21a, Flat 203, Rothsay Street, Southwark, London, SE1 4BF
About 21a
21a is a mid-terrace house in Southwark, London, London (SE1 4BF). It has a recorded floor area of 76 m² (around 818 sq ft) and construction records dating it to 2003-2006. The latest certificate (April 2026) shows a C (score 80), near the top of the C band. The rating has held steady at C across 2 certificates since September 2016. Between certificates, hot-water efficiency went from Poor to Average, lighting went from Average to Very Good and main heating went from Very Poor to Poor. Main heating runs on electricity. This certificate was lodged in the last six months, so the rating reflects current condition. At 76 m² this is the 28th smallest of 36 units on EPC record in 21a, where floor areas span 47–163 m². The building's EPC ratings span D to B across 36 units on file.
At 76 m² it's 26.7% larger than the typical home in the postcode (60 m² median across 35 EPCs).
Everything you need to know about 21a
The true value, the hidden risks and the full sale history, in one report.
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Energy performance
21a's carbon output is low for the local stock.
EPC Rating
Certificate validity
Valid until 14 April 2036
Property Improvements
Changes detected from historical EPC data
Hot water efficiency improved
More low energy lighting installed
Get a survey for this property
Level 3 Building Survey
Because the property has no mains gas supply, we believe a Level 3 building survey should be considered.
From £1,085 · Includes VAT
Planning history
21a has no planning applications on record.
But the area is active
6 notable applications nearby — larger schemes and conversions that could reshape the street. The report maps them all.
Sales history & valuation
21a has no Land Registry sales on file, suggesting it has stayed in the same hands since registration began.
£590,000
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 Rothsay Street homes
On co₂ emissions, 21a stands well clear of the street.
EPC Rating
80 (C)
Street avg 73 (C)
Floor Area
76 m²
Street avg 70 m²
CO₂ Emissions
0.5 t/year
Street avg 2.0 t/year
Habitable Rooms
3 rooms
Street avg 3 rooms
Everything you need to know about 21a
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
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The neighbourhood at a glance
Crime
1516/mo
Steady year-on-year across the wider district.
Nearest stop
0.2 km
Twr Bridge Rd/Bricklayers Arms — bus stop.
Closest school
0.2 km
Grange Primary School. 97 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
58.2dB
Night-time· 23:00 – 07:00
48.8dB