23, William Street, Caerphilly occupies a 108 m² plot as recorded by HM Land Registry.

Of the 42 other houses in this postcode, 37 have recorded plot sizes, and this one ranks as the 30th largest.

23, William Street, Caerphilly has an Energy Performance Rating (EPC) of E. This is based on the most recent assessment, dated 18 Dec 2013.

The property is not connected to mains gas and has fully double glazed windows. It is heated using a boiler and radiators (mains gas).

23, William Street, Caerphilly last changed hands on 15th August 2011, selling for £95,000. The transaction was logged as a freehold house by HM Land Registry.

In total it has sold 4 times since 1995.

The market for similar properties has risen by 127.2% since August 2011.

• Sold Aug 2011£95,000
• Sold May 2010£115,000
• Sold Jan 1999£36,300

Land Registry records and our Estate Agent network show 203 sales of comparable properties within 1.1 kilometres of 23, William Street, Caerphilly since 2019.

Most recently, 44, Mary Street, Caerphilly, CF83 8HN, a freehold house, sold at £170,000 on the 23rd February 2026.

Read more about house prices in CF83.

• Sold Feb 2026£170,000 | 3 Bed House44, Mary Street, Caerphilly, CF83 8HN44, Mary Street, Caerphilly, CF83 8HN
• Sold Dec 2025£205,000 | 3 Bed House26, William Street, Caerphilly, CF83 8DQ26, William Street, Caerphilly, CF83 8DQ
• Sold Dec 2025£172,000 | 3 Bed House66, James Street, Caerphilly, CF83 8FY66, James Street, Caerphilly, CF83 8FY
• Sold Oct 2025£154,000 | 3 Bed House6, William Street, Caerphilly, CF83 8DQ6, William Street, Caerphilly, CF83 8DQ
• Sold Jul 2025£162,000 | 4 Bed House56, William Street, Caerphilly, CF83 8FX56, William Street, Caerphilly, CF83 8FX
• Sold Jun 2025£155,000 | 3 Bed House11, Thomas Street, Caerphilly, CF83 8DP11, Thomas Street, Caerphilly, CF83 8DP
• Sold Apr 2025£147,000 | 3 Bed House8, Thomas Street, Caerphilly, CF83 8DP8, Thomas Street, Caerphilly, CF83 8DP
• Sold Dec 2024£168,650 | 3 Bed House30, Thomas Street, Caerphilly, CF83 8DP30, Thomas Street, Caerphilly, CF83 8DP
• Sold Nov 2024£149,500 | 3 Bed House34, Thomas Street, Caerphilly, CF83 8DP34, Thomas Street, Caerphilly, CF83 8DP
• Sold Oct 2024£160,000 | 3 Bed House13, William Street, Caerphilly, CF83 8DQ13, William Street, Caerphilly, CF83 8DQ
• Sold Sep 2024£163,500 | 3 Bed House20, Mary Street, Caerphilly, CF83 8HN20, Mary Street, Caerphilly, CF83 8HN
• Sold Aug 2024£157,000 | 3 Bed House41, William Street, Caerphilly, CF83 8DQ41, William Street, Caerphilly, CF83 8DQ
• Sold Aug 2024£180,000 | 3 Bed House48, Thomas Street, Caerphilly, CF83 8DP48, Thomas Street, Caerphilly, CF83 8DP
• Sold Feb 2024£150,000 | 3 Bed House6, Mary Street, Caerphilly, CF83 8HN6, Mary Street, Caerphilly, CF83 8HN
• Sold Nov 2023£153,000 | 3 Bed House49, William Street, Caerphilly, CF83 8DQ49, William Street, Caerphilly, CF83 8DQ
• Sold Aug 2023£187,500 | 3 Bed House19, Mary Street, Caerphilly, CF83 8HN19, Mary Street, Caerphilly, CF83 8HN
• Sold Nov 2022£161,000 | 3 Bed House9, William Street, Caerphilly, CF83 8DQ9, William Street, Caerphilly, CF83 8DQ
• Sold Apr 2022£138,500 | 3 Bed House31, Mary Street, Caerphilly, CF83 8HN31, Mary Street, Caerphilly, CF83 8HN
• Sold Sep 2021£158,000 | 3 Bed House50, Mary Street, Caerphilly, CF83 8HN50, Mary Street, Caerphilly, CF83 8HN
• Sold Aug 2019£100,000 | 3 Bed House19, Thomas Street, Caerphilly, CF83 8DP19, Thomas Street, Caerphilly, CF83 8DP

Our analysis of the public data ranks 23, William Street, Caerphilly as the 17th largest and the 21st most expensive of the 71 addresses on William Street, Trethomas, Caerphilly, CF83.

Against the CF83 postcode district average, it is £46k less expensive than the typical property.

• Caerphilly

  |

  3.5 km away
• Energlyn & Churchill Park

  |

  3.5 km away
• Llanbradach

  |

  3.8 km away

Environment Agency data suggests this area has a Very Low risk of flooding.