100a, Warwick Way, Westminster, London, SW1V 1SD

100a is a two-bedroom mid-terrace house in Westminster, London, London (SW1V 1SD). It has a recorded floor area of 61 m² (around 657 sq ft) and construction records dating it to before 1900. At 61 m² this is the 2nd smallest of 7 units on EPC record in the building, where floor areas span 60–239 m². The building's EPC ratings span D to C, with this unit at the top. On EPC score it ranks first in the building (72 versus a worst of 55). The latest certificate (April 2021) shows a C (score 72). When first surveyed in August 2010 the rating was E, the property has climbed 2 bands since. Between certificates, wall efficiency went from Very Poor to Poor, hot-water efficiency went from Very Poor to Good and lighting went from Very Poor to Very Good.

One planning record on file: an extension approved in 2020. Past consents include an extension, meaningful when judging how the property has evolved. Its energy rating outperforms most of the postcode (better than 70% of similar EPCs). Across 1999–2016, sale prices on this property compounded at 6.2% per year. Today's modelled estimate of £563,000 is 28% above the 2016 sale price. On a £-per-square-foot basis, the last sale (£670/sq ft) was about 44.8% above the typical sold price in the postcode. 10 years since the last transfer (March 2016).