23 Canopus Close, St Mellons, Cardiff, CF3 1NR
About 23 Canopus Close
23 Canopus Close is a semi-detached house in St. Mellons, Cardiff, Cardiff (CF3 1NR). It has a recorded floor area of 69 m² (around 743 sq ft), construction records dating it to 1976-1982 and council tax band D. The latest certificate (September 2023) shows a C (score 72). The rating has held steady at C across 2 certificates since September 2009. Between certificates, lighting went from Good to Very Good; while wall efficiency dropped from Good to Average and hot-water efficiency dropped from Very Good to Good. The recommended improvements would push it to B (score 90).
Across 2004–2014, sale prices on this property compounded at 1.6% per year. Today's modelled estimate of £230,000 sits 64.3% above the 2014 sale of £140,000. On a £-per-square-foot basis, the last sale (£188/sq ft) was about 21.7% above the typical sold price in the postcode. Last sold in March 2014, so it's been off the market for around 12 years.
Energy performance
EPC Rating
Certificate validity
Valid until 5 September 2033
Property Improvements
Changes detected from historical EPC data
Heating controls upgraded for better temperature management
Hot water efficiency decreased
More low energy lighting installed
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Planning history
23 Canopus 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
23 Canopus Close changed hands twice within eighteen months — unusual for the area.
£230,000
Modelled from EPC, postcode comparables and a sale-price growth of 1.6% per year over 10 years.
£140,000
Growth on file: 1.6% per year over 10 years.
Sales timeline
7 March 2014Most recent
£140,000
2 November 2012
£140,000
+16.7%over 8 years5 May 2004
£120,000
Median price across the last 5 sales in CF3 1NR: £233,000 (2026–2023).
Nearby sales in CF3 1NR
2 Canopus Close, St Mellons, Cardiff, CF3 1NR
Sold Apr 2026
£289,0001 Canopus Close, St Mellons, Cardiff, CF3 1NR
Sold Dec 2025
£180,00026 Canopus Close, St Mellons, Cardiff, CF3 1NR
Sold Nov 2025
£220,00013 Canopus Close, St Mellons, Cardiff, CF3 1NR
Sold Apr 2024
£290,0008 Canopus Close, St Mellons, Cardiff, CF3 1NR
Sold Mar 2023
£233,000
Versus other Canopus Close homes
Price per m²
£2,029
Street avg £2,443
Floor Area
69 m²
Street avg 71 m²
Habitable Rooms
5 rooms
Street avg 5 rooms
CO₂ Emissions
2.2 t/year
Street avg 2.3 t/year
Similar properties nearby
The neighbourhood at a glance
Crime
242/mo
Falling year-on-year across the wider district.
Nearest stop
0.2 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.







