According to data from HM Land Registry, 59, Allen Street, Mountain Ash sits on a plot of 120 m².

We have plot size data on 25 out of 31 other houses in the postcode and 59, Allen Street, Mountain Ash sits on the 15th largest plot.

59, Allen Street, Mountain Ash has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 19 Sep 2025.

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

According to HM Land Registry, 59, Allen Street, Mountain Ash was last sold on 9th March 2026 for £189,998 and was recorded as a freehold house.

The property has only had this single sale since 1995.

Since March 2026, the market for similar properties has dropped by 1.5%.

• Sold Mar 2026£189,998

According to the Land Registry and our network of Estate Agents, there have been 90 sales of properties similar to 59, Allen Street, Mountain Ash within a radius of 770 metres since 2017.

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

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£160,000 | 3 Bed House10, The Triangle, Mountain Ash, CF45 4BA10, The Triangle, Mountain Ash, CF45 4BA
• Sold Feb 2026£158,000 | 3 Bed House24, Richmond Road, Mountain Ash, CF45 4AN24, Richmond Road, Mountain Ash, CF45 4AN
• Sold Oct 2025£130,000 | 3 Bed House26, The Triangle, Mountain Ash, CF45 4BA26, The Triangle, Mountain Ash, CF45 4BA
• Sold Jul 2025£210,000 | 4 Bed House18, Richmond Road, Mountain Ash, CF45 4AN18, Richmond Road, Mountain Ash, CF45 4AN
• Sold Sep 2024£180,000 | 3 Bed House7, Campbell Terrace, Mountain Ash, CF45 4AE7, Campbell Terrace, Mountain Ash, CF45 4AE
• Sold Mar 2024£144,000 | 3 Bed House24, The Triangle, Mountain Ash, CF45 4BA24, The Triangle, Mountain Ash, CF45 4BA
• Sold Aug 2023£180,000 | 3 Bed House3, Beckett Street, Mountain Ash, CF45 4AW3, Beckett Street, Mountain Ash, CF45 4AW
• Sold Jul 2023£70,000 | 4 Bed House26, Copley Street, Mountain Ash, CF45 4AS26, Copley Street, Mountain Ash, CF45 4AS
• Sold Feb 2023£150,000 | 3 Bed House12, Richmond Road, Mountain Ash, CF45 4AN12, Richmond Road, Mountain Ash, CF45 4AN
• Sold Dec 2022£180,000 | 3 Bed House23, Campbell Terrace, Mountain Ash, CF45 4AE23, Campbell Terrace, Mountain Ash, CF45 4AE
• Sold Sep 2022£120,000 | 4 Bed House14, Phillip Street, Mountain Ash, CF45 4BE14, Phillip Street, Mountain Ash, CF45 4BE
• Sold Aug 2022£185,000 | 3 Bed House19, Campbell Terrace, Mountain Ash, CF45 4AE19, Campbell Terrace, Mountain Ash, CF45 4AE
• Sold Jul 2022£164,000 | 4 Bed House30, Richmond Road, Mountain Ash, CF45 4AN30, Richmond Road, Mountain Ash, CF45 4AN
• Sold Dec 2021£150,000 | 3 Bed House25, The Triangle, Mountain Ash, CF45 4BA25, The Triangle, Mountain Ash, CF45 4BA
• Sold Apr 2021£146,000 | 3 Bed House8, Campbell Terrace, Mountain Ash, CF45 4AE8, Campbell Terrace, Mountain Ash, CF45 4AE
• Sold Feb 2021£123,000 | 3 Bed House30, The Triangle, Mountain Ash, CF45 4BA30, The Triangle, Mountain Ash, CF45 4BA
• Sold Aug 2019£71,500 | 4 Bed House13, The Triangle, Mountain Ash, CF45 4BA13, The Triangle, Mountain Ash, CF45 4BA
• Sold Feb 2019£98,800 | 3 Bed House56, Allen Street, Mountain Ash, CF45 4BB56, Allen Street, Mountain Ash, CF45 4BB
• Sold Jul 2017£110,000 | 3 Bed House31, The Triangle, Mountain Ash, CF45 4BA31, The Triangle, Mountain Ash, CF45 4BA

Allen Street, Mountain Ash, CF45 has a total of 63 addresses. According to our analysis of all the public data, 59, Allen Street, Mountain Ash is the 20th largest and the 17th most expensive property on the street.

When compared to the postcode district it is £18k more expensive than the average property in CF45.

• Mountain Ash

  |

  500 m away
• Fernhill

  |

  1.3 km away
• Penrhiwceiber

  |

  2.1 km away

According to data from the Environment Agency, the flood risk in this area is considered to be Very Low.