12 Gilbert House, Green Street, High Wycombe, HP11 2RL

12 Gilbert House is a one-bedroom end-of-terrace house in High Wycombe (HP11 2RL). It has a recorded floor area of 46 m² (around 495 sq ft), construction records dating it to 1900-1929 and council tax band B. At 46 m² this is the 2nd smallest of 19 units on EPC record in the building, where floor areas span 42–75 m². The building's EPC ratings span D to B, with this unit at the bottom. On EPC score it ranks last in the building (67 versus a best of 81). The latest certificate (May 2019) shows a D (score 67), on the cusp of jumping into the C band. The recommended improvements would lift it to B (score 81), a 2-band jump.

Held since March 2002 — that's 24 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 1998–2002, sale prices on this property compounded at 14.5% per year. Today's modelled estimate of £181,000 sits 143% above the 2002 sale of £74,500. On a £-per-square-foot basis, the last sale (£150/sq ft) was about 24.8% below the postcode norm.