12, Stream Street, Mountain Ash has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 13 Oct 2022.

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 12, Stream Street, Mountain Ash completed on 11th April 2023 at £80,000 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 31.0% over the period since April 2023.

• Sold Apr 2023£80,000

Since 2019 132 properties similar to 12, 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 2nd September 2025, was 31, Napier Street, Mountain Ash, CF45 3HW, a freehold house which sold for £112,000.

Read more about house prices in CF45.

• Sold Sep 2025£112,000 | 3 Bed House31, Napier Street, Mountain Ash, CF45 3HW31, Napier Street, Mountain Ash, CF45 3HW
• Sold Dec 2024£85,000 | 3 Bed House55, Napier Street, Mountain Ash, CF45 3HW55, Napier Street, Mountain Ash, CF45 3HW
• Sold Oct 2024£127,500 | 3 Bed House74, Duffryn Street, Mountain Ash, CF45 3HR74, Duffryn Street, Mountain Ash, CF45 3HR
• Sold Oct 2024£55,000 | 3 Bed House39, Dover Street, Mountain Ash, CF45 3HU39, Dover Street, Mountain Ash, CF45 3HU
• Sold Sep 2024£112,500 | 3 Bed House2, Beadon Street, Mountain Ash, CF45 3RP2, Beadon Street, Mountain Ash, CF45 3RP
• Sold Mar 2024£119,000 | 3 Bed House45, Napier Street, Mountain Ash, CF45 3HW45, Napier Street, Mountain Ash, CF45 3HW
• Sold Mar 2024£75,000 | 3 Bed House119, High Street, Mountain Ash, CF45 3LN119, High Street, Mountain Ash, CF45 3LN
• Sold Oct 2023£88,500 | 3 Bed House54, Napier Street, Mountain Ash, CF45 3HW54, Napier Street, Mountain Ash, CF45 3HW
• 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 Jul 2023£85,000 | 3 Bed House82, Duffryn Street, Mountain Ash, CF45 3HR82, Duffryn Street, Mountain Ash, CF45 3HR
• Sold Feb 2023£95,000 | 3 Bed House14, Cliff Street, Mountain Ash, CF45 3LE14, Cliff Street, Mountain Ash, CF45 3LE
• Sold Jul 2022£87,500 | 3 Bed House35, Napier Street, Mountain Ash, CF45 3HW35, Napier Street, Mountain Ash, CF45 3HW
• Sold Nov 2021£85,000 | 3 Bed House82, High Street, Mountain Ash, CF45 3LN82, High Street, Mountain Ash, CF45 3LN
• Sold Aug 2021£69,000 | 3 Bed House105, High Street, Mountain Ash, CF45 3LN105, High Street, Mountain Ash, CF45 3LN
• Sold Mar 2021£78,000 | 3 Bed House73, Duffryn Street, Mountain Ash, CF45 3HR73, Duffryn Street, Mountain Ash, CF45 3HR
• Sold Jul 2019£97,000 | 3 Bed House19, Stream Street, Mountain Ash, CF45 3LL19, Stream Street, Mountain Ash, CF45 3LL
• Sold Mar 2019£58,000 | 3 Bed House25, Dover Street, Mountain Ash, CF45 3HU25, Dover Street, Mountain Ash, CF45 3HU
• Sold Feb 2019£66,000 | 3 Bed House15, Dover Street, Mountain Ash, CF45 3HU15, Dover Street, Mountain Ash, CF45 3HU
• Sold Jan 2019£70,000 | 3 Bed House10, Stream Street, Mountain Ash, CF45 3LL10, Stream Street, Mountain Ash, CF45 3LL

Of the 26 addresses on Stream Street, Mountain Ash, CF45, 12, Stream Street, Mountain Ash comes out as the 11th largest and the 11th most expensive in our analysis of the public data.

It is also £56k 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.