Our Data Sources
12, Union Street, Mountain Ash has no recent1 records in the Land Registry and a single entry in the EPC database dated November 2017.
We combine this information with public data of neighbouring properties to estimate the property attributes and values.
The local information is scored as 1 out of 5 and is considered of low accuracy.
1Sales dated prior to 2007 are shown, but are not used in our calculations.
Price Range & Condition
In very good condition, we estimate 12, Union Street, Mountain Ash would be worth £57,977, with a potential rental value of £439 per month.
If substantial cosmetic improvements are needed, the estimated sale value falls to £51,351, with a rental value of £389 per month.
The extent to which decoration affects a property's value depends on its type, size and location.
Plot Size
12, Union Street, Mountain Ash occupies a 44 m2 plot as recorded by HM Land Registry.
Of the 11 other houses in this postcode, 8 have recorded plot sizes, and this one ranks as the 5th largest.
Energy Efficiency
12, Union Street, Mountain Ash has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 14 Nov 2017.
The property is connected to mains gas and has fully double glazed windows. It is heated using a boiler and radiators (mains gas).
Sold Prices
12, Union Street, Mountain Ash last changed hands on 11th April 2003, selling for £25,000. The transaction was logged as a freehold house by HM Land Registry.
That is its only recorded sale since 1995.
- Sold Apr 2003£25,000
Similar Properties Sold Nearby
Land Registry records and our Estate Agent network show 8 sales of comparable properties within 510 metres of 12, Union Street, Mountain Ash since 2014.
Most recently, 9, Union Street, Mountain Ash, CF45 3NY, a freehold house, sold at £90,000 on the 24th October 2025.
Read more about house prices in CF45.
- Sold Oct 2025£90,000 | 3 Bed House9, Union Street, Mountain Ash, CF45 3NY9, Union Street, Mountain Ash, CF45 3NY
- Sold Nov 2020£50,000 | 2 Bed House61, High Street, Mountain Ash, CF45 3PE61, High Street, Mountain Ash, CF45 3PE
- Sold Sep 2020£53,000 | 2 Bed House54, High Street, Mountain Ash, CF45 3PE54, High Street, Mountain Ash, CF45 3PE
- Sold Jan 2020£36,000 | 2 Bed House62, High Street, Mountain Ash, CF45 3PE62, High Street, Mountain Ash, CF45 3PE
- Sold Oct 2019£43,750 | 3 Bed House8, Union Street, Mountain Ash, CF45 3NY8, Union Street, Mountain Ash, CF45 3NY
Nearby is defined as the radius comprising the nearest 2,000 addresses.
More reading links
Explore Nearby Properties
The surrounding properties have an average estimated value of £84,754, ranging from £52,496 to £109,982.
- 11 Union Street
3 Bed House | 4 m | Est. Value: £68,479
- 13 Union Street
2 Bed House | 6 m | Est. Value: £52,496
- 29 Duffryn Street
2 Bed House | 8 m | Est. Value: £84,277
- 10 Union Street
3 Bed House | 9 m | Est. Value: £66,558
- 31 Duffryn Street
3 Bed House | 12 m | Est. Value: £106,543
Location Comparison
Our analysis of the public data ranks 12, Union Street, Mountain Ash as the 8th largest and the 8th most expensive of the 11 addresses on Union Street, Mountain Ash, CF45.
Against the CF45 postcode district average, it is £105k less expensive than the typical property.
More reading links
Schools Nearby
Public Transport Nearby
- Mountain Ash|400 m away
- Fernhill|1.1 km away
- Penrhiwceiber|2.1 km away
Risk of Flooding
Environment Agency data suggests this area has a Very Low risk of flooding.
