18 The Ridings, Grange Park, Northampton, NN4 5BN

18 The Ridings is a four-bedroom mid-terrace house in Grange Park, Northampton, Northampton (NN4 5BN). It has a recorded floor area of 144 m² (around 1550 sq ft), construction records dating it to 1996-2002 and council tax band D. The latest certificate (April 2014) shows a D (score 66), on the cusp of jumping into the C band. Earlier certificates rated it C (May 2009); the latest reading is one band lower. Between certificates, lighting went from Very Poor to Poor; while wall efficiency dropped from Good to Very Poor and roof efficiency dropped from Good to Average. The recommended improvements would lift it to B (score 86), a 2-band jump. The latest certificate is from April 2014, so improvements made since then won't be reflected.

Held since May 2005 — that's 21 years off the open market, well above the local norm. Across 2002–2005, sale prices on this property compounded at 10.9% per year. Today's modelled estimate of £333,000 sits 64.6% above the 2005 sale of £202,350. On a £-per-square-foot basis, the last sale (£131/sq ft) was about 23.8% below the postcode norm. It lags the bulk of the postcode on energy efficiency (less efficient than 82% of similar EPCs).