1 Castle Lofts, Castle Street, Swansea, SA1 1HF

1 Castle Lofts is an end-of-terrace house in Swansea (SA1 1HF). It has a recorded floor area of 104 m² (around 1119 sq ft) and construction records dating it to before 1900. At 104 m² this is the largest unit on EPC record across the building (55–104 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 (64 versus a best of 81). The latest certificate (February 2020) shows a D (score 64), on the cusp of jumping into the C band. Earlier certificates rated it C (February 2018); the latest reading is one band lower. Between certificates, lighting went from Very Poor to Poor; while wall efficiency dropped from Good to Poor and window efficiency dropped from Good to Average. The recommended improvements would push it to C (score 73).

At 104 m² the property is well over the postcode median (72 m² across 7 EPCs), placing it in the larger end of the local stock. On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. Across 2002–2020, sale prices on this property compounded at 0.6% per year. Today's modelled estimate of £196,000 sits 96% above the 2020 sale of £100,000. On a £-per-square-foot basis, the last sale (£89/sq ft) was about 23.8% below the postcode norm. Most recent transfer: September 2020 at £100,000.