21 Ayresome Street, Middlesbrough, TS1 4NL

21 Ayresome Street is a mid-terrace house in Middlesbrough (TS1 4NL). It has a recorded floor area of 15 m² (around 161 sq ft), construction records dating it to 1900-1929 and council tax band A. At 15 m² this is the smallest unit on EPC record across the building (15–153 m²). The building's EPC ratings span G to C across 31 units on file. The latest certificate (December 2020) shows an E (score 40), well below the UK norm with real room to improve. When first surveyed in March 2014 the rating was F, the property has climbed 1 band since. Between certificates, lighting went from Good to Very Good and main heating went from Very Poor to Average; while wall efficiency dropped from Poor to Very Poor and window efficiency dropped from Good to Average. The recommended improvements would push it to D (score 63). Main heating runs on electricity.

It hasn't traded since September 2001, a hold of 25 years that's notably long for the area. Today's modelled estimate of £116,000 sits 364% above the 2001 sale of £25,000. On a £-per-square-foot basis, the last sale (£155/sq ft) was about 108.4% above the typical sold price in the postcode. At 15 m² it sits well below the postcode median (89 m² across 30 EPCs), making it one of the more compact homes locally.