Flat 3, 47 Chalk Hill, Watford, WD19 4BU

Flat 3 is a one-bedroom semi-detached house in Watford (WD19 4BU). It has a recorded floor area of 20 m² (around 215 sq ft), construction records dating it to before 1900 and council tax band B. At 20 m² this is the smallest unit on EPC record across the building (20–41 m²). The building's EPC ratings span D to C, with this unit at the top. On EPC score it ranks first in the building (73 versus a worst of 59). Period features are noted in the property record. The latest certificate (February 2021) shows a C (score 73). When first surveyed in January 2018 the rating was D, the property has climbed 1 band since. Between certificates, roof efficiency went from Very Poor to Very Good and lighting went from Good to Very Good; while hot-water efficiency dropped from Very Good to Good.

At 20 m² it sits well below the postcode median (98 m² across 9 EPCs), making it one of the more compact homes locally. On energy efficiency it sits in the top 10% of properties in this postcode. Across 2018–2021, sale prices on this property compounded at 9.8% per year. On a £-per-square-foot basis, the last sale (£1,161/sq ft) was about 407.5% above the typical sold price in the postcode. Most recent transfer: July 2021 at £250,000. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.