Portman Estate Conservation Area (Westminster)

About the Portman Estate Conservation Area

The Portman Estate Conservation Area covers about 53 hectares and was designated by City of Westminster in 1990. Inside the boundary are 238 listed buildings (4 Grade I, 3 Grade II*, 231 Grade II). The most significant is 10, Portman Close W1, Grade I. 1 Article 4 direction over the area removes further householder rights, on top of the conservation area limits below. 5 Tree Preservation Order records overlap the area; every other tree here still needs six weeks’ notice before work.

What changes inside the conservation area

Conservation areas are “Article 2(3) land”. You keep most permitted development rights, but these are removed or tightened.

ProjectElsewhereIn Portman Estate CA

Rear extensionElsewhere: 3 m · 6 m with PANo 6 m / 8 m prior approval
Two-storey extensionElsewhere: 3 mNeeds planning permission
Side extensionElsewhere: Half the widthNeeds planning permission
Loft conversionElsewhere: 50 m³Needs planning permission
Garden roomElsewhere: 2.5 m high by boundariesNot beside the house
PorchElsewhere: 3 m²Same limits
Solar panelsElsewhere: 0.2 m projectionSame limits
Air source heat pumpElsewhere: 1 unitNot facing the road
Fences, walls and gatesElsewhere: 2 m · 1 m by a roadSame limits
External claddingElsewhere: Matching materialsNeeds planning permission
Tree workElsewhere: No notice6 weeks’ notice to the council
Demolition (over 115 m³)Elsewhere: AllowedNeeds planning permission

Limits for a semi-detached house under the GPDO 2015. An Article 4 direction can remove more.

Article 4 directions here

These overlap the conservation area. Householder directions remove more of the rights above; change-of-use ones don’t affect extending a house.

Article 4 Basement Development Permitted Rights RemovedHouseholder works
Article 4 Direction Class E To C3 In Central Activities ZoneChange of use

Listed buildings in the conservation area

Any work affecting these needs listed building consent, inside or out. Each links to its entry on the National Heritage List.

10, Portman Close W1Grade I
Church of St MaryGrade I
Home House (courtauld Institute)Grade I
Royal Intitute of British Architects Drawings CollectionGrade I
Church of the AnnuciationGrade II*
Drinking Fountain in the forecourt of Hertford House (The Wallace Collection)Grade II*
Roman Catholic Church of St James (spanish Place)Grade II*
1-3, Bryanston Place W1Grade II
1-3, Manchester Square W1Grade II
1-3, Montagu Place W1Grade II
1-5, Montagu Square W1Grade II
1-5, Spanish Place W1Grade II
1-7, York Street W1Grade II
1, Duke Street W1Grade II
1, New Quebec Street W1Grade II
10-20, Seymour Street W1Grade II
10, Portman Street W1Grade II
10, Upper Montagu Street W1Grade II
100 and 102, York Street W1Grade II
100-106, Blandford Street W1Grade II
104 and 106 York Street including No 1 Harcourt Street.Grade II
105-115, Baker Street W1Grade II
105A, CRAWFORD STREET W1 (See details for further address information)Grade II
106-118, Gloucester Place W1Grade II

