11a, Chalk Hill, Watford, WD19 4BL

11a is a two-bedroom end-of-terrace house in Watford (WD19 4BL). It has a recorded floor area of 65 m² (around 700 sq ft), construction records dating it to 1900-1929 and council tax band B. The latest certificate (November 2018) shows a D (score 65), on the cusp of jumping into the C band. The rating has held steady at D across 2 certificates since December 2008. Between certificates, window efficiency went from Average to Good and lighting went from Poor to Very Good. The recommended improvements would push it to C (score 77). At 65 m² this is the 10th smallest of 15 units on EPC record in the building, where floor areas span 33–189 m². The building's EPC ratings span F to C across 15 units on file.

Untraded for 23 years, with the last transfer in October 2003. At 65 m² the property is well over the postcode median (48 m² across 14 EPCs), placing it in the larger end of the local stock. Across 2000–2003, sale prices on this property compounded at 10.2% per year. Today's modelled estimate of £280,000 sits 187.2% above the 2003 sale of £97,500. On a £-per-square-foot basis, the last sale (£139/sq ft) was about 28.8% below the postcode norm.