According to data from HM Land Registry, 15, Upper William Street, Llanelli sits on a plot of 112 m².

We have plot size data on 14 out of 17 other houses in the postcode and 15, Upper William Street, Llanelli sits on the 11th largest plot.

15, Upper William Street, Llanelli has an Energy Performance Rating (EPC) of E. This is based on the most recent assessment, dated 22 Jun 2017.

The property is connected to mains gas and has fully double glazed windows. It is heated using a boiler and radiators (mains gas).

According to HM Land Registry, 15, Upper William Street, Llanelli was last sold on 20th October 2017 for £67,000 and was recorded as a freehold house.

The property has only had this single sale since 1995.

Since October 2017, the market for similar properties has risen by 107.6%.

• Sold Oct 2017£67,000

According to the Land Registry and our network of Estate Agents, there have been 112 sales of properties similar to 15, Upper William Street, Llanelli within a radius of 460 metres since 2018.

The most recent example is 4, Wern Road, Llanelli, SA15 1SR, a freehold house which sold for £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 2024£87,000 | 3 Bed House21, Swansea Road, Llanelli, SA15 3YT21, Swansea Road, Llanelli, SA15 3YT
• Sold Dec 2024£117,000 | 3 Bed House4, Andrew Street, Llanelli, SA15 3YP4, Andrew Street, Llanelli, SA15 3YP
• Sold Dec 2024£107,000 | 3 Bed House16, Wern Road, Llanelli, SA15 1SR16, Wern Road, Llanelli, SA15 1SR
• Sold Oct 2024£105,000 | 3 Bed House14, Swansea Road, Llanelli, SA15 3YT14, Swansea Road, Llanelli, SA15 3YT
• Sold Aug 2024£112,000 | 3 Bed House3, Marble Hall Road, Llanelli, SA15 1NN3, Marble Hall Road, Llanelli, SA15 1NN
• Sold Jan 2024£72,000 | 3 Bed House94, Swansea Road, Llanelli, SA15 3BJ94, Swansea Road, Llanelli, SA15 3BJ
• Sold Sep 2023£88,000 | 3 Bed House61, Wern Road, Llanelli, SA15 1SP61, Wern Road, Llanelli, SA15 1SP
• Sold Aug 2023£90,000 | 3 Bed House62, Wern Road, Llanelli, SA15 1SR62, Wern Road, Llanelli, SA15 1SR
• Sold Jul 2023£80,000 | 3 Bed House7, Marble Hall Road, Llanelli, SA15 1NN7, Marble Hall Road, Llanelli, SA15 1NN
• Sold Mar 2023£90,000 | 3 Bed House20, Upper William Street, Llanelli, SA15 1SL20, Upper William Street, Llanelli, SA15 1SL
• Sold Mar 2023£105,000 | 3 Bed House21, Upper William Street, Llanelli, SA15 1SL21, Upper William Street, Llanelli, SA15 1SL
• Sold Mar 2022£80,000 | 3 Bed House23, Wern Road, Llanelli, SA15 1SP23, Wern Road, Llanelli, SA15 1SP
• Sold May 2021£79,000 | 3 Bed House13, Als Street, Llanelli, SA15 1SN13, Als Street, Llanelli, SA15 1SN
• Sold May 2021£100,000 | 3 Bed House15, Als Street, Llanelli, SA15 1SN15, Als Street, Llanelli, SA15 1SN
• Sold Feb 2019£80,000 | 3 Bed House76, Wern Road, Llanelli, SA15 1SR76, Wern Road, Llanelli, SA15 1SR
• Sold Jan 2019£69,000 | 3 Bed House11, Marble Hall Road, Llanelli, SA15 1NN11, Marble Hall Road, Llanelli, SA15 1NN
• Sold Aug 2018£68,750 | 3 Bed House55, Wern Road, Llanelli, SA15 1SP55, Wern Road, Llanelli, SA15 1SP

Upper William Street, Llanelli, SA15 has a total of 17 addresses. According to our analysis of all the public data, 15, Upper William Street, Llanelli is the 11th largest and the 11th most expensive property on the street.

When compared to the postcode district it is £78k less expensive than the average property in SA15.

• Llanelli

  |

  1.0 km away
• Bynea

  |

  4.1 km away
• Llangennech

  |

  5.4 km away

According to data from the Environment Agency, the flood risk in this area is considered to be Very Low.