Flat 1, 16 Marlborough Road, Cardiff, CF23 5BX

Flat 1 is a mid-terrace house in Cardiff (CF23 5BX). It has a recorded floor area of 29 m² (around 312 sq ft), construction records dating it to 2007 onwards and council tax band B. At 29 m² this is the 2nd smallest of 6 units on EPC record in the building, where floor areas span 29–71 m². The building's EPC ratings span D to C, with this unit at the bottom. The latest certificate (September 2010) shows a D (score 62), on the cusp of jumping into the C band. The rating has held steady at D across 2 certificates since September 2010. Between certificates, hot-water efficiency dropped from Average to Very Poor. The recommended improvements would lift it to B (score 81), a 2-band jump. Main heating runs on electricity. The latest certificate is from September 2010, so improvements made since then won't be reflected.

Held since May 2006 — that's 20 years off the open market, well above the local norm. At 29 m² it sits well below the postcode median (59 m² across 71 EPCs), making it one of the more compact homes locally. Across 1998–2006, sale prices on this property compounded at 12.9% per year. Today's modelled estimate of £180,000 is 24.1% above the 2006 sale price. On a £-per-square-foot basis, the last sale (£464/sq ft) was about 202.3% above the typical sold price in the postcode.