4 Monarch Flats, Marshalsea Road, Southwark, London, SE1 1HQ

4 Monarch Flats is a mid-terrace house in Southwark, London, London (SE1 1HQ). It has a recorded floor area of 37 m² (around 398 sq ft), construction records dating it to 1900-1929 and council tax band B. At 37 m² this is the smallest unit on EPC record across the building (37–81 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 (48 versus a best of 74). The latest certificate (November 2024) shows an E (score 48), well below the UK norm with real room to improve. Earlier certificates rated it D (December 2023); the latest reading is one band lower. Between certificates, lighting went from Good to Very Good; while hot-water efficiency dropped from Good to Poor and main heating dropped from Good to Very Poor. The recommended improvements would lift it to C (score 80), a 2-band jump. Main heating runs on electricity.

At 37 m² it sits well below the postcode median (54 m² across 5 EPCs), making it one of the more compact homes locally. On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement.