HM Land Registry records the plot of land for 15, Cliff Street, Mountain Ash as measuring 73 m².

That makes it the 32nd largest plot in the postcode, where 35 of the 42 other houses have recorded plot data.

15, Cliff Street, Mountain Ash has an Energy Performance Rating (EPC) of C. This is based on the most recent assessment, dated 24 Oct 2025.

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 15, Cliff Street, Mountain Ash completed on 10th June 2026 at £103,000 and was recorded by HM Land Registry as a freehold house.

Since 1995 the property has sold twice.

Values of comparable properties have risen by 17.5% over the period since June 2026.

• Sold Jun 2026£103,000
• Sold Jan 1998£27,500

Since 2017 74 properties similar to 15, Cliff Street, Mountain Ash have sold within a radius of 570 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 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 Nov 2024£100,000 | 3 Bed House21, Dover Street, Mountain Ash, CF45 3HU21, Dover Street, Mountain Ash, CF45 3HU
• Sold Jul 2024£72,000 | 3 Bed House20, Stream Street, Mountain Ash, CF45 3LL20, Stream Street, Mountain Ash, CF45 3LL
• 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 Nov 2023£109,000 | 3 Bed House77, Duffryn Street, Mountain Ash, CF45 3HR77, 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 Apr 2023£108,000 | 3 Bed House13, Stream Street, Mountain Ash, CF45 3LL13, Stream Street, Mountain Ash, CF45 3LL
• Sold Nov 2022£85,000 | 3 Bed House72, Duffryn Street, Mountain Ash, CF45 3HR72, Duffryn Street, Mountain Ash, CF45 3HR
• Sold Jul 2022£55,000 | 3 Bed House32, Dover Street, Mountain Ash, CF45 3HU32, Dover Street, Mountain Ash, CF45 3HU
• Sold Mar 2022£55,000 | 3 Bed House1A, Cliff Street, Mountain Ash, CF45 3LE1A, Cliff Street, Mountain Ash, CF45 3LE
• Sold Mar 2022£80,000 | 3 Bed House26, Stream Street, Mountain Ash, CF45 3LL26, Stream Street, Mountain Ash, CF45 3LL
• Sold Mar 2021£72,500 | 3 Bed House36, Napier Street, Mountain Ash, CF45 3HW36, Napier Street, Mountain Ash, CF45 3HW
• Sold Nov 2020£54,000 | 3 Bed House15, Stream Street, Mountain Ash, CF45 3LL15, Stream Street, Mountain Ash, CF45 3LL
• Sold Dec 2017£35,000 | 3 Bed House9, Cliff Street, Mountain Ash, CF45 3LE9, Cliff Street, Mountain Ash, CF45 3LE
• Sold Mar 2017£58,000 | 3 Bed House25, Cliff Street, Mountain Ash, CF45 3LE25, Cliff Street, Mountain Ash, CF45 3LE

Of the 42 addresses on Cliff Street, Mountain Ash, CF45, 15, Cliff Street, Mountain Ash comes out as the 36th largest and the 36th most expensive in our analysis of the public data.

It is also £61k less expensive than the average property across the CF45 district.

• Mountain Ash

  |

  300 m away
• Fernhill

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  1.2 km away
• Penrhiwceiber

  |

  1.9 km away

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