According to data from HM Land Registry, 31, Trefonwys, Bangor sits on a plot of 584 m².

We have plot size data on 31 out of 33 other houses in the postcode and 31, Trefonwys, Bangor sits on the 27th largest plot.

31, Trefonwys, Bangor has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 03 Apr 2014.

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

According to the Land Registry and our network of Estate Agents, there have been 51 sales of properties similar to 31, Trefonwys, Bangor within a radius of 670 metres since 2007.

The most recent example is 16, Lon Y Meillion, Bangor, LL57 2LE, a freehold house which sold for £325,000 on the 11th December 2025.

Read more about house prices in LL57.

• Sold Dec 2025£325,000 | 4 Bed House16, Lon Y Meillion, Bangor, LL57 2LE16, Lon Y Meillion, Bangor, LL57 2LE
• Sold Apr 2025£312,000 | 4 Bed House45, Maes Berea, Bangor, LL57 4TQ45, Maes Berea, Bangor, LL57 4TQ
• Sold Mar 2025£410,000 | 4 Bed House36, Maes Berea, Bangor, LL57 4TQ36, Maes Berea, Bangor, LL57 4TQ
• Sold Jan 2025£299,500 | 4 Bed House22, Belmont Drive, Bangor, LL57 2HS22, Belmont Drive, Bangor, LL57 2HS
• Sold Jul 2024£339,950 | 4 Bed House30, Maes Berea, Bangor, LL57 4TQ30, Maes Berea, Bangor, LL57 4TQ
• Sold Oct 2023£330,000 | 4 Bed House32, Belmont Road, Bangor, LL57 2LL32, Belmont Road, Bangor, LL57 2LL
• Sold May 2023£330,000 | 4 Bed House9, Trefonwys, Bangor, LL57 2HU9, Trefonwys, Bangor, LL57 2HU
• Sold Nov 2022£275,000 | 4 Bed House5, Lon Y Meillion, Bangor, LL57 2LE5, Lon Y Meillion, Bangor, LL57 2LE
• Sold Sep 2022£385,000 | 4 Bed House11, Lon Y Bryn, Bangor, LL57 2LH11, Lon Y Bryn, Bangor, LL57 2LH
• Sold Oct 2021£303,000 | 4 Bed House19, Ffriddoedd Road, Bangor, LL57 2TW19, Ffriddoedd Road, Bangor, LL57 2TW
• Sold Mar 2021£225,000 | 4 Bed House11A, Lon Y Deri, Bangor, LL57 2LF11A, Lon Y Deri, Bangor, LL57 2LF
• Sold Dec 2020£215,000 | 4 Bed House3, Lon Y Meillion, Bangor, LL57 2LE3, Lon Y Meillion, Bangor, LL57 2LE
• Sold Oct 2018£260,000 | 4 Bed House32, Trefonwys, Bangor, LL57 2HU32, Trefonwys, Bangor, LL57 2HU
• Sold Feb 2017£196,000 | 4 Bed House25, Bryn Eithinog, Bangor, LL57 2LA25, Bryn Eithinog, Bangor, LL57 2LA
• Sold Feb 2017£205,000 | 4 Bed House8, Belmont Drive, Bangor, LL57 2HS8, Belmont Drive, Bangor, LL57 2HS
• Sold Oct 2016£210,000 | 4 Bed House6, Lon Y Ffrwd, Bangor, LL57 2LG6, Lon Y Ffrwd, Bangor, LL57 2LG
• Sold Aug 2014£210,000 | 4 Bed House13, Lon Y Meillion, Bangor, LL57 2LE13, Lon Y Meillion, Bangor, LL57 2LE
• Sold Jan 2013£230,000 | 4 Bed House2, Trefonwys, Bangor, LL57 2HU2, Trefonwys, Bangor, LL57 2HU
• Sold Jul 2010£295,000 | 4 Bed House29, Trefonwys, Bangor, LL57 2HU29, Trefonwys, Bangor, LL57 2HU
• Sold Jan 2007£249,950 | 4 Bed House4, Lon Y Meillion, Bangor, LL57 2LE4, Lon Y Meillion, Bangor, LL57 2LE

Trefonwys, Bangor, LL57 has a total of 33 addresses. According to our analysis of all the public data, 31, Trefonwys, Bangor is the 24th largest and the 22nd most expensive property on the street.

When compared to the postcode district it is £122k more expensive than the average property in LL57.

• Bangor (Gwynedd)

  |

  900 m away
• Llanfairpwll

  |

  4.0 km away
• Llanfairfechan

  |

  11.7 km away

According to data from the Environment Agency, the flood risk in this area is considered to be Very Low.