Flat 3, 21 Catherine Road, Surbiton, KT6 4HA

Flat 3 is a two-bedroom detached house in Surbiton (KT6 4HA). It has a recorded floor area of 79 m² (around 850 sq ft), construction records dating it to 1900-1929 and council tax band D. At 79 m² this is the largest unit on EPC record across the building (67–79 m²). The building's EPC ratings span E to D, with this unit at the top. Period features are noted in the property record. The latest certificate (July 2020) shows a D (score 67), on the cusp of jumping into the C band. The rating has held steady at D across 2 certificates since June 2009. Between certificates, lighting went from Very Poor to Very Good; while hot-water efficiency dropped from Very Good to Good and main heating dropped from Very Good to Good. The recommended improvements would push it to C (score 79).

Held since November 2002 — that's 24 years off the open market, well above the local norm. Across 1997–2002, sale prices on this property compounded at 17.3% per year. Today's modelled estimate of £518,000 sits 127.2% above the 2002 sale of £228,000. On a £-per-square-foot basis, the last sale (£268/sq ft) was about 22.6% below the postcode norm.