9, Clarence Street, Mountain Ash occupies a 134 m² plot as recorded by HM Land Registry.

Of the 36 other houses in this postcode, 32 have recorded plot sizes, and this one ranks as the 25th largest.

9, Clarence Street, Mountain Ash has an Energy Performance Rating (EPC) of C. This is based on the most recent assessment, dated 14 Feb 2026.

The property is connected to mains gas and has fully double glazed windows. It is heated using a boiler and radiators (mains gas).

9, Clarence Street, Mountain Ash last changed hands on 17th April 2026, selling for £130,000. 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 risen by 62.8% since April 2026.

• Sold Apr 2026£130,000
• Sold Mar 1996£12,500

Land Registry records and our Estate Agent network show 113 sales of comparable properties within 550 metres of 9, Clarence Street, Mountain Ash since 2016.

Most recently, 76, Consort Street, Mountain Ash, CF45 3AU, a freehold house, sold at £130,000 on the 16th December 2025.

Read more about house prices in CF45.

• Sold Dec 2025£130,000 | 4 Bed House76, Consort Street, Mountain Ash, CF45 3AU76, Consort Street, Mountain Ash, CF45 3AU
• Sold Dec 2025£130,000 | 3 Bed House11, Clarence Street, Mountain Ash, CF45 3BB11, Clarence Street, Mountain Ash, CF45 3BB
• 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 Nov 2024£120,000 | 3 Bed House3, Aberpennar Street, Mountain Ash, CF45 3LS3, Aberpennar Street, Mountain Ash, CF45 3LS
• Sold Oct 2024£130,000 | 4 Bed House23, Coplestone Street, Mountain Ash, CF45 3LY23, 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£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

Our analysis of the public data ranks 9, Clarence Street, Mountain Ash as the 4th largest and the 4th most expensive of the 102 addresses on Clarence Street, Mountain Ash, CF45.

Against the CF45 postcode district average, it is £24k less expensive than the typical property.

• Mountain Ash

  |

  600 m away
• Penrhiwceiber

  |

  1.3 km away
• Fernhill

  |

  1.8 km away

Environment Agency data suggests this area has a Very Low risk of flooding.