Our Data Sources
21, Heol Williams, Cardiff has 2 entries in the Land Registry , most recently in November 2025 and a single entry in the EPC database dated December 2018.
We combine this information with that of neighbouring properties to estimate the property attributes and values.
The local information is scored as 5 out of 5 and is considered of high accuracy.
Price Range & Condition
In very good condition, we estimate 21, Heol Williams, Cardiff would be worth £281,438, with a potential rental value of £1,464 per month.
If substantial cosmetic improvements are needed, the estimated sale value falls to £249,274, with a rental value of £1,296 per month.
The extent to which decoration affects a property's value depends on its type, size and location.
Plot Size
21, Heol Williams, Cardiff occupies a 143 m2 plot as recorded by HM Land Registry.
Of the 58 other houses in this postcode, 56 have recorded plot sizes, and this one ranks as the 31st largest.
Energy Efficiency
21, Heol Williams, Cardiff has an Energy Performance Rating (EPC) of B. This is based on the most recent assessment, dated 12 Dec 2018.
The property is not connected to mains gas and has high performance glazing. It is heated using Boiler and radiators, mains gas.
Sold Prices
21, Heol Williams, Cardiff last changed hands on 28th November 2025, selling for £255,000. The transaction was logged as a freehold house by HM Land Registry.
In total it has sold twice since 1995.
The market for similar properties has dropped by 20.4% since November 2025.
- Sold Nov 2025£255,000
- Sold Dec 2018£219,995
Similar Properties Sold Nearby
Land Registry records and our Estate Agent network show 234 sales of comparable properties within 750 metres of 21, Heol Williams, Cardiff across the last 2 years.
Most recently, 3, Ffordd Crabtree, Cardiff, CF3 6AN, a freehold house, sold at £280,000 on the 30th March 2026.
Read more about house prices in CF3.
- Sold Mar 2026£280,000 | 3 Bed House3, Ffordd Crabtree, Cardiff, CF3 6AN3, Ffordd Crabtree, Cardiff, CF3 6AN
- Sold Jan 2026£250,000 | 3 Bed House52, Heol Williams, Cardiff, CF3 6AQ52, Heol Williams, Cardiff, CF3 6AQ
- Sold Jan 2025£285,000 | 3 Bed House40, Heol Williams, Cardiff, CF3 6AQ40, Heol Williams, Cardiff, CF3 6AQ
•Nearby is defined as the radius comprising the nearest 2,000 addresses.
More reading links
Location Comparison
Our analysis of the public data ranks 21, Heol Williams, Cardiff as the 35th largest and the 33rd most expensive of the 58 addresses on Heol Williams, Old St. Mellons, Cardiff, CF3.
Against the CF3 postcode district average, it is £10k more expensive than the typical property.
More reading links
Schools Nearby
Public Transport Nearby
- Llanishen|4.1 km away
- Lisvane & Thornhill|4.4 km away
- Heath High Level|4.6 km away
Risk of Flooding
Environment Agency data suggests this area has a Very Low risk of flooding.
