17 Caroline Square, King William Street, Portsmouth, PO1 3JG
About 17 Caroline Square
17 Caroline Square is a detached house in Portsmouth (PO1 3JG). It has a recorded floor area of 68 m² (around 732 sq ft), construction records dating it to 2012-2021 and council tax band B. The latest certificate (July 2025) returns a B (score 82), comfortably above the UK average. The rating has held steady at B across 2 certificates since November 2013. Between certificates, wall efficiency dropped from Very Good to Good and window efficiency dropped from Very Good to Average. At 68 m² this is the 42nd 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 top.
At 68 m² it's 23.6% larger than the typical home in the postcode (55 m² median across 42 EPCs).
Everything you need to know about 17 Caroline Square
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Energy performance
17 Caroline Square's carbon output is low for the local stock.
EPC Rating
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Planning history
17 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
17 Caroline Square has no Land Registry sales on file, suggesting it has stayed in the same hands since registration began.
£206,000
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
On floor area, 17 Caroline Square stands well clear of the street.
EPC Rating
82 (B)
Street avg 80 (C)
Floor Area
68 m²
Street avg 58 m²
CO₂ Emissions
1.2 t/year
Street avg 1.2 t/year
Habitable Rooms
3 rooms
Street avg 2 rooms
Everything you need to know about 17 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
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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