15 Clos Thomas, Old St Mellons, Cardiff, CF3 6YR
About 15 Clos Thomas
15 Clos Thomas is a detached house in Old St. Mellons, Cardiff, Cardiff (CF3 6YR). It has a recorded floor area of 102 m² (around 1098 sq ft). The latest certificate (November 2020) returns a B (score 83), comfortably above the UK average. The recommended improvements would push it to A (score 93).
At 102 m² the property is well over the postcode median (78 m² across 44 EPCs), placing it in the larger end of the local stock. Today's modelled estimate of £369,000 is 23% above the 2020 sale price. Sold December 2020 for £299,995.
Energy performance
EPC Rating
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Planning history
15 Clos Thomas 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
The latest sale landed in the post-pandemic price surge — useful context when reading the figure.
£369,000
Modelled from EPC, postcode comparables.
£299,995
Recorded with HM Land Registry.
Sales timeline
11 December 2020Most recent
£299,995
Median price across the last 5 sales in CF3 6YR: £330,000 (2025–2025).
Nearby sales in CF3 6YR
1 Clos Thomas, Old St Mellons, Cardiff, CF3 6YR
Sold Aug 2025
£340,00014 Clos Thomas, Old St Mellons, Cardiff, CF3 6YR
Sold Apr 2025
£330,00031 Clos Thomas, Old St Mellons, Cardiff, CF3 6YR
Sold Feb 2025
£348,00022 Clos Thomas, Old St Mellons, Cardiff, CF3 6YR
Sold Jan 2025
£243,00051 Clos Thomas, Old St Mellons, Cardiff, CF3 6YR
Sold Jan 2025
£285,000
Versus other Clos Thomas homes
15 Clos Thomas is notably below the street on co₂ emissions.
Price per m²
£2,941
Street avg £3,285
Floor Area
102 m²
Street avg 87 m²
CO₂ Emissions
1.7 t/year
Street avg 1.4 t/year
Years Held
5 years
Street avg 5 years
Similar properties nearby
1 Rees Drive, Old St Mellons
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1 Rhodfa Leonard, Old St Mellons
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1 Heol Williams, Old St Mellons
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1 Began Road, Old St Mellons
CF3 6XJ
1 Cefn Mably Park, Michaelston Y Fedw
CF3 6AA
1 Stryd Boyd, Old St Mellons
CF3 6YS
1 Rogers Avenue, Old St Mellons
CF3 6AL
1 Rhodfa Hughes, Old St Mellons
CF3 6YY
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
0.2 km
Rogers Avenue — bus stop.
Go deeper on the local area
A Local Area report breaks down crime, transport links, schools and air quality in depth.







