11 Griffin Street, Newport, NP20 1GL

11 Griffin Street is a detached house in Newport (NP20 1GL). It has a recorded floor area of 53 m² (around 570 sq ft) and construction records dating it to 2021. The latest certificate (November 2021) shows a D (score 56), a step below the typical UK home. The rating has held steady at D across 2 certificates since September 2009. Between certificates, wall efficiency went from Very Poor to Very Good, window efficiency went from Good to Very Good and lighting went from Poor to Very Good; while hot-water efficiency dropped from Average to Very Poor and main heating dropped from Average to Very Poor. Main heating runs on electricity: electricity, unspecified tariff. At 53 m² this is the 37th smallest of 45 units on EPC record in the building, where floor areas span 15–89 m². The building's EPC ratings span E to B across 45 units on file.

Today's modelled estimate of £150,000 is 41.2% below the 2016 sale of £255,000, a rare downward gap that often correlates with deferred maintenance or unfinished works. On a £-per-square-foot basis, the last sale (£447/sq ft) was about 75.5% above the typical sold price in the postcode. At 53 m² the property is well over the postcode median (34 m² across 44 EPCs), placing it in the larger end of the local stock. On the market in August 2016 and unlisted since — roughly 10 years. 4 planning records sit against the property, 2 approved, 2 refused.