85a, Penryn Avenue, Fishermead, Milton Keynes, MK6 2BG

85a is a one-bedroom mid-terrace house in Fishermead, Milton Keynes, Milton Keynes (MK6 2BG). It has a recorded floor area of 52 m² (around 560 sq ft), construction records dating it to 1967-1975 and council tax band A. At 52 m² this is the 9th smallest of 55 units on EPC record in the building, where floor areas span 38–128 m². The building's EPC ratings span D to C, with this unit at the bottom. The latest certificate (December 2013) shows a D (score 68), on the cusp of jumping into the C band. Earlier certificates rated it C (August 2009); the latest reading is one band lower. Between certificates, window efficiency went from Very Poor to Average; while lighting dropped from Good to Very Poor. The recommended improvements would push it to C (score 75). The latest certificate is from December 2013, so improvements made since then won't be reflected.

Across 1999–2014, sale prices on this property compounded at 9% per year. Today's modelled estimate of £139,000 sits 73.8% above the 2014 sale of £80,000. On a £-per-square-foot basis, the last sale (£143/sq ft) was about 37.5% above the typical sold price in the postcode. At 52 m² it sits well below the postcode median (106 m² across 54 EPCs), making it one of the more compact homes locally. It lags the bulk of the postcode on energy efficiency (less efficient than 72% of similar EPCs). On the market in March 2014 and unlisted since — roughly 12 years.