HM Land Registry records the plot of land for 4, Duffryn Street, Mountain Ash as measuring 115 m².

That makes it the 6th largest plot in the postcode, where 31 of the 35 other houses have recorded plot data.

4, Duffryn Street, Mountain Ash has an Energy Performance Rating (EPC) of C. This is based on the most recent assessment, dated 01 Jul 2024.

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

The most recent sale of 4, Duffryn Street, Mountain Ash completed on 14th November 2014 at £46,000 and was recorded by HM Land Registry as a freehold house.

Since 1995 this is the property's only sale.

Values of comparable properties have risen by 117.9% over the period since November 2014.

• Sold Nov 2014£46,000

Since 2016 158 properties similar to 4, Duffryn Street, Mountain Ash have sold within a radius of 560 metres, per the Land Registry and our network of Estate Agents.

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

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 Jun 2025£95,000 | 3 Bed House33, Duffryn Street, Mountain Ash, CF45 3NU33, Duffryn Street, Mountain Ash, CF45 3NU
• Sold Dec 2024£68,000 | 3 Bed House5, Fountain Street, Mountain Ash, CF45 3PA5, Fountain Street, Mountain Ash, CF45 3PA
• Sold Nov 2024£100,000 | 3 Bed House21, Dover Street, Mountain Ash, CF45 3HU21, Dover Street, Mountain Ash, CF45 3HU
• Sold Apr 2024£81,000 | 3 Bed House28, Duffryn Street, Mountain Ash, CF45 3NU28, Duffryn Street, Mountain Ash, CF45 3NU
• Sold Dec 2023£56,500 | 3 Bed House58A, Duffryn Street, Mountain Ash, CF45 3HR58A, Duffryn Street, Mountain Ash, CF45 3HR
• 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 Aug 2023£60,000 | 3 Bed House7, Cliff Street, Mountain Ash, CF45 3LE7, Cliff Street, Mountain Ash, CF45 3LE
• Sold Aug 2023£112,500 | 3 Bed House4, Woodland Terrace, Mountain Ash, CF45 3RF4, Woodland Terrace, Mountain Ash, CF45 3RF
• Sold Feb 2023£95,000 | 3 Bed House14, Cliff Street, Mountain Ash, CF45 3LE14, Cliff Street, Mountain Ash, CF45 3LE
• Sold Aug 2022£72,500 | 3 Bed House30, Duffryn Street, Mountain Ash, CF45 3NU30, Duffryn Street, Mountain Ash, CF45 3NU
• Sold Jun 2021£78,000 | 3 Bed House26, Duffryn Street, Mountain Ash, CF45 3NU26, Duffryn Street, Mountain Ash, CF45 3NU
• Sold Feb 2021£83,000 | 3 Bed House16, Duffryn Street, Mountain Ash, CF45 3NU16, 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 Apr 2019£70,000 | 3 Bed House24, Duffryn Street, Mountain Ash, CF45 3NU24, 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 Nov 2018£64,000 | 3 Bed House31, Duffryn Street, Mountain Ash, CF45 3NU31, Duffryn Street, Mountain Ash, CF45 3NU
• Sold Sep 2018£36,000 | 3 Bed House21, Duffryn Street, Mountain Ash, CF45 3NU21, Duffryn Street, Mountain Ash, CF45 3NU
• Sold Jul 2016£45,000 | 3 Bed House7, Duffryn Street, Mountain Ash, CF45 3NU7, Duffryn Street, Mountain Ash, CF45 3NU

Of the 93 addresses on Duffryn Street, Mountain Ash, CF45, 4, Duffryn Street, Mountain Ash comes out as the 52nd largest and the 64th most expensive in our analysis of the public data.

It is also £57k less expensive than the average property across the CF45 district.

• Mountain Ash

  |

  400 m away
• Fernhill

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  1.1 km away
• Penrhiwceiber

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  2.1 km away

The flood risk here is rated Very Low, based on Environment Agency data.