HM Land Registry records the plot of land for 21, Walsh Street, Mountain Ash as measuring 112 m².

That makes it the 10th largest plot in the postcode, where 35 of the 39 other houses have recorded plot data.

The most recent sale of 21, Walsh Street, Mountain Ash completed on 20th November 2015 at £65,000 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 171.8% over the period since November 2015.

• Sold Nov 2015£65,000

Since 2009 114 properties similar to 21, Walsh Street, Mountain Ash have sold within a radius of 1.6 kilometres, per the Land Registry and our network of Estate Agents.

The latest, on the 8th May 2026, was 17, Homerton Street, Mountain Ash, CF45 4YP, a freehold house which sold for £95,000.

Read more about house prices in CF45.

• Sold May 2026£95,000 | 3 Bed House17, Homerton Street, Mountain Ash, CF45 4YP17, Homerton Street, Mountain Ash, CF45 4YP
• Sold Apr 2026£83,000 | 3 Bed House10, Pentwyn Avenue, Mountain Ash, CF45 4YF10, Pentwyn Avenue, Mountain Ash, CF45 4YF
• Sold Feb 2026£105,000 | 3 Bed House25, Walsh Street, Mountain Ash, CF45 4YS25, Walsh Street, Mountain Ash, CF45 4YS
• Sold Nov 2025£88,000 | 3 Bed House134, Bryntirion, Mountain Ash, CF45 4EX134, Bryntirion, Mountain Ash, CF45 4EX
• Sold May 2025£117,500 | 3 Bed House24, Pentwyn Avenue, Mountain Ash, CF45 4YF24, Pentwyn Avenue, Mountain Ash, CF45 4YF
• Sold Dec 2024£100,000 | 3 Bed House7, Halswell Street, Mountain Ash, CF45 4YN7, Halswell Street, Mountain Ash, CF45 4YN
• Sold Nov 2024£80,000 | 3 Bed House60, Pentwyn Avenue, Mountain Ash, CF45 4YF60, Pentwyn Avenue, Mountain Ash, CF45 4YF
• Sold Sep 2024£70,000 | 3 Bed House15, Milbourne Street, Mountain Ash, CF45 4YL15, Milbourne Street, Mountain Ash, CF45 4YL
• Sold Jun 2024£65,000 | 3 Bed House3, Homerton Street, Mountain Ash, CF45 4YP3, Homerton Street, Mountain Ash, CF45 4YP
• Sold Apr 2024£80,000 | 3 Bed House199, Bryntirion, Mountain Ash, CF45 4PJ199, Bryntirion, Mountain Ash, CF45 4PJ
• Sold Oct 2022£114,995 | 3 Bed House133, Bryntirion, Mountain Ash, CF45 4EX133, Bryntirion, Mountain Ash, CF45 4EX
• Sold Mar 2021£75,000 | 3 Bed House56, Pentwyn Avenue, Mountain Ash, CF45 4YF56, Pentwyn Avenue, Mountain Ash, CF45 4YF
• Sold Mar 2021£57,500 | 3 Bed House70, Bryntirion, Mountain Ash, CF45 4EX70, Bryntirion, Mountain Ash, CF45 4EX
• Sold Feb 2019£50,000 | 3 Bed House27, Walsh Street, Mountain Ash, CF45 4YS27, Walsh Street, Mountain Ash, CF45 4YS
• Sold Feb 2019£60,000 | 3 Bed House9, Halswell Street, Mountain Ash, CF45 4YN9, Halswell Street, Mountain Ash, CF45 4YN
• Sold Feb 2019£30,000 | 3 Bed House1, Pentwyn Avenue, Mountain Ash, CF45 4YE1, Pentwyn Avenue, Mountain Ash, CF45 4YE
• Sold Nov 2018£82,000 | 3 Bed House39, Walsh Street, Mountain Ash, CF45 4YS39, Walsh Street, Mountain Ash, CF45 4YS
• Sold Jun 2016£68,500 | 3 Bed House17, Walsh Street, Mountain Ash, CF45 4YS17, Walsh Street, Mountain Ash, CF45 4YS
• Sold Feb 2010£27,000 | 3 Bed House24, Walsh Street, Mountain Ash, CF45 4YS24, Walsh Street, Mountain Ash, CF45 4YS
• Sold Nov 2009£39,750 | 3 Bed House38, Walsh Street, Mountain Ash, CF45 4YS38, Walsh Street, Mountain Ash, CF45 4YS

Of the 39 addresses on Walsh Street, Mountain Ash, CF45, 21, Walsh Street, Mountain Ash comes out as the 7th largest and the 8th most expensive in our analysis of the public data.

It is also £57k less expensive than the average property across the CF45 district.

• Penrhiwceiber

  |

  1.3 km away
• Quakers Yard

  |

  1.7 km away
• Abercynon

  |

  2.3 km away

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