23a, Church Hill Road, East Barnet, Barnet, EN4 8SY

23a is a detached house in East Barnet, Barnet, Barnet (EN4 8SY). It has a recorded floor area of 62 m² (around 667 sq ft), construction records dating it to 1976-1982 and council tax band C. At 62 m² this is the 10th smallest of 16 units on EPC record in the building, where floor areas span 37–75 m². The building's EPC ratings span E to C, with this unit at the bottom. On EPC score it ranks last in the building (52 versus a best of 78). The latest certificate (September 2020) shows an E (score 52), well below the UK norm with real room to improve. The rating has held steady at E across 4 certificates since January 2009. Between certificates, wall efficiency went from Poor to Average and roof efficiency went from Very Poor to Poor; while hot-water efficiency dropped from Poor to Very Poor. The recommended improvements would lift it to C (score 72), a 2-band jump. Main heating runs on electricity.

Held since July 2006 — that's 20 years off the open market, well above the local norm. Across 2000–2006, sale prices on this property compounded at 9.7% per year. Today's modelled estimate of £288,000 sits 92% above the 2006 sale of £150,000. On a £-per-square-foot basis, the last sale (£225/sq ft) was about 92.3% above the typical sold price in the postcode. It lags the bulk of the postcode on energy efficiency (less efficient than 87% of similar EPCs).