11a, Portobello Road, Kensington And Chelsea, London, W11 3DA

11a is a two-bedroom mid-terrace house in Kensington And Chelsea, London, London (W11 3DA). It has a recorded floor area of 75 m² (around 807 sq ft) and construction records dating it to before 1900. At 75 m² this is the 3rd smallest of 5 units on EPC record in the building, where floor areas span 50–172 m². The building's EPC ratings span G to C, with this unit at the top. On EPC score it ranks first in the building (69 versus a worst of 1). The latest certificate (December 2025) shows a C (score 69), just inside the C band. When first surveyed in November 2015 the rating was E, the property has climbed 2 bands since. Between certificates, wall efficiency went from Very Poor to Poor, roof efficiency went from Very Poor to Good and lighting went from Very Poor to Very Good. This certificate was lodged in the last six months, so the rating reflects current condition.

Held since March 2005 — that's 21 years off the open market, well above the local norm. Sale prices here have outpaced London HPI: 17.1% per year against 0% for the wider region. Today's modelled estimate of £1,464,000 sits 62.7% above the 2005 sale of £900,000. On a £-per-square-foot basis, the last sale (£1,115/sq ft) was about 205.2% above the typical sold price in the postcode. At 75 m² it's 28.4% smaller than the typical home in the postcode (105 m² median across 5 EPCs). On energy efficiency it sits in the top 10% of properties in this postcode.