Our Data Sources
21, William Street, Swansea has no records in the the Land Registry and a single entry in the EPC database dated August 2025.
We combine this information with public data of neighbouring properties to estimate the property attributes and values.
The local information is scored as 3 out of 5 and is considered of medium 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 21, William Street, Swansea, we estimate a market value of £221,748 and a rental value of £897 per month when presented in very good decorative order. Should the property require extensive cosmetic improvement, those figures would reduce to £196,405 and £795 per month respectively.
Plot Size
HM Land Registry records the plot of land for 21, William Street, Swansea as measuring 107 m2.
That makes it the 19th largest plot in the postcode, where 30 of the 32 other houses have recorded plot data.
Energy Efficiency
21, William Street, Swansea has an Energy Performance Rating (EPC) of E. This is based on the most recent assessment, dated 05 Aug 2025.
The property is connected to mains gas and has partial double glazing. It is heated using Boiler and radiators, mains gas.
Similar Properties Sold Nearby
Over the past 2 years 87 properties similar to 21, William Street, Swansea have sold within a radius of 470 metres, per the Land Registry and our network of Estate Agents.
The latest, on the 11th July 2025, was 23, Western Street, Swansea, SA1 3JZ, a freehold house which sold for £185,000.
Read more about house prices in SA1.
- Sold Jul 2025£185,000 | 4 Bed House23, Western Street, Swansea, SA1 3JZ23, Western Street, Swansea, SA1 3JZ
- Sold Sep 2024£180,000 | 4 Bed House74, Argyle Street, Swansea, SA1 3TA74, Argyle Street, Swansea, SA1 3TA
- Sold Jul 2024£175,000 | 4 Bed House41, Glamorgan Street, Swansea, SA1 3SY41, Glamorgan Street, Swansea, SA1 3SY
•Nearby is defined as the radius comprising the nearest 2,000 addresses.
More reading links
Location Comparison
Of the 62 addresses on William Street, Swansea, SA1, 21, William Street, Swansea comes out as the largest and the most expensive in our analysis of the public data.
It is also £60k more expensive than the average property across the SA1 district.
More reading links
Schools Nearby
Public Transport Nearby
- Swansea|1.1 km away
- Llansamlet|6.7 km away
- Gowerton|7.0 km away
Available Internet Speeds
Broadband here reaches ultrafast speeds, based on recent Ofcom data.
According to recent data from Ofcom, Ultrafast Broadband is available in the area.
Risk of Flooding
The flood risk here is rated Very Low, based on Environment Agency data.
