Windsor House, Flat 7, Howardsgate, Welwyn Garden City, AL8 6DJ

Windsor House is a mid-terrace house in Welwyn Garden City (AL8 6DJ). It has a recorded floor area of 59 m² (around 635 sq ft), construction records dating it to 2012-2021 and council tax band C. At 59 m² this is the 5th smallest of 8 units on EPC record in Windsor House, where floor areas span 47–67 m². The building's EPC ratings span E to C, with this unit at the top. On EPC score it ranks first in the building (72 versus a worst of 52). The latest certificate (December 2025) shows a C (score 72). When first surveyed in December 2015 the rating was D, the property has climbed 1 band since. Between certificates, wall efficiency went from Good to Very Good and main heating went from Very Poor to Good; while window efficiency dropped from Good to Average and lighting dropped from Very Good to Good. Main heating runs on electricity. This certificate was lodged in the last six months, so the rating reflects current condition.

On energy efficiency it sits in the top 10% of properties in this postcode. Across 2017–2020, sale prices on this property compounded at 4.9% per year. On a £-per-square-foot basis, the last sale (£482/sq ft) was about 16.2% above the typical sold price in the postcode. Sold November 2020 for £306,229.