129b, Park Street, Aylesbury, HP20 1DU

129b is a one-bedroom mid-terrace house in Aylesbury (HP20 1DU). It has a recorded floor area of 34 m² (around 366 sq ft), construction records dating it to before 1900 and council tax band A. At 34 m² this is the smallest unit on EPC record across the building (34–108 m²). The building's EPC ratings span E to C, with this unit at the top. On EPC score it ranks first in the building (79 versus a worst of 45). The latest certificate (November 2019) shows a C (score 79), near the top of the C band. When first surveyed in January 2009 the rating was D, the property has climbed 1 band since. Between certificates, hot-water efficiency went from Average to Good, lighting went from Poor to Very Good and main heating went from Poor to Good.

At 34 m² it sits well below the postcode median (78 m² across 26 EPCs), making it one of the more compact homes locally. Its energy rating outperforms most of the postcode (better than 81% of similar EPCs). Last sold in January 2015, so it's been off the market for around 11 years. Across the public record there are 5 sales, relatively high churn for a single property. Across 2003–2015, sale prices on this property compounded at 3.4% per year. Today's modelled estimate of £151,000 is 25.8% above the 2015 sale price. On a £-per-square-foot basis, the last sale (£328/sq ft) was about 48.3% above the typical sold price in the postcode.