8 Athelstan Walk North, Welwyn Garden City, AL7 3SH

8 Athelstan Walk North is a detached house in Welwyn Garden City (AL7 3SH). It has a recorded floor area of 44 m² (around 474 sq ft), construction records dating it to 1983-1990 and council tax band B. The latest certificate (November 2010) returns a B (score 81), comfortably above the UK average. When first surveyed in November 2008 the rating was D, the property has climbed 2 bands since. Between certificates, roof efficiency went from Average to Good, hot-water efficiency went from Very Poor to Good and lighting went from Very Poor to Very Good. The latest certificate is from November 2010, so improvements made since then won't be reflected. At 44 m² this is the 2nd smallest of 35 units on EPC record in the building, where floor areas span 40–58 m². The building's EPC ratings span D to B, with this unit at the top. On EPC score it ranks first in the building (81 versus a worst of 62).

Held since November 1999 — that's 26 years off the open market, well above the local norm. Only one transfer is on record with HM Land Registry, suggesting it has stayed in the same hands for a long time. At 44 m² it's 19.9% smaller than the typical home in the postcode (55 m² median across 34 EPCs). On energy efficiency it sits in the top 10% of properties in this postcode. Today's modelled estimate of £200,000 sits 263.6% above the 1999 sale of £55,000. On a £-per-square-foot basis, the last sale (£116/sq ft) was about 48% below the postcode norm.