According to data from HM Land Registry, 17, Stream Street, Mountain Ash sits on a plot of 92 m².

We have plot size data on 22 out of 26 other houses in the postcode and 17, Stream Street, Mountain Ash sits on the 15th largest plot.

17, Stream Street, Mountain Ash has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 18 Mar 2025.

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

According to the Land Registry and our network of Estate Agents, there have been 47 sales of properties similar to 17, Stream Street, Mountain Ash within a radius of 580 metres since 2014.

The most recent example is 32, Napier Street, Mountain Ash, CF45 3HW, a freehold house which sold for £60,000 on the 3rd November 2025.

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 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 Jul 2023£85,000 | 3 Bed House4, Commercial Street, Mountain Ash, CF45 3PS4, Commercial Street, Mountain Ash, CF45 3PS
• 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 Apr 2022£60,000 | 3 Bed House2, Commercial Street, Mountain Ash, CF45 3PS2, Commercial Street, Mountain Ash, CF45 3PS
• Sold Mar 2022£80,000 | 3 Bed House26, Stream Street, Mountain Ash, CF45 3LL26, Stream Street, Mountain Ash, CF45 3LL
• 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 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
• Sold Aug 2018£61,500 | 3 Bed House14, Stream Street, Mountain Ash, CF45 3LL14, Stream Street, Mountain Ash, CF45 3LL
• Sold Mar 2017£38,000 | 3 Bed House121, High Street, Mountain Ash, CF45 3LN121, High Street, Mountain Ash, CF45 3LN
• Sold Feb 2014£32,000 | 3 Bed House85, High Street, Mountain Ash, CF45 3LN85, High Street, Mountain Ash, CF45 3LN

Stream Street, Mountain Ash, CF45 has a total of 26 addresses. According to our analysis of all the public data, 17, Stream Street, Mountain Ash is the 25th largest and the 26th most expensive property on the street.

When compared to the postcode district it is £75k less expensive than the average property in CF45.

• Mountain Ash

  |

  300 m away
• Fernhill

  |

  1.2 km away
• Penrhiwceiber

  |

  1.9 km away

According to data from the Environment Agency, the flood risk in this area is considered to be Very Low.