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England and Wales / Cymru Wales / South Glamorgan / Cardiff / Old St. Mellons

What is the average house price in Old St. Mellons?
£325,598

Average price per property type

Detached house illustration

Detached

£485,544

Semi-detached house illustration

Semi-Detached

£281,751

Terraced house illustration

Terraced

£244,184

Flats illustration

Flats

£171,062

Are prices going up or down?

Short term 📉

Prices decreased by £1,014 (0.31%) over the past year

AUG 2025JUL 2026

Long term 📉

Prices decreased by £5,366 (1.62%) over the past 10 years

JUL 2016JUL 2026

Quick answers for Old St. Mellons

5 key facts at a glance.

Most expensive houses in Old St. Mellons

The five highest recorded property sales in Old St. Mellons.

View all expensive houses

How do house prices in Old St. Mellons compare with nearby areas?

Old St. Mellons compared with the 6 nearest other areas in Cardiff.

Old St. Mellons vs Pontprennau

Old St. Mellons
£325,598
Pontprennau
£308,023−£17,575

Open comparison

Old St. Mellons vs Llanrumney

Old St. Mellons
£325,598
Llanrumney
£226,178−£99,420

Open comparison

Old St. Mellons vs Pentwyn

Old St. Mellons
£325,598
Pentwyn
£230,366−£95,232

Open comparison

Old St. Mellons vs Rumney

Old St. Mellons
£325,598
Rumney
£246,825−£78,773

Open comparison

Old St. Mellons vs Trowbridge

Old St. Mellons
£325,598
Trowbridge
£240,569−£85,029

Open comparison

Old St. Mellons vs Llanedeyrn

Old St. Mellons
£325,598
Llanedeyrn
£182,916−£142,682

Open comparison

Compare Old St. Mellons with a different area

Data sources

Location boundary data sourced from OpenStreetMap and price information is from HM Land Registry

Last updated at 15 September 2026 at 10:22 with the latest Land Registry data (July 2026). The Old St. Mellons dataset covers 134 postcodes.

Read our full data methodology

Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0.

About·Data methodology