138a, Amersham Road, High Wycombe, HP13 5AB

138a is a one-bedroom detached house in High Wycombe (HP13 5AB). It has a recorded floor area of 45 m² (around 484 sq ft), construction records dating it to 1900-1929 and council tax band B. At 45 m² this is the smallest unit on EPC record across the building (45–115 m²). The building's EPC ratings span G to D, with this unit at the bottom. On EPC score it ranks last in the building (16 versus a best of 66). The latest certificate (March 2021) shows a G (score 16), near the bottom of the EPC scale. The recommended improvements would lift it to C (score 72), a 4-band jump. Main heating runs on to be used only when there is no heating/hot.

At 45 m² it sits well below the postcode median (84 m² across 12 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. On a £-per-square-foot basis, the last sale (£405/sq ft) was about 82.4% above the typical sold price in the postcode. Sold September 2022 for £196,000. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.