Basement Flat, 1 Tanyfron Terrace, High Street, Bangor, LL57 1AZ

Basement Flat is a semi-detached house in Bangor (LL57 1AZ). It has a recorded floor area of 27 m² (around 291 sq ft), construction records dating it to before 1900 and council tax band A. The latest certificate (January 2021) shows a D (score 68), on the cusp of jumping into the C band. Earlier certificates rated it C (February 2011); the latest reading is one band lower. Between certificates, hot-water efficiency dropped from Very Good to Good and main heating dropped from Very Good to Good. The recommended improvements would push it to C (score 78).

It hasn't traded since March 2009, a hold of 17 years that's notably long for the area. That sale fell during the post-crash dip, which often skews comparisons against later neighbouring sales. Today's modelled estimate of £110,000 sits 57.1% above the 2009 sale of £70,000. On a £-per-square-foot basis, the last sale (£241/sq ft) was about 129% above the typical sold price in the postcode. At 27 m² it sits well below the postcode median (120 m² across 4 EPCs), making it one of the more compact homes locally.