20 William Square
SE16 5XJ
- Flat
- Leasehold
What the sales records show
From an older sale: a rough guide£685,000
Range £582,000 to £788,000
Since last sale
+£585,000
+585.0% since Jul 1995, +6.3% a year
Rank in SE16 5XJ
6th of 34
Postcode average £522,088
There is no floor area on record, so this is the home's last sale moved from July 1995 to August 2026 by the official UK House Price Index for Southwark, with the range widened the older the sale. It cannot see condition, layout or recent work, so it is not a valuation.
In short
20 William Square is a leasehold flat in SE16.
There is no floor area on record, so its last sale has been moved to today by the official price index for Southwark: £582,000 to £788,000, about £685,000 in the middle.
That makes it the 6th highest of the 34 homes we can compare in SE16 5XJ, where the middle figure averages £522,088.
It last sold for £100,000 in July 1995; the price index suggests it has gained about £585,000 since, roughly +6.3% a year.
Across Southwark, average prices fell 2.1% in the year to August 2026.
Where in the range would yours sell?
Condition and improvements usually decide it, and only someone who sees the home can say.
Lower end
£582,000
Middle
£685,000
Upper end
£788,000
Done work since the records were made? Claim your home and tell us, or ask local agents where yours sits.
On the map
Where 20 William Square is
20 William Square on the map
This home and the completed sales its figure is worked out from. Choose a pin for the address, size and date.
The Land Registry records a sale by its postcode, so pins sit at the postcode, close to the home, not on its doorstep. Map: contains OS data © Crown copyright and database rights 2026.
History
What it has sold for
Sale history
Every sale of this home registered with HM Land Registry since 1995
| Sold | Price paid | Change | A year |
|---|---|---|---|
| July 1995 | £100,000 | First sale | – |
Nearby
Neighbours and the sales behind the figure
Homes in SE16 5XJ
Ranked by what comparable sales show. Choose one to see its page.
Recent sales of flat homes nearby
The closest sales of the same type in the last two years, registered with HM Land Registry. Choose one to see its page.
| Home | Price | Sold | Size | Per sq ft | Away |
|---|---|---|---|---|---|
| 21 William SquareSE16 5XJ · Flat | £425,000 | Feb 2026 | 678 sq ft | £627 | < 0.1 mi |
| 31 William SquareSE16 5XJ · Flat | £328,000 | Jan 2025 | 560 sq ft | £586 | < 0.1 mi |
| 484 Rotherhithe StreetSE16 5EG · Flat | £350,000 | Mar 2026 | – | – | < 0.1 mi |
| 482 Rotherhithe StreetSE16 5EG · Flat | £360,000 | Mar 2025 | – | – | < 0.1 mi |
| 4 Sophia SquareSE16 5XL · Flat | £332,500 | May 2025 | 581 sq ft | £572 | < 0.1 mi |
| 26 Edward SquareSE16 5EE · Flat | £515,000 | May 2026 | 904 sq ft | £570 | < 0.1 mi |
| 18 Edward SquareSE16 5EE · Flat | £600,000 | Jul 2025 | 915 sq ft | £656 | < 0.1 mi |
| 22 Lavender RoadSE16 5DZ · Flat | £317,000 | Mar 2025 | 474 sq ft | £669 | 0.1 mi |
| 25 Lavender RoadSE16 5DZ · Flat | £475,000 | Mar 2025 | 463 sq ft | £1,026 | 0.1 mi |
| Flat 11, 406 - 438 Rotherhithe StreetSE16 5EH · Flat | £265,000 | Nov 2024 | – | – | 0.1 mi |
| 22 Elizabeth SquareSE16 5XN · Flat | £320,000 | Nov 2025 | 452 sq ft | £708 | 0.1 mi |
| Flat 14, Prince Regent Court, 36 Edward SquareSE16 5EB · Flat | £430,000 | Jul 2026 | – | – | 0.1 mi |
The area
SE16 at a glance
What buyers have paid in SE16
Completed sales in the last 12 months, against the 12 months before
Flats
Terraced
Semi-detached
Detached
| Type | Sales | Average price | Average size | Per sq ft | On the year |
|---|---|---|---|---|---|
| All homes | 344 | £505,631 | 755 sq ft | £639 | −37.6% |
| Flats | 284 | £457,227 | 686 sq ft | £625 | +1.3% |
| Terraced | 46 | £734,696 | 1,085 sq ft | £702 | −0.7% |
| Semi-detached | 4 | £792,500 | 1,195 sq ft | £735 | +5.2% |
| Detached | 1 | £645,000 | – | – | – |
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Contains HM Land Registry data © Crown copyright and database right 2026. Licensed under the Open Government Licence v3.0.
Energy performance data © Crown copyright. Licensed under the Open Government Licence v3.0.
Contains HM Land Registry UK House Price Index data © Crown copyright. Licensed under the Open Government Licence v3.0.
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