11 Sonata House, Lock Approach, Port Solent, Portsmouth, PO6 4UZ

11 Sonata House is a two-bedroom mid-terrace house in Port Solent, Portsmouth, Portsmouth (PO6 4UZ). It has a recorded floor area of 71 m² (around 764 sq ft), construction records dating it to 1996-2002 and council tax band F. The latest certificate (April 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, hot-water efficiency went from Poor to Average, lighting went from Average to Very Good and main heating went from Poor to Average. Main heating runs on electricity. At 71 m² this is the 2nd smallest of 10 units on EPC record in the building, where floor areas span 70–93 m². The building's EPC ratings span D to B across 10 units on file. Other recorded features include a balcony and notable views.

Held since December 2003 — that's 23 years off the open market, well above the local norm. Across 2000–2003, sale prices on this property compounded at 9.7% per year. Today's modelled estimate of £375,000 is 29.3% above the 2003 sale price. On a £-per-square-foot basis, the last sale (£379/sq ft) was about 19.6% above the typical sold price in the postcode.