Pontprennau and Old St Mellons
Pontprennau and Old St Mellons is one of 28 wards in Cardiff, home to 11,713 people in 4,910 households (Census 2021). Homes sold for a median of £299,995 over the past two years, 11% above the Cardiff median. On average 27% of the land within 500 metres of a home postcode is green space — 45% above the Cardiff average.
People and homes.
11,713 residents in 4,910 households, next to the Cardiff average.
Source: Census 2021, Office for National Statistics
Prices.
Quarterly median of standard sales in Pontprennau and Old St Mellons and Cardiff.
Source: HM Land Registry Price Paid Data, sales to 28 Aug 2026
Safety.
Police recorded 774 crimes and incidents in Pontprennau and Old St Mellons in the 12 months to Aug 2026: 66 per 1,000 residents, against 118 across Cardiff.
Police.uk records crimes by approximate location, not by where victims or offenders live. Busy streets, shops, stations and nightlife record more. Figures are counts, not a measure of personal risk. Rates per resident are higher wherever many people visit but few live, such as city centres.
Source: data.police.uk street-level crime, South Wales Police (Open Government Licence v3.0)
Food hygiene.
Food businesses in Pontprennau and Old St Mellons with a published hygiene rating.
Council food safety officers rate businesses from 0 (urgent improvement necessary) to 5 (very good) for hygiene, the state of the premises and how food safety is managed. A rating reflects the standards found on the day of inspection, not the quality of the food.
Source: Food Standards Agency, food hygiene rating data as of 26 October 2026 (Open Government Licence)
Compare Pontprennau and Old St Mellons.
Side by side with its nearest wards, from the same sources and dates.