Horizon House, Apartment 809, Borough Road, Sunderland, SR1 1HS

Horizon House is a mid-terrace house in Sunderland (SR1 1HS). It has a recorded floor area of 16 m² (around 172 sq ft) and construction records dating it to 1983-1990. At 16 m² this is the 25th smallest of 84 units on EPC record in Horizon House, where floor areas span 14–21 m². The building's EPC ratings span D to C, with this unit at the bottom. The latest certificate (March 2024) shows a D (score 68), on the cusp of jumping into the C band. Earlier certificates rated it C (October 2019); the latest reading is one band lower. Between certificates, wall efficiency dropped from Very Good to Good and window efficiency dropped from Very Good to Average. The recommended improvements would lift it to B (score 84), a 2-band jump. Main heating runs on electricity.

On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. Across 2021–2025, sale prices on this property compounded at -22.8% per year. Today's modelled estimate of £116,000 sits 527% above the 2025 sale of £18,500. On a £-per-square-foot basis, the last sale (£107/sq ft) was about 67.8% below the postcode norm. It changed hands recently, sold October 2025 for £18,500.