Keystone House, Flat 3, 60 London Road, St Albans, AL1 1NG

Keystone House is a one-bedroom end-of-terrace house in St Albans (AL1 1NG). It has a recorded floor area of 44 m² (around 474 sq ft) and construction records dating it to 1996-2002. The latest certificate (June 2023) shows a D (score 61), on the cusp of jumping into the C band. When first surveyed in March 2016 the rating was E, the property has climbed 1 band since. Between certificates, wall efficiency went from Poor to Good; while window efficiency dropped from Very Good to Average and hot-water efficiency dropped from Poor to Very Poor. Main heating runs on electricity. At 44 m² this is the 6th smallest of 24 units on EPC record in Keystone House, where floor areas span 38–109 m². The building's EPC ratings span E to C across 24 units on file.

On a £-per-square-foot basis, the last sale (£707/sq ft) was about 33.2% above the typical sold price in the postcode. On the market in March 2016 and unlisted since — roughly 10 years. At 44 m² it's 16.2% smaller than the typical home in the postcode (53 m² median across 42 EPCs).