Show all 238 listed buildings ↓

11 and 12, Upper Berkeley Street W1Grade II
11-19, SEYMOUR STREET W1 (See details for further address information)Grade II
11, Hinde Street W1Grade II
112 and 113, Crawford Street W1Grade II
113-125, Gloucester Place W1Grade II
114 and 115, Crawford Street W1Grade II
116 and 117, Crawford Street W1Grade II
117-125, George Street W1Grade II
118, CRAWFORD STREET W1 (See details for further address information)Grade II
12-14, Manchester Square W1Grade II
12-16, Upper Montagu Street W1Grade II
12, Hinde Street W1Grade II
12, Montagu Street W1Grade II
120, Crawford Street W1Grade II
122, Wigmore Street W1Grade II
124, Wigmore Street W1Grade II
126, Wigmore Street W1Grade II
128, Wigmore Street W1Grade II
13 and 14, Montagu Street W1Grade II
13 to 15, Upper Berkeley Street W1Grade II
13-17, Montagu Square W1Grade II
13, Montagu Place W1Grade II
13, Upper Montagu Street W1Grade II
130, Wigmore Street W1Grade II
14 and 15, Crawford Street W1Grade II
14-16, Wyndham Place W1Grade II
14-18, Fitzhardinge Street W1Grade II
14-19, New Quebec Street W1Grade II
15-19, Upper Montagu Street W1Grade II
16, Upper Berkeley Street W1Grade II
17-26, Harcourt Street W1Grade II
18 and 20, Upper Montagu Street W1Grade II
18-27, Manchester Street W1Grade II
18, Montagu Square W1Grade II
18, Montagu Street W1Grade II
19-27, Upper Berkeley StreetGrade II
19, Montagu Square W1Grade II
19, Montagu Street W1Grade II
1A, BRYANSTON SQUARE W1 (See details for further address information)Grade II
1a, Duke Street W1Grade II
2 and 3, Dorset Street W1Grade II
2-5, Fitzhardinge Street W1Grade II
2-5, Harcourt Street W1Grade II
2, Duke Street W1Grade II
2, Wyndham Place W1Grade II
2, York Street W1Grade II
20-22, Montagu Square W1Grade II
20, Montagu Street W1Grade II
20, York Street W1Grade II
207, OLD MARYLEBONE ROAD NW1 (See details for further address information)Grade II
21-25, New Quebec Street W1Grade II
21-75, Gloucester Place W1Grade II
21b, Gloucester Place W1Grade II
22-25, Manchester Square W1Grade II
22-36, Seymour Street W1Grade II
22, York Street W1Grade II
23-27, York Street W1Grade II
23, Dorset Street W1Grade II
23, Montagu Square W1Grade II
24-26, Montagu Square W1Grade II
24-28, York Street W1Grade II
24, George Street W1Grade II
25-37, Upper Montagu Street W1Grade II
25, Knox Street W1Grade II
25,25a and 26, Bryanston Square W1Grade II
26-28, Knox Street W1Grade II
26-34, Wyndham Street W1Grade II
26, Dorset Street W1Grade II
26, MANCHESTER SQUARE W1 (See details for further address information)Grade II
27, Dorset Street W1Grade II
28, Upper Montagu Street W1Grade II
28/32, BRYANSTON SQUARE W1 (See details for further address information)Grade II
28A, MANCHESTER STREET W1 (See details for further address information)Grade II
29 and 30, Upper Berkeley Street W1Grade II
29-31, Harcourt Street W1Grade II
29-31, Knox Street W1Grade II
29-37, York Street W1Grade II
2a, Duke Street W1Grade II
3-6, Wyndham Place W1Grade II
30, Gloucester Place W1Grade II
30, Montagu Square W1Grade II
30, York Street W1Grade II
31-33, Upper Berkeley Street W1Grade II
32-40, York Street W1Grade II
33 and 34, Montagu Square W1Grade II
34, Baker Street W1Grade II
35, Montagu Square W1Grade II
35A, GREAT CUMBERLAND PLACE W1 (See details for further address information)Grade II
36, Montagu Square W1Grade II
37-39, Montagu Square W1Grade II
37, Crawford Street W1Grade II
37, Great Cumberland Place W1Grade II
37a, Great Cumberland Place W1Grade II
38, Crawford Street W1Grade II
39 and 41, York Street W1Grade II
39, Great Cumberland Place W1Grade II
4 and 5, Montagu Place W1Grade II
4-7, Manchester Square W1Grade II
4, Duke Street W1Grade II
4, New Quebec Street W1Grade II
40, Montagu Square W1Grade II
41, Great Cumberland Place W1Grade II
41, Montagu Square W1Grade II
41, Upper Montagu Street W1Grade II
