3 Clock House, Tatchbury Mount, Calmore, Southampton, SO40 2RN

3 Clock House is an end-of-terrace house in Calmore, Southampton, Southampton (SO40 2RN). It has a recorded floor area of 42 m² (around 452 sq ft), construction records dating it to before 1900 and council tax band B. At 42 m² this is the smallest unit on EPC record across the building (42–62 m²). The building's EPC ratings span D to C, with this unit at the bottom. The latest certificate (March 2020) shows a D (score 68), on the cusp of jumping into the C band. Earlier certificates rated it B (April 2010); the latest reading is 2 bands lower. Between certificates, wall efficiency dropped from Good to Poor and window efficiency dropped from Good to Average. The recommended improvements would push it to C (score 75).

One planning record on file: an extension approved in 2002. Past consents include an extension, meaningful when judging how the property has evolved. The record references listed-building consent, which constrain future alterations. At 42 m² it's 23.6% smaller than the typical home in the postcode (55 m² median across 7 EPCs). It lags the bulk of the postcode on energy efficiency (less efficient than 71% of similar EPCs).