HM Land Registry records the plot of land for 15, Stream Street, Mountain Ash as measuring 116 m².

That makes it the 8th largest plot in the postcode, where 22 of the 26 other houses have recorded plot data.

15, Stream Street, Mountain Ash has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 16 Oct 2018.

The property is connected to mains gas and has mostly double glazing. It is heated using a boiler and radiators (mains gas).

Since 2016 56 properties similar to 15, 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 3rd November 2025, was 32, Napier Street, Mountain Ash, CF45 3HW, a freehold house which sold for £60,000.

Read more about house prices in CF45.

• 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 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 Jul 2024£76,000 | 3 Bed House72, High Street, Mountain Ash, CF45 3LD72, High Street, Mountain Ash, CF45 3LD
• 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 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 Aug 2022£72,500 | 3 Bed House30, Duffryn Street, Mountain Ash, CF45 3NU30, Duffryn Street, Mountain Ash, CF45 3NU
• Sold Jul 2022£55,000 | 3 Bed House32, Dover Street, Mountain Ash, CF45 3HU32, Dover Street, Mountain Ash, CF45 3HU
• Sold Jun 2021£78,000 | 3 Bed House26, Duffryn Street, Mountain Ash, CF45 3NU26, Duffryn Street, Mountain Ash, CF45 3NU
• Sold Apr 2021£70,000 | 3 Bed House96, High Street, Mountain Ash, CF45 3LN96, High Street, Mountain Ash, CF45 3LN
• Sold Mar 2021£72,500 | 3 Bed House36, Napier Street, Mountain Ash, CF45 3HW36, Napier Street, Mountain Ash, CF45 3HW
• Sold Dec 2020£66,000 | 3 Bed House123, High Street, Mountain Ash, CF45 3LN123, High Street, Mountain Ash, CF45 3LN
• Sold Aug 2018£61,500 | 3 Bed House14, Stream Street, Mountain Ash, CF45 3LL14, Stream Street, Mountain Ash, CF45 3LL
• Sold Feb 2018£58,000 | 3 Bed House4, Napier Street, Mountain Ash, CF45 3HW4, Napier Street, Mountain Ash, CF45 3HW
• 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
• Sold Aug 2016£59,000 | 3 Bed House8, Napier Street, Mountain Ash, CF45 3HW8, Napier Street, Mountain Ash, CF45 3HW

Of the 26 addresses on Stream Street, Mountain Ash, CF45, 15, Stream Street, Mountain Ash comes out as the 26th largest and the 24th most expensive in our analysis of the public data.

It is also £71k 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.