10 Caroline Square, King William Street, Portsmouth, PO1 3JG
About 10 Caroline Square
10 Caroline Square is a detached house in Portsmouth (PO1 3JG). It has a recorded floor area of 67 m² (around 721 sq ft), construction records dating it to 2012-2021 and council tax band B. At 67 m² this is the 36th smallest of 43 units on EPC record in the building, where floor areas span 55–68 m². The building's EPC ratings span C to B, with this unit at the bottom. The latest certificate (November 2025) shows a C (score 79), near the top of the C band. Earlier certificates rated it B (November 2013); the latest reading is one band lower. Between certificates, wall efficiency dropped from Very Good to Good and window efficiency dropped from Very Good to Good. This certificate was lodged in the last six months, so the rating reflects current condition.
At 67 m² it's 21.8% larger than the typical home in the postcode (55 m² median across 42 EPCs).
Everything you need to know about 10 Caroline Square
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Energy performance
10 Caroline Square's carbon output is low for the local stock.
EPC Rating
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Level 2 HomeBuyer Report
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Planning history
10 Caroline Square has no planning applications on record.
But the area is active
3 notable applications nearby — larger schemes and conversions that could reshape the street. The report maps them all.
Sales history & valuation
10 Caroline Square has no Land Registry sales on file, suggesting it has stayed in the same hands since registration began.
£194,000
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 King William Street homes
10 Caroline Square outperforms the street on floor area by a wide margin.
EPC Rating
79 (C)
Street avg 80 (C)
Floor Area
67 m²
Street avg 58 m²
CO₂ Emissions
1.4 t/year
Street avg 1.2 t/year
Habitable Rooms
2 rooms
Street avg 2 rooms
Everything you need to know about 10 Caroline Square
The true value, the hidden risks and the full sale history, in one report.
Pick your report · every report is £14.99
One time fee only - money back guarantee
The data behind every report
Similar properties nearby
1 Caroline Square, King William Street
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The neighbourhood at a glance
Rail-style transport is unusually close for this postcode.
Crime
9/mo
Steady year-on-year across the wider district.
Nearest stop
0.1 km
Curzon Howe Road — bus stop.
Closest school
0.2 km
St George's Beneficial Church of England (Voluntary Controlled) Primary School. 35 schools nearby.
Go deeper on the local area
A Local Area report breaks down crime, transport links, schools and air quality in depth.
Road noise across the postcode
Daytime· 07:00 – 23:00
48.4dB
Night-time· 23:00 – 07:00
40.8dB