Marlborough House, Flat 3, Westgate Street, Cardiff, CF10 1DE
About Marlborough House
Marlborough House is a semi-detached house in Cardiff (CF10 1DE). It has a recorded floor area of 67 m² (around 721 sq ft), construction records dating it to 1930-1949 and council tax band E. The latest certificate (January 2019) shows an E (score 48), well below the UK norm with real room to improve. The recommended improvements would push it to D (score 61). At 67 m² this is the 5th smallest of 15 units on EPC record in Marlborough House, where floor areas span 26–90 m². The building's EPC ratings span G to C across 15 units on file.
It lags the bulk of the postcode on energy efficiency (less efficient than 79% of similar EPCs). Across 2020–2021, sale prices on this property compounded at 42.6% per year. Today's modelled estimate of £198,000 is 11.5% above the 2021 sale price. On a £-per-square-foot basis, the last sale (£246/sq ft) was about 33.4% above the typical sold price in the postcode. Last sale on file: £177,500 in September 2021. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.
Energy performance
EPC Rating
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Planning history
Marlborough House has no planning applications on record.
A planning report still maps activity across the surrounding area and reads this property's extension & conversion potential.
Sales history & valuation
Marlborough House changed hands twice within eighteen months — unusual for the area.
£198,000
Modelled from EPC, postcode comparables and a sale-price growth of 42.6% per year over 1 year.
£177,500
Growth on file: 42.6% per year over 1 year.
Sales timeline
16 September 2021Most recent
£177,500
+47.9%over 1 year9 August 2020
£120,000
Median price across the last 5 sales in CF10 1DE: £200,000 (2024–2020).
Nearby sales in CF10 1DE
Marlborough House, Flat 4, Westgate Street, Cardiff, CF10 1DE
Sold Oct 2024
£200,000Marlborough House, Flat 7, Westgate Street, Cardiff, CF10 1DE
Sold Oct 2024
£85,724Marlborough House, Flat 8, Westgate Street, Cardiff, CF10 1DE
Sold Sept 2022
£200,000Marlborough House, Flat 14, Westgate Street, Cardiff, CF10 1DE
Sold Sept 2020
£173,500Marlborough House, Flat 6, Westgate Street, Cardiff, CF10 1DE
Sold Feb 2020
£137,000
Versus other Westgate Street homes
Marlborough House outperforms the street on price per m² by a wide margin.
Price per m²
£2,649
Street avg £2,046
Floor Area
67 m²
Street avg 67 m²
Habitable Rooms
3 rooms
Street avg 3 rooms
CO₂ Emissions
4.6 t/year
Street avg 3.2 t/year
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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
0.1 km
Westgate Street KP — bus stop.
Go deeper on the local area
A Local Area report breaks down crime, transport links, schools and air quality in depth.







