Idsworth House, Flat 3, Crasswell Street, Portsmouth, PO1 1HR

Idsworth House is a mid-terrace house in Portsmouth (PO1 1HR). It has a recorded floor area of 31 m² (around 334 sq ft), construction records dating it to 1950-1966 and council tax band A. At 31 m² this is the smallest unit on EPC record across Idsworth House (31–67 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 (68 versus a best of 76). The latest certificate (May 2026) shows a D (score 68), on the cusp of jumping into the C band. Earlier certificates rated it B (January 2010); the latest reading is 2 bands lower. Between certificates, lighting went from Very Poor to Good; while window efficiency dropped from Average to Poor and hot-water efficiency dropped from Very Good to Poor. The recommended improvements would push it to C (score 71). Main heating runs on lpg. This certificate was lodged in the last six months, so the rating reflects current condition.

At 31 m² it sits well below the postcode median (66 m² across 6 EPCs), making it one of the more compact homes locally. On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. Across 2020–2023, sale prices on this property compounded at 9.5% per year. Today's modelled estimate of £124,000 is 21% above the 2023 sale price. Most recent transfer: January 2023 at £102,500. One historical planning record sits against the property in 2021.