28a, Queen Street, Tongwynlais, Cardiff, CF15 7NL

28a is a four-bedroom detached house in Tongwynlais, Cardiff, Cardiff (CF15 7NL). It has a recorded floor area of 214 m² (around 2303 sq ft) and construction records dating it to before 1900. The latest certificate (May 2021) shows a D (score 65), on the cusp of jumping into the C band. When first surveyed in September 2009 the rating was E, the property has climbed 1 band since. Between certificates, window efficiency went from Average to Good, hot-water efficiency went from Very Poor to Good and lighting went from Good to Very Good; while wall efficiency dropped from Good to Poor and roof efficiency dropped from Good to Average. The recommended improvements would lift it to B (score 83), a 2-band jump. Period features are noted in the property record. Our model identifies extension potential, subject to local planning policy. The home occupies a corner plot.

At 214 m² the property is well over the postcode median (87 m² across 15 EPCs), placing it in the larger end of the local stock. Across 2019–2021, sale prices on this property compounded at 23.4% per year. Today's modelled estimate of £581,000 is 19.8% above the 2021 sale price. On a £-per-square-foot basis, the last sale (£211/sq ft) was about 23.3% above the typical sold price in the postcode. Last sale on file: £485,000 in July 2021. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.