3 Brynmawr Close, St Mellons, Cardiff, CF3 0HJ
About 3 Brynmawr Close
3 Brynmawr Close is a mid-terrace house in St. Mellons, Cardiff, Cardiff (CF3 0HJ). It has a recorded floor area of 89 m² (around 958 sq ft), construction records dating it to 1967-1975 and council tax band C. The latest certificate (February 2014) shows a D (score 68), on the cusp of jumping into the C band. The rating has held steady at D across 2 certificates since June 2013. Between certificates, roof efficiency went from Average to Very Good and lighting went from Poor to Average; while wall efficiency dropped from Average to Poor. The recommended improvements would lift it to B (score 86), a 2-band jump. The latest certificate is from February 2014, so improvements made since then won't be reflected.
On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. Today's modelled estimate of £243,000 is 13% above the 2023 sale price. On a £-per-square-foot basis, the last sale (£224/sq ft) was about 61% above the typical sold price in the postcode. Most recent transfer: January 2023 at £215,000.
Energy performance
3 Brynmawr Close sits at the bottom of the postcode for energy efficiency — meaningful headroom to improve.
EPC Expired
This certificate is over 10 years old and is no longer valid.Expired 07 Feb 2024
EPC Rating
Certificate validity
Expired on 7 February 2024
Property Improvements
Changes detected from historical EPC data
Heating controls upgraded for better temperature management
Loft insulation upgraded to recommended levels
More low energy lighting installed
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Planning history
3 Brynmawr Close 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
Latest sale on 3 Brynmawr Close was the highest on Land Registry record across the postcode.
£243,000
Modelled from EPC, postcode comparables.
£215,000
Recorded with HM Land Registry.
Sales timeline
23 January 2023Most recent
£215,000
Median price across the last 5 sales in CF3 0HJ: £195,000 (2025–2019).
Nearby sales in CF3 0HJ
18 Brynmawr Close, St Mellons, Cardiff, CF3 0HJ
Sold Oct 2025
£195,0001 Brynmawr Close, St Mellons, Cardiff, CF3 0HJ
Sold Jun 2022
£202,0004 Brynmawr Close, St Mellons, Cardiff, CF3 0HJ
Sold Feb 2021
£138,00021 Brynmawr Close, St Mellons, Cardiff, CF3 0HJ
Sold Jul 2019
£130,0002 Brynmawr Close, St Mellons, Cardiff, CF3 0HJ
Sold May 2009
£77,000
Versus other Brynmawr Close homes
Price per m² for 3 Brynmawr Close runs comfortably ahead of the street norm.
Price per m²
£2,416
Street avg £1,881
Floor Area
89 m²
Street avg 82 m²
Habitable Rooms
4 rooms
Street avg 5 rooms
CO₂ Emissions
2.9 t/year
Street avg 2.5 t/year
Similar properties nearby
1 Brynmawr Close, St Mellons
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1 Brython Drive, St Mellons
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1 Aston Place, St Mellons
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1 Bodnant Close, St Mellons
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1 Chervil Close, St Mellons
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1 Abernethy Close, 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
Willowdene Way — bus stop.
Go deeper on the local area
A Local Area report breaks down crime, transport links, schools and air quality in depth.







