21 Admiralty Tower, Queen Street, Portsmouth, PO1 3GA

21 Admiralty Tower is a one-bedroom semi-detached house in Portsmouth (PO1 3GA). It has a recorded floor area of 63 m² (around 678 sq ft), construction records dating it to 2003-2006 and council tax band C. The latest certificate (February 2019) shows a C (score 80), near the top of the C band. Earlier certificates rated it B (February 2009); the latest reading is one band lower. Between certificates, lighting went from Poor to Good; while hot-water efficiency dropped from Average to Poor. The recommended improvements would push it to B (score 84). Main heating runs on electricity. At 63 m² this is the 31st smallest of 62 units on EPC record in the building, where floor areas span 27–93 m². The building's EPC ratings span D to B across 62 units on file. Other recorded features include a balcony and notable views.

It hasn't traded since January 2009, a hold of 18 years that's notably long for the area. That sale fell during the post-crash dip, which often skews comparisons against later neighbouring sales. Today's modelled estimate of £172,000 is 22.9% above the 2009 sale price. On a £-per-square-foot basis, the last sale (£206/sq ft) was about 42.2% below the postcode norm.