The Cassini Building, 34 Mercator Close, Southampton, SO16 4HW
About The Cassini Building
The Cassini Building is a detached house in Southampton (SO16 4HW). It has a recorded floor area of 60 m² (around 646 sq ft). The latest certificate (April 2017) returns a high B (score 91), putting the home a stone's throw from an A rating. At 60 m² this is the 5th smallest of 12 units on EPC record in The Cassini Building, where floor areas span 57–61 m². The building's EPC ratings span B to A, with this unit at the bottom. On EPC score it ranks last in the building (91 versus a best of 92).
Across 2017–2021, sale prices on this property compounded at -4.2% per year. Today's modelled estimate of £189,000 is 20% above the 2021 sale price. On a £-per-square-foot basis, the last sale (£244/sq ft) was about 23.3% below the postcode norm. Sold April 2021 for £157,500. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.
Everything you need to know about The Cassini Building
The true value, the hidden risks and the full sale history, in one report.
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Energy performance
The Cassini Building's carbon output is low for the local stock.
EPC Rating
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Planning history
The Cassini Building has no planning applications on record.
But the area is active
9 notable applications nearby — larger schemes and conversions that could reshape the street. The report maps them all.
Sales history & valuation
The latest sale landed in the post-pandemic price surge — useful context when reading the figure.
£189,000
Modelled from EPC, postcode comparables and a sale-price growth of -4.2% per year over 4 years.
£157,500
Growth on file: -4.2% per year over 4 years.
Sales timeline
20 April 2021Most recent
£157,500
-15.5%over 3 years11 May 2017
£186,500
Median price across the last 5 sales in SO16 4HW: £203,000 (2025–2023).
Nearby sales in SO16 4HW
23 Mercator Close, Southampton, SO16 4HW
Sold Oct 2025
£360,000The Cassini Building, 35 Mercator Close, Southampton, SO16 4HW
Sold Mar 2025
£203,000The Cassini Building, 31 Mercator Close, Southampton, SO16 4HW
Sold Oct 2024
£178,000The Lennox Building, 46 Mercator Close, Southampton, SO16 4HW
Sold Nov 2023
£148,000The Cassini Building, 28 Mercator Close, Southampton, SO16 4HW
Sold Aug 2023
£210,000
Versus other Mercator Close homes
Price per m² for The Cassini Building lags the street by a wide margin.
Price per m²
£2,625
Street avg £3,096
Floor Area
60 m²
Street avg 55 m²
CO₂ Emissions
0.3 t/year
Street avg 0.2 t/year
Years Held
5 years
Street avg 7 years
Everything you need to know about The Cassini Building
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
The data behind every report
Similar properties nearby
The neighbourhood at a glance
Crime
9/mo
Steady year-on-year across the wider district.
Nearest stop
0.1 km
Maybush Corner — bus stop.
Closest school
0.5 km
Oasis Academy Lord's Hill. 27 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
52.9dB
Night-time· 23:00 – 07:00
43.4dB