12a, Holywell Hill, St Albans, AL1 1BZ

12a is a two-bedroom detached house in St Albans (AL1 1BZ). It has a recorded floor area of 65 m² (around 700 sq ft), construction records dating it to before 1900 and council tax band C. The latest certificate (January 2026) shows a D (score 65), on the cusp of jumping into the C band. When first surveyed in July 2010 the rating was E, the property has climbed 1 band since. Between certificates, wall efficiency went from Very Poor to Good and lighting went from Average to Good; while window efficiency dropped from Poor to Very Poor and hot-water efficiency dropped from Good to Average. The recommended improvements would push it to C (score 80). Main heating runs on electricity. This certificate was lodged in the last six months, so the rating reflects current condition. At 65 m² this is the 15th smallest of 31 units on EPC record in the building, where floor areas span 25–161 m². The building's EPC ratings span F to C across 31 units on file.

Today's modelled estimate of £433,000 is 25.5% above the 2015 sale price. On a £-per-square-foot basis, the last sale (£493/sq ft) was about 22.2% above the typical sold price in the postcode. Last sold in May 2015, so it's been off the market for around 11 years.