Our Data Sources
21 St. James Mansions, Cardiff has 21 entries in the Land Registry, most recently in February 2008 and a single entry in the EPC database dated March 2021.
We combine this information with that of neighbouring properties to estimate the property attributes and values.
The local information is scored as 3 out of 5 and is considered of medium accuracy.
1Sales dated prior to 2007 are shown, but are not used in our calculations.
Price Range & Condition
Decorative condition can have a big effect on a property's value and this effect varies depending on the type, size and location of the property.
If 21 St. James Mansions, Cardiff is in very good condition we estimate a sale value of £156,521 and a rental value of £1,101 per month.
However, if the property needs a lot of cosmetic work we estimate a sale value of £138,633 and a rental value of £976 per month.
Energy Efficiency
21 St. James Mansions, Cardiff has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 18 Mar 2021.
The property is not connected to mains gas and has fully double glazed windows. It is heated using room heaters (electric).
Sold Prices
According to HM Land Registry, 21 St. James Mansions, Cardiff was last sold on 29th February 2008 for £147,500 and was recorded as a leasehold flat.
The property has had 2 sales since 1995.
Since February 2008, the market for similar properties has dropped by 2.6%.
- Sold Feb 2008£147,500
- Sold Jun 2002£148,000
Similar Properties Sold Nearby
According to the Land Registry and our network of Estate Agents, there have been 136 sales of properties similar to 21 St. James Mansions, Cardiff within a radius of 340 metres since 2018.
The most recent example is 48, Lynton Court, Cardiff, CF10 5NF, a leasehold flat which sold for £130,000 on the 5th December 2025.
Read more about house prices in CF10.
- Sold Dec 2025£130,000 | 2 Bed Flat48, Lynton Court, Cardiff, CF10 5NF48, Lynton Court, Cardiff, CF10 5NF
- Sold Nov 2025£145,000 | 2 Bed Flat4, Burt Place, Cardiff, CF10 5HS4, Burt Place, Cardiff, CF10 5HS
- Sold Nov 2025£182,500 | 2 Bed Flat42, Harrowby Street, Cardiff, CF10 5GA42, Harrowby Street, Cardiff, CF10 5GA
- Sold Jun 2025£138,000 | 2 Bed Flat22, Judkin Court, Cardiff, CF10 5AU22, Judkin Court, Cardiff, CF10 5AU
- Sold Jun 2025£150,000 | 2 Bed Flat2, Burt Place, Cardiff, CF10 5HS2, Burt Place, Cardiff, CF10 5HS
Nearby is defined as the radius comprising the nearest 2,000 addresses.
More reading links
Explore Nearby Properties
The surrounding properties have an average estimated value of £129,727, ranging from £108,466 to £162,983.
- 4 St. James Mansions Mount Stuart Square
2 Bed Flat | 0 m | Est. Value: £128,022
- 16 St. James Mansions Mount Stuart Square
2 Bed Flat | 0 m | Est. Value: £132,961
- 14 St. James Mansions Mount Stuart Square
3 Bed Flat | 0 m | Est. Value: £162,983
- 18 St. James Mansions Mount Stuart Square
1 Bed Flat | 0 m | Est. Value: £114,607
- 10 St. James Mansions Mount Stuart Square
2 Bed Flat | 0 m | Est. Value: £138,594
Location Comparison
Mount Stuart Square, Cardiff, CF10 has a total of 222 addresses. According to our analysis of all the public data, 21 St. James Mansions, Cardiff is the 64th largest and the 174th most expensive property on the street.
When compared to the postcode district it is £42k less expensive than the average property in CF10.
More reading links
Schools Nearby
Public Transport Nearby
- Cardiff Bay|200 m away
- Cardiff Central|1.4 km away
- Grangetown (Cardiff)|1.4 km away
Available Internet Speeds
According to recent data from Ofcom, Superfast Broadband is available in this area.
According to recent data from Ofcom, Superfast Broadband available in this area.
Risk of Flooding
According to data from the Environment Agency, the flood risk in this area is considered to be Very Low.
