20, Thomas Street, Mountain Ash has an Energy Performance Rating (EPC) of C. This is based on the most recent assessment, dated 13 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).

Since 2016 44 properties similar to 20, Thomas Street, Mountain Ash have sold within a radius of 610 metres, per the Land Registry and our network of Estate Agents.

The latest, on the 12th January 2026, was 38, Harcourt Terrace, Mountain Ash, CF45 3SD, a freehold house which sold for £97,000.

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 Jul 2025£95,000 | 3 Bed House38, Albert Street, Mountain Ash, CF45 3BA38, Albert Street, Mountain Ash, CF45 3BA
• Sold Jun 2025£66,000 | 3 Bed House40B, Glyngwyn Street, Mountain Ash, CF45 3AF40B, Glyngwyn Street, Mountain Ash, CF45 3AF
• Sold May 2025£101,000 | 3 Bed House40, Arthur Street, Mountain Ash, CF45 3BL40, Arthur Street, Mountain Ash, CF45 3BL
• Sold May 2025£103,000 | 3 Bed House15, Albany Street, Mountain Ash, CF45 3BE15, Albany Street, Mountain Ash, CF45 3BE
• Sold Sep 2024£81,000 | 3 Bed House34, Glyngwyn Street, Mountain Ash, CF45 3AF34, Glyngwyn Street, Mountain Ash, CF45 3AF
• Sold Jul 2024£108,000 | 3 Bed House41, Arthur Street, Mountain Ash, CF45 3BL41, Arthur Street, Mountain Ash, CF45 3BL
• Sold May 2024£62,000 | 3 Bed House89, Victoria Street, Mountain Ash, CF45 3AP89, Victoria Street, Mountain Ash, CF45 3AP
• Sold Dec 2023£90,000 | 3 Bed House19, Mary Street, Mountain Ash, CF45 4HH19, Mary Street, Mountain Ash, CF45 4HH
• Sold Jun 2023£67,000 | 3 Bed House6, Morgan Street, Mountain Ash, CF45 3YN6, Morgan Street, Mountain Ash, CF45 3YN
• Sold Mar 2023£150,000 | 3 Bed House35, Cilhaul Terrace, Mountain Ash, CF45 3ND35, Cilhaul Terrace, Mountain Ash, CF45 3ND
• 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 Nov 2019£79,000 | 3 Bed House14, Harcourt Terrace, Mountain Ash, CF45 3SD14, Harcourt Terrace, Mountain Ash, CF45 3SD
• Sold Feb 2019£70,000 | 3 Bed House57, Clarence Street, Mountain Ash, CF45 3BD57, Clarence Street, Mountain Ash, CF45 3BD
• Sold Oct 2017£45,000 | 3 Bed House41, Thomas Street, Mountain Ash, CF45 3BP41, Thomas Street, Mountain Ash, CF45 3BP
• Sold Oct 2017£70,000 | 3 Bed House34, Albert Street, Mountain Ash, CF45 3BA34, Albert Street, Mountain Ash, CF45 3BA
• Sold Sep 2016£20,000 | 3 Bed House3, Harcourt Terrace, Mountain Ash, CF45 3SD3, Harcourt Terrace, Mountain Ash, CF45 3SD

Of the 73 addresses on Thomas Street, Mountain Ash, CF45, 20, Thomas Street, Mountain Ash comes out as the 68th largest and the 65th most expensive in our analysis of the public data.

It is also £43k less expensive than the average property across the CF45 district.

• Mountain Ash

  |

  800 m away
• Penrhiwceiber

  |

  1.0 km away
• Fernhill

  |

  2.1 km away

The flood risk here is rated Very Low, based on Environment Agency data.