23, Thomas Street, Mountain Ash occupies a 143 m² plot as recorded by HM Land Registry.

Of the 41 other houses in this postcode, 24 have recorded plot sizes, and this one ranks as the 15th largest.

23, Thomas Street, Mountain Ash has an Energy Performance Rating (EPC) of C. This is based on the most recent assessment, dated 20 Mar 2019.

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

Land Registry records and our Estate Agent network show 117 sales of comparable properties within 620 metres of 23, Thomas Street, Mountain Ash since 2018.

Most recently, 38, Harcourt Terrace, Mountain Ash, CF45 3SD, a freehold house, sold at £97,000 on the 12th January 2026.

Read more about house prices in CF45.

• Sold Jan 2026£97,000 | 3 Bed House38, Harcourt Terrace, Mountain Ash, CF45 3SD38, Harcourt Terrace, Mountain Ash, CF45 3SD
• Sold Oct 2025£125,000 | 3 Bed House9, Arthur Street, Mountain Ash, CF45 3BL9, Arthur Street, Mountain Ash, CF45 3BL
• Sold Jul 2025£95,000 | 3 Bed House38, Albert Street, Mountain Ash, CF45 3BA38, Albert Street, Mountain Ash, CF45 3BA
• Sold May 2025£135,000 | 3 Bed House44, Ty'R Felin Street, Mountain Ash, CF45 3YR44, Ty'R Felin Street, Mountain Ash, CF45 3YR
• Sold May 2025£103,000 | 3 Bed House15, Albany Street, Mountain Ash, CF45 3BE15, Albany Street, Mountain Ash, CF45 3BE
• Sold Apr 2025£72,000 | 3 Bed House16, Albert Street, Mountain Ash, CF45 3BA16, Albert Street, Mountain Ash, CF45 3BA
• Sold Feb 2025£92,750 | 3 Bed House19, Harcourt Terrace, Mountain Ash, CF45 3SD19, Harcourt Terrace, Mountain Ash, CF45 3SD
• Sold Dec 2024£130,000 | 3 Bed House30, Cilhaul Terrace, Mountain Ash, CF45 3ND30, Cilhaul Terrace, Mountain Ash, CF45 3ND
• Sold Jul 2024£75,000 | 3 Bed House12, Hughes Street, Mountain Ash, CF45 3UG12, Hughes Street, Mountain Ash, CF45 3UG
• Sold May 2023£96,950 | 3 Bed House22, Oakland Street, Mountain Ash, CF45 3AL22, Oakland Street, Mountain Ash, CF45 3AL
• Sold Mar 2023£150,000 | 3 Bed House35, Cilhaul Terrace, Mountain Ash, CF45 3ND35, Cilhaul Terrace, Mountain Ash, CF45 3ND
• Sold Sep 2022£105,000 | 3 Bed House3, Hughes Street, Mountain Ash, CF45 3UG3, Hughes Street, Mountain Ash, CF45 3UG
• Sold Jul 2022£115,000 | 3 Bed House24, Edward Street, Mountain Ash, CF45 3AJ24, Edward Street, Mountain Ash, CF45 3AJ
• Sold Jul 2022£93,000 | 3 Bed House18, Oakland Street, Mountain Ash, CF45 3AL18, Oakland Street, Mountain Ash, CF45 3AL
• Sold Feb 2022£95,000 | 3 Bed House28, Thomas Street, Mountain Ash, CF45 3BU28, Thomas Street, Mountain Ash, CF45 3BU
• Sold Jun 2021£70,000 | 3 Bed House2, Consort Street, Mountain Ash, CF45 3AY2, Consort Street, Mountain Ash, CF45 3AY
• Sold May 2021£87,000 | 3 Bed House8, Thomas Street, Mountain Ash, CF45 3BU8, Thomas Street, Mountain Ash, CF45 3BU
• Sold Apr 2021£77,000 | 3 Bed House27, Glancynon Street, Mountain Ash, CF45 3YU27, Glancynon Street, Mountain Ash, CF45 3YU
• Sold Dec 2019£96,000 | 3 Bed House16, Thomas Street, Mountain Ash, CF45 3BU16, Thomas Street, Mountain Ash, CF45 3BU
• Sold Oct 2018£45,000 | 3 Bed House35, Oakland Street, Mountain Ash, CF45 3AL35, Oakland Street, Mountain Ash, CF45 3AL

Our analysis of the public data ranks 23, Thomas Street, Mountain Ash as the 62nd largest and the 58th most expensive of the 73 addresses on Thomas Street, Mountain Ash, CF45.

Against the CF45 postcode district average, it is £37k less expensive than the typical property.

• Mountain Ash

  |

  800 m away
• Penrhiwceiber

  |

  1.0 km away
• Fernhill

  |

  2.1 km away

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