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 123 15, Portman Square, Marble Arch, W1H 6LL	17 Nov 2006	£350,000	62 m² 667 sqft	£5,645 £524	Flat (1 bed)
Flat 111 15, Portman Square, Marble Arch, W1H 6LL	27 Oct 2006	£617,000	96 m² 1033 sqft	£6,427 £597	Flat (3 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 2 15, Portman Square, Marble Arch, W1H 6LJ	07 Sep 2006	£180,000			Flat (Studio)
Flat 40 Fitzhardinge House, Portman Square, Marble Arch, W1H 6LH -	12 May 2006	£665,000	87 m² 936 sqft	£7,643 £710	Flat (2 bed)
Flat 51 Fitzhardinge House, Portman Square, Marble Arch, W1H 6LH -	22 Mar 2006	£665,000	85 m² 914 sqft	£7,823 £726	Flat (2 bed)
Flat 5 Orchard Court, Portman Square, Marble Arch, W1H 6LE	30 Jan 2006	£1,900,000			Flat (4 bed)
Flat 35 Fitzhardinge House, Portman Square, Marble Arch, W1H 6LH	20 Jan 2006	£302,000			Flat (2 bed)
Flat 105 15, Portman Square, Marble Arch, W1H 6LL	30 Nov 2005	£625,000			Flat (2 bed)
Flat 48 Fitzhardinge House, Portman Square, Marble Arch, W1H 6LH -	15 Oct 2005	£500,000	83 m² 893 sqft	£6,024 £559	Flat (2 bed)
Flat 9 15, Portman Square, Marble Arch, W1H 6LJ	15 Jul 2005	£200,000			Flat
Flat 21 Fitzhardinge House, Portman Square, Marble Arch, W1H 6LQ -	30 Jun 2005	£440,000	68 m² 731 sqft	£6,470 £601	Flat (2 bed)
Flat 60 15, Portman Square, Marble Arch, W1H 6LJ	24 Jun 2005	£580,000	106 m² 1140 sqft	£5,471 £508	Flat (3 bed)
Flat 88 15, Portman Square, Marble Arch, W1H 6LL	21 Apr 2005	£399,000			Flat (2 bed)
Flat 1 15, Portman Square, Marble Arch, W1H 6LJ	22 Mar 2005	£120,000			Flat (Studio)
Flat 124 15, Portman Square, Marble Arch, W1H 6LL	21 Jan 2005	£480,000			Flat (3 bed)
Flat 20 15, Portman Square, Marble Arch, W1H 6LJ	17 Dec 2004	£555,000	91 m² 979 sqft	£6,098 £566	Flat (2 bed)
Flat 15 15, Portman Square, Marble Arch, W1H 6LJ	25 Nov 2004	£322,500	55 m² 592 sqft	£5,863 £544	Flat (1 bed)
Flat 35 Orchard Court, Portman Square, Marble Arch, W1H 6LF -	04 Nov 2003	£1,800,000			Flat (6 bed)
Flat 61 15, Portman Square, Marble Arch, W1H 6LJ	25 Sep 2003	£535,000	105 m² 1130 sqft	£5,095 £473	Flat (4 bed)
Flat 75 15, Portman Square, Marble Arch, W1H 6LL	26 Jun 2003	£425,000	108 m² 1162 sqft	£3,935 £365	Flat (3 bed)
Flat 51 15, Portman Square, Marble Arch, W1H 6LJ	16 Jun 2003	£950,000			Flat
Flat 43 15, Portman Square, Marble Arch, W1H 6LJ	11 Mar 2003	£542,500			Flat
Flat 17 15, Portman Square, Marble Arch, W1H 6LJ	30 Oct 2002	£320,000	103 m² 1108 sqft	£3,106 £288	Flat (2 bed)
Flat 55 Orchard Court, Portman Square, Marble Arch, W1H 6LG	25 Sep 2002	£1,075,000			Flat (3 bed)
Flat 32 15, Portman Square, Marble Arch, W1H 6LJ	20 Sep 2002	£500,000	82 m² 882 sqft	£6,097 £566	Flat (2 bed)
Flat 25 15, Portman Square, Marble Arch, W1H 6LJ	08 Aug 2002	£824,500			Flat (4 bed)
Flat 51 15, Portman Square, Marble Arch, W1H 6LJ	05 Jul 2002	£775,000			Flat
Flat 21 Orchard Court, Portman Square, Marble Arch, W1H 6LE	07 Feb 2002	£1,850,000	364 m² 3918 sqft	£5,082 £472	Flat (4 bed)
Flat 123 15, Portman Square	£350,000 Nov-2006	62 667	5,645 524
Flat 111 15, Portman Square	£617,000 Oct-2006	96 1033	6,427 597
Flat 9 15, Portman Square	£270,000 Oct-2006
Penthouse E 15, Portman Square	£1,150,000 Oct-2006	180 1937	6,388 593
Flat 2 15, Portman Square	£180,000 Sep-2006
Flat 40 Fitzhardinge House, Portman Square -	£665,000 May-2006	87 936	7,643 710
Flat 51 Fitzhardinge House, Portman Square -	£665,000 Mar-2006	85 914	7,823 726
Flat 5 Orchard Court, Portman Square	£1,900,000 Jan-2006
Flat 35 Fitzhardinge House, Portman Square	£302,000 Jan-2006
Flat 105 15, Portman Square	£625,000 Nov-2005
Flat 48 Fitzhardinge House, Portman Square -	£500,000 Oct-2005	83 893	6,024 559
Flat 9 15, Portman Square	£200,000 Jul-2005
Flat 21 Fitzhardinge House, Portman Square -	£440,000 Jun-2005	68 731	6,470 601
Flat 60 15, Portman Square	£580,000 Jun-2005	106 1140	5,471 508
Flat 88 15, Portman Square	£399,000 Apr-2005
Flat 1 15, Portman Square	£120,000 Mar-2005
Flat 124 15, Portman Square	£480,000 Jan-2005
Flat 20 15, Portman Square	£555,000 Dec-2004	91 979	6,098 566
Flat 15 15, Portman Square	£322,500 Nov-2004	55 592	5,863 544
Flat 35 Orchard Court, Portman Square -	£1,800,000 Nov-2003
Flat 61 15, Portman Square	£535,000 Sep-2003	105 1130	5,095 473
Flat 75 15, Portman Square	£425,000 Jun-2003	108 1162	3,935 365
Flat 51 15, Portman Square	£950,000 Jun-2003
Flat 43 15, Portman Square	£542,500 Mar-2003
Flat 17 15, Portman Square	£320,000 Oct-2002	103 1108	3,106 288
Flat 55 Orchard Court, Portman Square	£1,075,000 Sep-2002
Flat 32 15, Portman Square	£500,000 Sep-2002	82 882	6,097 566
Flat 25 15, Portman Square	£824,500 Aug-2002
Flat 51 15, Portman Square	£775,000 Jul-2002
Flat 21 Orchard Court, Portman Square	£1,850,000 Feb-2002	364 3918	5,082 472

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 the selling price 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).