HM Land Registry records the plot of land for 6, William Street, Caerphilly as measuring 108 m².

That makes it the 31st largest plot in the postcode, where 37 of the 42 other houses have recorded plot data.

6, William Street, Caerphilly has an Energy Performance Rating (EPC) of C. This is based on the most recent assessment, dated 15 Jul 2025.

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

The most recent sale of 6, William Street, Caerphilly completed on 1st October 2025 at £154,000 and was recorded by HM Land Registry as a freehold house.

Since 1995 the property has sold 4 times.

Values of comparable properties have risen by 20.7% over the period since October 2025.

• Sold Oct 2025£154,000
• Sold Oct 2015£97,500
• Sold Nov 2011£92,000

Since 2022 194 properties similar to 6, William Street, Caerphilly have sold within a radius of 1.1 kilometres, per the Land Registry and our network of Estate Agents.

The latest, on the 8th April 2026, was 12, Coronation Street, Caerphilly, CF83 8DL, a freehold house which sold for £149,000.

Read more about house prices in CF83.

• Sold Apr 2026£149,000 | 3 Bed House12, Coronation Street, Caerphilly, CF83 8DL12, Coronation Street, Caerphilly, CF83 8DL
• Sold Mar 2026£188,000 | 3 Bed House42, Mary Street, Caerphilly, CF83 8HN42, Mary Street, Caerphilly, CF83 8HN
• 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 Jun 2025£155,000 | 3 Bed House11, Thomas Street, Caerphilly, CF83 8DP11, Thomas Street, Caerphilly, CF83 8DP
• Sold Apr 2025£141,000 | 3 Bed House47, Mary Street, Caerphilly, CF83 8HN47, Mary Street, Caerphilly, CF83 8HN
• Sold Jan 2025£185,000 | 3 Bed House25, Coronation Street, Caerphilly, CF83 8DL25, Coronation Street, Caerphilly, CF83 8DL
• Sold Dec 2024£168,650 | 3 Bed House30, Thomas Street, Caerphilly, CF83 8DP30, Thomas Street, Caerphilly, CF83 8DP
• Sold Dec 2024£137,500 | 3 Bed House1, Thomas Street, Caerphilly, CF83 8DP1, 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£160,000 | 3 Bed House21, Thomas Street, Caerphilly, CF83 8DP21, Thomas Street, Caerphilly, CF83 8DP
• 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£159,000 | 3 Bed House29, Thomas Street, Caerphilly, CF83 8DP29, Thomas Street, Caerphilly, CF83 8DP
• Sold Mar 2024£180,000 | 3 Bed House30, Mary Street, Caerphilly, CF83 8HN30, Mary Street, Caerphilly, CF83 8HN
• Sold Feb 2024£145,000 | 3 Bed House16, Mary Street, Caerphilly, CF83 8HN16, Mary Street, Caerphilly, CF83 8HN
• Sold Sep 2023£140,000 | 3 Bed House33, Mary Street, Caerphilly, CF83 8HN33, Mary Street, Caerphilly, CF83 8HN
• 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 Jun 2022£155,000 | 3 Bed House35, William Street, Caerphilly, CF83 8DQ35, William Street, Caerphilly, CF83 8DQ

Of the 71 addresses on William Street, Trethomas, Caerphilly, CF83, 6, William Street, Caerphilly comes out as the 53rd largest and the 46th most expensive in our analysis of the public data.

It is also £59k less expensive than the average property across the CF83 district.

• Caerphilly

  |

  3.5 km away
• Energlyn & Churchill Park

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  3.5 km away
• Llanbradach

  |

  3.8 km away

The flood risk here is rated Very Low, based on Environment Agency data.