Heron House 1a, Flat 1, Cottage Grove, Surbiton, KT6 4JH

Heron House 1a is a two-bedroom semi-detached house in Surbiton (KT6 4JH). It has a recorded floor area of 68 m² (around 732 sq ft), construction records dating it to 1983-1990 and council tax band C. At 68 m² this is the 7th smallest of 10 units on EPC record in Heron House 1a, where floor areas span 42–83 m². The building's EPC ratings span E to C, with this unit at the bottom. On EPC score it ranks last in the building (47 versus a best of 76). Period features are noted in the property record. The latest certificate (December 2020) shows an E (score 47), well below the UK norm with real room to improve. Earlier certificates rated it D (December 2010); the latest reading is one band lower. Between certificates, window efficiency went from Very Poor to Good, hot-water efficiency went from Very Poor to Poor and lighting went from Very Poor to Very Good; while main heating dropped from Poor to Very Poor. The recommended improvements would push it to D (score 64). Main heating runs on electricity.

Across 2011–2025, sale prices on this property compounded at -2.8% per year. Today's modelled estimate of £349,000 sits 115.4% above the 2025 sale of £162,000. On a £-per-square-foot basis, the last sale (£221/sq ft) was about 50.8% below the postcode norm. Most recent transfer was March 2025 at £162,000 — fresh data. It lags the bulk of the postcode on energy efficiency (less efficient than 89% of similar EPCs).