1a, Collingwood Road, Northampton, NN1 4QZ

1a is a two-bedroom detached house in Northampton (NN1 4QZ). It has a recorded floor area of 88 m² (around 947 sq ft), construction records dating it to 2007 onwards and council tax band C. The latest certificate (June 2015) shows a D (score 68), on the cusp of jumping into the C band. The recommended improvements would push it to C (score 80). The latest certificate is from June 2015, so improvements made since then won't be reflected.

Held since October 2008 — that's 18 years off the open market, well above the local norm. That sale landed at the peak of the pre-credit-crunch market, which is a useful reference point when interpreting the price. Today's modelled estimate of £250,000 is 42.9% above the 2008 sale price. On a £-per-square-foot basis, the last sale (£185/sq ft) was about 30.1% above the typical sold price in the postcode.