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Get started9 Castle Street is a mid-terrace house in Southampton (SO14 6GZ). It has a recorded floor area of 74 m² (around 797 sq ft), construction records dating it to 1900-1929 and council tax band C. The latest certificate (June 2022) shows a C (score 70). When first surveyed in March 2010 the rating was G, the property has climbed 4 bands since. Between certificates, wall efficiency went from Poor to Average, roof efficiency went from Very Poor to Very Good and window efficiency went from Poor to Good. The recommended improvements would push it to B (score 86).
Sale prices here have outpaced Southampton HPI: 3.1% per year against 0% for the wider region. Today's modelled estimate of £255,000 is 21.4% above the 2022 sale price. On a £-per-square-foot basis, the last sale (£264/sq ft) was about 21.3% above the typical sold price in the postcode. 2 planning records sit against the property, 0 approved, 2 refused. Sold January 2022 for £210,000. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.
A subdivision application was refused at 9 Castle Street in 2023.
Use of property as 4 serviced apartments (Retrospective) (Use Class C1)
The latest sale landed in the post-pandemic price surge — useful context when reading the figure.
£255,000
Modelled from EPC, postcode comparables and a sale-price growth of 3.1% per year over 12 years.
£210,000
Growth on file: 3.1% per year over 12 years.
On co₂ emissions, 9 Castle Street stands well clear of the street.
Price per m²
£2,838
Street avg £3,113
Floor Area
74 m²
Street avg 76 m²
Habitable Rooms
4 rooms
Street avg 4 rooms
Reported crime in the wider district is trending notably upward year-on-year.
Crime
9/mo
Rising year-on-year across the wider district.
Nearest stop
0.2 km

Daytime· 07:00 – 23:00
54.7dB

Changes detected from historical EPC data
Replaced storage heaters with gas boiler
Connected to mains gas supply
Heating controls upgraded for better temperature management
Hot water system upgraded
Windows upgraded, improving insulation
Roof insulation improved
More low energy lighting installed
Heating controls changed
Hot water efficiency decreased
Window efficiency improved
Cavity wall insulation installed
Loft insulation upgraded to recommended levels
Are we missing something? Tell us about home improvements to help adjust your valuation.
Use of the property as C4 House in Multiple Occupation (Amended Description)
31 January 2022Most recent
£210,000
+43.8%over 11 years13 May 2010
£146,000
Median price across the last 5 sales in SO14 6GZ: £232,500 (2025–2020).
CO₂ Emissions
2.4 t/year
Street avg 2.9 t/year
Denzil Avenue — bus stop.
Closest school
0.3 km
Bevois Town Primary School. 38 schools nearby.
Night-time· 23:00 – 07:00
44.5dB
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