21c, Ash Tree Road, Southampton, SO18 1LY

21c is a one-bedroom semi-detached house in Southampton (SO18 1LY). It has a recorded floor area of 40 m² (around 431 sq ft), construction records dating it to 1967-1975 and council tax band A. At 40 m² this is the smallest unit on EPC record across the building (40–158 m²). The building's EPC ratings span E to C across 25 units on file. The latest certificate (September 2024) shows a D (score 57), a step below the typical UK home. When first surveyed in January 2013 the rating was E, the property has climbed 1 band since. Between certificates, hot-water efficiency went from Very Poor to Poor and lighting went from Very Poor to Very Good; while window efficiency dropped from Good to Average. The recommended improvements would push it to C (score 75). Main heating runs on electricity.

At 40 m² it sits well below the postcode median (99 m² across 24 EPCs), making it one of the more compact homes locally. 1 bedrooms is on the smaller side for this postcode, where 3 is the typical count. Last changed hands 13 years ago, in February 2013. Across the public record there are 4 sales, relatively high churn for a single property. Across 1998–2013, sale prices on this property compounded at 7.9% per year. Today's modelled estimate of £142,000 is 40.6% above the 2013 sale price. On a £-per-square-foot basis, the last sale (£235/sq ft) was about 41.6% above the typical sold price in the postcode.