10, William Street, Caernarfon occupies a 79 m² plot as recorded by HM Land Registry.

Of the 39 other houses in this postcode, 38 have recorded plot sizes, and this one ranks as the 6th largest.

10, William Street, Caernarfon has an Energy Performance Rating (EPC) of E. This is based on the most recent assessment, dated 18 May 2009.

The property is connected to mains gas and has fully double glazed windows. It is heated using electric storage heaters.

10, William Street, Caernarfon last changed hands on 11th December 2009, selling for £86,500. The transaction was logged as a freehold house by HM Land Registry.

In total it has sold twice since 1995.

The market for similar properties has risen by 79.1% since December 2009.

• Sold Dec 2009£86,500
• Sold Feb 1998£33,500

Land Registry records and our Estate Agent network show 79 sales of comparable properties within 510 metres of 10, William Street, Caernarfon since 2014.

Most recently, 3, New Street, Caernarfon, LL55 2PU, a freehold house, sold at £120,000 on the 22nd December 2025.

Read more about house prices in LL55.

• Sold Dec 2025£120,000 | 3 Bed House3, New Street, Caernarfon, LL55 2PU3, New Street, Caernarfon, LL55 2PU
• Sold Dec 2025£147,500 | 3 Bed House34, Margaret Street, Caernarfon, LL55 1NB34, Margaret Street, Caernarfon, LL55 1NB
• Sold Nov 2025£110,000 | 3 Bed House54, Chapel Street, Caernarfon, LL55 2PS54, Chapel Street, Caernarfon, LL55 2PS
• Sold Mar 2025£95,000 | 3 Bed House3, Cadnant Road, Caernarfon, LL55 1NA3, Cadnant Road, Caernarfon, LL55 1NA
• Sold Nov 2024£150,000 | 3 Bed House12, Holywell Terrace, Caernarfon, LL55 2AP12, Holywell Terrace, Caernarfon, LL55 2AP
• Sold Oct 2024£90,000 | 3 Bed House28, William Street, Caernarfon, LL55 1ND28, William Street, Caernarfon, LL55 1ND
• Sold Oct 2024£88,000 | 3 Bed House50, Chapel Street, Caernarfon, LL55 2PS50, Chapel Street, Caernarfon, LL55 2PS
• Sold Jul 2024£111,000 | 3 Bed House37, William Street, Caernarfon, LL55 1ND37, William Street, Caernarfon, LL55 1ND
• Sold Jun 2024£90,000 | 3 Bed House9, Assheton Terrace, Caernarfon, LL55 2LD9, Assheton Terrace, Caernarfon, LL55 2LD
• Sold Jun 2024£132,500 | 3 Bed House15, Margaret Street, Caernarfon, LL55 1NB15, Margaret Street, Caernarfon, LL55 1NB
• Sold Dec 2023£60,000 | 3 Bed House58, Chapel Street, Caernarfon, LL55 2PS58, Chapel Street, Caernarfon, LL55 2PS
• Sold Aug 2023£131,750 | 3 Bed House40, Chapel Street, Caernarfon, LL55 2PS40, Chapel Street, Caernarfon, LL55 2PS
• Sold Nov 2022£160,000 | 3 Bed House3, Tithebarn Street, Caernarfon, LL55 2RF3, Tithebarn Street, Caernarfon, LL55 2RF
• Sold Oct 2022£110,000 | 3 Bed House39, William Street, Caernarfon, LL55 1ND39, William Street, Caernarfon, LL55 1ND
• Sold Aug 2022£105,000 | 3 Bed House52, Chapel Street, Caernarfon, LL55 2PS52, Chapel Street, Caernarfon, LL55 2PS
• Sold Jun 2022£135,000 | 3 Bed House23, New Street, Caernarfon, LL55 2PU23, New Street, Caernarfon, LL55 2PU
• Sold May 2022£107,500 | 3 Bed House20, William Street, Caernarfon, LL55 1ND20, William Street, Caernarfon, LL55 1ND
• Sold Mar 2021£100,000 | 3 Bed House56, Chapel Street, Caernarfon, LL55 2PS56, Chapel Street, Caernarfon, LL55 2PS
• Sold Jun 2020£95,000 | 3 Bed House14, William Street, Caernarfon, LL55 1ND14, William Street, Caernarfon, LL55 1ND
• Sold Nov 2014£90,000 | 3 Bed House18, William Street, Caernarfon, LL55 1ND18, William Street, Caernarfon, LL55 1ND

Our analysis of the public data ranks 10, William Street, Caernarfon as the 6th largest and the 8th most expensive of the 39 addresses on William Street, Caernarfon, LL55.

Against the LL55 postcode district average, it is £100k less expensive than the typical property.

• Llanfairpwll

  |

  9.8 km away
• Bodorgan

  |

  12.2 km away
• Bangor (Gwynedd)

  |

  12.7 km away

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