20 Blackwell Avenue, Guildford, GU2 8LU

20 Blackwell Avenue is a three-bedroom semi-detached house in Guildford (GU2 8LU). It has a recorded floor area of 151 m² (around 1625 sq ft), construction records dating it to 1950-1966 and council tax band D. The latest certificate (November 2018) shows a C (score 69), just inside the C band. When first surveyed in October 2008 the rating was E, the property has climbed 2 bands since. Between certificates, window efficiency went from Average to Good, hot-water efficiency went from Average to Good and main heating went from Average to Good; while lighting dropped from Average to Poor. The recommended improvements would push it to B (score 83).

At 151 m² the property is well over the postcode median (89 m² across 25 EPCs), placing it in the larger end of the local stock. Most recent transfer was November 2025 at £400,000 — fresh data. 4 planning records sit against the property, 2 approved, 1 refused. Past consents include an extension and subdivision, meaningful when judging how the property has evolved. Across 2005–2025, sale prices on this property compounded at 2.3% per year. Today's modelled estimate of £525,000 is 31.3% above the 2025 sale price. On a £-per-square-foot basis, the last sale (£246/sq ft) was about 28% below the postcode norm.