According to data from HM Land Registry, 35, Seymour Street, Mountain Ash sits on a plot of 120 m².

We have plot size data on 42 out of 44 other houses in the postcode and 35, Seymour Street, Mountain Ash sits on the 24th largest plot.

35, Seymour Street, Mountain Ash has an Energy Performance Rating (EPC) of E. This is based on the most recent assessment, dated 09 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).

According to HM Land Registry, 35, Seymour Street, Mountain Ash was last sold on 8th April 2020 for £93,500 and was recorded as a freehold house.

The property has had 2 sales since 1995.

Since April 2020, the market for similar properties has risen by 51.7%.

• Sold Apr 2020£93,500
• Sold Dec 2002£22,105

According to the Land Registry and our network of Estate Agents, there have been 67 sales of properties similar to 35, Seymour Street, Mountain Ash within a radius of 610 metres since 2018.

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

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 Jun 2025£95,000 | 3 Bed House33, Duffryn Street, Mountain Ash, CF45 3NU33, Duffryn Street, Mountain Ash, CF45 3NU
• Sold Apr 2025£120,000 | 3 Bed House22, Allen Street, Mountain Ash, CF45 4BD22, Allen Street, Mountain Ash, CF45 4BD
• Sold Apr 2024£81,000 | 3 Bed House28, Duffryn Street, Mountain Ash, CF45 3NU28, Duffryn Street, Mountain Ash, CF45 3NU
• Sold Dec 2023£100,000 | 3 Bed House82, Phillip Street, Mountain Ash, CF45 4BG82, Phillip Street, Mountain Ash, CF45 4BG
• Sold Dec 2023£56,500 | 3 Bed House58A, Duffryn Street, Mountain Ash, CF45 3HR58A, Duffryn Street, Mountain Ash, CF45 3HR
• Sold Oct 2023£125,100 | 3 Bed House21, Phillip Street, Mountain Ash, CF45 4BE21, Phillip Street, Mountain Ash, CF45 4BE
• 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 May 2022£92,500 | 3 Bed House16, Copley Street, Mountain Ash, CF45 4AS16, Copley Street, Mountain Ash, CF45 4AS
• Sold Apr 2022£106,000 | 3 Bed House16, Allen Street, Mountain Ash, CF45 4BD16, Allen Street, Mountain Ash, CF45 4BD
• Sold Nov 2021£63,250 | 3 Bed House34, Seymour Street, Mountain Ash, CF45 4BL34, Seymour Street, Mountain Ash, CF45 4BL
• Sold Nov 2021£68,500 | 3 Bed House19, London Street, Mountain Ash, CF45 4BN19, London Street, Mountain Ash, CF45 4BN
• Sold Sep 2021£90,000 | 3 Bed House85, Phillip Street, Mountain Ash, CF45 4BG85, Phillip Street, Mountain Ash, CF45 4BG
• Sold May 2021£65,500 | 2 Bed House13, Allen Street, Mountain Ash, CF45 4BD13, Allen Street, Mountain Ash, CF45 4BD
• Sold Feb 2021£83,000 | 3 Bed House27, Seymour Street, Mountain Ash, CF45 4BL27, Seymour Street, Mountain Ash, CF45 4BL
• Sold Nov 2020£55,000 | 3 Bed House46, Phillip Street, Mountain Ash, CF45 4BG46, Phillip Street, Mountain Ash, CF45 4BG
• Sold Apr 2020£58,000 | 3 Bed House4, Allen Street, Mountain Ash, CF45 4BD4, Allen Street, Mountain Ash, CF45 4BD
• Sold Jan 2020£61,000 | 3 Bed House87, Phillip Street, Mountain Ash, CF45 4BG87, Phillip Street, Mountain Ash, CF45 4BG
• Sold Nov 2018£52,950 | 3 Bed House95, Phillip Street, Mountain Ash, CF45 4BG95, Phillip Street, Mountain Ash, CF45 4BG

Seymour Street, Mountain Ash, CF45 has a total of 44 addresses. According to our analysis of all the public data, 35, Seymour Street, Mountain Ash is the 40th largest and the 40th most expensive property on the street.

When compared to the postcode district it is £51k less expensive than the average property in CF45.

• Mountain Ash

  |

  400 m away
• Fernhill

  |

  1.3 km away
• Penrhiwceiber

  |

  2.0 km away

According to data from the Environment Agency, the flood risk in this area is considered to be Very Low.