Sort by Most recent sale Address Highest price Highest £ per sqm Largest area Smallest area	Last sold	Price paid	Floor area (m²) Floor area (sq ft)	£ per m² £ per sq ft	Type	Sold	m² sq ft	£/m² £/sq ft
Flat 41 15, Portman Square, Marble Arch, W1H 6LJ	23 Nov 2023	£975,000 B	102 m² 1097 sqft	£9,558 £887	Flat (2 bed)
Flat 3 15, Portman Square, Marble Arch, W1H 6LJ -	13 Oct 2023	£450,000			Flat (2 bed)
Flat 16 15, Portman Square, Marble Arch, W1H 6LJ	14 Aug 2023	£2,715,000 B	144 m² 1550 sqft	£18,854 £1,751	Flat (2 bed)
Flat 26 15, Portman Square, Marble Arch, W1H 6LJ -	21 Jul 2023	£1,950,000	84 m² 904 sqft	£23,214 £2,156	Flat (2 bed)
Flat 30 15, Portman Square, Marble Arch, W1H 6LJ -	19 Jan 2023	£2,545,000	105 m² 1130 sqft	£24,238 £2,251	Flat (3 bed)
Flat 29 15, Portman Square, Marble Arch, W1H 6LJ -	22 Jul 2022	£2,150,000	106 m² 1140 sqft	£20,283 £1,884	Flat (3 bed)
Flat 37 15, Portman Square, Marble Arch, W1H 6LJ -	01 Jul 2022	£2,000,000	144 m² 1550 sqft	£13,888 £1,290	Flat (4 bed)
Flat 66 15, Portman Square, Marble Arch, W1H 6LJ -	26 Feb 2021	£2,000,000	107 m² 1151 sqft	£18,691 £1,736	Flat (2 bed)
Flat 27 15, Portman Square, Marble Arch, W1H 6LJ -	15 Jan 2021	£3,500,000			Flat (4 bed)
Flat 19 15, Portman Square, Marble Arch, W1H 6LJ -	16 Jul 2020	£3,150,000	133 m² 1431 sqft	£23,684 £2,200	Flat
Flat 35 15, Portman Square, Marble Arch, W1H 6LJ	01 Feb 2018	£2,252,056	107 m² 1151 sqft	£21,047 £1,955	Flat (2 bed)
Flat 47 15, Portman Square, Marble Arch, W1H 6LJ -	16 Oct 2017	£2,100,000	108 m² 1162 sqft	£19,444 £1,806	Flat (3 bed)
Flat 56 15, Portman Square, Marble Arch, W1H 6LJ -	31 Jul 2017	£1,385,000	80 m² 861 sqft	£17,312 £1,608	Flat (2 bed)
Flat 49 15, Portman Square, Marble Arch, W1H 6LJ -	15 Jul 2016	£2,100,000	139 m² 1496 sqft	£15,107 £1,403	Flat (4 bed)
Flat 42 15, Portman Square, Marble Arch, W1H 6LJ	15 May 2015	£2,000,000			Flat (2 bed)
Flat 33 15, Portman Square, Marble Arch, W1H 6LJ	12 Mar 2015	£1,820,000			Flat
Flat 51 15, Portman Square, Marble Arch, W1H 6LJ	17 Oct 2013	£5,250,000			Flat
Flat 6 15, Portman Square, Marble Arch, W1H 6LJ -	18 Sep 2013	£975,000			Flat (1 bed)
Flat 31 15, Portman Square, Marble Arch, W1H 6LJ -	06 Sep 2013	£1,900,000	142 m² 1528 sqft	£13,380 £1,243	Flat (4 bed)
Flat 51 15, Portman Square, Marble Arch, W1H 6LJ	04 Apr 2011	£3,200,000			Flat
Flat 23 15, Portman Square, Marble Arch, W1H 6LJ -	17 Feb 2011	£1,220,000	107 m² 1151 sqft	£11,401 £1,059	Flat (2 bed)
Flat 38 15, Portman Square, Marble Arch, W1H 6LJ -	23 Mar 2010	£1,000,000	81 m² 871 sqft	£12,345 £1,146	Flat (2 bed)
Flat 9 15, Portman Square, Marble Arch, W1H 6LJ	19 Mar 2010	£420,000			Flat
Flat 11 15, Portman Square, Marble Arch, W1H 6LJ -	16 Nov 2009	£695,000	67 m² 721 sqft	£10,373 £963	Flat (2 bed)
Flat 54 15, Portman Square, Marble Arch, W1H 6LJ -	30 Oct 2009	£1,320,000	105 m² 1130 sqft	£12,571 £1,167	Flat (3 bed)
Flat 44 15, Portman Square, Marble Arch, W1H 6LJ	25 Aug 2007	£775,000			Flat
