21, Heol Isaf, Treharris occupies a 362 m² plot as recorded by HM Land Registry.

All 35 other houses in this postcode have recorded plot sizes, and this one ranks as the 12th largest.

21, Heol Isaf, Treharris has an Energy Performance Rating (EPC) of E. This is based on the most recent assessment, dated 21 Jul 2011.

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

21, Heol Isaf, Treharris last changed hands on 18th August 2014, selling for £156,000. The transaction was logged as a freehold house by HM Land Registry.

In total it has sold 3 times since 1995.

The market for similar properties has risen by 18.6% since August 2014.

• Sold Aug 2014£156,000
• Sold Jul 2005£143,000
• Sold Sep 1997£59,000

Land Registry records and our Estate Agent network show 168 sales of comparable properties within 1.1 kilometres of 21, Heol Isaf, Treharris since 2014.

Most recently, 24, Heol Isaf, Treharris, CF46 6NS, a freehold house, sold at £240,000 on the 18th March 2026.

Read more about house prices in CF46.

• Sold Mar 2026£240,000 | 3 Bed House24, Heol Isaf, Treharris, CF46 6NS24, Heol Isaf, Treharris, CF46 6NS
• Sold Jan 2026£172,500 | 3 Bed House41, Beech Tree Way, Treharris, CF46 6NU41, Beech Tree Way, Treharris, CF46 6NU
• Sold Oct 2025£335,000 | 3 Bed House12, Heol Uchaf, Treharris, CF46 6NT12, Heol Uchaf, Treharris, CF46 6NT
• Sold Oct 2025£255,000 | 3 Bed House49, Beech Tree Way, Treharris, CF46 6NU49, Beech Tree Way, Treharris, CF46 6NU
• Sold Aug 2025£260,000 | 3 Bed House14, Heol Uchaf, Treharris, CF46 6NT14, Heol Uchaf, Treharris, CF46 6NT
• Sold Apr 2025£227,000 | 3 Bed House45, Ashgrove Terrace, Treharris, CF46 6LS45, Ashgrove Terrace, Treharris, CF46 6LS
• Sold Nov 2024£200,000 | 3 Bed House16, Beech Tree Way, Treharris, CF46 6NU16, Beech Tree Way, Treharris, CF46 6NU
• Sold May 2024£160,000 | 3 Bed House12, Mountain Way, Treharris, CF46 6NY12, Mountain Way, Treharris, CF46 6NY
• Sold Nov 2023£213,675 | 3 Bed House21, Ashgrove Terrace, Treharris, CF46 6LS21, Ashgrove Terrace, Treharris, CF46 6LS
• Sold Oct 2022£200,000 | 3 Bed House2, Beech Tree Way, Treharris, CF46 6NU2, Beech Tree Way, Treharris, CF46 6NU
• Sold Oct 2022£78,000 | 3 Bed House8, Heol Isaf, Treharris, CF46 6NS8, Heol Isaf, Treharris, CF46 6NS
• Sold Sep 2022£245,000 | 3 Bed House15, Heol Isaf, Treharris, CF46 6NS15, Heol Isaf, Treharris, CF46 6NS
• Sold Sep 2022£245,000 | 3 Bed House25, Heol Uchaf, Treharris, CF46 6NT25, Heol Uchaf, Treharris, CF46 6NT
• Sold Aug 2022£212,000 | 3 Bed House11, Heol Isaf, Treharris, CF46 6NS11, Heol Isaf, Treharris, CF46 6NS
• Sold Aug 2022£229,950 | 3 Bed House9, Beech Tree Way, Treharris, CF46 6NU9, Beech Tree Way, Treharris, CF46 6NU
• Sold Apr 2022£225,000 | 2 Bed House15, Beech Tree Way, Treharris, CF46 6NU15, Beech Tree Way, Treharris, CF46 6NU
• Sold May 2021£175,000 | 3 Bed House20, Mountain Way, Treharris, CF46 6NY20, Mountain Way, Treharris, CF46 6NY
• Sold Mar 2021£204,000 | 3 Bed House6, Heol Isaf, Treharris, CF46 6NS6, Heol Isaf, Treharris, CF46 6NS
• Sold Sep 2017£145,000 | 3 Bed House29, Heol Isaf, Treharris, CF46 6NS29, Heol Isaf, Treharris, CF46 6NS
• Sold May 2014£125,000 | 3 Bed House20, Heol Isaf, Treharris, CF46 6NS20, Heol Isaf, Treharris, CF46 6NS

Our analysis of the public data ranks 21, Heol Isaf, Treharris as the 24th largest and the 25th most expensive of the 35 addresses on Heol Isaf, Nelson, Treharris, CF46.

Against the CF46 postcode district average, it is £78k more expensive than the typical property.

• Ystrad Mynach

  |

  2.7 km away
• Quakers Yard

  |

  3.4 km away
• Abercynon

  |

  3.4 km away

Environment Agency data suggests this area has a Very Low risk of flooding.