11 The Grove Mill, Grove Mill Lane, Watford, WD17 3TU

11 The Grove Mill is a mid-terrace house in Watford (WD17 3TU). It has a recorded floor area of 32 m² (around 344 sq ft), construction records dating it to before 1900 and council tax band C. At 32 m² this is the smallest unit on EPC record across the building (32–68 m²). The building's EPC ratings span D to C, with this unit at the bottom. On EPC score it ranks last in the building (65 versus a best of 73). The latest certificate (March 2022) shows a D (score 65), on the cusp of jumping into the C band. Earlier certificates rated it C (February 2010); the latest reading is one band lower. Between certificates, lighting went from Very Poor to Very Good; while roof efficiency dropped from Average to Very Poor and hot-water efficiency dropped from Very Good to Good. The recommended improvements would push it to C (score 69).

At 32 m² it sits well below the postcode median (57 m² across 10 EPCs), making it one of the more compact homes locally. Across 2012–2018, sale prices on this property compounded at 11.5% per year. On a £-per-square-foot basis, the last sale (£726/sq ft) was about 60.5% above the typical sold price in the postcode. 3 planning records sit against the property, 1 approved, 1 refused. Sold August 2018 for £250,000.