According to data from HM Land Registry, 12, Arnold Street, Mountain Ash sits on a plot of 95 m².

We have plot size data on 55 out of 65 other houses in the postcode and 12, Arnold Street, Mountain Ash sits on the 54th largest plot.

12, Arnold Street, Mountain Ash has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 04 Mar 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, 12, Arnold Street, Mountain Ash was last sold on 15th October 2008 for £51,000 and was recorded as a freehold house.

The property has only had this single sale since 1995.

Since October 2008, the market for similar properties has risen by 66.4%.

• Sold Oct 2008£51,000

According to the Land Registry and our network of Estate Agents, there have been 162 sales of properties similar to 12, Arnold Street, Mountain Ash within a radius of 700 metres since 2017.

The most recent example is Aberpennar Cottage, Dover Street, Mountain Ash, CF45 3HY, a freehold house which sold for £142,500 on the 4th February 2026.

Read more about house prices in CF45.

• 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 Feb 2024£125,000 | 4 Bed House76, Phillip Street, Mountain Ash, CF45 4BG76, Phillip Street, Mountain Ash, CF45 4BG
• Sold Jan 2024£105,000 | 3 Bed House12, Phillip Street, Mountain Ash, CF45 4BE12, Phillip Street, Mountain Ash, CF45 4BE
• Sold Aug 2023£155,000 | 3 Bed House12, Navigation Street, Mountain Ash, CF45 4BW12, Navigation Street, Mountain Ash, CF45 4BW
• 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 Sep 2021£107,500 | 3 Bed House37, Arnold Street, Mountain Ash, CF45 4LF37, Arnold Street, Mountain Ash, CF45 4LF
• Sold May 2021£109,000 | 3 Bed House30, Phillip Street, Mountain Ash, CF45 4BE30, Phillip Street, Mountain Ash, CF45 4BE
• Sold Apr 2021£94,250 | 3 Bed House8, Alexandra Terrace, Mountain Ash, CF45 4LE8, Alexandra Terrace, Mountain Ash, CF45 4LE
• 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 Mar 2020£85,000 | 3 Bed House13, Phillip Street, Mountain Ash, CF45 4BE13, Phillip Street, Mountain Ash, CF45 4BE
• Sold May 2017£72,000 | 3 Bed House53, Arnold Street, Mountain Ash, CF45 4LF53, Arnold Street, Mountain Ash, CF45 4LF
• Sold Feb 2017£73,000 | 3 Bed House50, Arnold Street, Mountain Ash, CF45 4LF50, Arnold Street, Mountain Ash, CF45 4LF

Arnold Street, Mountain Ash, CF45 has a total of 65 addresses. According to our analysis of all the public data, 12, Arnold Street, Mountain Ash is the 16th largest and the 13th most expensive property on the street.

When compared to the postcode district it is £21k less expensive than the average property in CF45.

• Mountain Ash

  |

  400 m away
• Fernhill

  |

  1.5 km away
• Penrhiwceiber

  |

  2.0 km away

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