16 Arethusa House, Gunwharf Quays, Portsmouth, PO1 3TQ

16 Arethusa House is a two-bedroom mid-terrace house in Portsmouth (PO1 3TQ). It has a recorded floor area of 81 m² (around 872 sq ft), construction records dating it to 1996-2002 and council tax band E. The latest certificate (January 2020) shows a D (score 68), on the cusp of jumping into the C band. Earlier certificates rated it C (November 2009); the latest reading is one band lower. Between certificates, lighting went from Poor to Very Good; while hot-water efficiency dropped from Good to Poor and main heating dropped from Good to Very Poor. Main heating runs on electricity. At 81 m² this is the 15th smallest of 52 units on EPC record in the building, where floor areas span 59–171 m². The building's EPC ratings span E to B across 52 units on file. Other recorded features include a conservatory and outbuildings.

It hasn't traded since January 2007, a hold of 19 years that's notably long for the area. That sale landed at the peak of the pre-credit-crunch market, which is a useful reference point when interpreting the price. It lags the bulk of the postcode on energy efficiency (less efficient than 78% of similar EPCs). Across 2002–2007, sale prices on this property compounded at 8.6% per year. Today's modelled estimate of £338,000 is 38% above the 2007 sale price. On a £-per-square-foot basis, the last sale (£281/sq ft) was about 16.4% below the postcode norm.