21, Arnold Street, Mountain Ash occupies a 106 m² plot as recorded by HM Land Registry.

Of the 65 other houses in this postcode, 55 have recorded plot sizes, and this one ranks as the 43rd largest.

21, Arnold Street, Mountain Ash has an Energy Performance Rating (EPC) of C. This is based on the most recent assessment, dated 09 Jul 2015.

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

21, Arnold Street, Mountain Ash last changed hands on 28th August 2020, selling for £86,000. 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 38.5% since August 2020.

• Sold Aug 2020£86,000
• Sold Sep 2015£75,000

Land Registry records and our Estate Agent network show 247 sales of comparable properties within 720 metres of 21, Arnold Street, Mountain Ash since 2016.

Most recently, 50, Phillip Street, Mountain Ash, CF45 4BG, a freehold house, sold at £125,000 on the 4th July 2025.

Read more about house prices in CF45.

• Sold Jul 2025£125,000 | 3 Bed House50, Phillip Street, Mountain Ash, CF45 4BG50, Phillip Street, Mountain Ash, CF45 4BG
• Sold Apr 2025£82,600 | 3 Bed House54, Arnold Street, Mountain Ash, CF45 4LF54, Arnold Street, Mountain Ash, CF45 4LF
• Sold Oct 2024£80,000 | 3 Bed House18, Phillip Street, Mountain Ash, CF45 4BE18, Phillip Street, Mountain Ash, CF45 4BE
• Sold Jul 2024£140,000 | 3 Bed House26, Phillip Street, Mountain Ash, CF45 4BE26, Phillip Street, Mountain Ash, CF45 4BE
• Sold May 2024£138,500 | 3 Bed House42, Phillip Street, Mountain Ash, CF45 4BG42, Phillip Street, Mountain Ash, CF45 4BG
• Sold Nov 2023£90,000 | 3 Bed House57, Arnold Street, Mountain Ash, CF45 4LF57, Arnold Street, Mountain Ash, CF45 4LF
• Sold Apr 2023£116,000 | 3 Bed House33, Arnold Street, Mountain Ash, CF45 4LF33, Arnold Street, Mountain Ash, CF45 4LF
• Sold Aug 2022£135,000 | 3 Bed House15, Arnold Street, Mountain Ash, CF45 4LF15, Arnold Street, Mountain Ash, CF45 4LF
• Sold Mar 2022£68,000 | 3 Bed House75, Phillip Street, Mountain Ash, CF45 4BG75, Phillip Street, Mountain Ash, CF45 4BG
• Sold Sep 2021£107,500 | 3 Bed House37, Arnold Street, Mountain Ash, CF45 4LF37, Arnold Street, Mountain Ash, CF45 4LF
• Sold Jun 2021£80,000 | 3 Bed House24, Arnold Street, Mountain Ash, CF45 4LF24, Arnold Street, Mountain Ash, CF45 4LF
• Sold Apr 2021£70,500 | 3 Bed House20, Arnold Street, Mountain Ash, CF45 4LF20, Arnold Street, Mountain Ash, CF45 4LF
• Sold Nov 2020£65,000 | 3 Bed House23, Arnold Street, Mountain Ash, CF45 4LF23, Arnold Street, Mountain Ash, CF45 4LF
• Sold Nov 2020£55,000 | 3 Bed House72, Phillip Street, Mountain Ash, CF45 4BG72, Phillip Street, Mountain Ash, CF45 4BG
• Sold Sep 2020£55,000 | 3 Bed House32, Arnold Street, Mountain Ash, CF45 4LF32, Arnold Street, Mountain Ash, CF45 4LF
• Sold Aug 2020£67,000 | 3 Bed House26, Arnold Street, Mountain Ash, CF45 4LF26, Arnold Street, Mountain Ash, CF45 4LF
• Sold Aug 2020£72,000 | 3 Bed House58, Phillip Street, Mountain Ash, CF45 4BG58, Phillip Street, Mountain Ash, CF45 4BG
• Sold Dec 2019£83,500 | 3 Bed House27, Arnold Street, Mountain Ash, CF45 4LF27, Arnold Street, Mountain Ash, CF45 4LF
• Sold Jul 2019£89,000 | 3 Bed House61, Arnold Street, Mountain Ash, CF45 4LF61, Arnold Street, Mountain Ash, CF45 4LF
• Sold Mar 2016£82,000 | 3 Bed House22, Arnold Street, Mountain Ash, CF45 4LF22, Arnold Street, Mountain Ash, CF45 4LF

Our analysis of the public data ranks 21, Arnold Street, Mountain Ash as the 39th largest and the 39th most expensive of the 65 addresses on Arnold Street, Mountain Ash, CF45.

Against the CF45 postcode district average, it is £38k less expensive than the typical property.

• Mountain Ash

  |

  400 m away
• Fernhill

  |

  1.5 km away
• Penrhiwceiber

  |

  2.0 km away

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