Capel House, St Y Nyll Lane, Capel Llanilltern, Cardiff, CF5 6HF
About Capel House
Capel House is a detached house in Capel Llanilltern, Cardiff, Cardiff (CF5 6HF). It has a recorded floor area of 242 m² (around 2605 sq ft) and construction records dating it to before 1900. The latest certificate (July 2015) shows a G (score 5), near the bottom of the EPC scale. Earlier certificates rated it F (May 2014); the latest reading is one band lower. Between certificates, roof efficiency dropped from Good to Very Poor and hot-water efficiency dropped from Average to Very Poor. The recommended improvements would lift it to D (score 61), a 3-band jump. Main heating runs on lpg. The latest certificate is from July 2015, so improvements made since then won't be reflected.
At 242 m² the property is well over the postcode median (176 m² across 5 EPCs), placing it in the larger end of the local stock. On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. 3 planning records sit against the property, 2 approved, 1 refused. Past consents include an extension and a porch, meaningful when judging how the property has evolved.
Everything you need to know about Capel House
The true value, the hidden risks and the full sale history, in one report.
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Energy performance
Capel House 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This certificate is over 10 years old and is no longer valid.Expired 12 Jul 2025
EPC Rating
Property Improvements
Changes detected from historical EPC data
Hot water efficiency decreased
Windows upgraded, improving insulation
Low energy lighting percentage decreased
Get a survey for this property
Level 3 Building Survey
Because the property was built before 1919, has been extended more than once, and has no mains gas supply, we believe a Level 3 building survey should be considered.
From £1,155 · Includes VAT
Planning history
A a side and rear extension application was refused at Capel House in 2022.
3 applications on record at Capel House, St Y Nyll Lane, Capel Llanilltern, Cardiff, CF5 6HF
- Feb 2016PorchFullOutcome in report
DEMOLISH OUTBUILDING WITH MINOR ALTERATIONS CONSTRUCT NEW PORCH, DOUBLE GARAGE AND DRIVEWAY WITH HIGHWAYS CROSSOVER
Extension- Documents
- 6 docs on file
- Reference
- 15/03111/DCH
- More recent applications — locked
- ExtensionFeb 2022Decision
- ExtensionMay 2017Decision
Unlock Capel House, St Y Nyll Lane, Capel Llanilltern, Cardiff, CF5 6HF's full planning history
You're seeing the shape of it. The report has the substance.
- Every decision — granted, refused or withdrawn (3 on record)
- All 3 applications on this property in full, plus 1 notable nearby
- The 26 documents, officer reports & conditions
- What the pattern means for extending or converting here
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Sales history & valuation
Capel House has no Land Registry sales on file, suggesting it has stayed in the same hands since registration began.
£605,000
Modelled from EPC, postcode comparables.
No sales recorded with HM Land Registry
That can mean the property has never traded since the registry began publishing in 1995, was a new build that hasn't been registered yet, or is held in the same hands long-term.
Median price across the last 5 sales in CF5 6HF: £360,000 (2025–1999).
Versus other St Y Nyll Lane homes
EPC Rating for Capel House lags the street by a wide margin.
EPC Rating
5 (G)
Street avg 43 (E)
Floor Area
242 m²
Street avg 162 m²
CO₂ Emissions
19.0 t/year
Street avg 7.7 t/year
Habitable Rooms
8 rooms
Street avg 6 rooms
Everything you need to know about Capel House
The true value, the hidden risks and the full sale history, in one report.
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The neighbourhood at a glance
Crime
6/mo
Steady year-on-year across the wider district.
Nearest stop
0.7 km
Broadlands — bus stop.
Go deeper on the local area
A Local Area report breaks down crime, transport links, schools and air quality in depth.






