9a, Grimston Road, Colchester, CO2 7RN

9a is a detached house in Colchester (CO2 7RN). It has a recorded floor area of 49 m² (around 527 sq ft), construction records dating it to 1976-1982 and council tax band A. At 49 m² this is the 5th smallest of 12 units on EPC record in the building, where floor areas span 42–112 m². The building's EPC ratings span E to C, with this unit at the bottom. On EPC score it ranks last in the building (45 versus a best of 74). The latest certificate (July 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 October 2009. Between certificates, wall efficiency went from Poor to Good, lighting went from Very Poor to Very Good and main heating went from Poor to Average; while roof efficiency dropped from Average to Poor. The recommended improvements would lift it to C (score 74), a 2-band jump. Main heating runs on electricity.

Held since December 2006 — that's 19 years off the open market, well above the local norm. On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. Across 2006–2006, sale prices on this property compounded at 26% per year. Today's modelled estimate of £155,000 is 27.5% above the 2006 sale price. On a £-per-square-foot basis, the last sale (£231/sq ft) was about 32.3% above the typical sold price in the postcode.