HM Land Registry records the plot of land for 13, Seymour Street, Mountain Ash as measuring 116 m².

That makes it the 33rd largest plot in the postcode, where 42 of the 44 other houses have recorded plot data.

13, Seymour Street, Mountain Ash has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 13 May 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 2016 28 properties similar to 13, Seymour Street, Mountain Ash have sold within a radius of 560 metres, per the Land Registry and our network of Estate Agents.

The latest, on the 10th June 2026, was 15, Cliff Street, Mountain Ash, CF45 3LE, a freehold house which sold for £103,000.

Read more about house prices in CF45.

• Sold Jun 2026£103,000 | 3 Bed House15, Cliff Street, Mountain Ash, CF45 3LE15, Cliff Street, Mountain Ash, CF45 3LE
• Sold Nov 2025£60,000 | 3 Bed House32, Napier Street, Mountain Ash, CF45 3HW32, Napier Street, Mountain Ash, CF45 3HW
• Sold Jan 2025£225,000 | 3 Bed House115, High Street, Mountain Ash, CF45 3LN115, High Street, Mountain Ash, CF45 3LN
• Sold Dec 2024£115,000 | 3 Bed House19, Pryce Street, Mountain Ash, CF45 3NT19, Pryce Street, Mountain Ash, CF45 3NT
• Sold Jul 2024£63,000 | 3 Bed House28, Napier Street, Mountain Ash, CF45 3HW28, Napier Street, Mountain Ash, CF45 3HW
• Sold Dec 2023£100,000 | 3 Bed House82, Phillip Street, Mountain Ash, CF45 4BG82, Phillip Street, Mountain Ash, CF45 4BG
• Sold Oct 2023£78,500 | 3 Bed House30, Napier Street, Mountain Ash, CF45 3HW30, Napier Street, Mountain Ash, CF45 3HW
• Sold Sep 2023£100,000 | 3 Bed House1, St. Davids Place, Mountain Ash, CF45 3NN1, St. Davids Place, Mountain Ash, CF45 3NN
• Sold Mar 2023£110,000 | 3 Bed House45, Arnold Street, Mountain Ash, CF45 4LF45, Arnold Street, Mountain Ash, CF45 4LF
• Sold Jul 2022£75,000 | 3 Bed House24A, Allen Street, Mountain Ash, CF45 4BD24A, Allen Street, Mountain Ash, CF45 4BD
• Sold Apr 2022£60,000 | 3 Bed House2, Commercial Street, Mountain Ash, CF45 3PS2, Commercial Street, Mountain Ash, CF45 3PS
• Sold Sep 2021£90,000 | 3 Bed House85, Phillip Street, Mountain Ash, CF45 4BG85, Phillip Street, Mountain Ash, CF45 4BG
• Sold Jun 2021£78,000 | 3 Bed House26, Duffryn Street, Mountain Ash, CF45 3NU26, Duffryn Street, Mountain Ash, CF45 3NU
• Sold May 2021£65,500 | 2 Bed House13, Allen Street, Mountain Ash, CF45 4BD13, Allen Street, Mountain Ash, CF45 4BD
• Sold Mar 2021£72,500 | 3 Bed House36, Napier Street, Mountain Ash, CF45 3HW36, Napier Street, Mountain Ash, CF45 3HW
• Sold Nov 2020£55,000 | 3 Bed House46, Phillip Street, Mountain Ash, CF45 4BG46, Phillip Street, Mountain Ash, CF45 4BG
• Sold Nov 2020£54,000 | 3 Bed House15, Stream Street, Mountain Ash, CF45 3LL15, Stream Street, Mountain Ash, CF45 3LL
• Sold Apr 2020£93,500 | 3 Bed House35, Seymour Street, Mountain Ash, CF45 4BL35, Seymour Street, Mountain Ash, CF45 4BL
• Sold Jan 2020£61,000 | 3 Bed House87, Phillip Street, Mountain Ash, CF45 4BG87, Phillip Street, Mountain Ash, CF45 4BG
• Sold Aug 2016£59,000 | 3 Bed House8, Napier Street, Mountain Ash, CF45 3HW8, Napier Street, Mountain Ash, CF45 3HW

Of the 44 addresses on Seymour Street, Mountain Ash, CF45, 13, Seymour Street, Mountain Ash comes out as the 43rd largest and the 43rd most expensive in our analysis of the public data.

It is also £58k less expensive than the average property across the CF45 district.

• Mountain Ash

  |

  400 m away
• Fernhill

  |

  1.3 km away
• Penrhiwceiber

  |

  2.0 km away

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