20 Neptune Apartments, Phoebe Road, Copper Quarter, Pentrechwyth, Swansea, SA1 7FL

20 Neptune Apartments is an end-of-terrace house in Pentrechwyth, Swansea, Swansea (SA1 7FL). It has a recorded floor area of 38 m² (around 409 sq ft) and construction records dating it to 2003-2006. The latest certificate (December 2025) shows a C (score 69), just inside the C band. The rating has held steady at C across 2 certificates since May 2015. Between certificates, wall efficiency dropped from Very Good to Good and window efficiency dropped from Good to Average. The recommended improvements would push it to B (score 81). Main heating runs on electricity. At 38 m² this is the 13th smallest of 34 units on EPC record in the building, where floor areas span 33–81 m². The building's EPC ratings span E to B across 34 units on file.

It hasn't traded since December 2007, a hold of 19 years that's notably long for the area. That sale landed at the peak of the pre-credit-crunch market, which is a useful reference point when interpreting the price. On a £-per-square-foot basis, the last sale (£286/sq ft) was about 21.9% above the typical sold price in the postcode.