20 Gerddi Rheidol, Trefechan, Aberystwyth, SY23 1DB

20 Gerddi Rheidol is a two-bedroom end-of-terrace house in Trefechan, Aberystwyth, Aberystwyth (SY23 1DB). It has a recorded floor area of 66 m² (around 710 sq ft), construction records dating it to 1991-1995 and council tax band C. The latest certificate (December 2016) shows a D (score 63), on the cusp of jumping into the C band. Earlier certificates rated it C (August 2013); the latest reading is one band lower. Between certificates, hot-water efficiency dropped from Average to Very Poor and lighting dropped from Very Good to Good. The recommended improvements would push it to C (score 74). Main heating runs on electricity. At 66 m² this is the 25th smallest of 40 units on EPC record in the building, where floor areas span 50–109 m². The building's EPC ratings span E to B across 40 units on file. Other recorded features include notable views.

On the market in October 2016 and unlisted since — roughly 10 years. Across the public record there are 4 sales, relatively high churn for a single property. It lags the bulk of the postcode on energy efficiency (less efficient than 77% of similar EPCs). Across 1999–2016, sale prices on this property compounded at 4.3% per year. Today's modelled estimate of £144,000 is 30.9% above the 2016 sale price.