15 Cwm Gwynlais, Tongwynlais, Cardiff, CF15 7HU
About 15 Cwm Gwynlais
15 Cwm Gwynlais is a detached house in Tongwynlais, Cardiff, Cardiff (CF15 7HU). It has a recorded floor area of 112 m² (around 1206 sq ft), construction records dating it to 1976-1982 and council tax band E. The latest certificate (October 2013) shows a D (score 55), a step below the typical UK home. The rating has held steady at D across 2 certificates since May 2013. Between certificates, wall efficiency dropped from Good to Average and hot-water 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 October 2013, so improvements made since then won't be reflected.
One planning record on file: an extension approved in 2017. Past consents include an extension, meaningful when judging how the property has evolved. Across 2000–2013, sale prices on this property compounded at 6.4% per year. Today's modelled estimate of £399,000 is 47.8% above the 2013 sale price. On a £-per-square-foot basis, the last sale (£224/sq ft) was about 34.4% above the typical sold price in the postcode. On the market in October 2013 and unlisted since — roughly 13 years.
Energy performance
Recommended upgrades on file would lift this property by multiple EPC bands.
EPC Expired
This certificate is over 10 years old and is no longer valid.Expired 18 Oct 2023
EPC Rating
Property Improvements
Changes detected from historical EPC data
Hot water system changed
Roof insulation improved
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Planning history
Council records include a two-storey side extension at 15 Cwm Gwynlais.
1 application on record at 15 Cwm Gwynlais, Tongwynlais, Cardiff, CF15 7HU
- Jun 2017ExtensionFullOutcome in report
Extension: Two storey · Side of property
2 STOREY SIDE EXTENSION (ABOVE EXISTING SINGLE STOREY)
- Documents
- 6 docs on file
- Reference
- 17/00923/DCH
Unlock 15 Cwm Gwynlais, Tongwynlais, Cardiff, CF15 7HU's full planning history
You're seeing the shape of it. The report has the substance.
- Every decision — granted, refused or withdrawn (1 on record)
- All 1 application on this property in full, plus 1 notable nearby
- The 6 documents, officer reports & conditions
- What the pattern means for extending or converting here
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Sales history & valuation
15 Cwm Gwynlais has more than doubled in price since the earliest registered sale in 2000.
£399,000
Modelled from EPC, postcode comparables and a sale-price growth of 6.4% per year over 14 years.
£270,000
Growth on file: 6.4% per year over 14 years.
Sales timeline
3 October 2013Most recent
£270,000
+134.8%over 13 years14 January 2000
£115,000
Median price across the last 5 sales in CF15 7HU: £300,000 (2022–2017).
Nearby sales in CF15 7HU
24 Cwm Gwynlais, Tongwynlais, Cardiff, CF15 7HU
Sold Dec 2022
£302,00017 Cwm Gwynlais, Tongwynlais, Cardiff, CF15 7HU
Sold Jun 2021
£365,00011 Cwm Gwynlais, Tongwynlais, Cardiff, CF15 7HU
Sold Aug 2019
£225,0006 Cwm Gwynlais, Tongwynlais, Cardiff, CF15 7HU
Sold Jun 2019
£128,30427 Cwm Gwynlais, Tongwynlais, Cardiff, CF15 7HU
Sold Feb 2017
£300,000
Versus other Cwm Gwynlais homes
On epc rating, 15 Cwm Gwynlais runs well behind the street norm.
Price per m²
£2,411
Street avg £2,051
Floor Area
112 m²
Street avg 103 m²
Habitable Rooms
6 rooms
Street avg 6 rooms
CO₂ Emissions
5.6 t/year
Street avg 4.1 t/year
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The neighbourhood at a glance
Crime
2/mo
Steady year-on-year across the wider district.
Nearest stop
0.1 km
Pantgwynlais — bus stop.
Go deeper on the local area
A Local Area report breaks down crime, transport links, schools and air quality in depth.







