9 De Soissons Close, Welwyn Garden City, AL8 6YX

9 De Soissons Close is a two-bedroom semi-detached house in Welwyn Garden City (AL8 6YX). It has a recorded floor area of 59 m² (around 635 sq ft), construction records dating it to 2003-2006 and council tax band C. The latest certificate (April 2021) returns a B (score 83), comfortably above the UK average. The rating has held steady at B across 2 certificates since February 2011. Between certificates, lighting went from Average to Very Good; while hot-water efficiency dropped from Very Good to Good and main heating dropped from Very Good to Good. At 59 m² this is the 5th smallest of 18 units on EPC record in the building, where floor areas span 49–103 m². The building's EPC ratings span C to B, with this unit at the top. On EPC score it ranks first in the building (83 versus a worst of 73). The property has solar panels on record, all of which lower running costs and tend to lift resale appeal.

Its energy rating outperforms most of the postcode (better than 71% of similar EPCs). Across 2005–2016, sale prices on this property compounded at 3.4% per year. On a £-per-square-foot basis, the last sale (£441/sq ft) was about 40.5% above the typical sold price in the postcode. Last changed hands 10 years ago, in September 2016.