21a, Calderon Road, Waltham Forest, London, E11 4ET

21a is an end-of-terrace house in Waltham Forest, London, London (E11 4ET). It has a recorded floor area of 75 m² (around 807 sq ft) and construction records dating it to before 1900. At 75 m² this is the 11th smallest of 42 units on EPC record in the building, where floor areas span 36–148 m². The building's EPC ratings span E to C, with this unit at the bottom. The latest certificate (March 2021) shows an E (score 54), well below the UK norm with real room to improve. The recommended improvements would push it to D (score 64).

It hasn't traded since August 2002, a hold of 24 years that's notably long for the area. Across 2002–2002, sale prices on this property compounded at 47.1% per year. Today's modelled estimate of £436,000 sits 190.7% above the 2002 sale of £149,995. On a £-per-square-foot basis, the last sale (£186/sq ft) was about 21.5% below the postcode norm. At 75 m² it's 16.7% smaller than the typical home in the postcode (90 m² median across 53 EPCs). It lags the bulk of the postcode on energy efficiency (less efficient than 89% of similar EPCs).