Flat 1, 20 Elizabeth Mews, London, NW3 4UH

Flat 1 is a one-bedroom mid-terrace house in London (NW3 4UH). It has a recorded floor area of 53 m² (around 570 sq ft) and construction records dating it to 1976-1982. At 53 m² this is the 2nd smallest of 3 units on EPC record in the building, where floor areas span 51–63 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 (78 versus a worst of 53). Other recorded features include a balcony. Period features are noted in the property record. The latest certificate (May 2023) shows a C (score 78), near the top of the C band. When first surveyed in March 2013 the rating was D, the property has climbed 1 band since. Between certificates, wall efficiency went from Very Poor to Average, window efficiency went from Poor to Good and lighting went from Average to Very Good. The recommended improvements would push it to B (score 81).

At 53 m² it's 26.4% smaller than the typical home in the postcode (72 m² median across 18 EPCs). Its energy rating outperforms most of the postcode (better than 78% of similar EPCs). On a £-per-square-foot basis, the last sale (£1,157/sq ft) was about 70.5% above the typical sold price in the postcode. On the market in June 2016 and unlisted since — roughly 10 years.