21 Alliance Court, Hills Avenue, Cambridge, CB1 7XE

21 Alliance Court is a detached house in Cambridge (CB1 7XE). It has a recorded floor area of 71 m² (around 764 sq ft), construction records dating it to 1967-1975 and council tax band C. At 71 m² this is the 6th smallest of 19 units on EPC record in the building, where floor areas span 63–84 m². The building's EPC ratings span E to B, with this unit at the bottom. On EPC score it ranks last in the building (45 versus a best of 81). The latest certificate (September 2020) shows an E (score 45), well below the UK norm with real room to improve. The rating has held steady at E across 2 certificates since September 2010. Between certificates, lighting went from Average to Very Good; while window efficiency dropped from Good to Average and hot-water efficiency dropped from Poor to Very Poor. Main heating runs on electricity.

On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. Across 1998–2016, sale prices on this property compounded at 9.3% per year. On a £-per-square-foot basis, the last sale (£458/sq ft) was about 60.1% above the typical sold price in the postcode. Last sold in March 2016, so it's been off the market for around 10 years.