Tewin Water House, Apartment 6, Tewin Water, Welwyn, AL6 0AA

Tewin Water House is a three-bedroom detached house in Welwyn (AL6 0AA). It has a recorded floor area of 197 m² (around 2120 sq ft), construction records dating it to before 1900 and council tax band G. At 197 m² this is the 3rd smallest of 5 units on EPC record in Tewin Water House, where floor areas span 154–588 m². The building's EPC ratings span E to C, with this unit at the top. Other recorded features include a balcony, notable views and attached land beyond the plot. Period features are noted in the property record. The latest certificate (October 2008) shows a C (score 70). The latest certificate is from October 2008, so improvements made since then won't be reflected.

Untraded for 16 years, with the last transfer in December 2009. That sale fell during the post-crash dip, which often skews comparisons against later neighbouring sales. Across 2002–2009, sale prices on this property compounded at 5% per year. Today's modelled estimate of £925,000 sits 56.8% above the 2009 sale of £590,000. 3 planning records sit against the property, 2 approved, 0 refused. Past consents include new windows, meaningful when judging how the property has evolved. At 197 m² it's 27.1% smaller than the typical home in the postcode (270 m² median across 4 EPCs). Its energy rating outperforms most of the postcode (better than 75% of similar EPCs).