According to data from HM Land Registry, 12, Duffryn Street, Mountain Ash sits on a plot of 87 m².

We have plot size data on 31 out of 35 other houses in the postcode and 12, Duffryn Street, Mountain Ash sits on the 22nd largest plot.

12, Duffryn Street, Mountain Ash has an Energy Performance Rating (EPC) of C. This is based on the most recent assessment, dated 17 Jun 2016.

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, Duffryn Street, Mountain Ash was last sold on 5th August 2016 for £47,500 and was recorded as a freehold house.

The property has had 2 sales since 1995.

Since August 2016, the market for similar properties has risen by 107.7%.

• Sold Aug 2016£47,500
• Sold Nov 2010£37,000

According to the Land Registry and our network of Estate Agents, there have been 86 sales of properties similar to 12, Duffryn Street, Mountain Ash within a radius of 540 metres since 2018.

The most recent example is 29, Cliff Street, Mountain Ash, CF45 3LE, a freehold house which sold for £120,000 on the 14th November 2025.

Read more about house prices in CF45.

• Sold Nov 2025£120,000 | 3 Bed House29, Cliff Street, Mountain Ash, CF45 3LE29, Cliff Street, Mountain Ash, CF45 3LE
• Sold Nov 2025£60,000 | 3 Bed House32, Napier Street, Mountain Ash, CF45 3HW32, Napier Street, Mountain Ash, CF45 3HW
• Sold Jun 2025£95,000 | 3 Bed House33, Duffryn Street, Mountain Ash, CF45 3NU33, Duffryn Street, Mountain Ash, CF45 3NU
• Sold Dec 2024£115,000 | 3 Bed House19, Pryce Street, Mountain Ash, CF45 3NT19, Pryce Street, Mountain Ash, CF45 3NT
• Sold Dec 2024£68,000 | 3 Bed House5, Fountain Street, Mountain Ash, CF45 3PA5, Fountain Street, Mountain Ash, CF45 3PA
• Sold Jul 2024£72,000 | 3 Bed House20, Stream Street, Mountain Ash, CF45 3LL20, Stream Street, Mountain Ash, CF45 3LL
• Sold Jun 2024£75,000 | 3 Bed House16, Stream Street, Mountain Ash, CF45 3LL16, Stream Street, Mountain Ash, CF45 3LL
• Sold Apr 2024£81,000 | 3 Bed House28, Duffryn Street, Mountain Ash, CF45 3NU28, Duffryn Street, Mountain Ash, CF45 3NU
• Sold Feb 2024£89,000 | 3 Bed House24, Napier Street, Mountain Ash, CF45 3HW24, Napier Street, Mountain Ash, CF45 3HW
• Sold Dec 2023£56,500 | 3 Bed House58A, Duffryn Street, Mountain Ash, CF45 3HR58A, Duffryn Street, Mountain Ash, CF45 3HR
• Sold Oct 2023£78,500 | 3 Bed House30, Napier Street, Mountain Ash, CF45 3HW30, Napier Street, Mountain Ash, CF45 3HW
• Sold Sep 2023£75,000 | 3 Bed House5, Duffryn Street, Mountain Ash, CF45 3NU5, Duffryn Street, Mountain Ash, CF45 3NU
• Sold Aug 2023£66,000 | 3 Bed House6, Duffryn Street, Mountain Ash, CF45 3NU6, Duffryn Street, Mountain Ash, CF45 3NU
• Sold Feb 2023£95,000 | 3 Bed House4, Duffryn Street, Mountain Ash, CF45 3NU4, Duffryn Street, Mountain Ash, CF45 3NU
• Sold Aug 2022£72,500 | 3 Bed House30, Duffryn Street, Mountain Ash, CF45 3NU30, Duffryn Street, Mountain Ash, CF45 3NU
• Sold Apr 2022£60,000 | 3 Bed House2, Commercial Street, Mountain Ash, CF45 3PS2, Commercial Street, Mountain Ash, CF45 3PS
• Sold Jun 2021£78,000 | 3 Bed House26, Duffryn Street, Mountain Ash, CF45 3NU26, Duffryn Street, Mountain Ash, CF45 3NU
• Sold Nov 2019£62,000 | 3 Bed House32, Duffryn Street, Mountain Ash, CF45 3NU32, Duffryn Street, Mountain Ash, CF45 3NU
• Sold Jul 2019£55,500 | 3 Bed House18, Commercial Street, Mountain Ash, CF45 3PS18, Commercial Street, Mountain Ash, CF45 3PS
• Sold Dec 2018£52,000 | 3 Bed House18, Duffryn Street, Mountain Ash, CF45 3NU18, Duffryn Street, Mountain Ash, CF45 3NU

Duffryn Street, Mountain Ash, CF45 has a total of 93 addresses. According to our analysis of all the public data, 12, Duffryn Street, Mountain Ash is the 70th largest and the 74th most expensive property on the street.

When compared to the postcode district it is £62k less expensive than the average property in CF45.

• Mountain Ash

  |

  400 m away
• Fernhill

  |

  1.1 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.