23 Mayfair House, Piccadilly, York, YO1 9QJ

23 Mayfair House is a one-bedroom semi-detached house in York (YO1 9QJ). It has a recorded floor area of 47 m² (around 506 sq ft), construction records dating it to 1996-2002 and council tax band D. The latest certificate (June 2021) shows a C (score 77), near the top of the C band. The rating has held steady at C across 2 certificates since October 2008. Between certificates, lighting went from Very Poor to Poor and main heating went from Poor to Average. The recommended improvements would push it to B (score 81). Main heating runs on electricity. At 47 m² this is the 4th 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 across 24 units on file. Other recorded features include a balcony and outbuildings.

Across 2000–2021, sale prices on this property compounded at 3.4% per year. On a £-per-square-foot basis, the last sale (£356/sq ft) was about 49.3% above the typical sold price in the postcode. At 47 m² it's 27.7% smaller than the typical home in the postcode (65 m² median across 23 EPCs). Last sale on file: £180,000 in November 2021. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.