Detached
£459,225
43% above the Thornhill average
23.1% of sales
What is the average house price in Thornhill? £320,883
The average house price in Thornhill is £320,883, based on 105 homes sold in the 12 months to September 2026. Prices are up 9.9% (£29,013) on a year earlier.
- 1 year change
- +9.9%
- Sold in 12 months
- 105
- Data up to
- September 2026
Sold prices from HM Land Registry, not asking prices. How we calculate this
How much does each type of property cost in Thornhill?
Average sold price by property type, and each type's share of recent sales.
Semi-detached
£292,463
9% below the Thornhill average
29.8% of sales
Terraced
£258,132
20% below the Thornhill average
40.5% of sales
Flats
£178,714
44% below the Thornhill average
6.6% of sales
Are house prices in Thornhill going up or down?
House prices in Thornhill are rising: up 9.9% (£29,013) over the past year. Over the past 10 years, prices are up 44.3% (£98,435).
Past 12 months
+9.9%
+£29,013From £291,870 to £320,883
£320,883£291,870
Past 10 years
+44.3%
+£98,435From £222,448 to £320,883
£320,883£222,448
Quick answers for Thornhill
9 key facts at a glance.
When did prices peak?
£422,166
Highest average, reached in January 2023
How many homes sold?
105
Recorded so far for the 12 months to September 2026
What sells most often?
Terraced houses
40.5% of recent sales
What is the most common price range?
£200k - £300k
43.8% of sales
How many people live in Thornhill?
6,833
10,634 people per square mile · Very High (Census 2021)
Population density is Very High, on a scale from Very Low to Very High.
Usual residents, including communal establishments.
How many households are in Thornhill?
3,078
4,790 households per square mile · Very High (Census 2021)
Household density is Very High, on a scale from Very Low to Very High.
Occupied households, not communal establishments.
How much green space is in Thornhill?
39 m² per resident
More green space per resident than 63% of areas in England and Wales. That's about 5.4 football pitches for every 1,000 residents.
15.9% of the area · 5 public parks. Parks, playing fields, allotments and other public green space, not counting golf courses. Contains OS data © Crown copyright and database right 2026.
What is the crime rate in Thornhill?
21 crimes per 1,000 residents
Very Low · −13.4% on the previous year · 12 months to September 2026
Crime rate is Very Low, on a scale from Very Low to Very High.
Contains public sector information licensed under the Open Government Licence v3.0. Source: police.uk.
How does Thornhill rank?
16th most expensive area of Cardiff.
Compared with 36 areas
What are the most expensive homes sold in Thornhill?
The highest recorded sale prices in Thornhill, from HM Land Registry.
How do house prices in Thornhill compare with nearby areas?
Thornhill compared with the 6 nearest other areas in Cardiff.
Thornhill vs Lisvane
- Thornhill
- £320,883
- Lisvane
- £627,494+£306,611
Open comparison
Thornhill vs Llanishen
- Thornhill
- £320,883
- Llanishen
- £313,434−£7,449
Open comparison
Thornhill vs Rhiwbina
- Thornhill
- £320,883
- Rhiwbina
- £403,334+£82,451
Open comparison
Thornhill vs Heath
- Thornhill
- £320,883
- Heath
- £357,681+£36,798
Open comparison
Thornhill vs Cyncoed
- Thornhill
- £320,883
- Cyncoed
- £536,344+£215,461
Open comparison
Thornhill vs Tongwynlais
- Thornhill
- £320,883
- Tongwynlais
- £361,435+£40,552
Open comparison
Thinking of buying in Thornhill?
There's a lot to think about. Whether it's a home to live in or a buy-to-let, our free checklist walks you through what to check before you make an offer.
What to check before you buyWhere does this data come from?
Price information is from HM Land Registry, location boundaries are from OpenStreetMap, and households and population are from Nomis Census 2021 postcode estimates (21 March 2021). Parks and green space are from OS Open Greenspace. Contains OS data © Crown copyright and database right 2026. Crime is from police.uk street-level data. Contains public sector information licensed under the Open Government Licence v3.0. Source: police.uk.
Last updated 6 November 2026 at 00:25 with the latest Land Registry data (September 2026). The Thornhill dataset covers 278 postcodes.
Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0.
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