305a, High Street, Slough, SL1 1BD

305a is a semi-detached house in Slough (SL1 1BD). It has a recorded floor area of 58 m² (around 624 sq ft), construction records dating it to 1976-1982 and council tax band B. The latest certificate (May 2023) shows a D (score 68), on the cusp of jumping into the C band. When first surveyed in March 2011 the rating was G, the property has climbed 3 bands since. Between certificates, wall efficiency went from Poor to Average, roof efficiency went from Very Poor to Good and hot-water efficiency went from Very Poor to Good. The recommended improvements would push it to C (score 71). At 58 m² this is the 20th smallest of 34 units on EPC record in the building, where floor areas span 21–95 m². The building's EPC ratings span G to C across 34 units on file.

Today's modelled estimate of £208,000 is 84.2% below the 2014 sale of £1,320,000, a rare downward gap that often correlates with deferred maintenance or unfinished works. On a £-per-square-foot basis, the last sale (£2,114/sq ft) was about 322% above the typical sold price in the postcode. At 58 m² it's 16% larger than the typical home in the postcode (50 m² median across 33 EPCs). On the market in October 2014 and unlisted since — roughly 12 years.