Flat 3, 1 Marlborough Road, Cardiff, CF23 5BT
About Flat 3
Flat 3 is a one-bedroom end-of-terrace house in Cardiff (CF23 5BT). It has a recorded floor area of 62 m² (around 667 sq ft), construction records dating it to 1900-1929 and council tax band B. At 62 m² this is the 8th smallest of 13 units on EPC record in the building, where floor areas span 25–224 m². The building's EPC ratings span E to C, with this unit at the top. The latest certificate (July 2026) shows a C (score 69), just inside the C band. When first surveyed in March 2010 the rating was E, the property has climbed 2 bands since. Between certificates, hot-water efficiency went from Very Poor to Good, lighting went from Poor to Good and main heating went from Poor to Good; while window efficiency dropped from Average to Poor. This certificate was lodged in the last six months, so the rating reflects current condition.
At 62 m² the property is well over the postcode median (36 m² across 51 EPCs), placing it in the larger end of the local stock.
What this property has
Inside
- Bedrooms1
Everything you need to know about Flat 3
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Energy performance
The EPC has just been inspected, so the rating reflects current condition.
EPC Rating
Certificate validity
Valid until 3 July 2036
Property Improvements
Changes detected from historical EPC data
Replaced storage heaters with gas boiler
Connected to mains gas supply
Heating controls upgraded for better temperature management
Hot water system upgraded
More low energy lighting installed
Heating system changed
Changed to a more efficient fuel source
Heating controls changed
Hot water system changed
Window efficiency improved
Low energy lighting percentage decreased
Replaced storage heaters with gas boiler
Connected to mains gas supply
Heating controls upgraded for better temperature management
Hot water system upgraded
More low energy lighting 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 £820 · Includes VAT
Planning history
Flat 3 has no planning applications on record.
But the area is active
1 notable application nearby — larger schemes and conversions that could reshape the street. The report maps them all.
Sales history & valuation
Flat 3 has no Land Registry sales on file, suggesting it has stayed in the same hands since registration began.
£154,000
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 CF23 5BT: £485,000 (2024–2017).
Nearby sales in CF23 5BT
Versus other Marlborough Road homes
Floor Area for Flat 3 runs comfortably ahead of the street norm.
EPC Rating
69 (C)
Street avg 66 (D)
Floor Area
62 m²
Street avg 44 m²
CO₂ Emissions
2.2 t/year
Street avg 2.3 t/year
Habitable Rooms
2 rooms
Street avg 2 rooms
Everything you need to know about Flat 3
The true value, the hidden risks and the full sale history, in one report.
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The neighbourhood at a glance
Crime
169/mo
Falling year-on-year across the wider district.
Nearest stop
0.1 km
Marlborough Road — bus stop.
Go deeper on the local area
A Local Area report breaks down crime, transport links, schools and air quality in depth.