Thornlea, Flat 1, Mount Park Avenue, Harrow, HA1 3JW

Thornlea is a two-bedroom semi-detached house in Harrow (HA1 3JW). It has a recorded floor area of 115 m² (around 1240 sq ft), construction records dating it to 1900-1929 and council tax band F. At 115 m² this is the 2nd smallest of 3 units on EPC record in Thornlea, where floor areas span 110–163 m². The building's EPC ratings span E to D, with this unit at the bottom. On EPC score it ranks last in the building (52 versus a best of 67). Other recorded features include a conservatory. The latest certificate (January 2012) shows an E (score 52), well below the UK norm with real room to improve. Earlier certificates rated it D (May 2009); the latest reading is one band lower. Between certificates, roof efficiency went from Very Poor to Average, window efficiency went from Very Poor to Poor and lighting went from Very Poor to Average. The recommended improvements would push it to D (score 63). The latest certificate is from January 2012, so improvements made since then won't be reflected.

Held since April 2007 — that's 19 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. 6 planning records sit against the property, 4 approved, 0 refused. Past consents include tree works, meaningful when judging how the property has evolved. It lags the bulk of the postcode on energy efficiency (less efficient than 73% of similar EPCs). Across 1996–2007, sale prices on this property compounded at 14.4% per year. Today's modelled estimate of £645,000 is 25.2% above the 2007 sale price.