18 20, Flat 4, High Street, Carshalton, SM5 3AG

18 20 is a mid-terrace house in Carshalton (SM5 3AG). It has a recorded floor area of 73 m² (around 786 sq ft) and construction records dating it to 1900-1929. At 73 m² this is the largest unit on EPC record across 18 20 (38–73 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 (43 versus a best of 78). The latest certificate (September 2013) shows an E (score 43), well below the UK norm with real room to improve. The recommended improvements would push it to D (score 59). The latest certificate is from September 2013, so improvements made since then won't be reflected.

At 73 m² the property is well over the postcode median (45 m² across 42 EPCs), placing it in the larger end of the local stock. It lags the bulk of the postcode on energy efficiency (less efficient than 79% of similar EPCs). 15 planning records sit against the property, 13 approved, 2 refused. Past consents include new windows, change of use to residential and subdivision, meaningful when judging how the property has evolved. The record references listed-building consent, which constrain future alterations.