300a, High Street, Sutton, SM1 1PQ

300a is an end-of-terrace house in Sutton (SM1 1PQ). It has a recorded floor area of 24 m² (around 258 sq ft), construction records dating it to 1900-1929 and council tax band A. The latest certificate (December 2022) shows a D (score 57), a step below the typical UK home. The rating has held steady at D across 2 certificates since July 2009. Between certificates, lighting went from Good to Very Good; while roof efficiency dropped from Average to Very Poor. At 24 m² this is the 2nd smallest of 6 units on EPC record in 300a, where floor areas span 21–41 m². The building's EPC ratings span E to C across 6 units on file.

At 24 m² it sits well below the postcode median (48 m² across 23 EPCs), making it one of the more compact homes locally. Across 1999–2015, sale prices on this property compounded at 12.7% per year. Today's modelled estimate of £550,000 is 17% above the 2015 sale price. On a £-per-square-foot basis, the last sale (£1,819/sq ft) was about 799.1% above the typical sold price in the postcode. Last sold in October 2015, so it's been off the market for around 11 years. One historical planning record sits against the property in 2009.