A locality in Cardiff.
Sold house prices in Old St Mellons have an overall average of £290,996, based on all 1,794 residential sales on record — drawn from every recorded UK house sale.
Medians over the most recent 12 months of all UK property sales (to July 2026). Median is used, not mean — it isn't skewed by the odd very-high sale.
Across Old St Mellons, the median sold price over the 12 months to July 2026 was £289,950 — it fell 3.3% on the year before. That reflects 92 recorded sales. Detached homes are the priciest at a median of £406,750, while flat/maisonette homes are the most affordable at £180,000. Over the past year, other homes moved the most (-78.7%). New-build homes were 0% of recent sales, a share that is falling.
These figures track the median of prices actually paid, not a like-for-like index. A move can reflect a change in what sold — more new homes, or a different mix of house types and sizes — as much as any change in what a given home is worth.
| Type | Median | 12-month change | Sales |
|---|---|---|---|
| Semi-detached | £285,500 | -2.2% | 32 |
| Detached | £406,750 | +0.4% | 30 |
| Terraced | £257,500 | +3% | 22 |
| Flat/Maisonette | £180,000 | +6.2% | 7 |
| Other | £298,500 | -78.7% | 1 |
Change compares the median for the last 12 months with the 12 months before.
New-build homes were 0% of sales in the latest year, and the share is ▼ falling over the period — a marker of how much new housing is being built here (not a price forecast). See the new-build chart above.
How these figures are calculated. Year-on-year change compares the median sold price over the most recent 12 months of data with the 12 months before it. We use the median, not the average, so a few unusually high or low sales don't distort it. Because HM Land Registry data lags — sales take time to be registered — the most recent month or two are provisional and tend to revise upward. Figures track the mix of what actually sold, so they are not a like-for-like index. The same method is used across this site, so an area's figure here matches its ranking in investment trends.
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Estate agency businesses registered in Old St Mellons (Companies House).