21 Mayfair House, Piccadilly, York, YO1 9QJ

21 Mayfair House is a two-bedroom mid-terrace house in York (YO1 9QJ). It has a recorded floor area of 76 m² (around 818 sq ft), construction records dating it to 1991-1995 and council tax band D. The latest certificate (January 2016) returns a B (score 84), comfortably above the UK average. The rating has held steady at B across 2 certificates since April 2013. Between certificates, window efficiency dropped from Good to Average. Main heating runs on electricity. The latest certificate is from January 2016, so improvements made since then won't be reflected. At 76 m² this is the 19th smallest of 24 units on EPC record in the building, where floor areas span 43–119 m². The building's EPC ratings span D to B, with this unit at the top. Other recorded features include notable views.

At 76 m² it's 16.9% larger than the typical home in the postcode (65 m² median across 23 EPCs). Across 2000–2016, sale prices on this property compounded at 4.9% per year. Today's modelled estimate of £308,000 is 24.7% above the 2016 sale price. On a £-per-square-foot basis, the last sale (£302/sq ft) was about 27.3% above the typical sold price in the postcode. On the market in March 2016 and unlisted since — roughly 10 years.