Flat 2, 17 Hainton Avenue, Grimsby, DN32 9AS

Flat 2 is a three-bedroom mid-terrace house in Grimsby (DN32 9AS). It has a recorded floor area of 40 m² (around 431 sq ft), construction records dating it to 1900-1929 and council tax band A. The latest certificate (May 2020) shows an E (score 40), well below the UK norm with real room to improve. The rating has held steady at E across 2 certificates since July 2018. Between certificates, wall efficiency went from Poor to Good and roof efficiency went from Very Poor to Average; while hot-water efficiency dropped from Good to Very Poor and main heating dropped from Good to Very Poor. The recommended improvements would lift it to C (score 70), a 2-band jump. Main heating runs on to be used only when there is no heating/hot.

Held since June 2007 — that's 19 years off the open market, well above the local norm. That sale landed at the peak of the pre-credit-crunch market, which is a useful reference point when interpreting the price. Today's modelled estimate of £112,000 sits 72.3% above the 2007 sale of £65,000. On a £-per-square-foot basis, the last sale (£151/sq ft) was about 50.8% above the typical sold price in the postcode.