21a, Gratwicke Road, Worthing, BN11 4BH

21a is a semi-detached house in Worthing (BN11 4BH). It has a recorded floor area of 36 m² (around 388 sq ft) and construction records dating it to 2024. The latest certificate (April 2025) shows a C (score 78), near the top of the C band. When first surveyed in July 2010 the rating was G, the property has climbed 4 bands since. Between certificates, wall efficiency went from Poor to Good, window efficiency went from Very Poor to Very Good and hot-water efficiency went from Average to Very Good. At 36 m² this is the 13th smallest of 65 units on EPC record in the building, where floor areas span 11–185 m². The building's EPC ratings span G to B across 65 units on file.

Today's modelled estimate of £161,000 is 55.9% below the 2019 sale of £365,000, a rare downward gap that often correlates with deferred maintenance or unfinished works. On a £-per-square-foot basis, the last sale (£942/sq ft) was about 385.4% above the typical sold price in the postcode. At 36 m² it sits well below the postcode median (67 m² across 64 EPCs), making it one of the more compact homes locally. Its energy rating outperforms most of the postcode (better than 70% of similar EPCs). Last sale on file: £365,000 in December 2019.