4 Blackweir Cottages, Cardiff Castle Grounds, Blackweir, Cardiff, CF10 3EA
About 4 Blackweir Cottages
4 Blackweir Cottages is an end-of-terrace house in Blackweir, Cardiff, Cardiff (CF10 3EA). It has a recorded floor area of 197 m² (around 2120 sq ft), construction records dating it to before 1900 and council tax band G. The latest certificate (November 2025) shows a C (score 75), near the top of the C band. When first surveyed in March 2014 the rating was D, the property has climbed 1 band since. Between certificates, wall efficiency went from Very Poor to Poor and window efficiency went from Poor to Average; while lighting dropped from Very Good to Poor. The recommended improvements would push it to B (score 90).
At 197 m² the property is well over the postcode median (77 m² across 3 EPCs), placing it in the larger end of the local stock.
Everything you need to know about 4 Blackweir Cottages
The true value, the hidden risks and the full sale history, in one report.
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Energy performance
4 Blackweir Cottages's carbon output runs well above what efficient homes in the postcode produce.
EPC Rating
Property Improvements
Changes detected from historical EPC data
Windows upgraded, improving insulation
Wall insulation improved
Solar PV panels (40 kWp) installed
Get a survey for this property
Level 3 Building Survey
Because the property was built before 1919, we believe a Level 3 building survey should be considered.
From £1,020 · Includes VAT
Planning history
4 Blackweir Cottages has no planning applications on record.
But the area is active
6 notable applications nearby — larger schemes and conversions that could reshape the street. The report maps them all.
Sales history & valuation
4 Blackweir Cottages has no Land Registry sales on file, suggesting it has stayed in the same hands since registration began.
£414,000
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 CF10 3EA: £196,000 (2019–1999).
Nearby sales in CF10 3EA
Versus other Cardiff Castle Grounds homes
On epc rating, 4 Blackweir Cottages stands well clear of the street.
EPC Rating
75 (C)
Street avg 46 (E)
Floor Area
197 m²
Street avg 82 m²
CO₂ Emissions
6.9 t/year
Street avg 3.4 t/year
Habitable Rooms
7 rooms
Street avg 5 rooms
Everything you need to know about 4 Blackweir Cottages
The true value, the hidden risks and the full sale history, in one report.
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One time fee only - money back guarantee
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Similar properties nearby
The neighbourhood at a glance
Reported crime in the wider district is trending notably upward year-on-year.
Crime
10/mo
Rising year-on-year across the wider district.
Nearest stop
0.2 km
Colum Road — bus stop.
Go deeper on the local area
A Local Area report breaks down crime, transport links, schools and air quality in depth.