12 Chatsworth Avenue, Cambridge, CB4 3LT

12 Chatsworth Avenue is a two-bedroom semi-detached house in Cambridge (CB4 3LT). It has a recorded floor area of 59 m² (around 635 sq ft), construction records dating it to 1950-1966 and council tax band B. At 59 m² this is the 21st smallest of 38 units on EPC record in the building, where floor areas span 45–82 m². The building's EPC ratings span D to B, with this unit at the bottom. The latest certificate (August 2014) shows a D (score 65), on the cusp of jumping into the C band. The recommended improvements would push it to C (score 78). The latest certificate is from August 2014, so improvements made since then won't be reflected.

Held since September 1998 — that's 28 years off the open market, well above the local norm. Only one transfer is on record with HM Land Registry, suggesting it has stayed in the same hands for a long time. Today's modelled estimate of £291,000 sits 321.7% above the 1998 sale of £69,000. On a £-per-square-foot basis, the last sale (£109/sq ft) was about 60.2% below the postcode norm. It lags the bulk of the postcode on energy efficiency (less efficient than 70% of similar EPCs).