423a, Alexandra Avenue, Harrow, HA2 9SE

423a is a mid-terrace house in Harrow (HA2 9SE). It has a recorded floor area of 35 m² (around 377 sq ft) and construction records dating it to 1930-1949. At 35 m² this is the 11th smallest of 29 units on EPC record in the building, where floor areas span 25–123 m². The building's EPC ratings span E to C, with this unit at the top. The latest certificate (January 2019) shows a C (score 74). The rating has held steady at C across 2 certificates since January 2009. Between certificates, lighting went from Very Poor to Very Good; while window efficiency dropped from Good to Average.

It hasn't traded since April 2007, a hold of 19 years that's notably long for the area. That sale landed at the peak of the pre-credit-crunch market, which is a useful reference point when interpreting the price. At 35 m² it sits well below the postcode median (52 m² across 28 EPCs), making it one of the more compact homes locally. Its energy rating outperforms most of the postcode (better than 86% of similar EPCs). 3 planning records sit against the property, 2 approved, 0 refused. Past consents include a loft conversion, meaningful when judging how the property has evolved. Across 2005–2007, sale prices on this property compounded at -7.6% per year. Today's modelled estimate of £224,000 is 40% above the 2007 sale price. On a £-per-square-foot basis, the last sale (£425/sq ft) was about 32.6% below the postcode norm.