Our Data Sources
20, William Street, Mountain Ash has a single entry in the Land Registry from September 2024 and a single entry in the EPC database dated October 2021.
We combine this information with that of neighbouring properties to estimate the property attributes and values.
The local information is scored as 4 out of 5 and is considered of high 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 20, William Street, Mountain Ash, we estimate a market value of £179,246 and a rental value of £943 per month when presented in very good decorative order. Should the property require extensive cosmetic improvement, those figures would reduce to £158,761 and £836 per month respectively.
Plot Size
HM Land Registry records the plot of land for 20, William Street, Mountain Ash as measuring 117 m2.
That makes it the 16th largest plot in the postcode, where 27 of the 33 other houses have recorded plot data.
Energy Efficiency
20, William Street, Mountain Ash has an Energy Performance Rating (EPC) of C. This is based on the most recent assessment, dated 25 Oct 2021.
The property is 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 20, William Street, Mountain Ash completed on 13th September 2024 at £98,000 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 5.3% over the period since September 2024.
- Sold Sep 2024£98,000
Similar Properties Sold Nearby
Over the past 2 years 166 properties similar to 20, William Street, Mountain Ash have sold within a radius of 1.3 kilometres, per the Land Registry and our network of Estate Agents.
The latest, on the 12th March 2026, was 14, New Street, Mountain Ash, CF45 4NR, a freehold house which sold for £120,000.
Read more about house prices in CF45.
- Sold Mar 2026£120,000 | 3 Bed House14, New Street, Mountain Ash, CF45 4NR14, New Street, Mountain Ash, CF45 4NR
- Sold Aug 2025£179,950 | 3 Bed House13, New Street, Mountain Ash, CF45 4NR13, New Street, Mountain Ash, CF45 4NR
- Sold Sep 2024£167,000 | 3 Bed House29, William Street, Mountain Ash, CF45 4RW29, William Street, Mountain Ash, CF45 4RW
•Nearby is defined as the radius comprising the nearest 2,000 addresses.
More reading links
Location Comparison
Of the 33 addresses on William Street, Abercynon, Mountain Ash, CF45, 20, William Street, Mountain Ash comes out as the 4th largest and the 4th most expensive in our analysis of the public data.
It is also £10k more expensive than the average property across the CF45 district.
More reading links
Schools Nearby
Public Transport Nearby
- Abercynon|200 m away
- Quakers Yard|1.9 km away
- Penrhiwceiber|3.6 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.
