Stonehills House, Flat 21, Stonehills, Welwyn Garden City, AL8 6DL

Stonehills House is a two-bedroom mid-terrace house in Welwyn Garden City (AL8 6DL). It has a recorded floor area of 75 m² (around 807 sq ft) and construction records dating it to 1967-1975. At 75 m² this is the largest unit on EPC record across Stonehills House (23–75 m²). The building's EPC ratings span E to C across 35 units on file. Period features are noted in the property record. Our model identifies extension potential, subject to local planning policy. The latest certificate (June 2020) shows a D (score 67), on the cusp of jumping into the C band. When first surveyed in September 2016 the rating was F, the property has climbed 2 bands since. Between certificates, wall efficiency dropped from Very Good to Good and window efficiency dropped from Very Good to Good. The recommended improvements would lift it to B (score 81), a 2-band jump. Main heating runs on electricity.

At 75 m² the property is well over the postcode median (53 m² across 34 EPCs), placing it in the larger end of the local stock. It changed hands recently, sold November 2025 for £260,000. Across 2017–2025, sale prices on this property compounded at -1.5% per year. Today's modelled estimate of £289,000 is 11.2% above the 2025 sale price. On a £-per-square-foot basis, the last sale (£322/sq ft) was about 24.9% below the postcode norm.