Our Data Sources
17, Upper William Street, Llanelli has a single entry in the Land Registry from May 2016 and a single entry in the EPC database dated May 2026.
We combine this information with that 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
In very good condition, we estimate 17, Upper William Street, Llanelli would be worth £115,940, with a potential rental value of £789 per month.
If substantial cosmetic improvements are needed, the estimated sale value falls to £102,689, with a rental value of £698 per month.
The extent to which decoration affects a property's value depends on its type, size and location.
Plot Size
17, Upper William Street, Llanelli occupies a 105 m2 plot as recorded by HM Land Registry.
Of the 17 other houses in this postcode, 14 have recorded plot sizes, and this one ranks as the 12th largest.
Energy Efficiency
17, Upper William Street, Llanelli has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 12 May 2026.
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
17, Upper William Street, Llanelli last changed hands on 27th May 2016, selling for £57,000. The transaction was logged as a freehold house by HM Land Registry.
That is its only recorded sale since 1995.
The market for similar properties has risen by 125.6% since May 2016.
- Sold May 2016£57,000
Similar Properties Sold Nearby
Land Registry records and our Estate Agent network show 90 sales of comparable properties within 460 metres of 17, Upper William Street, Llanelli since 2018.
Most recently, 4, Wern Road, Llanelli, SA15 1SR, a freehold house, sold at £130,000 on the 29th April 2026.
Read more about house prices in SA15.
- Sold Apr 2026£130,000 | 3 Bed House4, Wern Road, Llanelli, SA15 1SR4, Wern Road, Llanelli, SA15 1SR
- Sold Feb 2026£69,500 | 3 Bed House6, Cae Du Bach, Llanelli, SA15 3AQ6, Cae Du Bach, Llanelli, SA15 3AQ
- Sold Jan 2026£96,600 | 3 Bed House5, Pottery Place, Llanelli, SA15 1ST5, Pottery Place, Llanelli, SA15 1ST
- Sold Dec 2025£114,000 | 3 Bed House24, Swansea Road, Llanelli, SA15 3YT24, Swansea Road, Llanelli, SA15 3YT
- Sold Dec 2024£87,000 | 3 Bed House21, Swansea Road, Llanelli, SA15 3YT21, Swansea Road, Llanelli, SA15 3YT
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 £126,220, ranging from £67,216 to £192,290.
- 18 Upper William Street
3 Bed House | 4 m | Est. Value: £132,600
- 15 Upper William Street
3 Bed House | 8 m | Est. Value: £112,062
- 20 Upper William Street
3 Bed House | 14 m | Est. Value: £109,588
- 21 Upper William Street
3 Bed House | 19 m | Est. Value: £115,279
- 2 College Square
4 Bed House | 20 m | Est. Value: £188,090
Location Comparison
Our analysis of the public data ranks 17, Upper William Street, Llanelli as the 13th largest and the 13th most expensive of the 17 addresses on Upper William Street, Llanelli, SA15.
Against the SA15 postcode district average, it is £80k less expensive than the typical property.
More reading links
Schools Nearby
Public Transport Nearby
- Llanelli|1.0 km away
- Bynea|4.1 km away
- Llangennech|5.4 km away
Available Internet Speeds
Ofcom's latest figures show superfast broadband available in this area.
According to recent data from Ofcom, Superfast Broadband available in this area.
Risk of Flooding
Environment Agency data suggests this area has a Very Low risk of flooding.
