2a, Barnsbury Avenue, Aylesbury, HP20 1NL

2a is a two-bedroom semi-detached house in Aylesbury (HP20 1NL). It has a recorded floor area of 61 m² (around 657 sq ft), construction records dating it to 1950-1966 and council tax band B. The latest certificate (December 2015) shows a D (score 68), on the cusp of jumping into the C band. Earlier certificates rated it C (May 2009); the latest reading is one band lower. Between certificates, window efficiency went from Average to Good and lighting went from Poor to Average; while wall efficiency dropped from Average to Poor and hot-water efficiency dropped from Very Good to Good. The recommended improvements would push it to C (score 77). The latest certificate is from December 2015, so improvements made since then won't be reflected. At 61 m² this is the 8th smallest of 29 units on EPC record in the building, where floor areas span 38–120 m². The building's EPC ratings span F to C across 29 units on file.

Untraded for 17 years, with the last transfer in March 2009. That sale fell during the post-crash dip, which often skews comparisons against later neighbouring sales. Today's modelled estimate of £189,000 sits 122.4% above the 2009 sale of £85,000. On a £-per-square-foot basis, the last sale (£129/sq ft) was about 38.1% below the postcode norm.