414a, Erith Road, Northumberland Heath, Erith, DA8 3NJ

414a is a two-bedroom semi-detached house in Northumberland Heath, Erith, Erith (DA8 3NJ). It has a recorded floor area of 54 m² (around 581 sq ft), construction records dating it to 1967-1975 and council tax band B. Tenure is freehold. The latest certificate (February 2014) shows an F (score 32), near the bottom of the EPC scale. The recommended improvements would lift it to D (score 61), a 2-band jump. Main heating runs on electricity. The latest certificate is from February 2014, so improvements made since then won't be reflected. At 54 m² this is the 3rd smallest of 17 units on EPC record in the building, where floor areas span 52–133 m². The building's EPC ratings span F to C, with this unit at the bottom. On EPC score it ranks last in the building (32 versus a best of 75).

At 54 m² it sits well below the postcode median (88 m² across 16 EPCs), making it one of the more compact homes locally. It lags the bulk of the postcode on energy efficiency (less efficient than 88% of similar EPCs). Today's modelled estimate of £251,000 is 37.9% above the 2014 sale price. On a £-per-square-foot basis, the last sale (£313/sq ft) was about 35% above the typical sold price in the postcode. On the market in December 2014 and unlisted since — roughly 11 years.