HM Land Registry records the plot of land for 14, Stream Street, Mountain Ash as measuring 78 m².

That makes it the 20th largest plot in the postcode, where 22 of the 26 other houses have recorded plot data.

14, Stream Street, Mountain Ash has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 19 Jun 2026.

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 14, Stream Street, Mountain Ash completed on 7th December 2012 at £65,000 and was recorded by HM Land Registry as a freehold house.

Since 1995 the property has sold 4 times.

Values of comparable properties have risen by 127.6% over the period since December 2012.

• Sold Dec 2012£65,000
• Sold Jun 2006£72,000
• Sold Jul 2001£29,000

Since 2019 94 properties similar to 14, Stream 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 Jun 2025£95,000 | 3 Bed House33, Duffryn Street, Mountain Ash, CF45 3NU33, Duffryn Street, Mountain Ash, CF45 3NU
• Sold Feb 2025£84,000 | 3 Bed House110, High Street, Mountain Ash, CF45 3LN110, High Street, Mountain Ash, CF45 3LN
• 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 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 Aug 2023£60,000 | 3 Bed House7, Cliff Street, Mountain Ash, CF45 3LE7, Cliff Street, Mountain Ash, CF45 3LE
• Sold Aug 2023£100,000 | 3 Bed House57, Napier Street, Mountain Ash, CF45 3HW57, 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 Feb 2023£95,000 | 3 Bed House14, Cliff Street, Mountain Ash, CF45 3LE14, Cliff Street, Mountain Ash, CF45 3LE
• 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£80,000 | 3 Bed House26, Stream Street, Mountain Ash, CF45 3LL26, Stream Street, Mountain Ash, CF45 3LL
• Sold Mar 2022£55,000 | 3 Bed House1A, Cliff Street, Mountain Ash, CF45 3LE1A, Cliff Street, Mountain Ash, CF45 3LE
• Sold Oct 2021£77,000 | 3 Bed House37, Dover Street, Mountain Ash, CF45 3HU37, Dover Street, Mountain Ash, CF45 3HU
• Sold Nov 2020£54,000 | 3 Bed House15, Stream Street, Mountain Ash, CF45 3LL15, Stream Street, Mountain Ash, CF45 3LL
• Sold Jun 2019£54,500 | 3 Bed House18, Stream Street, Mountain Ash, CF45 3LL18, Stream Street, Mountain Ash, CF45 3LL

Of the 26 addresses on Stream Street, Mountain Ash, CF45, 14, Stream Street, Mountain Ash comes out as the 18th largest and the 17th most expensive in our analysis of the public data.

It is also £64k 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.