1 Siddons House, Cottage Close, Harrow, HA2 0HG

1 Siddons House is a detached house in Harrow (HA2 0HG). It has a recorded floor area of 74 m² (around 797 sq ft), construction records dating it to 1900-1929 and council tax band F. At 74 m² this is the 4th smallest of 5 units on EPC record in the building, where floor areas span 60–107 m². The building's EPC ratings span D to C, with this unit at the bottom. The latest certificate (April 2025) 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 May 2009. Between certificates, lighting went from Poor to Very Good; while hot-water efficiency dropped from Very Good to Good and main heating dropped from Very Good to Good. The recommended improvements would push it to C (score 71).

It hasn't traded since August 2005, a hold of 21 years that's notably long for the area. On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. 23 planning records sit against the property, 4 approved, 4 refused. Past consents include an extension, meaningful when judging how the property has evolved. The record references listed-building consent and conservation-area consent, which constrain future alterations. Today's modelled estimate of £514,000 is 46.9% above the 2005 sale price.