HM Land Registry records the plot of land for 14, Mostyn Avenue, Carmarthen as measuring 855 m².

That makes it the largest plot in the postcode, where 13 of the 15 other houses have recorded plot data.

14, Mostyn Avenue, Carmarthen has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 20 May 2021.

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 14, Mostyn Avenue, Carmarthen completed on 13th September 2021 at £290,000 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 11.4% over the period since September 2021.

• Sold Sep 2021£290,000

Since 2013 57 properties similar to 14, Mostyn Avenue, Carmarthen have sold within a radius of 1.6 kilometres, per the Land Registry and our network of Estate Agents.

The latest, on the 25th November 2025, was 10, Penybanc, Carmarthen, SA31 2HA, a freehold house which sold for £365,000.

Read more about house prices in SA31.

• Sold Nov 2025£365,000 | 4 Bed House10, Penybanc, Carmarthen, SA31 2HA10, Penybanc, Carmarthen, SA31 2HA
• Sold Mar 2025£228,000 | 4 Bed House5, Bronwydd Road, Carmarthen, SA31 2AJ5, Bronwydd Road, Carmarthen, SA31 2AJ
• Sold Oct 2024£285,000 | 4 Bed House52, Glynderi, Carmarthen, SA31 2EX52, Glynderi, Carmarthen, SA31 2EX
• Sold Apr 2024£233,850 | 4 Bed House56, Bronwydd Road, Carmarthen, SA31 2AN56, Bronwydd Road, Carmarthen, SA31 2AN
• Sold Dec 2023£280,000 | 4 Bed House83, Abergwili Road, Carmarthen, SA31 2HJ83, Abergwili Road, Carmarthen, SA31 2HJ
• Sold Nov 2023£358,000 | 4 Bed House54, Glynderi, Carmarthen, SA31 2EX54, Glynderi, Carmarthen, SA31 2EX
• Sold Aug 2023£380,000 | 4 Bed House5, Mostyn Avenue, Carmarthen, SA31 2AH5, Mostyn Avenue, Carmarthen, SA31 2AH
• Sold Mar 2023£230,000 | 4 Bed House73, Bronwydd Road, Carmarthen, SA31 2AP73, Bronwydd Road, Carmarthen, SA31 2AP
• Sold Apr 2022£342,500 | 4 Bed House16, Ael Y Bryn, Carmarthen, SA31 2HB16, Ael Y Bryn, Carmarthen, SA31 2HB
• Sold Jan 2022£297,500 | 4 Bed House41, Bronwydd Road, Carmarthen, SA31 2AL41, Bronwydd Road, Carmarthen, SA31 2AL
• Sold Aug 2021£290,000 | 4 Bed House1, Pantglas, Carmarthen, SA31 2AY1, Pantglas, Carmarthen, SA31 2AY
• Sold Feb 2021£295,000 | 4 Bed House6, Pantglas, Carmarthen, SA31 2AY6, Pantglas, Carmarthen, SA31 2AY
• Sold Nov 2019£296,000 | 4 Bed House13, Pantglas, Carmarthen, SA31 2AY13, Pantglas, Carmarthen, SA31 2AY
• Sold May 2019£259,950 | 4 Bed House79, Hafod Cwnin, Carmarthen, SA31 2AS79, Hafod Cwnin, Carmarthen, SA31 2AS
• Sold Mar 2018£267,000 | 5 Bed House44, Bronwydd Road, Carmarthen, SA31 2AN44, Bronwydd Road, Carmarthen, SA31 2AN
• Sold Nov 2017£235,000 | 4 Bed House8, Dolgwili Road, Carmarthen, SA31 2AE8, Dolgwili Road, Carmarthen, SA31 2AE
• Sold Apr 2017£280,000 | 4 Bed House45, Bronwydd Road, Carmarthen, SA31 2AL45, Bronwydd Road, Carmarthen, SA31 2AL
• Sold Apr 2016£145,000 | 4 Bed House32, Hafod Cwnin, Carmarthen, SA31 2AT32, Hafod Cwnin, Carmarthen, SA31 2AT
• Sold Oct 2014£200,000 | 4 Bed House9, Pantglas, Carmarthen, SA31 2AY9, Pantglas, Carmarthen, SA31 2AY
• Sold Sep 2013£182,000 | 4 Bed House2, Dolgwili Road, Carmarthen, SA31 2AE2, Dolgwili Road, Carmarthen, SA31 2AE

Of the 15 addresses on Mostyn Avenue, Carmarthen, SA31, 14, Mostyn Avenue, Carmarthen comes out as the largest and the 11th most expensive in our analysis of the public data.

It is also £87k more expensive than the average property across the SA31 district.

• Carmarthen

  |

  2.3 km away
• Ferryside

  |

  12.6 km away
• Kidwelly

  |

  15.2 km away

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