Opera House, Flat 4, 23 Derby Street, Weymouth, DT4 7HX

Opera House is a two-bedroom mid-terrace house in Weymouth (DT4 7HX). It has a recorded floor area of 60 m² (around 646 sq ft), construction records dating it to 1983-1990 and council tax band C. At 60 m² this is the 4th smallest of 6 units on EPC record in Opera House, where floor areas span 41–61 m². The building's EPC ratings span E to B, with this unit at the bottom. On EPC score it ranks last in the building (50 versus a best of 83). The latest certificate (June 2019) shows an E (score 50), well below the UK norm with real room to improve. Earlier certificates rated it B (June 2009); the latest reading is 3 bands lower. Between certificates, window efficiency dropped from Good to Average and hot-water efficiency dropped from Average to Poor. Main heating runs on electricity.

Held since October 2005 — that's 21 years off the open market, well above the local norm. It lags the bulk of the postcode on energy efficiency (less efficient than 89% of similar EPCs). On a £-per-square-foot basis, the last sale (£225/sq ft) was about 47.7% above the typical sold price in the postcode.