HM Land Registry records the plot of land for 18, Jeffrey Street, Mountain Ash as measuring 134 m².

That makes it the 4th largest plot in the postcode, where 12 of the 14 other houses have recorded plot data.

18, Jeffrey Street, Mountain Ash has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 26 May 2021.

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 18, Jeffrey Street, Mountain Ash completed on 31st January 2011 at £100,000 and was recorded by HM Land Registry as a freehold house.

Since 1995 the property has sold twice.

Values of comparable properties have risen by 84.9% over the period since January 2011.

• Sold Jan 2011£100,000
• Sold Oct 2009£56,000

Since 2020 198 properties similar to 18, Jeffrey Street, Mountain Ash have sold within a radius of 550 metres, per the Land Registry and our network of Estate Agents.

The latest, on the 4th February 2026, was Aberpennar Cottage, Dover Street, Mountain Ash, CF45 3HY, a freehold house which sold for £142,500.

Read more about house prices in CF45.

• Sold Feb 2026£142,500 | 3 Bed HouseAberpennar Cottage, Dover Street, Mountain Ash, CF45 3HYAberpennar Cottage, Dover Street, Mountain Ash, CF45 3HY
• Sold Dec 2025£95,000 | 3 Bed House8, Woodland Terrace, Mountain Ash, CF45 3RF8, Woodland Terrace, Mountain Ash, CF45 3RF
• Sold Nov 2025£115,000 | 3 Bed House81, Duffryn Street, Mountain Ash, CF45 3HR81, Duffryn Street, Mountain Ash, CF45 3HR
• Sold Oct 2025£140,000 | 3 Bed House59, Arnold Street, Mountain Ash, CF45 4LF59, Arnold Street, Mountain Ash, CF45 4LF
• Sold Jul 2025£49,000 | 3 Bed House49, Commercial Street, Mountain Ash, CF45 3PS49, Commercial Street, Mountain Ash, CF45 3PS
• Sold Jul 2025£115,000 | 3 Bed House13, London Street, Mountain Ash, CF45 4BN13, London Street, Mountain Ash, CF45 4BN
• Sold Jan 2025£81,500 | 3 Bed House2, Cliff Street, Mountain Ash, CF45 3LE2, Cliff Street, Mountain Ash, CF45 3LE
• Sold Oct 2024£80,000 | 3 Bed House18, Phillip Street, Mountain Ash, CF45 4BE18, Phillip Street, Mountain Ash, CF45 4BE
• Sold Oct 2024£85,000 | 3 Bed House3, London Street, Mountain Ash, CF45 4BN3, London Street, Mountain Ash, CF45 4BN
• Sold Jul 2024£77,000 | 3 Bed House15, Lyle Street, Mountain Ash, CF45 3RG15, Lyle Street, Mountain Ash, CF45 3RG
• Sold Jan 2024£105,000 | 3 Bed House12, Phillip Street, Mountain Ash, CF45 4BE12, Phillip Street, Mountain Ash, CF45 4BE
• Sold Apr 2023£94,000 | 3 Bed House10, Jeffrey Street, Mountain Ash, CF45 4BS10, Jeffrey Street, Mountain Ash, CF45 4BS
• Sold Aug 2022£135,000 | 3 Bed House15, Arnold Street, Mountain Ash, CF45 4LF15, Arnold Street, Mountain Ash, CF45 4LF
• Sold Mar 2022£115,000 | 3 Bed House56, Phillip Street, Mountain Ash, CF45 4BG56, Phillip Street, Mountain Ash, CF45 4BG
• Sold Sep 2021£107,500 | 3 Bed House37, Arnold Street, Mountain Ash, CF45 4LF37, Arnold Street, Mountain Ash, CF45 4LF
• Sold Jun 2021£120,000 | 3 Bed House4, Phillip Street, Mountain Ash, CF45 4BE4, Phillip Street, Mountain Ash, CF45 4BE
• Sold Jun 2021£80,000 | 3 Bed House24, Arnold Street, Mountain Ash, CF45 4LF24, Arnold Street, Mountain Ash, CF45 4LF
• Sold Mar 2021£65,000 | 3 Bed House23, Phillip Street, Mountain Ash, CF45 4BE23, Phillip Street, Mountain Ash, CF45 4BE
• Sold Aug 2020£72,000 | 3 Bed House58, Phillip Street, Mountain Ash, CF45 4BG58, Phillip Street, Mountain Ash, CF45 4BG
• Sold Jul 2020£112,000 | 3 Bed House51, Phillip Street, Mountain Ash, CF45 4BG51, Phillip Street, Mountain Ash, CF45 4BG

Of the 16 addresses on Jeffrey Street, Mountain Ash, CF45, 18, Jeffrey Street, Mountain Ash comes out as the 10th largest and the 11th most expensive in our analysis of the public data.

It is also £33k less expensive than the average property across the CF45 district.

• Mountain Ash

  |

  300 m away
• Fernhill

  |

  1.3 km away
• Penrhiwceiber

  |

  1.9 km away

The flood risk here is rated Very Low, based on Environment Agency data.