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1 bed flat for sale One Casson Square, London, SE1

Asking price

£890,000

Added on 29/09/2026

Type: Flat
Bedrooms: 1
Bathrooms: 1
Size: £1,732 per sq ft
Tenure: Ask agent

EPC B 85

Key features

Stunning apartment
514 sq ft (47.75 sqm)
Juliet balcony
Residents' health club and restorative spa
Exclusive residents' lounge and private dining area
24 hour concierge

About this property

This elegantly designed one bedroom apartment, located in an excellent position, is available for chain free sale in One Casson Square, Southbank Place.

The apartment offers 514 sq ft (47.75 sqm) of internal space and benefits from having excellent finishes throughout.

Apartment interiors blend traditional and modern approaches with combinations of high quality natural materials creating a harmonious and durable feel.

Floorplan

Energy performance

B 85

Current

Potential

92+

81-91

85 B

69-80

55-68

39-54

21-38

1-20

This home is rated band B, scoring 85 out of 100. The average British home is band D.

Read from the certificate published with this listing, so it may not be the latest one. Check the government EPC register for the full certificate and its recommendations.

Council tax

Ask agent

Per year

Band A

£700
Band B

£816
Band C

£933
Band D

£1,050
Band E

£1,283
Band F

£1,516
Band G

£1,749
Band H

£2,099

The agent hasn't said which band this home is in; you can look it up on GOV.UK. In Westminster, 2026/27 bills run from £700 a year in band A to £2,099 in band H.

Figures from MHCLG (Open Government Licence v3): the average bill for each band across Westminster, including the typical parish precept, so a parish's own bill can differ a little. Discounts lower the bill, such as 25% off for an adult living alone.

Price guide

100 comparables · within 0.8 miles

Priced above 76% of the 1-bed flats for sale nearby right now.

This home, £890,000 Median £695,000 · £375,000 – £1,250,000

Per square foot

£1,732 38% over

1-bed flats nearby £1,252

Against sold prices

111% over

SE1 sold median £820 / sq ft, 1,276 sales

Compared with 100 1-bed flats for sale within 0.8 miles, on the market now or already under offer. The range is the middle 80% of their asking prices. Sold prices are HM Land Registry sales in SE1 over the last 24 months, per square foot of EPC floor area. All sold £/sq ft in SE1 →

Location

One Casson Square, London, SE1

Open map Street View

Mortgage and stamp duty

Property price £890,000

£445k £1.3m

Deposit10% £89,000

£0 £890k

Interest rate 4.5%

0.5% 15%

Repayment period 25 years

5 years 40 years

A £801,000 mortgage. Most lenders would want a household income of about £178,000 to support it.

A guide only, for a capital repayment mortgage. The rate you are offered and what you can borrow depend on your circumstances and a full application with a lender or broker. Your home may be repossessed if you do not keep up repayments on your mortgage.

Properties sold nearby

HM Land Registry sales nearby. Floor areas from Energy Performance Certificates where matched.

Address	Type	Sold	Size	Size	£/sq ft	Price
2101, 1, Casson Square Flat / maisonette	Flat / maisonette	Jul 2025	n/a	n/a	n/a	£1,800,000
2106, 1, Casson Square Flat / maisonette	Flat / maisonette	Mar 2025	n/a	n/a	n/a	£1,250,000
1701, 1, Casson Square Flat / maisonette	Flat / maisonette	Feb 2025	n/a	n/a	n/a	£1,500,000
2201, 1, Casson Square Flat / maisonette	Flat / maisonette	Mar 2024	n/a	n/a	n/a	£1,875,000
2407, 1, Casson Square Flat / maisonette · new build	Flat / maisonette · new build	Nov 2022	n/a	n/a	n/a	£869,825
2007, 1, Casson Square Flat / maisonette · new build	Flat / maisonette · new build	Sept 2022	n/a	n/a	n/a	£865,000
2206, 1, Casson Square Flat / maisonette · new build	Flat / maisonette · new build	Jun 2022	n/a	n/a	n/a	£1,229,300
2104, 1, Casson Square Flat / maisonette · new build	Flat / maisonette · new build	Jan 2022	n/a	n/a	n/a	£1,679,007