9, James Street, Mountain Ash occupies a 121 m² plot as recorded by HM Land Registry.

All 17 other houses in this postcode have recorded plot sizes, and this one ranks as the 5th largest.

9, James Street, Mountain Ash has an Energy Performance Rating (EPC) of E. This is based on the most recent assessment, dated 11 May 2026.

The property is connected to mains gas and has mostly double glazing. It is heated using a boiler and radiators (mains gas).

Land Registry records and our Estate Agent network show 202 sales of comparable properties within 600 metres of 9, James Street, Mountain Ash since 2020.

Most recently, 70, Clarence Street, Mountain Ash, CF45 3BD, a freehold house, sold at £135,000 on the 20th March 2026.

Read more about house prices in CF45.

• Sold Mar 2026£135,000 | 3 Bed House70, Clarence Street, Mountain Ash, CF45 3BD70, Clarence Street, Mountain Ash, CF45 3BD
• Sold Nov 2025£65,000 | 3 Bed House110, Woodfield Terrace, Mountain Ash, CF45 3UT110, Woodfield Terrace, Mountain Ash, CF45 3UT
• Sold Oct 2025£112,000 | 3 Bed House32, Oakland Street, Mountain Ash, CF45 3AL32, Oakland Street, Mountain Ash, CF45 3AL
• Sold Sep 2025£116,500 | 3 Bed House20, Ty'R Felin Street, Mountain Ash, CF45 3YR20, Ty'R Felin Street, Mountain Ash, CF45 3YR
• Sold Jun 2025£90,000 | 3 Bed House26, Mount Pleasant Terrace, Mountain Ash, CF45 3AN26, Mount Pleasant Terrace, Mountain Ash, CF45 3AN
• Sold Jun 2025£98,000 | 3 Bed House96, Clarence Street, Mountain Ash, CF45 3BD96, Clarence Street, Mountain Ash, CF45 3BD
• Sold Feb 2025£99,950 | 3 Bed House7, Albany Street, Mountain Ash, CF45 3BE7, Albany Street, Mountain Ash, CF45 3BE
• Sold Jan 2025£95,000 | 3 Bed House47, Albert Street, Mountain Ash, CF45 3BA47, Albert Street, Mountain Ash, CF45 3BA
• Sold Jul 2024£108,000 | 3 Bed House123, Woodfield Terrace, Mountain Ash, CF45 3UT123, Woodfield Terrace, Mountain Ash, CF45 3UT
• Sold Jun 2024£115,000 | 3 Bed House64, Clarence Street, Mountain Ash, CF45 3BD64, Clarence Street, Mountain Ash, CF45 3BD
• Sold Jan 2024£83,000 | 3 Bed House38, Ty'R Felin Street, Mountain Ash, CF45 3YR38, Ty'R Felin Street, Mountain Ash, CF45 3YR
• Sold Nov 2023£110,000 | 3 Bed House187, Penrhiwceiber Road, Mountain Ash, CF45 3SG187, Penrhiwceiber Road, Mountain Ash, CF45 3SG
• Sold Sep 2023£119,950 | 3 Bed House2, James Street, Mountain Ash, CF45 3UH2, James Street, Mountain Ash, CF45 3UH
• Sold Aug 2023£105,000 | 3 Bed House28, Ty'R Felin Street, Mountain Ash, CF45 3YR28, Ty'R Felin Street, Mountain Ash, CF45 3YR
• Sold Feb 2022£130,000 | 3 Bed House32, Mount Pleasant Terrace, Mountain Ash, CF45 3AN32, Mount Pleasant Terrace, Mountain Ash, CF45 3AN
• Sold Nov 2021£122,500 | 3 Bed House15, Hughes Street, Mountain Ash, CF45 3UG15, Hughes Street, Mountain Ash, CF45 3UG
• Sold Mar 2021£84,950 | 3 Bed House27, Mount Pleasant Terrace, Mountain Ash, CF45 3AN27, Mount Pleasant Terrace, Mountain Ash, CF45 3AN
• Sold Feb 2021£60,000 | 3 Bed House21, Mount Pleasant Terrace, Mountain Ash, CF45 3AN21, Mount Pleasant Terrace, Mountain Ash, CF45 3AN
• Sold May 2020£75,000 | 3 Bed HouseCynon View A, Glyngwyn Street, Mountain Ash, CF45 3AFCynon View A, Glyngwyn Street, Mountain Ash, CF45 3AF
• Sold Apr 2020£85,000 | 3 Bed House11, Hughes Street, Mountain Ash, CF45 3UG11, Hughes Street, Mountain Ash, CF45 3UG

Our analysis of the public data ranks 9, James Street, Mountain Ash as the 4th largest and the 4th most expensive of the 17 addresses on James Street, Mountain Ash, CF45.

Against the CF45 postcode district average, it is £48k less expensive than the typical property.

• Mountain Ash

  |

  800 m away
• Penrhiwceiber

  |

  900 m away
• Fernhill

  |

  2.1 km away

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