25, Allen Street, Mountain Ash occupies a 55 m² plot as recorded by HM Land Registry.

Of the 32 other houses in this postcode, 28 have recorded plot sizes, and this one ranks as the 27th largest.

25, Allen Street, Mountain Ash has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 23 Mar 2010.

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 252 sales of comparable properties within 620 metres of 25, Allen Street, Mountain Ash since 2016.

Most recently, 59, Arnold Street, Mountain Ash, CF45 4LF, a freehold house, sold at £140,000 on the 17th October 2025.

Read more about house prices in CF45.

• Sold Oct 2025£140,000 | 3 Bed House59, Arnold Street, Mountain Ash, CF45 4LF59, Arnold Street, Mountain Ash, CF45 4LF
• Sold Jul 2025£115,000 | 3 Bed House13, London Street, Mountain Ash, CF45 4BN13, London Street, Mountain Ash, CF45 4BN
• 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 Sep 2024£85,000 | 3 Bed House42, Allen Street, Mountain Ash, CF45 4BB42, Allen Street, Mountain Ash, CF45 4BB
• Sold Jul 2024£140,000 | 3 Bed House26, Phillip Street, Mountain Ash, CF45 4BE26, Phillip Street, Mountain Ash, CF45 4BE
• Sold Jan 2024£105,000 | 3 Bed House12, Phillip Street, Mountain Ash, CF45 4BE12, Phillip Street, Mountain Ash, CF45 4BE
• Sold Aug 2023£115,000 | 3 Bed House47, Allen Street, Mountain Ash, CF45 4BB47, Allen Street, Mountain Ash, CF45 4BB
• Sold Jun 2023£117,500 | 3 Bed House21, Copley Street, Mountain Ash, CF45 4AS21, Copley Street, Mountain Ash, CF45 4AS
• Sold Aug 2022£90,000 | 3 Bed House37, Allen Street, Mountain Ash, CF45 4BB37, Allen Street, Mountain Ash, CF45 4BB
• Sold Jul 2022£135,000 | 3 Bed House17, Allen Street, Mountain Ash, CF45 4BD17, Allen Street, Mountain Ash, CF45 4BD
• Sold Jun 2022£129,995 | 3 Bed House4, Copley Street, Mountain Ash, CF45 4AS4, Copley Street, Mountain Ash, CF45 4AS
• Sold Mar 2022£115,000 | 3 Bed House56, Phillip Street, Mountain Ash, CF45 4BG56, Phillip Street, Mountain Ash, CF45 4BG
• Sold Feb 2022£127,000 | 3 Bed House14, Copley Street, Mountain Ash, CF45 4AS14, Copley Street, Mountain Ash, CF45 4AS
• Sold Jun 2021£120,000 | 3 Bed House4, Phillip Street, Mountain Ash, CF45 4BE4, Phillip Street, Mountain Ash, CF45 4BE
• Sold Mar 2021£65,000 | 3 Bed House23, Phillip Street, Mountain Ash, CF45 4BE23, Phillip Street, Mountain Ash, CF45 4BE
• Sold Aug 2020£72,000 | 3 Bed House58, Phillip Street, Mountain Ash, CF45 4BG58, Phillip Street, Mountain Ash, CF45 4BG
• Sold Jul 2019£90,000 | 3 Bed House27, Copley Street, Mountain Ash, CF45 4AS27, Copley Street, Mountain Ash, CF45 4AS
• Sold Nov 2016£60,000 | 3 Bed House20, Allen Street, Mountain Ash, CF45 4BD20, Allen Street, Mountain Ash, CF45 4BD

Our analysis of the public data ranks 25, Allen Street, Mountain Ash as the 34th largest and the 40th most expensive of the 63 addresses on Allen Street, Mountain Ash, CF45.

Against the CF45 postcode district average, it is £28k less expensive than the typical property.

• Mountain Ash

  |

  400 m away
• Fernhill

  |

  1.2 km away
• Penrhiwceiber

  |

  2.1 km away

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