13 Guernsey House, Pioneer Way, Watford, WD18 6ST

13 Guernsey House is a one-bedroom end-of-terrace house in Watford (WD18 6ST). It has a recorded floor area of 29 m² (around 312 sq ft), construction records dating it to 1996-2002 and council tax band B. At 29 m² this is the smallest unit on EPC record across the building (29–62 m²). The building's EPC ratings span E to B across 32 units on file. The latest certificate (August 2023) shows a D (score 62), on the cusp of jumping into the C band. The rating has held steady at D across 2 certificates since April 2011. Between certificates, lighting went from Very Poor to Very Good; while window efficiency dropped from Good to Average and main heating dropped from Poor to Very Poor. The recommended improvements would push it to C (score 80). Main heating runs on to be used only when there is no heating/hot.

Across 1997–2012, sale prices on this property compounded at 6.7% per year. Today's modelled estimate of £171,000 sits 57.6% above the 2012 sale of £108,500. On a £-per-square-foot basis, the last sale (£348/sq ft) was about 84.1% above the typical sold price in the postcode. Last sold in November 2012, so it's been off the market for around 14 years. Across the public record there are 5 sales, relatively high churn for a single property. At 29 m² it's 25.6% smaller than the typical home in the postcode (39 m² median across 31 EPCs). It lags the bulk of the postcode on energy efficiency (less efficient than 81% of similar EPCs).