1 Rosanne House, Bridge Road, Welwyn Garden City, AL8 6DE

1 Rosanne House is a one-bedroom detached house in Welwyn Garden City (AL8 6DE). It has a recorded floor area of 41 m² (around 441 sq ft), construction records dating it to 1930-1949 and council tax band C. At 41 m² this is the smallest unit on EPC record across 1 Rosanne House (41–88 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 (78 versus a best of 83). The latest certificate (December 2020) shows a C (score 78), near the top of the C band. The rating has held steady at C across 3 certificates since February 2009. Between certificates, lighting went from Average to Good.

At 41 m² it sits well below the postcode median (84 m² across 23 EPCs), making it one of the more compact homes locally. It lags the bulk of the postcode on energy efficiency (less efficient than 74% of similar EPCs). 1 bedrooms is on the smaller side for this postcode, where 3 is the typical count. Across 2009–2021, sale prices on this property compounded at 2.8% per year. On a £-per-square-foot basis, the last sale (£544/sq ft) was about 35.9% above the typical sold price in the postcode. Last sale on file: £240,000 in April 2021. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.