20 Duncan Close, St Mellons, Cardiff, CF3 1NP
About 20 Duncan Close
20 Duncan Close is a two-bedroom semi-detached house in St. Mellons, Cardiff, Cardiff (CF3 1NP). It has a recorded floor area of 56 m² (around 603 sq ft), construction records dating it to 1996-2002 and council tax band C. The latest certificate (January 2024) shows a C (score 74). When first surveyed in March 2013 the rating was D, the property has climbed 1 band since. Between certificates, roof efficiency went from Very Poor to Good, hot-water efficiency went from Average to Good and lighting went from Poor to Very Good. The recommended improvements would push it to B (score 89).
Untraded for 21 years, with the last transfer in April 2005. Across 2000–2005, sale prices on this property compounded at 19.9% per year. Today's modelled estimate of £191,000 sits 70.5% above the 2005 sale of £112,000. At 56 m² it's 17.6% smaller than the typical home in the postcode (68 m² median across 17 EPCs).
What this property has
Inside
- Bedrooms2
Outside
- Private gardenRear
- ParkingAllocated
Building
- RefurbishedYes
Energy performance
EPC Rating
Property Improvements
Changes detected from historical EPC data
Heating controls changed
Hot water efficiency improved
Loft insulation upgraded to recommended levels
Floor insulation added or improved
More low energy lighting installed
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Planning history
20 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
Sale price has at least doubled since 2000.
£191,000
Modelled from EPC, postcode comparables and a sale-price growth of 19.9% per year over 5 years.
£112,000
Growth on file: 19.9% per year over 5 years.
Sales timeline
19 April 2005Most recent
£112,000
+148.9%over 5 years13 April 2000
£45,000
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
On price per m², 20 Duncan Close runs well behind the street norm.
Price per m²
£2,000
Street avg £2,876
Floor Area
56 m²
Street avg 66 m²
Habitable Rooms
4 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.







