12b Nelson House, Loudoun Square, Cardiff, CF10 5JG
About 12b Nelson House
12b Nelson House is a mid-terrace house in Cardiff (CF10 5JG). It has a recorded floor area of 145 m² (around 1561 sq ft) and construction records dating it to 1950-1966. At 145 m² this is the largest unit on EPC record across the building (56–145 m²). The building's EPC ratings span D to C, with this unit at the top. The latest certificate (June 2025) shows a C (score 78), near the top of the C band. The rating has held steady at C across 2 certificates since February 2025. Between certificates, wall efficiency went from Very Poor to Poor and window efficiency went from Average to Good. The recommended improvements would push it to B (score 83).
At 145 m² the property is well over the postcode median (64 m² across 29 EPCs), placing it in the larger end of the local stock.
Everything you need to know about 12b Nelson House
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The data behind every report
Energy performance
EPC Rating
Certificate validity
Valid until 12 June 2035
Property Improvements
Changes detected from historical EPC data
Window efficiency improved
Wall insulation improved
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Planning history
12b Nelson House has no planning applications on record.
But the area is active
5 notable applications nearby — larger schemes and conversions that could reshape the street. The report maps them all.
Sales history & valuation
12b Nelson House has no Land Registry sales on file, suggesting it has stayed in the same hands since registration began.
£240,000
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.
Versus other Loudoun Square homes
On floor area, 12b Nelson House stands well clear of the street.
EPC Rating
78 (C)
Street avg 72 (C)
Floor Area
145 m²
Street avg 72 m²
CO₂ Emissions
3.0 t/year
Street avg 2.2 t/year
Habitable Rooms
4 rooms
Street avg 3 rooms
Everything you need to know about 12b Nelson House
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
The data behind every report
Similar properties nearby
The neighbourhood at a glance
Rail-style transport is unusually close for this postcode.
Crime
485/mo
Steady year-on-year across the wider district.
Nearest stop
0.1 km
South Loudon Place — bus stop.
Go deeper on the local area
A Local Area report breaks down crime, transport links, schools and air quality in depth.