3 Heol Williams, Old St Mellons, Cardiff, CF3 6AQ
About 3 Heol Williams
3 Heol Williams is a three-bedroom detached house in Old St. Mellons, Cardiff, Cardiff (CF3 6AQ). It has a recorded floor area of 90 m² (around 969 sq ft). The latest certificate (May 2019) returns a B (score 82), comfortably above the UK average. The recommended improvements would push it to A (score 93).
At 90 m² it's 26.8% larger than the typical home in the postcode (71 m² median across 57 EPCs). Today's modelled estimate of £367,000 is 26.6% above the 2019 sale price. Last sale on file: £289,995 in May 2019.
What this property has
Inside
- Bedrooms3
- Bathrooms2
- Open-plan layoutYes
- Dining roomYes
- Utility roomYes
- EnsuiteYes
Outside
- GarageDetached
Energy performance
3 Heol Williams's carbon output is low for the local stock.
EPC Rating
Certificate validity
Valid until 19 May 2029
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Planning history
3 Heol Williams 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
3 Heol Williams valuation sits well clear of the typical sold price in this postcode.
£367,000
Modelled from EPC, postcode comparables.
£289,995
Recorded with HM Land Registry.
Sales timeline
30 May 2019Most recent
£289,995
Median price across the last 5 sales in CF3 6AQ: £255,000 (2026–2025).
Nearby sales in CF3 6AQ
23 Heol Williams, Old St Mellons, Cardiff, CF3 6AQ
Sold Mar 2026
£280,00052 Heol Williams, Old St Mellons, Cardiff, CF3 6AQ
Sold Jan 2026
£250,00021 Heol Williams, Old St Mellons, Cardiff, CF3 6AQ
Sold Nov 2025
£255,00013 Heol Williams, Old St Mellons, Cardiff, CF3 6AQ
Sold Jun 2025
£217,0008 Heol Williams, Old St Mellons, Cardiff, CF3 6AQ
Sold Mar 2025
£280,000
Versus other Heol Williams homes
Years Held for 3 Heol Williams runs comfortably ahead of the street norm.
Price per m²
£3,222
Street avg £3,154
Floor Area
90 m²
Street avg 80 m²
CO₂ Emissions
1.5 t/year
Street avg 1.3 t/year
Years Held
7 years
Street avg 5 years
Similar properties nearby
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1 Clos Thomas, Old St Mellons
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1 Church Road, Old St Mellons
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1 Rogers Avenue, Old St Mellons
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1 Heol Swatridge, Old St Mellons
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The neighbourhood at a glance
Crime
242/mo
Falling year-on-year across the wider district.
Nearest stop
0.1 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.







