According to data from HM Land Registry, 4, Napier Street, Mountain Ash sits on a plot of 100 m².

We have plot size data on 43 out of 50 other houses in the postcode and 4, Napier Street, Mountain Ash sits on the 20th largest plot.

4, Napier Street, Mountain Ash has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 10 Apr 2014.

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 HM Land Registry, 4, Napier Street, Mountain Ash was last sold on 20th February 2018 for £58,000 and was recorded as a freehold house.

The property has only had this single sale since 1995.

Since February 2018, the market for similar properties has risen by 78.9%.

• Sold Feb 2018£58,000

According to the Land Registry and our network of Estate Agents, there have been 65 sales of properties similar to 4, Napier Street, Mountain Ash within a radius of 500 metres since 2016.

The most recent example is 15, Cliff Street, Mountain Ash, CF45 3LE, a freehold house which sold for £103,000 on the 10th June 2026.

Read more about house prices in CF45.

• Sold Jun 2026£103,000 | 3 Bed House15, Cliff Street, Mountain Ash, CF45 3LE15, Cliff Street, Mountain Ash, CF45 3LE
• 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 Apr 2024£81,000 | 3 Bed House28, Duffryn Street, Mountain Ash, CF45 3NU28, Duffryn Street, Mountain Ash, CF45 3NU
• 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 Aug 2022£72,500 | 3 Bed House30, Duffryn Street, Mountain Ash, CF45 3NU30, Duffryn Street, Mountain Ash, CF45 3NU
• Sold Jun 2021£78,000 | 3 Bed House26, Duffryn Street, Mountain Ash, CF45 3NU26, Duffryn Street, Mountain Ash, CF45 3NU
• Sold Mar 2021£72,500 | 3 Bed House36, Napier Street, Mountain Ash, CF45 3HW36, Napier Street, Mountain Ash, CF45 3HW
• Sold Nov 2019£62,000 | 3 Bed House32, Duffryn Street, Mountain Ash, CF45 3NU32, Duffryn Street, Mountain Ash, CF45 3NU
• Sold Aug 2016£59,000 | 3 Bed House8, Napier Street, Mountain Ash, CF45 3HW8, Napier Street, Mountain Ash, CF45 3HW
• Sold Apr 2016£59,000 | 3 Bed House14, Napier Street, Mountain Ash, CF45 3HW14, Napier Street, Mountain Ash, CF45 3HW

Napier Street, Mountain Ash, CF45 has a total of 50 addresses. According to our analysis of all the public data, 4, Napier Street, Mountain Ash is the 34th largest and the 34th most expensive property on the street.

When compared to the postcode district it is £67k less expensive than the average property in CF45.

• Mountain Ash

  |

  200 m away
• Fernhill

  |

  1.3 km away
• Penrhiwceiber

  |

  1.8 km away

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