12 Duncan Close, St Mellons, Cardiff, CF3 1NP
About 12 Duncan Close
12 Duncan Close is a two-bedroom semi-detached house in St. Mellons, Cardiff, Cardiff (CF3 1NP). It has a recorded floor area of 57 m² (around 614 sq ft), construction records dating it to 1983-1990 and council tax band C. The latest certificate (May 2024) shows a C (score 74). When first surveyed in April 2014 the rating was D, the property has climbed 1 band since. Between certificates, roof efficiency went from Poor to Very Good, window efficiency went from Average to Good and hot-water efficiency went from Average to Good. The recommended improvements would push it to B (score 89). The home occupies a cul-de-sac position.
Across 1999–2014, sale prices on this property compounded at 7.8% per year. Today's modelled estimate of £204,000 sits 56.9% above the 2014 sale of £130,000. On the market in September 2014 and unlisted since — roughly 12 years. At 57 m² it's 16.2% smaller than the typical home in the postcode (68 m² median across 17 EPCs).
What this property has
Inside
- Bedrooms2
- Bathrooms1
Outside
- Private gardenRear
- DrivewayYes
- Cul-de-sacYes
Building
- RefurbishedYes
Energy performance
EPC Rating
Property Improvements
Changes detected from historical EPC data
Roof insulation improved
Low energy lighting percentage decreased
Hot water system upgraded
More low energy lighting installed
Window efficiency improved
Loft insulation upgraded to recommended levels
Floor insulation added or improved
Get a survey for this property
Level 2 HomeBuyer Report
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Planning history
12 Duncan Close has no planning applications on record.
A planning report still maps activity across the surrounding area and reads this property's extension & conversion potential.
Sales history & valuation
12 Duncan Close has more than tripled in price since its earliest registered sale in 1999.
£204,000
Modelled from EPC, postcode comparables and a sale-price growth of 7.8% per year over 15 years.
£130,000
Growth on file: 7.8% per year over 15 years.
Sales timeline
14 September 2014Most recent
£130,000
+205.9%over 14 years7 October 1999
£42,500
Median price across the last 5 sales in CF3 1NP: £245,000 (2025–2024).
Nearby sales in CF3 1NP
1 Duncan Close, St Mellons, Cardiff, CF3 1NP
Sold Oct 2025
£240,0002 Duncan Close, St Mellons, Cardiff, CF3 1NP
Sold Aug 2025
£250,00023 Duncan Close, St Mellons, Cardiff, CF3 1NP
Sold Aug 2025
£245,00010 Duncan Close, St Mellons, Cardiff, CF3 1NP
Sold Jul 2025
£265,00019 Duncan Close, St Mellons, Cardiff, CF3 1NP
Sold Sept 2024
£212,500
Versus other Duncan Close homes
CO₂ Emissions for 12 Duncan Close runs comfortably ahead of the street norm.
Price per m²
£2,281
Street avg £2,859
Floor Area
57 m²
Street avg 66 m²
Habitable Rooms
3 rooms
Street avg 4 rooms
CO₂ Emissions
1.7 t/year
Street avg 2.2 t/year
Similar properties nearby
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1 Duncan Close, 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
0.1 km
Ty Coch Court — bus stop.
Go deeper on the local area
A Local Area report breaks down crime, transport links, schools and air quality in depth.







