9, Seymour Street, Mountain Ash occupies a 120 m² plot as recorded by HM Land Registry.

Of the 44 other houses in this postcode, 42 have recorded plot sizes, and this one ranks as the 23rd largest.

9, Seymour Street, Mountain Ash has an Energy Performance Rating (EPC) of G. This is based on the most recent assessment, dated 14 Jan 2022.

The property is not connected to mains gas and has single glazed windows. It is heated using no system present: electric heaters assumed.

9, Seymour Street, Mountain Ash last changed hands on 17th February 2023, selling for £171,500. 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 4.5% since February 2023.

• Sold Feb 2023£171,500
• Sold Apr 2015£45,000

Land Registry records and our Estate Agent network show 67 sales of comparable properties within 550 metres of 9, Seymour Street, Mountain Ash since 2014.

Most recently, 8, Hamilton Street, Mountain Ash, CF45 3RH, a freehold house, sold at £177,500 on the 18th June 2026.

Read more about house prices in CF45.

• Sold Jun 2026£177,500 | 4 Bed House8, Hamilton Street, Mountain Ash, CF45 3RH8, Hamilton Street, Mountain Ash, CF45 3RH
• Sold May 2026£150,000 | 3 Bed House12, Beckett Street, Mountain Ash, CF45 4AW12, Beckett Street, Mountain Ash, CF45 4AW
• Sold Feb 2026£160,000 | 3 Bed House10, The Triangle, Mountain Ash, CF45 4BA10, The Triangle, Mountain Ash, CF45 4BA
• Sold Feb 2026£158,000 | 3 Bed House24, Richmond Road, Mountain Ash, CF45 4AN24, Richmond Road, Mountain Ash, CF45 4AN
• Sold Feb 2026£142,500 | 3 Bed HouseAberpennar Cottage, Dover Street, Mountain Ash, CF45 3HYAberpennar Cottage, Dover Street, Mountain Ash, CF45 3HY
• Sold Nov 2024£195,000 | 3 Bed HouseLlyswerfa, Hamilton Street, Mountain Ash, CF45 3RHLlyswerfa, Hamilton Street, Mountain Ash, CF45 3RH
• Sold Jul 2024£137,500 | 3 Bed House1, Hamilton Street, Mountain Ash, CF45 3RH1, Hamilton Street, Mountain Ash, CF45 3RH
• Sold Jun 2024£115,000 | 3 Bed House11, Seymour Street, Mountain Ash, CF45 4BL11, Seymour Street, Mountain Ash, CF45 4BL
• Sold Feb 2024£125,000 | 4 Bed House76, Phillip Street, Mountain Ash, CF45 4BG76, Phillip Street, Mountain Ash, CF45 4BG
• Sold Aug 2023£180,000 | 3 Bed House3, Beckett Street, Mountain Ash, CF45 4AW3, Beckett Street, Mountain Ash, CF45 4AW
• Sold Jul 2023£70,000 | 4 Bed House26, Copley Street, Mountain Ash, CF45 4AS26, Copley Street, Mountain Ash, CF45 4AS
• Sold Feb 2023£110,000 | 3 Bed House62, Arnold Street, Mountain Ash, CF45 4LF62, Arnold Street, Mountain Ash, CF45 4LF
• Sold Sep 2022£120,000 | 4 Bed House14, Phillip Street, Mountain Ash, CF45 4BE14, Phillip Street, Mountain Ash, CF45 4BE
• Sold Apr 2022£93,000 | 4 Bed House10, Darran Road, Mountain Ash, CF45 3HT10, Darran Road, Mountain Ash, CF45 3HT
• Sold Jul 2019£135,000 | 4 Bed House7, Seymour Street, Mountain Ash, CF45 4BL7, Seymour Street, Mountain Ash, CF45 4BL
• Sold Apr 2018£75,000 | 4 Bed House2, Phillip Street, Mountain Ash, CF45 4BE2, Phillip Street, Mountain Ash, CF45 4BE
• Sold Mar 2018£45,500 | 4 Bed House11, Allen Street, Mountain Ash, CF45 4BD11, Allen Street, Mountain Ash, CF45 4BD
• Sold Mar 2017£103,500 | 3 Bed House14, Allen Street, Mountain Ash, CF45 4BD14, Allen Street, Mountain Ash, CF45 4BD
• Sold Jun 2016£89,000 | 3 Bed House29, Phillip Street, Mountain Ash, CF45 4BE29, Phillip Street, Mountain Ash, CF45 4BE
• Sold Nov 2014£86,000 | 5 Bed House69, Phillip Street, Mountain Ash, CF45 4BG69, Phillip Street, Mountain Ash, CF45 4BG

Our analysis of the public data ranks 9, Seymour Street, Mountain Ash as the largest and the most expensive of the 44 addresses on Seymour Street, Mountain Ash, CF45.

Against the CF45 postcode district average, it is £7k less expensive than the typical property.

• Mountain Ash

  |

  400 m away
• Fernhill

  |

  1.3 km away
• Penrhiwceiber

  |

  2.0 km away

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