HM Land Registry records the plot of land for 18, Castleton Avenue, Treorchy as measuring 173 m².

That makes it the 26th largest plot in the postcode, where 27 of the 30 other houses have recorded plot data.

18, Castleton Avenue, Treorchy has an Energy Performance Rating (EPC) of C. This is based on the most recent assessment, dated 17 Nov 2025.

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

Since 2019 203 properties similar to 18, Castleton Avenue, Treorchy have sold within a radius of 1.5 kilometres, per the Land Registry and our network of Estate Agents.

The latest, on the 6th March 2026, was 107, Brook Street, Treorchy, CF42 5SF, a freehold house which sold for £95,000.

Read more about house prices in CF42.

• Sold Mar 2026£95,000 | 3 Bed House107, Brook Street, Treorchy, CF42 5SF107, Brook Street, Treorchy, CF42 5SF
• Sold Dec 2025£118,500 | 3 Bed House39, Blaenrhondda Road, Treorchy, CF42 5SP39, Blaenrhondda Road, Treorchy, CF42 5SP
• Sold Aug 2025£125,000 | 3 Bed House75, Brook Street, Treorchy, CF42 5SA75, Brook Street, Treorchy, CF42 5SA
• Sold Jul 2025£68,000 | 3 Bed House2, Chapel Street, Treorchy, CF42 5SE2, Chapel Street, Treorchy, CF42 5SE
• Sold Jul 2025£132,000 | 3 Bed House18, Clyngwyn Road, Treorchy, CF42 5SL18, Clyngwyn Road, Treorchy, CF42 5SL
• Sold Jul 2025£130,000 | 3 Bed House25, Castleton Avenue, Treorchy, CF42 5SS25, Castleton Avenue, Treorchy, CF42 5SS
• Sold Mar 2025£104,000 | 3 Bed House20, Halifax Terrace, Treorchy, CF42 5SU20, Halifax Terrace, Treorchy, CF42 5SU
• Sold Feb 2025£78,000 | 3 Bed House20, St. Albans Road, Treorchy, CF42 5DD20, St. Albans Road, Treorchy, CF42 5DD
• Sold Oct 2024£127,000 | 3 Bed House141, Brook Street, Treorchy, CF42 5SF141, Brook Street, Treorchy, CF42 5SF
• Sold Oct 2024£100,000 | 3 Bed House131, Brook Street, Treorchy, CF42 5SF131, Brook Street, Treorchy, CF42 5SF
• Sold Oct 2024£110,000 | 3 Bed House4, Upper St. Albans Road, Treorchy, CF42 5SR4, Upper St. Albans Road, Treorchy, CF42 5SR
• Sold Dec 2023£64,500 | 3 Bed House23, Halifax Terrace, Treorchy, CF42 5SU23, Halifax Terrace, Treorchy, CF42 5SU
• Sold Sep 2022£67,000 | 3 Bed House114, Brook Street, Treorchy, CF42 5SF114, Brook Street, Treorchy, CF42 5SF
• Sold Apr 2022£63,000 | 3 Bed House6, New Street, Treorchy, CF42 5NF6, New Street, Treorchy, CF42 5NF
• Sold Mar 2022£72,000 | 3 Bed House15, Castleton Avenue, Treorchy, CF42 5SS15, Castleton Avenue, Treorchy, CF42 5SS
• Sold Oct 2021£147,000 | 3 Bed House139, Brook Street, Treorchy, CF42 5SF139, Brook Street, Treorchy, CF42 5SF
• Sold Sep 2021£89,500 | 3 Bed House113, Brook Street, Treorchy, CF42 5SF113, Brook Street, Treorchy, CF42 5SF
• Sold Jun 2021£115,000 | 3 Bed House127, Brook Street, Treorchy, CF42 5SF127, Brook Street, Treorchy, CF42 5SF
• Sold Dec 2019£75,500 | 3 Bed House10, Clyngwyn Road, Treorchy, CF42 5SL10, Clyngwyn Road, Treorchy, CF42 5SL
• Sold Jan 2019£55,000 | 3 Bed House126, Brook Street, Treorchy, CF42 5SF126, Brook Street, Treorchy, CF42 5SF

Of the 30 addresses on Castleton Avenue, Treherbert, Treorchy, CF42, 18, Castleton Avenue, Treorchy comes out as the 21st largest and the 25th most expensive in our analysis of the public data.

It is also £31k less expensive than the average property across the CF42 district.

• Treherbert

  |

  1.6 km away
• Ynyswen

  |

  2.8 km away
• Treorchy

  |

  4.2 km away

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