Model valuation£417,0008 Busby Close
Local market context
25 Caroline Square, King William Street, Portsmouth, PO1 3JG
Property type
Detached
Floor 02
Habitable rooms
3
From EPC
Floor area
55 m²
592 sq ft
Energy rating
C
Score 79
Council tax
Band B
Tenure
Social Rental
About 25 Caroline Square
A plain-English summary derived from public records, EPC certificates, sold prices and local data.
25 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 bottom. The latest certificate (July 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 Average.
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The data behind every report
Energy performance
Every EPC certificate filed against this property — current rating, recorded improvements, and where there's headroom to reach a higher band.
25 Caroline Square's carbon output is low for the local stock.
Current Certificate(1 of 2)
Jul 2025
EPC Rating
A
B
C
C79
D
E
F
G
Main Heating
—
Main Fuel
Gas
Hot Water
Average
Windows
Average
CO2 Emissions
1.2 t/year
Occupancy
Rented
Certificate validity
Valid until 23 July 2035
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Level 2 HomeBuyer Report
21st century2nd Floor FlatEPC C
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Planning history
Applications and permits filed against 25 Caroline Square, King William Street, Portsmouth, PO1 3JG, sourced from the PlanIt planning register.
25 Caroline Square has no planning applications on record.
2
But the area is active
2 notable applications nearby — larger schemes and conversions that could reshape the street. The report maps them all.
Sales history & valuation
Recorded transactions, our model's current estimate, and a quick read on what neighbouring properties have sold for.
25 Caroline Square has no Land Registry sales on file, suggesting it has stayed in the same hands since registration began.
Current estimate
See how we calculated this£174,000
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
Four headline reads against 42 similar flats on this street, drawn from the latest EPC and Land Registry data.
25 Caroline Square outperforms the street on habitable rooms by a wide margin.
EPC Rating
79 (C)
Street avg 80 (C)
Floor Area
55 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
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Start your researchSimilar properties nearby
A handful of close matches in the same postcode area, ranked by likeness on bedrooms, type and floor area.
£171k
1 Admiralty Tower, Queen Street
PO1 3GA
2 bed2 bath
£171k
1 Godolphin House, Bonfire Corner
PO1 3GN
1 bed1 bath
£166k
1 Brickwood House, Cumberland Street
PO1 3FL
£183k
1 Caroline Square, King William Street
PO1 3JG
£184k
1 Bishop Street
PO1 3DA
£164k
1 Gloucester House, Queen Street
PO1 3GD
1 bed1 bath
£186k
1 Aylward Lodge, Aylward Street
PO1 3FW
£153k
1 Brunswick House, Queen Street
PO1 3GB
1 bed1 bath
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.
Rail-style transport is unusually close for this postcode.
Crime
501/mo
Falling 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
Modelled day and night-time noise levels around PO1 3JG from Defra's strategic mapping. The pin marks this postcode's centroid.
Daytime· 07:00 – 23:00
48.4dB
Night-time· 23:00 – 07:00
40.8dB
55 dB
60 dB
65 dB
70 dB
75 dB
80 dB
Defra Road Noise Strategic Mapping, Round 4Common questions
The questions buyers, sellers and homeowners most often ask about 25 Caroline Square, King William Street, Portsmouth, PO1 3JG. Each answer is also embedded as structured data for search engines.