21, Arthur Street, Mountain Ash occupies a 164 m² plot as recorded by HM Land Registry.

Of the 51 other houses in this postcode, 46 have recorded plot sizes, and this one ranks as the 14th largest.

21, Arthur Street, Mountain Ash has an Energy Performance Rating (EPC) of C. This is based on the most recent assessment, dated 03 Oct 2022.

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 234 sales of comparable properties within 690 metres of 21, Arthur Street, Mountain Ash since 2017.

Most recently, 13, Hughes Street, Mountain Ash, CF45 3UG, a freehold house, sold at £122,000 on the 28th November 2025.

Read more about house prices in CF45.

• Sold Nov 2025£122,000 | 3 Bed House13, Hughes Street, Mountain Ash, CF45 3UG13, Hughes Street, Mountain Ash, CF45 3UG
• Sold Oct 2025£125,000 | 3 Bed House9, Arthur Street, Mountain Ash, CF45 3BL9, Arthur Street, Mountain Ash, CF45 3BL
• Sold Sep 2025£125,000 | 3 Bed House26, Albany Street, Mountain Ash, CF45 3BE26, Albany Street, Mountain Ash, CF45 3BE
• Sold Jun 2025£90,000 | 3 Bed House26, Mount Pleasant Terrace, Mountain Ash, CF45 3AN26, Mount Pleasant Terrace, Mountain Ash, CF45 3AN
• Sold May 2025£101,000 | 3 Bed House40, Arthur Street, Mountain Ash, CF45 3BL40, Arthur Street, Mountain Ash, CF45 3BL
• 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£118,000 | 3 Bed House11, Albany Street, Mountain Ash, CF45 3BE11, Albany Street, Mountain Ash, CF45 3BE
• Sold Feb 2025£99,950 | 3 Bed House7, Albany Street, Mountain Ash, CF45 3BE7, Albany Street, Mountain Ash, CF45 3BE
• Sold Nov 2024£120,000 | 3 Bed House22, Albany Street, Mountain Ash, CF45 3BE22, Albany Street, Mountain Ash, CF45 3BE
• Sold Jul 2024£75,000 | 3 Bed House12, Hughes Street, Mountain Ash, CF45 3UG12, Hughes Street, Mountain Ash, CF45 3UG
• Sold Jul 2024£108,000 | 3 Bed House41, Arthur Street, Mountain Ash, CF45 3BL41, Arthur Street, Mountain Ash, CF45 3BL
• Sold Sep 2023£92,500 | 3 Bed House5, Albany Street, Mountain Ash, CF45 3BE5, Albany Street, Mountain Ash, CF45 3BE
• Sold Jul 2023£118,000 | 3 Bed House25, Mount Pleasant Terrace, Mountain Ash, CF45 3AN25, Mount Pleasant Terrace, Mountain Ash, CF45 3AN
• Sold Jun 2023£68,000 | 3 Bed House8, Albany Street, Mountain Ash, CF45 3BE8, Albany Street, Mountain Ash, CF45 3BE
• Sold Apr 2023£86,000 | 3 Bed House44, Arthur Street, Mountain Ash, CF45 3BL44, Arthur Street, Mountain Ash, CF45 3BL
• Sold Oct 2019£80,000 | 3 Bed House16, Albany Street, Mountain Ash, CF45 3BE16, Albany Street, Mountain Ash, CF45 3BE
• Sold Sep 2019£39,000 | 3 Bed House34, Arthur Street, Mountain Ash, CF45 3BL34, Arthur Street, Mountain Ash, CF45 3BL
• Sold Jul 2019£750 | 3 Bed House6, Irene Street, Mountain Ash, CF45 3BN6, Irene Street, Mountain Ash, CF45 3BN
• Sold Jul 2017£39,500 | 3 Bed House38, Arthur Street, Mountain Ash, CF45 3BL38, Arthur Street, Mountain Ash, CF45 3BL

Our analysis of the public data ranks 21, Arthur Street, Mountain Ash as the 19th largest and the 20th most expensive of the 51 addresses on Arthur Street, Mountain Ash, CF45.

Against the CF45 postcode district average, it is £53k less expensive than the typical property.

• Mountain Ash

  |

  1.0 km away
• Penrhiwceiber

  |

  1.1 km away
• Fernhill

  |

  2.1 km away

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