31a, Grantham Avenue, Hamble, Southampton, SO31 4JX

31a is a detached house in Hamble, Southampton, Southampton (SO31 4JX). It has a recorded floor area of 75 m² (around 807 sq ft), construction records dating it to 1967-1975 and council tax band B. At 75 m² this is the 13th smallest of 32 units on EPC record in the building, where floor areas span 46–143 m². The building's EPC ratings span E to C, with this unit at the bottom. On EPC score it ranks last in the building (52 versus a best of 80). The latest certificate (July 2015) shows an E (score 52), well below the UK norm with real room to improve. The recommended improvements would lift it to C (score 69), a 2-band jump. The latest certificate is from July 2015, so improvements made since then won't be reflected.

It hasn't traded since May 1997, a hold of 29 years that's notably long for the area. Only one transfer is on record with HM Land Registry, suggesting it has stayed in the same hands for a long time. On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. Today's modelled estimate of £184,000 sits 308.9% above the 1997 sale of £45,000. On a £-per-square-foot basis, the last sale (£56/sq ft) was about 69.3% below the postcode norm.