Marlborough House, Flat 7, Grove Road, Norwich, NR1 3RQ

Marlborough House is a two-bedroom detached house in Norwich (NR1 3RQ). It has a recorded floor area of 80 m² (around 861 sq ft), construction records dating it to 1976-1982 and council tax band B. At 80 m² this is the largest unit on EPC record across Marlborough House (55–80 m²). The building's EPC ratings span E to D, with this unit at the bottom. The latest certificate (July 2015) shows an E (score 46), well below the UK norm with real room to improve. The rating has held steady at E across 3 certificates since October 2008. Between certificates, hot-water efficiency went from Very Poor to Poor and lighting went from Very Poor to Very Good; while window efficiency dropped from Good to Average and main heating dropped from Poor to Very Poor. The recommended improvements would lift it to C (score 76), a 2-band jump. Main heating runs on electricity. The latest certificate is from July 2015, so improvements made since then won't be reflected.

It lags the bulk of the postcode on energy efficiency (less efficient than 80% of similar EPCs). On the market in August 2016 and unlisted since — roughly 10 years. Across 1998–2016, sale prices on this property compounded at 6.9% per year. Today's modelled estimate of £191,000 is 17.9% above the 2016 sale price.