Llanberis House, Began Road, Old St Mellons, Cardiff, CF3 6XJ
About Llanberis House
Llanberis House is a detached house in Old St. Mellons, Cardiff, Cardiff (CF3 6XJ). It has a recorded floor area of 206 m² (around 2217 sq ft) and construction records dating it to 1983-1990. The latest certificate (July 2022) shows a D (score 65), on the cusp of jumping into the C band. The recommended improvements would lift it to B (score 82), a 2-band jump.
Untraded for 25 years, with the last transfer in July 2001. At 206 m² the property is well over the postcode median (107 m² across 8 EPCs), placing it in the larger end of the local stock. It lags the bulk of the postcode on energy efficiency (less efficient than 75% of similar EPCs). Today's modelled estimate of £765,000 sits 155% above the 2001 sale of £300,000. On a £-per-square-foot basis, the last sale (£135/sq ft) was about 41.1% below the postcode norm.
Energy performance
Llanberis House's carbon output runs well above what efficient homes in the postcode produce.
EPC Rating
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Planning history
Llanberis House has no planning applications on record.
But the area is active
1 notable application nearby — larger schemes and conversions that could reshape the street. The report maps them all.
Sales history & valuation
Llanberis House valuation sits well clear of the typical sold price in this postcode.
£765,000
Modelled from EPC, postcode comparables.
£300,000
Recorded with HM Land Registry.
Sales timeline
9 July 2001Most recent
£300,000
Median price across the last 5 sales in CF3 6XJ: £410,000 (2024–2022).
Nearby sales in CF3 6XJ
Little Orchard, Began Road, Old St Mellons, Cardiff, CF3 6XJ
Sold Jul 2024
£395,000The Cottage, Began Road, Old St Mellons, Cardiff, CF3 6XJ
Sold May 2024
£412,500The Grainhouse, Began Road, Old St Mellons, Cardiff, CF3 6XJ
Sold Jun 2023
£805,000Long Mynd, Began Road, Old St Mellons, Cardiff, CF3 6XJ
Sold Mar 2023
£410,000Hascosay, Began Road, Old St Mellons, Cardiff, CF3 6XJ
Sold Dec 2022
£350,000
Versus other Began Road homes
On habitable rooms, Llanberis House stands well clear of the street.
Price per m²
£1,456
Street avg £2,927
Floor Area
206 m²
Street avg 141 m²
Habitable Rooms
8 rooms
Street avg 6 rooms
CO₂ Emissions
7.5 t/year
Street avg 4.8 t/year
Similar properties nearby
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1 Tai Derwen, Cefn Mably
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1 Heol Bennett, Old St Mellons
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1 High Trees Court, Druidstone Road, Old St Mellons
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1 Rhodfa Lewis, Old St Mellons
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1 George Crescent, Old St Mellons
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The neighbourhood at a glance
Reported crime in the wider district is trending notably upward year-on-year.
Crime
3/mo
Rising year-on-year across the wider district.
Nearest stop
0.3 km
Tyrwinch Road — bus stop.
Go deeper on the local area
A Local Area report breaks down crime, transport links, schools and air quality in depth.







