According to data from HM Land Registry, 1, John Street, Mountain Ash sits on a plot of 149 m².

We have plot size data on 3 out of 3 other houses in the postcode and 1, John Street, Mountain Ash sits on the 3rd largest plot.

1, John Street, Mountain Ash has an Energy Performance Rating (EPC) of E. This is based on the most recent assessment, dated 08 Mar 2023.

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, 1, John Street, Mountain Ash was last sold on 21st August 2018 for £85,000 and was recorded as a freehold house.

The property has had 2 sales since 1995.

Since August 2018, the market for similar properties has risen by 57.3%.

• Sold Aug 2018£85,000
• Sold May 2002£35,000

According to the Land Registry and our network of Estate Agents, there have been 270 sales of properties similar to 1, John Street, Mountain Ash within a radius of 730 metres since 2016.

The most recent example is 6, Strand Street, Mountain Ash, CF45 4HG, a freehold house which sold for £105,000 on the 13th February 2026.

Read more about house prices in CF45.

• Sold Feb 2026£105,000 | 3 Bed House6, Strand Street, Mountain Ash, CF45 4HG6, Strand Street, Mountain Ash, CF45 4HG
• Sold Jan 2026£114,950 | 3 Bed House62, Cardiff Road, Mountain Ash, CF45 4HD62, Cardiff Road, Mountain Ash, CF45 4HD
• Sold Nov 2025£122,000 | 3 Bed House13, Hughes Street, Mountain Ash, CF45 3UG13, Hughes Street, Mountain Ash, CF45 3UG
• Sold Oct 2025£89,000 | 3 Bed House36, Mary Street, Mountain Ash, CF45 4HH36, Mary Street, Mountain Ash, CF45 4HH
• Sold Oct 2025£112,000 | 3 Bed House32, Oakland Street, Mountain Ash, CF45 3AL32, Oakland Street, Mountain Ash, CF45 3AL
• Sold Mar 2025£110,000 | 3 Bed House36, Glyngwyn Street, Mountain Ash, CF45 3AF36, Glyngwyn Street, Mountain Ash, CF45 3AF
• Sold Sep 2024£110,000 | 3 Bed House17, Mary Street, Mountain Ash, CF45 4HH17, Mary Street, Mountain Ash, CF45 4HH
• Sold Aug 2024£112,000 | 3 Bed House17, Consort Street, Mountain Ash, CF45 3AY17, Consort Street, Mountain Ash, CF45 3AY
• Sold Nov 2023£125,000 | 3 Bed House58, Cardiff Road, Mountain Ash, CF45 4HD58, Cardiff Road, Mountain Ash, CF45 4HD
• Sold Nov 2023£127,500 | 3 Bed House14, Mary Street, Mountain Ash, CF45 4HH14, Mary Street, Mountain Ash, CF45 4HH
• Sold Aug 2023£100,000 | 3 Bed House33, Mary Street, Mountain Ash, CF45 4HH33, Mary Street, Mountain Ash, CF45 4HH
• Sold Jun 2023£45,000 | 3 Bed House60, Cardiff Road, Mountain Ash, CF45 4HD60, Cardiff Road, Mountain Ash, CF45 4HD
• Sold Oct 2021£85,000 | 3 Bed House42, Mary Street, Mountain Ash, CF45 4HH42, Mary Street, Mountain Ash, CF45 4HH
• Sold Oct 2020£82,000 | 3 Bed House27, Mary Street, Mountain Ash, CF45 4HH27, Mary Street, Mountain Ash, CF45 4HH
• Sold Feb 2020£66,000 | 3 Bed House12, Mary Street, Mountain Ash, CF45 4HH12, Mary Street, Mountain Ash, CF45 4HH
• Sold Feb 2020£75,000 | 3 Bed House35, Mary Street, Mountain Ash, CF45 4HH35, Mary Street, Mountain Ash, CF45 4HH
• Sold Jul 2019£52,000 | 3 Bed House17, Strand Street, Mountain Ash, CF45 4HG17, Strand Street, Mountain Ash, CF45 4HG
• Sold Jan 2019£70,000 | 3 Bed House13, Mary Street, Mountain Ash, CF45 4HH13, Mary Street, Mountain Ash, CF45 4HH
• Sold Jun 2018£45,000 | 3 Bed House20, Mary Street, Mountain Ash, CF45 4HH20, Mary Street, Mountain Ash, CF45 4HH
• Sold Mar 2016£75,000 | 3 Bed House7, Mary Street, Mountain Ash, CF45 4HH7, Mary Street, Mountain Ash, CF45 4HH

John Street, Mountain Ash, CF45 has a total of 7 addresses. According to our analysis of all the public data, 1, John Street, Mountain Ash is the 4th largest and the 4th most expensive property on the street.

When compared to the postcode district it is £42k less expensive than the average property in CF45.

• Mountain Ash

  |

  700 m away
• Penrhiwceiber

  |

  1.0 km away
• Fernhill

  |

  2.2 km away

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