21 Janson Road, Southampton, SO15 5FU
About 21 Janson Road
21 Janson Road is a semi-detached house in Southampton (SO15 5FU). It has a recorded floor area of 150 m² (around 1615 sq ft), construction records dating it to 1930-1949 and council tax band B. The latest certificate (April 2021) shows a D (score 67), on the cusp of jumping into the C band. The recommended improvements would push it to C (score 76).
One planning record on file: subdivision approved in 2022. Past consents include subdivision, meaningful when judging how the property has evolved. Today's modelled estimate of £427,000 is 33.4% above the 2021 sale price. On a £-per-square-foot basis, the last sale (£198/sq ft) was about 36.6% above the typical sold price in the postcode. Sold September 2021 for £320,000. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.
Everything you need to know about 21 Janson Road
The true value, the hidden risks and the full sale history, in one report.
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The data behind every report
Energy performance
EPC Rating
Certificate validity
Valid until 11 April 2031
Get a survey for this property
Level 3 Building Survey
Because the property has been extended more than once, we believe a Level 3 building survey should be considered.
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Planning history
Council records show a subdivision application — the property's legal arrangement has been altered.
1 application on record at 21 Janson Road, Southampton, SO15 5FU
- Dec 2022SubdivisionFullOutcome in report
Conversion of existing 2 flats into a 3-bed house (Retrospective)
Retrospective- Documents
- 9 docs on file
- Reference
- 21/01717/FUL
Unlock 21 Janson Road, Southampton, SO15 5FU's full planning history
You're seeing the shape of it. The report has the substance.
- Every decision — granted, refused or withdrawn (1 on record)
- All 1 application on this property in full, plus 29 notable nearby
- The 9 documents, officer reports & conditions
- What the pattern means for extending or converting here
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Sales history & valuation
The latest sale landed in the post-pandemic price surge — useful context when reading the figure.
£427,000
Modelled from EPC, postcode comparables.
£320,000
Recorded with HM Land Registry.
Sales timeline
22 September 2021Most recent
£320,000
Median price across the last 5 sales in SO15 5FU: £372,000 (2025–2021).
Nearby sales in SO15 5FU
Versus other Janson Road homes
Habitable Rooms for 21 Janson Road runs comfortably ahead of the street norm.
Price per m²
£2,133
Street avg £2,210
Floor Area
150 m²
Street avg 140 m²
Habitable Rooms
9 rooms
Street avg 6 rooms
CO₂ Emissions
4.4 t/year
Street avg 4.8 t/year
Everything you need to know about 21 Janson Road
The true value, the hidden risks and the full sale history, in one report.
Pick your report · from £14.99
One time fee only - money back guarantee
The data behind every report
Similar properties nearby
The neighbourhood at a glance
Crime
460/mo
Steady year-on-year across the wider district.
Nearest stop
0.2 km
Grove Road — bus stop.
Closest school
0.4 km
St Mark's Church of England School. 31 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
51.6dB
Night-time· 23:00 – 07:00
41.5dB