According to data from HM Land Registry, 21, Mostyn Square, Cardiff sits on a plot of 158 m².

We have plot size data on 30 out of 40 other houses in the postcode and 21, Mostyn Square, Cardiff sits on the 16th largest plot.

21, Mostyn Square, Cardiff has an Energy Performance Rating (EPC) of C. This is based on the most recent assessment, dated 25 Jul 2012.

The property is not connected to mains gas and has fully double glazed windows. It is heated using a boiler and radiators (mains gas).

According to HM Land Registry, 21, Mostyn Square, Cardiff was last sold on 14th September 2012 for £215,000 and was recorded as a freehold house.

The property has had 2 sales since 1995.

Since September 2012, the market for similar properties has risen by 82.5%.

• Sold Sep 2012£215,000
• Sold Mar 2009£215,000

According to the Land Registry and our network of Estate Agents, there have been 224 sales of properties similar to 21, Mostyn Square, Cardiff within a radius of 610 metres since 2017.

The most recent example is 13, Watkins Square, Cardiff, CF14 4NH, a freehold house which sold for £375,000 on the 26th March 2026.

Read more about house prices in CF14.

• Sold Mar 2026£375,000 | 4 Bed House13, Watkins Square, Cardiff, CF14 4NH13, Watkins Square, Cardiff, CF14 4NH
• Sold Nov 2025£338,000 | 4 Bed House3, Mostyn Square, Cardiff, CF14 5FE3, Mostyn Square, Cardiff, CF14 5FE
• Sold Nov 2025£335,000 | 4 Bed House205, Tatham Road, Cardiff, CF14 5FF205, Tatham Road, Cardiff, CF14 5FF
• Sold Nov 2025£365,000 | 3 Bed House41, Mostyn Square, Cardiff, CF14 5FE41, Mostyn Square, Cardiff, CF14 5FE
• Sold May 2025£320,000 | 3 Bed House86, Watkins Square, Cardiff, CF14 5FL86, Watkins Square, Cardiff, CF14 5FL
• Sold Mar 2025£350,000 | 3 Bed House128, Watkins Square, Cardiff, CF14 5FL128, Watkins Square, Cardiff, CF14 5FL
• Sold Feb 2025£345,000 | 3 Bed House126, Watkins Square, Cardiff, CF14 5FL126, Watkins Square, Cardiff, CF14 5FL
• Sold May 2024£345,000 | 3 Bed House40, Watkins Square, Cardiff, CF14 5FL40, Watkins Square, Cardiff, CF14 5FL
• Sold Nov 2023£347,000 | 3 Bed House5, Mostyn Square, Cardiff, CF14 5FE5, Mostyn Square, Cardiff, CF14 5FE
• Sold Mar 2023£322,500 | 3 Bed House40, Tasker Square, Cardiff, CF14 5ET40, Tasker Square, Cardiff, CF14 5ET
• Sold Aug 2022£360,000 | 4 Bed House15, Mostyn Square, Cardiff, CF14 5FE15, Mostyn Square, Cardiff, CF14 5FE
• Sold Dec 2021£319,000 | 3 Bed House1, Watkins Square, Cardiff, CF14 4NH1, Watkins Square, Cardiff, CF14 4NH
• Sold Sep 2021£275,000 | 3 Bed House38, Tasker Square, Cardiff, CF14 5ET38, Tasker Square, Cardiff, CF14 5ET
• Sold May 2021£265,000 | 3 Bed House6, Mostyn Square, Cardiff, CF14 5FE6, Mostyn Square, Cardiff, CF14 5FE
• Sold Apr 2021£265,000 | 3 Bed House4, Mostyn Square, Cardiff, CF14 5FE4, Mostyn Square, Cardiff, CF14 5FE
• Sold Aug 2020£283,500 | 3 Bed House4, Watkins Square, Cardiff, CF14 5EQ4, Watkins Square, Cardiff, CF14 5EQ
• Sold Jul 2020£313,000 | 4 Bed House207, Tatham Road, Cardiff, CF14 5FF207, Tatham Road, Cardiff, CF14 5FF
• Sold Dec 2018£245,000 | 3 Bed House14, Mostyn Square, Cardiff, CF14 5FE14, Mostyn Square, Cardiff, CF14 5FE
• Sold Jul 2017£226,500 | 3 Bed House12, Mostyn Square, Cardiff, CF14 5FE12, Mostyn Square, Cardiff, CF14 5FE
• Sold Jan 2017£247,000 | 4 Bed House29, Mostyn Square, Cardiff, CF14 5FE29, Mostyn Square, Cardiff, CF14 5FE

Mostyn Square, Llanishen, Cardiff, CF14 has a total of 41 addresses. According to our analysis of all the public data, 21, Mostyn Square, Cardiff is the 27th largest and the 26th most expensive property on the street.

When compared to the postcode district it is £23k less expensive than the average property in CF14.

• Ty Glas

  |

  300 m away
• Birchgrove

  |

  400 m away
• Rhiwbina

  |

  1.1 km away

According to data from the Environment Agency, the flood risk in this area is considered to be Very Low.