Our Data Sources
12, Sunnyside, Mountain Ash has a single entry in the Land Registry from September 2017 and a single entry in the EPC database dated October 2012.
We combine this information with that 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.
Price Range & Condition
The condition of a property plays an important role in determining its value, with the degree of impact varying by property type, size and location.
For 12, Sunnyside, Mountain Ash, we estimate a market value of £131,965 and a rental value of £849 per month when presented in very good decorative order. Should the property require extensive cosmetic improvement, those figures would reduce to £116,883 and £752 per month respectively.
Plot Size
HM Land Registry records the plot of land for 12, Sunnyside, Mountain Ash as measuring 450 m2.
That makes it the largest plot in the postcode, where 15 of the 19 other houses have recorded plot data.
Energy Efficiency
12, Sunnyside, Mountain Ash has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 24 Oct 2012.
The property is not connected to mains gas and has fully double glazed windows. It is heated using Boiler and radiators, mains gas.
Sold Prices
The most recent sale of 12, Sunnyside, Mountain Ash completed on 29th September 2017 at £110,000 and was recorded by HM Land Registry as a freehold house.
Since 1995 this is the property's only sale.
Values of comparable properties have risen by 156.2% over the period since September 2017.
- Sold Sep 2017£110,000
Similar Properties Sold Nearby
Over the past 2 years 193 properties similar to 12, Sunnyside, Mountain Ash have sold within a radius of 1.6 kilometres, per the Land Registry and our network of Estate Agents.
The latest, on the 22nd April 2026, was 10, Pentwyn Avenue, Mountain Ash, CF45 4YF, a freehold house which sold for £83,000.
Read more about house prices in CF45.
- Sold Apr 2026£83,000 | 3 Bed House10, Pentwyn Avenue, Mountain Ash, CF45 4YF10, Pentwyn Avenue, Mountain Ash, CF45 4YF
- Sold May 2025£117,500 | 3 Bed House24, Pentwyn Avenue, Mountain Ash, CF45 4YF24, Pentwyn Avenue, Mountain Ash, CF45 4YF
- Sold Aug 2022£95,000 | 3 Bed House13, Sunnyside, Mountain Ash, CF45 4DJ13, Sunnyside, Mountain Ash, CF45 4DJ
•Nearby is defined as the radius comprising the nearest 2,000 addresses.
More reading links
Location Comparison
Of the 19 addresses on Sunnyside, Abercynon, Mountain Ash, CF45, 12, Sunnyside, Mountain Ash comes out as the 15th largest and the 13th most expensive in our analysis of the public data.
It is also £35k less expensive than the average property across the CF45 district.
More reading links
Schools Nearby
Public Transport Nearby
- Penrhiwceiber|1.4 km away
- Quakers Yard|1.6 km away
- Abercynon|2.2 km away
Available Internet Speeds
Broadband here reaches superfast speeds, based on recent Ofcom data.
According to recent data from Ofcom, Superfast Broadband is available in the area.
Risk of Flooding
The flood risk here is rated Very Low, based on Environment Agency data.
