11, Duffryn Street, Mountain Ash occupies a 64 m² plot as recorded by HM Land Registry.

Of the 35 other houses in this postcode, 31 have recorded plot sizes, and this one ranks as the 25th largest.

11, Duffryn Street, Mountain Ash has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 12 Dec 2013.

The property is not connected to mains gas and has fully double glazed windows. It is heated using a boiler and radiators (mains gas).

Land Registry records and our Estate Agent network show 43 sales of comparable properties within 530 metres of 11, Duffryn Street, Mountain Ash since 2016.

Most recently, 29, Cliff Street, Mountain Ash, CF45 3LE, a freehold house, sold at £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 Dec 2024£115,000 | 3 Bed House19, Pryce Street, Mountain Ash, CF45 3NT19, Pryce Street, Mountain Ash, CF45 3NT
• Sold Jul 2024£63,000 | 3 Bed House28, Napier Street, Mountain Ash, CF45 3HW28, Napier Street, Mountain Ash, CF45 3HW
• Sold Jun 2024£75,000 | 3 Bed House16, Stream Street, Mountain Ash, CF45 3LL16, Stream Street, Mountain Ash, CF45 3LL
• 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£90,000 | 3 Bed House9, Pryce Street, Mountain Ash, CF45 3NS9, Pryce Street, Mountain Ash, CF45 3NS
• Sold Jul 2023£85,000 | 3 Bed House4, Commercial Street, Mountain Ash, CF45 3PS4, Commercial Street, Mountain Ash, CF45 3PS
• Sold Aug 2022£72,500 | 3 Bed House30, Duffryn Street, Mountain Ash, CF45 3NU30, Duffryn Street, Mountain Ash, CF45 3NU
• Sold Apr 2022£76,250 | 3 Bed House46, Commercial Street, Mountain Ash, CF45 3PW46, Commercial Street, Mountain Ash, CF45 3PW
• 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 May 2021£65,500 | 2 Bed House13, Allen Street, Mountain Ash, CF45 4BD13, Allen Street, Mountain Ash, CF45 4BD
• Sold Mar 2021£72,500 | 3 Bed House36, Napier Street, Mountain Ash, CF45 3HW36, Napier Street, Mountain Ash, CF45 3HW
• Sold Nov 2019£62,000 | 3 Bed House32, Duffryn Street, Mountain Ash, CF45 3NU32, Duffryn Street, Mountain Ash, CF45 3NU
• Sold Dec 2018£52,000 | 3 Bed House18, Duffryn Street, Mountain Ash, CF45 3NU18, Duffryn Street, Mountain Ash, CF45 3NU
• Sold Feb 2018£58,000 | 3 Bed House4, Napier Street, Mountain Ash, CF45 3HW4, Napier Street, Mountain Ash, CF45 3HW
• Sold Aug 2016£47,500 | 3 Bed House12, Duffryn Street, Mountain Ash, CF45 3NU12, Duffryn Street, Mountain Ash, CF45 3NU

Our analysis of the public data ranks 11, Duffryn Street, Mountain Ash as the 83rd largest and the 83rd most expensive of the 93 addresses on Duffryn Street, Mountain Ash, CF45.

Against the CF45 postcode district average, it is £67k less expensive than the typical property.

• Mountain Ash

  |

  400 m away
• Fernhill

  |

  1.1 km away
• Penrhiwceiber

  |

  2.1 km away

Environment Agency data suggests this area has a Very Low risk of flooding.