21 Chestnut Avenue, Rickmansworth, WD3 4HA

21 Chestnut Avenue is a detached house in Rickmansworth (WD3 4HA). It has a recorded floor area of 449 m² (around 4833 sq ft) and construction records dating it to 2012 onwards. The latest certificate (April 2025) returns a B (score 82), comfortably above the UK average. The rating has held steady at B across 2 certificates since February 2015. Between certificates, roof efficiency went from Good to Very Good.

It hasn't traded since December 2003, a hold of 22 years that's notably long for the area. 12 planning records sit against the property, 8 approved, 1 refused, 2 pending. Past consents include an extension and partial demolition, meaningful when judging how the property has evolved. An active application for an extension is awaiting a decision. At 449 m² the property is well over the postcode median (201 m² across 16 EPCs), placing it in the larger end of the local stock. On energy efficiency it sits in the top 10% of properties in this postcode. Across 2000–2003, sale prices on this property compounded at 9.3% per year. Today's modelled estimate of £2,811,000 sits 325.9% above the 2003 sale of £660,000. On a £-per-square-foot basis, the last sale (£137/sq ft) was about 51.3% below the postcode norm.