According to data from HM Land Registry, 11, Clarence Street, Mountain Ash sits on a plot of 136 m².

We have plot size data on 32 out of 36 other houses in the postcode and 11, Clarence Street, Mountain Ash sits on the 19th largest plot.

11, Clarence Street, Mountain Ash has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 11 Feb 2025.

The property is 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, 11, Clarence Street, Mountain Ash was last sold on 5th December 2025 for £130,000 and was recorded as a freehold house.

The property has had 4 sales since 1995.

Since December 2025, the market for similar properties has risen by 25.4%.

• Sold Dec 2025£130,000
• Sold May 2015£88,000
• Sold Jun 2010£75,000

According to the Land Registry and our network of Estate Agents, there have been 130 sales of properties similar to 11, Clarence Street, Mountain Ash within a radius of 550 metres since 2016.

The most recent example is 9, Clarence Street, Mountain Ash, CF45 3BB, a freehold house which sold for £130,000 on the 17th April 2026.

Read more about house prices in CF45.

• Sold Apr 2026£130,000 | 4 Bed House9, Clarence Street, Mountain Ash, CF45 3BB9, Clarence Street, Mountain Ash, CF45 3BB
• Sold Dec 2025£130,000 | 4 Bed House76, Consort Street, Mountain Ash, CF45 3AU76, Consort Street, Mountain Ash, CF45 3AU
• Sold Sep 2025£130,000 | 3 Bed House14, Oakland Street, Mountain Ash, CF45 3AL14, Oakland Street, Mountain Ash, CF45 3AL
• Sold Jul 2025£145,000 | 3 Bed House42, Coplestone Street, Mountain Ash, CF45 3LY42, Coplestone Street, Mountain Ash, CF45 3LY
• Sold Jun 2025£98,000 | 3 Bed House96, Clarence Street, Mountain Ash, CF45 3BD96, Clarence Street, Mountain Ash, CF45 3BD
• Sold May 2025£116,500 | 3 Bed House17, Coplestone Street, Mountain Ash, CF45 3LY17, Coplestone Street, Mountain Ash, CF45 3LY
• Sold Mar 2025£76,000 | 3 Bed House1, Glyngwyn Street, Mountain Ash, CF45 3AF1, Glyngwyn Street, Mountain Ash, CF45 3AF
• Sold Feb 2025£100,000 | 3 Bed House10, Coplestone Street, Mountain Ash, CF45 3LY10, Coplestone Street, Mountain Ash, CF45 3LY
• Sold Feb 2025£73,000 | 3 Bed House4, Coplestone Street, Mountain Ash, CF45 3LY4, Coplestone Street, Mountain Ash, CF45 3LY
• Sold Feb 2024£112,500 | 3 Bed House12, Coplestone Street, Mountain Ash, CF45 3LY12, Coplestone Street, Mountain Ash, CF45 3LY
• Sold May 2023£85,000 | 3 Bed House43, Bailey Street, Mountain Ash, CF45 3AS43, Bailey Street, Mountain Ash, CF45 3AS
• Sold May 2023£115,000 | 3 Bed House40, Oakland Street, Mountain Ash, CF45 3AL40, Oakland Street, Mountain Ash, CF45 3AL
• Sold Dec 2022£95,000 | 4 Bed House72, Consort Street, Mountain Ash, CF45 3AU72, Consort Street, Mountain Ash, CF45 3AU
• Sold Dec 2021£140,000 | 4 Bed House2, Albert Street, Mountain Ash, CF45 3BA2, Albert Street, Mountain Ash, CF45 3BA
• Sold Oct 2021£105,000 | 3 Bed House16, Consort Street, Mountain Ash, CF45 3AY16, Consort Street, Mountain Ash, CF45 3AY
• Sold Oct 2021£90,000 | 3 Bed House36, Clarence Street, Mountain Ash, CF45 3BB36, Clarence Street, Mountain Ash, CF45 3BB
• Sold Oct 2021£102,000 | 3 Bed House65, Consort Street, Mountain Ash, CF45 3AU65, Consort Street, Mountain Ash, CF45 3AU
• Sold Jul 2021£105,000 | 4 Bed House23, Mount Pleasant Terrace, Mountain Ash, CF45 3AN23, Mount Pleasant Terrace, Mountain Ash, CF45 3AN
• Sold Feb 2019£82,500 | 3 Bed House30, Consort Street, Mountain Ash, CF45 3AY30, Consort Street, Mountain Ash, CF45 3AY
• Sold Jul 2016£75,000 | 3 Bed House14, Albert Street, Mountain Ash, CF45 3BA14, Albert Street, Mountain Ash, CF45 3BA

Clarence Street, Mountain Ash, CF45 has a total of 102 addresses. According to our analysis of all the public data, 11, Clarence Street, Mountain Ash is the 6th largest and the 11th most expensive property on the street.

When compared to the postcode district it is £29k less expensive than the average property in CF45.

• Mountain Ash

  |

  600 m away
• Penrhiwceiber

  |

  1.3 km away
• Fernhill

  |

  1.8 km away

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