Flat 59 15, Portman Square, Marble Arch, W1H 6LJ	23 Mar 2007	£740,000			Flat (2 bed)
Flat 14 15, Portman Square, Marble Arch, W1H 6LJ -	08 Dec 2006	£400,000	71 m² 764 sqft	£5,633 £523	Flat (1 bed)
Flat 9 15, Portman Square, Marble Arch, W1H 6LJ	17 Oct 2006	£270,000			Flat
Penthouse E 15, Portman Square, Marble Arch, W1H 6LJ	04 Oct 2006	£1,150,000	180 m² 1937 sqft	£6,388 £593	Flat (5 bed)
Flat 41 15, Portman Square	£975,000 B Nov-2023	102 1097	9,558 887
Flat 3 15, Portman Square -	£450,000 Oct-2023
Flat 16 15, Portman Square	£2,715,000 B Aug-2023	144 1550	18,854 1,751
Flat 26 15, Portman Square -	£1,950,000 Jul-2023	84 904	23,214 2,156
Flat 30 15, Portman Square -	£2,545,000 Jan-2023	105 1130	24,238 2,251
Flat 29 15, Portman Square -	£2,150,000 Jul-2022	106 1140	20,283 1,884
Flat 37 15, Portman Square -	£2,000,000 Jul-2022	144 1550	13,888 1,290
Flat 66 15, Portman Square -	£2,000,000 Feb-2021	107 1151	18,691 1,736
Flat 27 15, Portman Square -	£3,500,000 Jan-2021
Flat 19 15, Portman Square -	£3,150,000 Jul-2020	133 1431	23,684 2,200
Flat 35 15, Portman Square	£2,252,056 Feb-2018	107 1151	21,047 1,955
Flat 47 15, Portman Square -	£2,100,000 Oct-2017	108 1162	19,444 1,806
Flat 56 15, Portman Square -	£1,385,000 Jul-2017	80 861	17,312 1,608
Flat 49 15, Portman Square -	£2,100,000 Jul-2016	139 1496	15,107 1,403
Flat 42 15, Portman Square	£2,000,000 May-2015
Flat 33 15, Portman Square	£1,820,000 Mar-2015
Flat 51 15, Portman Square	£5,250,000 Oct-2013
Flat 6 15, Portman Square -	£975,000 Sep-2013
Flat 31 15, Portman Square -	£1,900,000 Sep-2013	142 1528	13,380 1,243
Flat 51 15, Portman Square	£3,200,000 Apr-2011
Flat 23 15, Portman Square -	£1,220,000 Feb-2011	107 1151	11,401 1,059
Flat 38 15, Portman Square -	£1,000,000 Mar-2010	81 871	12,345 1,146
Flat 9 15, Portman Square	£420,000 Mar-2010
Flat 11 15, Portman Square -	£695,000 Nov-2009	67 721	10,373 963
Flat 54 15, Portman Square -	£1,320,000 Oct-2009	105 1130	12,571 1,167
Flat 44 15, Portman Square	£775,000 Aug-2007
Flat 59 15, Portman Square	£740,000 Mar-2007
Flat 14 15, Portman Square -	£400,000 Dec-2006	71 764	5,633 523
Flat 9 15, Portman Square	£270,000 Oct-2006
Penthouse E 15, Portman Square	£1,150,000 Oct-2006	180 1937	6,388 593

The data above for Portman Square can be visualised as a scatter graph, this will show price trends over time.

The average price per square metre (per square foot) in Portman Square, Marble Arch is £18,991 sqm (£1,764 per sq ft), this is calculated from sold property prices of the 9 most recent sales.
There are roughly 127 homes on Portman Square, we would have expected about 18 sales each year given that in the UK people sell their homes on average once every 7 years.
In the last 4 years there have been 9 property sales in Portman Square, averaging roughly 2 home sales per year .
The average size of all the properties on Portman Square is 103 m2 (1,108 sqft).