12 Holm Oak Park, Hagden Lane, Watford, WD18 0XP

12 Holm Oak Park is a mid-terrace house in Watford (WD18 0XP). It has a recorded floor area of 33 m² (around 355 sq ft), construction records dating it to 1983-1990 and council tax band B. The latest certificate (January 2025) shows a D (score 64), on the cusp of jumping into the C band. Earlier certificates rated it C (October 2008); the latest reading is one band lower. Between certificates, window efficiency went from Average to Good, hot-water efficiency went from Very Poor to Poor and lighting went from Average to Very Good; while main heating dropped from Poor to Very Poor. The recommended improvements would push it to C (score 79). Main heating runs on electricity. At 33 m² this is the 11th smallest of 37 units on EPC record in the building, where floor areas span 27–67 m². The building's EPC ratings span E to B across 37 units on file.

It lags the bulk of the postcode on energy efficiency (less efficient than 81% of similar EPCs). On a £-per-square-foot basis, the last sale (£493/sq ft) was about 123.1% above the typical sold price in the postcode. On the market in March 2017 and unlisted since — roughly 9 years.