HM Land Registry records the plot of land for 17, William Street, Caernarfon as measuring 63 m².

That makes it the 27th largest plot in the postcode, where 38 of the 39 other houses have recorded plot data.

17, William Street, Caernarfon has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 07 Nov 2012.

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

The most recent sale of 17, William Street, Caernarfon completed on 15th January 2013 at £88,000 and was recorded by HM Land Registry as a freehold house.

Since 1995 this is the property's only sale.

Values of comparable properties have risen by 80.1% over the period since January 2013.

• Sold Jan 2013£88,000

Since 2011 67 properties similar to 17, William Street, Caernarfon have sold within a radius of 510 metres, per the Land Registry and our network of Estate Agents.

The latest, on the 20th February 2026, was 47, Assheton Terrace, Caernarfon, LL55 2LD, a freehold house which sold for £146,250.

Read more about house prices in LL55.

• Sold Feb 2026£146,250 | 3 Bed House47, Assheton Terrace, Caernarfon, LL55 2LD47, Assheton Terrace, Caernarfon, LL55 2LD
• Sold Sep 2025£120,000 | 3 Bed House4, Cadnant Road, Caernarfon, LL55 1NA4, Cadnant Road, Caernarfon, LL55 1NA
• Sold Aug 2025£92,500 | 3 Bed House18, New Street, Caernarfon, LL55 2PU18, New Street, Caernarfon, LL55 2PU
• Sold Jun 2025£106,000 | 3 Bed House7, Tithebarn Street, Caernarfon, LL55 2RF7, Tithebarn Street, Caernarfon, LL55 2RF
• Sold Mar 2025£95,000 | 3 Bed House3, Cadnant Road, Caernarfon, LL55 1NA3, Cadnant Road, Caernarfon, LL55 1NA
• Sold Jan 2025£90,000 | 3 Bed House34, William Street, Caernarfon, LL55 1ND34, William Street, Caernarfon, LL55 1ND
• 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 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 Aug 2023£131,750 | 3 Bed House40, Chapel Street, Caernarfon, LL55 2PS40, Chapel Street, Caernarfon, LL55 2PS
• Sold Oct 2022£110,000 | 3 Bed House39, William Street, Caernarfon, LL55 1ND39, William Street, Caernarfon, LL55 1ND
• 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 Jul 2019£95,000 | 3 Bed House32, William Street, Caernarfon, LL55 1ND32, William Street, Caernarfon, LL55 1ND
• Sold Nov 2017£50,000 | 3 Bed House7, New Street, Caernarfon, LL55 2PU7, New Street, Caernarfon, LL55 2PU
• Sold Mar 2015£98,500 | 3 Bed House15, William Street, Caernarfon, LL55 1ND15, William Street, Caernarfon, LL55 1ND
• Sold Sep 2011£100,000 | 3 Bed House25, William Street, Caernarfon, LL55 1ND25, William Street, Caernarfon, LL55 1ND

Of the 39 addresses on William Street, Caernarfon, LL55, 17, William Street, Caernarfon comes out as the 13th largest and the 14th most expensive in our analysis of the public data.

It is also £105k less expensive than the average property across the LL55 district.

• Llanfairpwll

  |

  9.8 km away
• Bodorgan

  |

  12.2 km away
• Bangor (Gwynedd)

  |

  12.7 km away

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