21 William Street, Bangor, LL57 1BG

21 William Street is a four-bedroom mid-terrace house in Bangor (LL57 1BG). It has a recorded floor area of 88 m² (around 947 sq ft), construction records dating it to before 1900 and council tax band B. The latest certificate (April 2018) shows a D (score 63), on the cusp of jumping into the C band. The rating has held steady at D across 2 certificates since February 2011. Between certificates, lighting went from Good to Very Good; while wall efficiency dropped from Good to Very Poor and roof efficiency dropped from Average to Very Poor. The recommended improvements would push it to C (score 80).

Sale prices here have outpaced England HPI: 4.9% per year against 0% for the wider region. Today's modelled estimate of £165,000 is 23.1% above the 2021 sale price. Sold November 2021 for £134,000. Across the public record there are 4 sales, relatively high churn for a single property. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend. At 88 m² it's 18.9% larger than the typical home in the postcode (74 m² median across 19 EPCs).