Our Data Sources
23, William Street, Mountain Ash has 2 entries in the Land Registry , most recently in May 2025 and a single entry in the EPC database dated November 2024.
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
Decorative condition can have a big effect on a property's value and this effect varies depending on the type, size and location of the property.
If 23, William Street, Mountain Ash is in very good condition we estimate a sale value of £162,435 and a rental value of £921 per month.
However, if the property needs a lot of cosmetic work we estimate a sale value of £143,871 and a rental value of £815 per month.
Plot Size
According to data from HM Land Registry, 23, William Street, Mountain Ash sits on a plot of 116 m2.
We have plot size data on 27 out of 33 other houses in the postcode and 23, William Street, Mountain Ash sits on the 17th largest plot.
Energy Efficiency
23, William Street, Mountain Ash has an Energy Performance Rating (EPC) of C. This is based on the most recent assessment, dated 14 Nov 2024.
The property is connected to mains gas and has fully double glazed windows. It is heated using Boiler and radiators, mains gas.
Sold Prices
According to HM Land Registry, 23, William Street, Mountain Ash was last sold on 8th May 2025 for £155,000 and was recorded as a freehold house.
The property has had 2 sales since 1995.
Since May 2025, the market for similar properties has risen by 2.9%.
- Sold May 2025£155,000
- Sold Feb 2017£77,000
Similar Properties Sold Nearby
According to the Land Registry and our network of Estate Agents, there have been 286 sales of properties similar to 23, William Street, Mountain Ash within a radius of 1.3 kilometres over the last 2 years.
The most recent example is 10, William Street, Mountain Ash, CF45 4RW, a freehold house which sold for £159,995 on the 21st April 2023.
Read more about house prices in CF45.
- Sold Apr 2023£159,995 | 3 Bed House10, William Street, Mountain Ash, CF45 4RW10, William Street, Mountain Ash, CF45 4RW
- Sold Nov 2022£144,950 | 3 Bed House19, William Street, Mountain Ash, CF45 4RW19, William Street, Mountain Ash, CF45 4RW
- Sold Sep 2021£130,000 | 3 Bed House24, William Street, Mountain Ash, CF45 4RW24, William Street, Mountain Ash, CF45 4RW
•Nearby is defined as the radius comprising the nearest 2,000 addresses.
More reading links
Location Comparison
William Street, Abercynon, Mountain Ash, CF45 has a total of 33 addresses. According to our analysis of all the public data, 23, William Street, Mountain Ash is the 21st largest and the 21st most expensive property on the street.
When compared to the postcode district it is £6k less expensive than the average property in CF45.
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
According to recent data from Ofcom, Superfast Broadband is available in this area.
According to recent data from Ofcom, Superfast Broadband is available in the area.
Risk of Flooding
According to data from the Environment Agency, the flood risk in this area is considered to be Very Low.
