12a, Castlewood Road, Cockfosters, Barnet, EN4 9DG

12a is a two-bedroom semi-detached house in Cockfosters, Barnet, Barnet (EN4 9DG). It has a recorded floor area of 67 m² (around 721 sq ft), construction records dating it to 1950-1966 and council tax band C. At 67 m² this is the 11th smallest of 21 units on EPC record in the building, where floor areas span 62–71 m². The building's EPC ratings span D to C, with this unit at the bottom. On EPC score it ranks last in the building (64 versus a best of 77). The latest certificate (January 2025) shows a D (score 64), on the cusp of jumping into the C band. Earlier certificates rated it C (July 2014); the latest reading is one band lower. Between certificates, lighting went from Very Poor to Very Good; while wall efficiency dropped from Good to Average and roof efficiency dropped from Good to Very Poor. The recommended improvements would push it to C (score 77).

It lags the bulk of the postcode on energy efficiency (less efficient than 85% of similar EPCs). Across 2008–2015, sale prices on this property compounded at 4.5% per year. Today's modelled estimate of £373,000 is 26% above the 2015 sale price. On a £-per-square-foot basis, the last sale (£410/sq ft) was about 33.5% above the typical sold price in the postcode. Last sold in April 2015, so it's been off the market for around 11 years.