Pontprennau and Old St Mellons
vs Trowbridge
Pontprennau and Old St Mellons has the younger population: 19% of residents are aged 15–29, against 19% in Trowbridge. Homes in Pontprennau and Old St Mellons sold for a median of £299,995, 30% above Trowbridge. Pontprennau and Old St Mellons has more green space nearby (27% within 500 m, against 22%).
People
Pontprennau and Old St Mellons has 11,713 residents in 4,910 households; Trowbridge has 17,237 in 7,014. The share of residents aged 65 and over is about the same in both (11% and 12%). Trowbridge has the higher share of people living alone: 31%, 3.8 percentage points more than Pontprennau and Old St Mellons (Cardiff: 32%).
Homes and prices
The most common type of home is detached houses in Pontprennau and Old St Mellons (44%) and semi-detached houses in Trowbridge (41%). Pontprennau and Old St Mellons has the higher share of owner-occupied homes: 71%, 20.2 percentage points more than Trowbridge (Cardiff: 58%). Pontprennau and Old St Mellons has the higher share of private renting: 18%, 2.4 percentage points more than Trowbridge (Cardiff: 24%). Over two years, homes sold for a median of £299,995 in Pontprennau and Old St Mellons and £230,000 in Trowbridge, against £270,000 across Cardiff.
Surroundings
Pontprennau and Old St Mellons has the higher share of land within 500 m that is green space: 27%, 4.6 percentage points more than Trowbridge (Cardiff: 19%). A typical postcode has 48 everyday shops and services within a 15-minute walk in Pontprennau and Old St Mellons, and 51 in Trowbridge. The typical postcode is 570 m from the nearest school in Pontprennau and Old St Mellons and 284 m in Trowbridge. The typical postcode is 3,484 m from the nearest tram stop or railway station in Pontprennau and Old St Mellons and 5,702 m in Trowbridge. Gigabit-capable broadband reaches 91% of premises in Pontprennau and Old St Mellons and 93% in Trowbridge.
Safety
Over 12 months, police recorded 66 crimes and incidents per 1,000 residents in Pontprennau and Old St Mellons and 109 in Trowbridge, 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.
Sources: Census 2021 (ONS) · HM Land Registry Price Paid Data · official school registers · © OpenStreetMap contributors · Environment Agency · data.police.uk, 12 months to Aug 2026 · Ofcom Connected Nations
In brief.
Each ward in a few lines, from its own page.
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.
Trowbridge is one of 28 wards in Cardiff, home to 17,237 people in 7,014 households (Census 2021). Homes sold for a median of £230,000 over the past two years, 15% below the Cardiff median. On average 22% of the land within 500 metres of a home postcode is green space — 20% above the Cardiff average.
More comparisons.
Pontprennau and Old St Mellons and Trowbridge next to other wards of Cardiff.