21 Llewelyn Goch, St Fagans, Cardiff, CF5 6HR
About 21 Llewelyn Goch
21 Llewelyn Goch is a detached house in St. Fagans, Cardiff, Cardiff (CF5 6HR). It has a recorded floor area of 185 m² (around 1991 sq ft), construction records dating it to 2003-2006 and council tax band G. The latest certificate (March 2016) shows a D (score 57), a step below the typical UK home. The recommended improvements would lift it to B (score 81), a 2-band jump. The latest certificate is from March 2016, so improvements made since then won't be reflected.
It hasn't traded since September 2003, a hold of 23 years that's notably long for the area. Across 2002–2003, sale prices on this property compounded at 1.3% per year. Today's modelled estimate of £614,000 sits 94.9% above the 2003 sale of £315,000. One planning record on file: an extension approved in 2017. Past consents include an extension, meaningful when judging how the property has evolved. It lags the bulk of the postcode on energy efficiency (less efficient than 78% of similar EPCs).
Energy performance
21 Llewelyn Goch's carbon output runs well above what efficient homes in the postcode produce.
EPC Expired
This certificate is over 10 years old and is no longer valid.Expired 01 Mar 2026
EPC Rating
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Planning history
21 Llewelyn Goch has an approved rear extension on the planning record.
1 application on record at 21 Llewelyn Goch, St Fagans, Cardiff, CF5 6HR
- May 2017ExtensionOutlineOutcome in report
Extension: Rear of property
REAR GROUND FLOOR EXTENSIONS 4000MM OR LESS DEPTH FROM ORIGINAL MAIN HOUSE, PLUS ALTERATIONS TO FRONT
- Documents
- 10 docs on file
- Reference
- 17/00629/DCH
Unlock 21 Llewelyn Goch, St Fagans, Cardiff, CF5 6HR's full planning history
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- Every decision — granted, refused or withdrawn (1 on record)
- All 1 application on this property in full, plus 1 notable nearby
- The 10 documents, officer reports & conditions
- What the pattern means for extending or converting here
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Sales history & valuation
21 Llewelyn Goch changed hands twice within eighteen months — unusual for the area.
£614,000
Modelled from EPC, postcode comparables and a sale-price growth of 1.3% per year over 1 year.
£315,000
Growth on file: 1.3% per year over 1 year.
Sales timeline
25 September 2003Most recent
£315,000
+1.3%over 9 months20 December 2002
£311,000
Median price across the last 5 sales in CF5 6HR: £567,500 (2025–2022).
Nearby sales in CF5 6HR
17 Llewelyn Goch, St Fagans, Cardiff, CF5 6HR
Sold May 2025
£590,00029 Llewelyn Goch, St Fagans, Cardiff, CF5 6HR
Sold Apr 2025
£650,00033 Llewelyn Goch, St Fagans, Cardiff, CF5 6HR
Sold Jan 2025
£425,00031 Llewelyn Goch, St Fagans, Cardiff, CF5 6HR
Sold Apr 2024
£495,00043 Llewelyn Goch, St Fagans, Cardiff, CF5 6HR
Sold Jun 2022
£567,500
Versus other Llewelyn Goch homes
21 Llewelyn Goch is notably below the street on co₂ emissions.
Price per m²
£1,703
Street avg £2,321
Floor Area
185 m²
Street avg 165 m²
Habitable Rooms
7 rooms
Street avg 7 rooms
CO₂ Emissions
8.6 t/year
Street avg 4.8 t/year
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The neighbourhood at a glance
Crime
6/mo
Steady year-on-year across the wider district.
Nearest stop
0.3 km
Rhydlafar — bus stop.
Go deeper on the local area
A Local Area report breaks down crime, transport links, schools and air quality in depth.







