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Get started15 Derwent Street is a three-bedroom mid-terrace house in Llanelli (SA15 3ES). It has a recorded floor area of 99 m² (around 1066 sq ft), construction records dating it to before 1900 and council tax band B. The latest certificate (May 2025) shows a C (score 71). When first surveyed in May 2013 the rating was F, the property has climbed 3 bands since. Between certificates, wall efficiency went from Very Poor to Poor, roof efficiency went from Very Poor to Good and hot-water efficiency went from Poor to Good. The recommended improvements would push it to B (score 85).
Sale prices here have outpaced England HPI: 5.8% per year against 0% for the wider region. Today's modelled estimate of £142,000 is 37.2% above the 2020 sale price. On energy efficiency it sits in the top 10% of properties in this postcode. Last sale on file: £103,500 in September 2020.
15 Derwent Street ranks among the most efficient homes in the postcode for energy use.
The latest sale landed in the post-pandemic price surge — useful context when reading the figure.
£142,000
Modelled from EPC, postcode comparables and a sale-price growth of 5.8% per year over 3 years.
£103,500
Growth on file: 5.8% per year over 3 years.
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Detailed AI analysis
15 Derwent Street outperforms the street on epc rating by a wide margin.
EPC Rating
71 (C)
Street avg 62 (D)
Floor Area
99 m²
Street avg 100 m²
CO₂ Emissions
3.4 t/year
Crime
4/mo
Steady year-on-year across the wider district.
Nearest stop
0.1 km
Lotus House — bus stop.
Changes detected from historical EPC data
Low energy lighting percentage decreased
Heating controls upgraded for better temperature management
Hot water system upgraded
Wall insulation improved
Roof insulation improved
More low energy lighting installed
Are we missing something? Tell us about home improvements to help adjust your valuation.
18 September 2020Most recent
£103,500
+21.8%over 3 years23 March 2017
£85,000
Median price across the last 5 sales in SA15 3ES: £80,000 (2021–2003).
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Street avg 4.6 t/year
Habitable Rooms
4 rooms
Street avg 5 rooms
SA15 3RU