23 Armstrong Close, Borehamwood, WD6 1RR

23 Armstrong Close is a one-bedroom end-of-terrace house in Borehamwood (WD6 1RR). It has a recorded floor area of 39 m² (around 420 sq ft), construction records dating it to 1967-1975 and council tax band C. The latest certificate (November 2020) shows a D (score 63), on the cusp of jumping into the C band. When first surveyed in August 2010 the rating was E, the property has climbed 1 band since. Between certificates, lighting went from Good to Very Good and main heating went from Very Poor to Average; while wall efficiency dropped from Good to Poor and hot-water efficiency dropped from Average to Very Poor. Main heating runs on electricity. At 39 m² this is the 2nd smallest of 29 units on EPC record in the building, where floor areas span 32–120 m². The building's EPC ratings span D to B, with this unit at the bottom.

At 39 m² it sits well below the postcode median (59 m² across 28 EPCs), making it one of the more compact homes locally. It lags the bulk of the postcode on energy efficiency (less efficient than 89% of similar EPCs). Across 2001–2014, sale prices on this property compounded at 4.6% per year. Today's modelled estimate of £231,000 is 24.9% above the 2014 sale price. On a £-per-square-foot basis, the last sale (£441/sq ft) was about 67% above the typical sold price in the postcode. Last sold in December 2014, so it's been off the market for around 12 years.