1 Tyn Llan Isaf, Caernarfon occupies a 1,122 m² plot as recorded by HM Land Registry.

Of the 9 other houses in this postcode, 6 have recorded plot sizes, and this one ranks as the 6th largest.

1 Tyn Llan Isaf, Caernarfon has an Energy Performance Rating (EPC) of F. This is based on the most recent assessment, dated 21 Jan 2022.

The property is connected to mains gas and has partial double glazing. It is heated using room heaters (electric).

Land Registry records and our Estate Agent network show 19 sales of comparable properties within 2.8 kilometres of 1 Tyn Llan Isaf, Caernarfon since 2008.

Most recently, 3 Menai Court, Caernarfon Road, Y Felinheli, LL56 4RZ, a freehold house, sold at £320,000 on the 5th December 2025.

Read more about house prices in LL55.

• Sold Dec 2025£320,000 | 4 Bed House3 Menai Court, Caernarfon Road, Y Felinheli, LL56 4RZ3 Menai Court, Caernarfon Road, Y Felinheli, LL56 4RZ
• Sold Nov 2025£330,000 | 4 Bed HouseDeulyn, Caernarfon, LL55 1UWDeulyn, Caernarfon, LL55 1UW
• Sold Oct 2025£270,000 | 4 Bed House1, Bro Eglwys, Caernarfon, LL55 1GA1, Bro Eglwys, Caernarfon, LL55 1GA
• Sold Sep 2025£377,000 | 4 Bed HouseTy Ffynnon, Caernarfon, LL55 1YUTy Ffynnon, Caernarfon, LL55 1YU
• Sold Dec 2023£360,000 | 4 Bed House3, Trem Y Foel, Y Felinheli, LL56 4UZ3, Trem Y Foel, Y Felinheli, LL56 4UZ
• Sold Nov 2022£350,000 | 3 Bed House2 Menai Court, Caernarfon Road, Y Felinheli, LL56 4RZ2 Menai Court, Caernarfon Road, Y Felinheli, LL56 4RZ
• Sold Jul 2022£472,500 | 4 Bed HouseNant Efa, Caernarfon, LL55 3ARNant Efa, Caernarfon, LL55 3AR
• Sold Apr 2022£440,000 | 4 Bed HouseRhos Fawr, Y Felinheli, LL56 4QERhos Fawr, Y Felinheli, LL56 4QE
• Sold Jan 2022£350,000 | 4 Bed HouseCadnant, Caernarfon, LL55 1YFCadnant, Caernarfon, LL55 1YF
• Sold Sep 2017£300,000 | 3 Bed HouseBakhita, Caernarfon, LL55 1YBBakhita, Caernarfon, LL55 1YB
• Sold Feb 2017£280,000 | 3 Bed House23, Trem Y Foel, Y Felinheli, LL56 4UZ23, Trem Y Foel, Y Felinheli, LL56 4UZ
• Sold Nov 2015£250,000 | 3 Bed HouseRhosannedd, Caernarfon, LL55 4ALRhosannedd, Caernarfon, LL55 4AL
• Sold Apr 2015£265,000 | 3 Bed HousePen Y Bryn, Caernarfon, LL55 3APPen Y Bryn, Caernarfon, LL55 3AP
• Sold May 2013£247,500 | 3 Bed HouseY Dderwen, Lon Cae Metta, Caernarfon, LL55 3AYY Dderwen, Lon Cae Metta, Caernarfon, LL55 3AY
• Sold Aug 2012£186,000 | 3 Bed House1 Cefn Cynrig, Caernarfon, LL55 1UW1 Cefn Cynrig, Caernarfon, LL55 1UW
• Sold Jun 2012£292,500 | 4 Bed HouseHylands, Penybryn Road, Y Felinheli, LL56 4YQHylands, Penybryn Road, Y Felinheli, LL56 4YQ
• Sold Aug 2009£280,000 | 4 Bed HousePolice House, Y Felinheli, LL56 4JQPolice House, Y Felinheli, LL56 4JQ
• Sold Nov 2008£286,000 | 4 Bed HouseSouth Winds, Penybryn Road, Y Felinheli, LL56 4YQSouth Winds, Penybryn Road, Y Felinheli, LL56 4YQ
• Sold Jul 2008£216,000 | 3 Bed House6 Menai Court, Caernarfon Road, Y Felinheli, LL56 4RZ6 Menai Court, Caernarfon Road, Y Felinheli, LL56 4RZ

Our analysis of the public data ranks 1 Tyn Llan Isaf, Caernarfon as the 42nd largest and the 17th most expensive of the 81 addresses on Llanddeiniolen, Caernarfon, LL55.

Against the LL55 postcode district average, it is £174k more expensive than the typical property.

• Llanfairpwll

  |

  6.5 km away
• Bangor (Gwynedd)

  |

  6.9 km away
• Llanfairfechan

  |

  16.5 km away

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