's Communications Market Report (CMR) 2022.