23 Aldbury Grove, Welwyn Garden City, AL7 2LB

23 Aldbury Grove is a one-bedroom mid-terrace house in Welwyn Garden City (AL7 2LB). It has a recorded floor area of 48 m² (around 517 sq ft), construction records dating it to 1967-1975 and council tax band B. The latest certificate (May 2021) shows a C (score 78), near the top of the C band. Earlier certificates rated it B (January 2011); the latest reading is one band lower. Between certificates, window efficiency went from Average to Good and lighting went from Very Poor to Very Good; while wall efficiency dropped from Good to Average. At 48 m² this is the 9th smallest of 32 units on EPC record in the building, where floor areas span 34–89 m². The building's EPC ratings span E to B across 32 units on file.

Held since October 2006 — that's 20 years off the open market, well above the local norm. Sale prices here have outpaced England HPI: 14% per year against 0% for the wider region. Today's modelled estimate of £181,000 is 42% above the 2006 sale price. On a £-per-square-foot basis, the last sale (£247/sq ft) was about 18.9% above the typical sold price in the postcode. At 48 m² it's 18.2% smaller than the typical home in the postcode (59 m² median across 31 EPCs). 1 bedrooms is on the smaller side for this postcode, where 3 is the typical count.