21 Marine Gate Mansions, Promenade, Southport, PR9 0AU

21 Marine Gate Mansions is a two-bedroom detached house in Southport (PR9 0AU). It has a recorded floor area of 125 m² (around 1345 sq ft), construction records dating it to before 1900 and council tax band G. It is a listed building, which means external alterations are tightly controlled but it may qualify for heritage tax reliefs. Other recorded features include notable views. At 125 m² this is the 7th smallest of 31 units on EPC record in the building, where floor areas span 81–297 m². The building's EPC ratings span D to B, with this unit at the bottom. On EPC score it ranks last in the building (55 versus a best of 86). The latest certificate (February 2009) shows a D (score 55), a step below the typical UK home. The latest certificate is from February 2009, so improvements made since then won't be reflected.

Untraded for 20 years, with the last transfer in September 2006. At 125 m² it's 21.4% smaller than the typical home in the postcode (159 m² median across 30 EPCs). On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. Across 2003–2006, sale prices on this property compounded at 15.8% per year. On a £-per-square-foot basis, the last sale (£286/sq ft) was about 56.7% above the typical sold price in the postcode.