Cathays
vs Plasnewydd
Cathays has the younger population: 77% of residents are aged 15–29, against 47% in Plasnewydd. Homes in Plasnewydd sold for a median of £256,500, in line with Cathays. Cathays has more green space nearby (10% within 500 m, against 5%).
People
Cathays has 21,823 residents in 6,168 households; Plasnewydd has 18,270 in 7,719. Plasnewydd has the higher share of residents aged 65 and over: 7%, 4 percentage points more than Cathays (Cardiff: 15%). Plasnewydd has the higher share of people living alone: 39%, 9.2 percentage points more than Cathays (Cardiff: 32%).
Homes and prices
In both, terraced houses are the most common type of home: 48% of homes in Cathays and 43% in Plasnewydd. Plasnewydd has the higher share of owner-occupied homes: 34%, 12.8 percentage points more than Cathays (Cardiff: 58%). Cathays has the higher share of private renting: 72%, 18.1 percentage points more than Plasnewydd (Cardiff: 24%). Over two years, homes sold for a median of £250,000 in Cathays and £256,500 in Plasnewydd, against £270,000 across Cardiff.
Surroundings
Cathays has the higher share of land within 500 m that is green space: 10%, 4.5 percentage points more than Plasnewydd (Cardiff: 19%). A typical postcode has 486 everyday shops and services within a 15-minute walk in Cathays, and 342 in Plasnewydd. The typical postcode is 596 m from the nearest school in Cathays and 276 m in Plasnewydd. The typical postcode is 476 m from the nearest tram stop or railway station in Cathays and 898 m in Plasnewydd. Gigabit-capable broadband reaches 83% of premises in Cathays and 96% in Plasnewydd.
Safety
Over 12 months, police recorded 334 crimes and incidents per 1,000 residents in Cathays and 129 in Plasnewydd, 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.
Cathays is one of 28 wards in Cardiff, home to 21,823 people in 6,168 households (Census 2021). Homes sold for a median of £250,000 over the past two years, 7% below the Cardiff median. On average 10% of the land within 500 metres of a home postcode is green space — 48% below the Cardiff average.
Plasnewydd is one of 28 wards in Cardiff, home to 18,270 people in 7,719 households (Census 2021). Homes sold for a median of £256,500 over the past two years, 5% below the Cardiff median. On average 5% of the land within 500 metres of a home postcode is green space — 72% below the Cardiff average.
More comparisons.
Cathays and Plasnewydd next to other wards of Cardiff.