12 Blenheim House, Crown Square, Southwark, London, SE1 2SF

12 Blenheim House is a detached house in Southwark, London, London (SE1 2SF). It has a recorded floor area of 416 m² (around 4478 sq ft). At 416 m² this is the 30th smallest of 31 units on EPC record in the building, where floor areas span 39–416 m². The building's EPC ratings span C to B, with this unit at the bottom. On EPC score it ranks last in the building (72 versus a best of 86). The latest certificate (January 2017) shows a C (score 72).

Across 2017–2022, sale prices on this property compounded at -12.6% per year. Today's modelled estimate of £5,147,000 is 26.2% below the 2022 sale of £6,975,000, an unusual pattern given regional price growth and worth checking against the EPC condition. On a £-per-square-foot basis, the last sale (£1,558/sq ft) was about 42.3% below the postcode norm. At 416 m² the property is well over the postcode median (115 m² across 30 EPCs), placing it in the larger end of the local stock. It lags the bulk of the postcode on energy efficiency (less efficient than 83% of similar EPCs). Sold August 2022 for £6,975,000. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.