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Get started10 Trewen is a mid-terrace house in Groeslon, Caernarfon, Caernarfon (LL54 7SY). It has a recorded floor area of 84 m² (around 904 sq ft), construction records dating it to 1930-1949 and council tax band B. The latest certificate (May 2025) shows an E (score 54), well below the UK norm with real room to improve. Earlier certificates rated it C (July 2009); the latest reading is 2 bands lower. Between certificates, window efficiency went from Average to Good and lighting went from Average to Very Good; while wall efficiency dropped from Good to Poor and hot-water efficiency dropped from Good to Poor. The recommended improvements would lift it to C (score 76), a 2-band jump. Main heating runs on lpg.
On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement.
10 Trewen sits at the bottom of the postcode for energy efficiency — meaningful headroom to improve.
10 Trewen has no Land Registry sales on file, suggesting it has stayed in the same hands since registration began.
£141,000
Modelled from EPC, postcode comparables.
That can mean the property has never traded since the registry began publishing in 1995, was a new build that hasn't been registered yet, or is held in the same hands long-term.
10 Trewen is notably below the street on epc rating.
EPC Rating
54 (E)
Street avg 68 (D)
Floor Area
84 m²
Street avg 83 m²
CO₂ Emissions
2.9 t/year
Street avg 3.2 t/year
Crime
3/mo
Steady year-on-year across the wider district.
Nearest stop
0.2 km
Bryn Neaudd — bus stop.
Changes detected from historical EPC data
Heating controls upgraded for better temperature management
Mechanical ventilation installed
Fuel source changed
Hot water efficiency decreased
Window efficiency improved
More low energy lighting installed
Ventilation system changed
Are we missing something? Tell us about home improvements to help adjust your valuation.
Median price across the last 5 sales in LL54 7SY: £120,000 (2025–2006).
Habitable Rooms
4 rooms
Street avg 5 rooms