17 Cottesbrooke Gardens, Northampton, NN4 0DE

17 Cottesbrooke Gardens is a four-bedroom detached house in Northampton (NN4 0DE). It has a recorded floor area of 118 m² (around 1270 sq ft), construction records dating it to 1996-2002 and council tax band E. The latest certificate (September 2015) shows a D (score 57), a step below the typical UK home. The rating has held steady at D across 3 certificates since April 2009. Between certificates, roof efficiency went from Average to Good and lighting went from Average to Good; while wall efficiency dropped from Good to Very Poor. The recommended improvements would lift it to B (score 84), a 2-band jump. The latest certificate is from September 2015, so improvements made since then won't be reflected.

Held since October 2009 — that's 17 years off the open market, well above the local norm. Across the public record there are 4 sales, relatively high churn for a single property. That sale fell during the post-crash dip, which often skews comparisons against later neighbouring sales. Across 1998–2009, sale prices on this property compounded at 5.3% per year. Today's modelled estimate of £390,000 sits 105.3% above the 2009 sale of £190,000. On a £-per-square-foot basis, the last sale (£150/sq ft) was about 24.8% above the typical sold price in the postcode.