HM Land Registry records the plot of land for 27, Allen Street, Mountain Ash as measuring 130 m².

That makes it the 6th largest plot in the postcode, where 28 of the 32 other houses have recorded plot data.

27, Allen Street, Mountain Ash has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 24 May 2021.

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

The most recent sale of 27, Allen Street, Mountain Ash completed on 14th November 2002 at £28,000 and was recorded by HM Land Registry as a freehold house.

Since 1995 the property has sold twice.

• Sold Nov 2002£28,000
• Sold Mar 1998£14,500

Since 2015 182 properties similar to 27, Allen Street, Mountain Ash have sold within a radius of 620 metres, per the Land Registry and our network of Estate Agents.

The latest, on the 8th May 2026, was 12, Beckett Street, Mountain Ash, CF45 4AW, a freehold house which sold for £150,000.

Read more about house prices in CF45.

• Sold May 2026£150,000 | 3 Bed House12, Beckett Street, Mountain Ash, CF45 4AW12, Beckett Street, Mountain Ash, CF45 4AW
• Sold Feb 2026£142,500 | 3 Bed HouseAberpennar Cottage, Dover Street, Mountain Ash, CF45 3HYAberpennar Cottage, Dover Street, Mountain Ash, CF45 3HY
• Sold Oct 2025£140,000 | 3 Bed House59, Arnold Street, Mountain Ash, CF45 4LF59, Arnold Street, Mountain Ash, CF45 4LF
• Sold Aug 2025£126,000 | 3 Bed House19, Beckett Street, Mountain Ash, CF45 4AW19, Beckett Street, Mountain Ash, CF45 4AW
• Sold Oct 2024£148,500 | 3 Bed House33, Phillip Street, Mountain Ash, CF45 4BE33, Phillip Street, Mountain Ash, CF45 4BE
• Sold Jun 2024£115,000 | 3 Bed House11, Seymour Street, Mountain Ash, CF45 4BL11, Seymour Street, Mountain Ash, CF45 4BL
• Sold May 2024£143,000 | 3 Bed House8, Copley Street, Mountain Ash, CF45 4AS8, Copley Street, Mountain Ash, CF45 4AS
• Sold Jan 2024£105,000 | 3 Bed House12, Phillip Street, Mountain Ash, CF45 4BE12, Phillip Street, Mountain Ash, CF45 4BE
• Sold Feb 2023£110,000 | 3 Bed House62, Arnold Street, Mountain Ash, CF45 4LF62, Arnold Street, Mountain Ash, CF45 4LF
• 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 May 2021£109,000 | 3 Bed House30, Phillip Street, Mountain Ash, CF45 4BE30, Phillip Street, Mountain Ash, CF45 4BE
• Sold Oct 2020£90,000 | 3 Bed House11, Arnold Street, Mountain Ash, CF45 4LF11, Arnold Street, Mountain Ash, CF45 4LF
• Sold Jul 2020£112,000 | 3 Bed House51, Phillip Street, Mountain Ash, CF45 4BG51, Phillip Street, Mountain Ash, CF45 4BG
• Sold May 2020£102,000 | 3 Bed House17, Beckett Street, Mountain Ash, CF45 4AW17, Beckett Street, Mountain Ash, CF45 4AW
• Sold Mar 2020£85,000 | 3 Bed House13, Phillip Street, Mountain Ash, CF45 4BE13, Phillip Street, Mountain Ash, CF45 4BE
• Sold Nov 2019£108,000 | 3 Bed House3, Copley Street, Mountain Ash, CF45 4AS3, Copley Street, Mountain Ash, CF45 4AS
• Sold Jul 2019£90,000 | 3 Bed House27, Copley Street, Mountain Ash, CF45 4AS27, Copley Street, Mountain Ash, CF45 4AS
• Sold Mar 2017£103,500 | 3 Bed House14, Allen Street, Mountain Ash, CF45 4BD14, Allen Street, Mountain Ash, CF45 4BD
• Sold Dec 2015£62,000 | 3 Bed House39, Phillip Street, Mountain Ash, CF45 4BE39, Phillip Street, Mountain Ash, CF45 4BE

Of the 63 addresses on Allen Street, Mountain Ash, CF45, 27, Allen Street, Mountain Ash comes out as the 21st largest and the 35th most expensive in our analysis of the public data.

It is also £21k less expensive than the average property across the CF45 district.

• Mountain Ash

  |

  400 m away
• Fernhill

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  1.2 km away
• Penrhiwceiber

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  2.1 km away

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