129a, Park Street, Aylesbury, HP20 1DU

129a is a mid-terrace house in Aylesbury (HP20 1DU). It has a recorded floor area of 36 m² (around 388 sq ft), construction records dating it to 1900-1929 and council tax band A. At 36 m² this is the 3rd smallest of 27 units on EPC record in the building, where floor areas span 34–108 m². The building's EPC ratings span E to C, with this unit at the bottom. The latest certificate (July 2022) shows an E (score 53), well below the UK norm with real room to improve. The rating has held steady at E across 2 certificates since February 2010. Between certificates, hot-water efficiency went from Very Poor to Poor and lighting went from Good to Very Good; while roof efficiency dropped from Good to Poor and main heating dropped from Poor to Very Poor. The recommended improvements would lift it to C (score 80), a 2-band jump. Main heating runs on electricity.

At 36 m² it sits well below the postcode median (78 m² across 26 EPCs), making it one of the more compact homes locally. It lags the bulk of the postcode on energy efficiency (less efficient than 77% of similar EPCs). Last changed hands 12 years ago, in October 2014. Across the public record there are 6 sales, relatively high churn for a single property. Across 1995–2014, sale prices on this property compounded at 6.7% per year. Today's modelled estimate of £143,000 is 43.7% above the 2014 sale price.