21, Glanlay Street, Mountain Ash occupies a 106 m² plot as recorded by HM Land Registry.

Of the 49 other houses in this postcode, 44 have recorded plot sizes, and this one ranks as the 12th largest.

21, Glanlay Street, Mountain Ash has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 07 Dec 2020.

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

21, Glanlay Street, Mountain Ash last changed hands on 10th September 2010, selling for £45,000. The transaction was logged as a freehold house by HM Land Registry.

In total it has sold twice since 1995.

The market for similar properties has risen by 126.8% since September 2010.

• Sold Sep 2010£45,000
• Sold Aug 1998£25,000

Land Registry records and our Estate Agent network show 47 sales of comparable properties within 1.0 kilometres of 21, Glanlay Street, Mountain Ash since 2010.

Most recently, 22, Station Terrace, Mountain Ash, CF45 3SS, a freehold house, sold at £130,000 on the 28th November 2025.

Read more about house prices in CF45.

• Sold Nov 2025£130,000 | 3 Bed House22, Station Terrace, Mountain Ash, CF45 3SS22, Station Terrace, Mountain Ash, CF45 3SS
• Sold Nov 2025£80,000 | 3 Bed House14, Monmouth Street, Mountain Ash, CF45 3NJ14, Monmouth Street, Mountain Ash, CF45 3NJ
• Sold Oct 2025£115,000 | 3 Bed House30, Glanlay Street, Mountain Ash, CF45 3TL30, Glanlay Street, Mountain Ash, CF45 3TL
• Sold Mar 2025£90,000 | 3 Bed House59, Morris Avenue, Mountain Ash, CF45 3TW59, Morris Avenue, Mountain Ash, CF45 3TW
• Sold Mar 2025£102,000 | 3 Bed House62, Church Street, Mountain Ash, CF45 3YB62, Church Street, Mountain Ash, CF45 3YB
• Sold Sep 2024£99,000 | 3 Bed House65, Morris Avenue, Mountain Ash, CF45 3TW65, Morris Avenue, Mountain Ash, CF45 3TW
• Sold May 2024£90,000 | 3 Bed House59, Church Street, Mountain Ash, CF45 3YB59, Church Street, Mountain Ash, CF45 3YB
• Sold Nov 2023£53,000 | 3 Bed House36, Church Street, Mountain Ash, CF45 3YB36, Church Street, Mountain Ash, CF45 3YB
• Sold Aug 2022£90,000 | 3 Bed House17, Monmouth Street, Mountain Ash, CF45 3NJ17, Monmouth Street, Mountain Ash, CF45 3NJ
• Sold Aug 2022£102,500 | 3 Bed House14A, Rheola Street, Mountain Ash, CF45 3TA14A, Rheola Street, Mountain Ash, CF45 3TA
• Sold Nov 2021£50,000 | 3 Bed House3, Railway Terrace, Mountain Ash, CF45 3ST3, Railway Terrace, Mountain Ash, CF45 3ST
• Sold Jan 2021£56,600 | 3 Bed House51, Church Street, Mountain Ash, CF45 3YB51, Church Street, Mountain Ash, CF45 3YB
• Sold Jan 2021£67,000 | 3 Bed House70, Glanlay Street, Mountain Ash, CF45 3TN70, Glanlay Street, Mountain Ash, CF45 3TN
• Sold Feb 2020£80,000 | 3 Bed House37, Morris Avenue, Mountain Ash, CF45 3TW37, Morris Avenue, Mountain Ash, CF45 3TW
• Sold Mar 2019£77,000 | 3 Bed House85, Glanlay Street, Mountain Ash, CF45 3TN85, Glanlay Street, Mountain Ash, CF45 3TN
• Sold Mar 2018£38,000 | 3 Bed House35, Glanlay Street, Mountain Ash, CF45 3TL35, Glanlay Street, Mountain Ash, CF45 3TL
• Sold Mar 2017£69,995 | 3 Bed House77, Glanlay Street, Mountain Ash, CF45 3TN77, Glanlay Street, Mountain Ash, CF45 3TN
• Sold Feb 2016£30,000 | 3 Bed House6, Glanlay Street, Mountain Ash, CF45 3TL6, Glanlay Street, Mountain Ash, CF45 3TL
• Sold Mar 2012£58,000 | 3 Bed House15A, Rheola Street, Mountain Ash, CF45 3TA15A, Rheola Street, Mountain Ash, CF45 3TA
• Sold Mar 2010£44,210 | 3 Bed House14, Glanlay Street, Mountain Ash, CF45 3TL14, Glanlay Street, Mountain Ash, CF45 3TL

Our analysis of the public data ranks 21, Glanlay Street, Mountain Ash as the 83rd largest and the 54th most expensive of the 87 addresses on Glanlay Street, Mountain Ash, CF45.

Against the CF45 postcode district average, it is £55k less expensive than the typical property.

• Penrhiwceiber

  |

  300 m away
• Mountain Ash

  |

  1.9 km away
• Merthyr Vale

  |

  2.7 km away

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