21 Castle Street, Southampton, SO14 6GZ
About 21 Castle Street
21 Castle Street is a four-bedroom mid-terrace house in Southampton (SO14 6GZ). It has a recorded floor area of 90 m² (around 969 sq ft), construction records dating it to 1900-1929 and council tax band C. The property has solar panels on record, all of which lower running costs and tend to lift resale appeal. The latest certificate (June 2024) shows a C (score 71). The rating has held steady at C across 2 certificates since November 2013. Between certificates, lighting went from Average to Very Good; while roof efficiency dropped from Average to Poor. The recommended improvements would push it to B (score 84).
At 90 m² it's 20.8% larger than the typical home in the postcode (75 m² median across 8 EPCs). Last changed hands 10 years ago, in January 2017. Across 2001–2017, sale prices on this property compounded at 6.1% per year. Today's modelled estimate of £309,000 is 47.1% above the 2017 sale price.
What this property has
Inside
- Bedrooms4
- Bathrooms2
Building
- Solar panelsYes
Everything you need to know about 21 Castle Street
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 24 June 2034
Property Improvements
Changes detected from historical EPC data
Heating controls upgraded for better temperature management
More low energy lighting installed
Get a survey for this property
Level 3 Building Survey
Because the property was built before 1919, we believe a Level 3 building survey should be considered.
From £955 · Includes VAT
Planning history
21 Castle Street has no planning applications on record.
But the area is active
38 notable applications nearby — larger schemes and conversions that could reshape the street. The report maps them all.
Sales history & valuation
Sale price has at least doubled since 2001.
£309,000
Modelled from EPC, postcode comparables and a sale-price growth of 6.1% per year over 15 years.
£210,000
Growth on file: 6.1% per year over 15 years.
Sales timeline
17 January 2017Most recent
£210,000
+147.1%over 15 years25 September 2001
£85,000
Median price across the last 5 sales in SO14 6GZ: £232,000 (2025–2021).
Nearby sales in SO14 6GZ
Versus other Castle Street homes
On price per m², 21 Castle Street runs well behind the street norm.
Price per m²
£2,333
Street avg £3,185
Floor Area
90 m²
Street avg 74 m²
Habitable Rooms
5 rooms
Street avg 4 rooms
CO₂ Emissions
2.7 t/year
Street avg 2.9 t/year
Everything you need to know about 21 Castle Street
The true value, the hidden risks and the full sale history, in one report.
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The neighbourhood at a glance
Crime
413/mo
Steady year-on-year across the wider district.
Nearest stop
0.2 km
Denzil Avenue — bus stop.
Closest school
0.3 km
Bevois Town Primary School. 38 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
54.7dB
Night-time· 23:00 – 07:00
44.5dB