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23 Caroline Square, King William Street, Portsmouth, PO1 3JG

EPC B
Property type
Detached
Floor 01
Habitable rooms
2
From EPC
Floor area
55 m²
592 sq ft
Energy rating
B
Score 82
Council tax
Band B
Tenure
Social Rental
Overview

About 23 Caroline Square

A plain-English summary derived from public records, EPC certificates, sold prices and local data.

23 Caroline Square is a detached house in Portsmouth (PO1 3JG). It has a recorded floor area of 55 m² (around 592 sq ft), construction records dating it to 2012-2021 and council tax band B. At 55 m² this is the smallest unit on EPC record across the building (55–68 m²). The building's EPC ratings span C to B, with this unit at the top. 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.

Before you decide

Everything you need to know about 23 Caroline Square

The true value, the hidden risks and the full sale history, in one report.

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Preview of the full property report

The data behind every report

  • HM Land Registry, source of sold price history
  • Department for Education, source of schools data
  • Police.uk, source of crime statistics
  • Department for Transport, source of stations and transport links
  • Environment Agency, source of flood risk data
  • Department for Environment, Food & Rural Affairs, source of road noise data
  • PlanIt, source of planning application records
Energy

Energy performance

Every EPC certificate filed against this property — current rating, recorded improvements, and where there's headroom to reach a higher band.

23 Caroline Square's carbon output is low for the local stock.

Current Certificate(1 of 2)
Jul 2025

EPC Rating

A
B
B82
C
D
E
F
G
Main Heating
—
Main Fuel
Gas
Hot Water
Average
Windows
Average
CO2 Emissions
1.0 t/year
Occupancy
Rented
SDL Surveying

Get a survey for this property

Level 2 HomeBuyer Report

21st century1st Floor FlatEPC B

We've checked 10 risk factors against the available data for this property and believe a Level 2 HomeBuyer Report could be a suitable option for you.

From £495 · Includes VAT

Planning

Planning history

Applications and permits filed against 23 Caroline Square, King William Street, Portsmouth, PO1 3JG, sourced from the PlanIt planning register.

23 Caroline Square has no planning applications on record.

3

But the area is active

3 notable applications nearby — larger schemes and conversions that could reshape the street. The report maps them all.

Price

Sales history & valuation

Recorded transactions, our model's current estimate, and a quick read on what neighbouring properties have sold for.

23 Caroline Square has no Land Registry sales on file, suggesting it has stayed in the same hands since registration began.

Current estimate

£167,000

Modelled from EPC, postcode comparables.

See how we calculated this

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.

On the street

Versus other King William Street homes

Four headline reads against 42 similar flats on this street, drawn from the latest EPC and Land Registry data.

CO₂ Emissions for 23 Caroline Square runs comfortably ahead of the street norm.

EPC Rating

82 (B)

Street avg 80 (C)

Strongly above

Floor Area

55 m²

Street avg 58 m²

Below

CO₂ Emissions

1.0 t/year

Street avg 1.3 t/year

Strongly above

Habitable Rooms

2 rooms

Street avg 2 rooms

Below
Before you decide

Everything you need to know about 23 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

Preview of the full property report

The data behind every report

  • HM Land Registry, source of sold price history
  • Department for Education, source of schools data
  • Police.uk, source of crime statistics
  • Department for Transport, source of stations and transport links
  • Environment Agency, source of flood risk data
  • Department for Environment, Food & Rural Affairs, source of road noise data
  • PlanIt, source of planning application records
Comparables

Similar properties nearby

A handful of close matches in the same postcode area, ranked by likeness on bedrooms, type and floor area.
£166k

1 Admiralty Tower, Queen Street

PO1 3GA

2 bed2 bath
£166k

1 Godolphin House, Bonfire Corner

PO1 3GN

1 bed1 bath
£160k

1 Brickwood House, Cumberland Street

PO1 3FL

£157k

1 Beck Street

PO1 3AN

£157k

1 Brunswick House, Queen Street

PO1 3GB

1 bed1 bath
£179k

1 Bishop Street

PO1 3DA

£147k

1 Gloucester House, Queen Street

PO1 3GD

1 bed1 bath
£192k

1 Aylward Lodge, Aylward Street

PO1 3FW

Area

The neighbourhood at a glance

A condensed read of the local area. Each tile links through to the full breakdown on the Portsmouth district page.
Full Portsmouth report

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.

Noise

Road noise across the postcode

Modelled day and night-time noise levels around PO1 3JG from Defra's strategic mapping. The pin marks this postcode's centroid.
Daytime road noise heatmap for PO1 3JG

Daytime· 07:00 – 23:00

48.4dB

Low
Night-time road noise heatmap for PO1 3JG

Night-time· 23:00 – 07:00

40.8dB

Low
55 dB
60 dB
65 dB
70 dB
75 dB
80 dB
Defra Road Noise Strategic Mapping, Round 4
FAQ

Common questions

The questions buyers, sellers and homeowners most often ask about 23 Caroline Square, King William Street, Portsmouth, PO1 3JG. Each answer is also embedded as structured data for search engines.