42 and 43, Montagu Square W1Grade II
42-50, Upper Montagu Street W1Grade II
42-50, York Street W1Grade II
42-70, Gloucester Place W1Grade II
43-47, Upper Montagu Street W1Grade II
43, Crawford Street W1Grade II
43, Great Cumberland Place W1Grade II
43, York Street W1Grade II
44-48, Bryanston Square W1Grade II
44, Montagu Square W1Grade II
45, Montagu Square W1Grade II
45, York Street W1Grade II
46, Blandford Street W1Grade II
46, Montagu Square W1Grade II
47 and 48, Manchester Street W1Grade II
47-49, Montagu Square W1Grade II
47-49, Upper Berkeley Street W1Grade II
47, Great Cumberland Place W1Grade II
47, York Street W1Grade II
47A, MANCHESTER STREET W1 (See details for further address information)Grade II
48, Blandford Street W1Grade II
49 and 50, Bryanston Square W1Grade II
49 and 50, Manchester Street W1Grade II
49 and 51, Upper Montagu Street W1Grade II
49, Great Cumberland Place W1Grade II
49, York Street W1Grade II
50 and 51, Montagu Square W1Grade II
50-54, Blandford Street W1Grade II
50, Upper Berkeley Street W1Grade II
51 and 52, Manchester Street W1Grade II
51-57, York Street W1Grade II
51, Great Cumberland Place W1Grade II
52-59, Montagu Square W1Grade II
52, Upper Berkeley Street W1Grade II
52, Upper Montagu Street W1Grade II
52, York Street W1Grade II
53 and 55, Great Cumberland Place W1Grade II
53-55, Dorset Street W1Grade II
53-57, Upper Montagu Street W1Grade II
53-60, Upper Berkeley Street W1Grade II
54 and 56, Great Cumberland Place W1Grade II
54-54a, York Street W1Grade II
54, Upper Montagu Street W1Grade II
56-62, Upper Montagu Street W1Grade II
57-63, Great Cumberland Place W1Grade II
58-68, Great Cumberland Place W1Grade II
6 and 8, Duke Street W1Grade II
6 and 8, Upper Montagu Street W1Grade II
6, George Street W1Grade II
6, Montagu Square W1Grade II
60, Montagu Square W1Grade II
61 and 63, Blandford Street W1Grade II
61-63, Montagu Square W1Grade II
65-83, YORK STREET W1 (See details for further address information)Grade II
65, Blandford Street W1Grade II
66-69, Upper Berkeley Street W1Grade II
67, BLANDFORD STREET (See details for further address information)Grade II
7 AND 7A, WYNDHAM PLACE W1 (See details for further address information)Grade II
7-11, Robert Adam StreetGrade II
7-11, Upper Montagu Street W1Grade II
7-12, Montagu Square W1Grade II
7, New Quebec Street W1Grade II
71-87, George Street W1Grade II
72-76, Gloucester Place W1Grade II
78-94, York Street W1Grade II
78, Chiltern StreetGrade II
8-10, Wyndham Street W1Grade II
8-11, Manchester Square W1Grade II
8, Wyndham Place W1Grade II
83-97, Gloucester Place W1Grade II
87-97, York Street W1Grade II
9 and 11, Duke Street W1Grade II
9-11, Nutford Place W1Grade II
94-104, Gloucester Place W1Grade II
94-114,118 to 124, Baker Street W1Grade II
94, CRAWFORD STREET W1 (See details for further address information)Grade II
99-111, Gloucester Place W1Grade II
Barley MowGrade II
Courtauld Institute, Eastern PartGrade II
Duke of Wellington Public HouseGrade II
Durrant's HotelGrade II
Fire StationGrade II
Fitzpatrick Family Mausoleum on East Side of the Southern Half of Public GardensGrade II
Forecourt Walls, Gate Piers and Railings to Hertford HouseGrade II
Hamilton Memorial Drinking FountainGrade II
Harcourt ArmsGrade II
Hertford HouseGrade II
K2 Telephone Kiosk Outside Flank of Number 161a Seymour PlaceGrade II
Marylebone War MemorialGrade II
Northern Part of Mostyn HotelGrade II
Presbytery to the Roman Catholic Church of St JamesGrade II
Roman Catholic Church of Our Lady of the Rosary and Attached PresbyteryGrade II
Royal Oak Public HouseGrade II
Samaritan Hospital For WomenGrade II
St Marleybone Western National SchoolGrade II
St Marylebone Library and Health CentreGrade II
Swedish ChurchGrade II
The Beehive Public HouseGrade II
The Montcalm Hotel (2 Wallenberg Place) and 42 Great Cumberland Place, with area railingsGrade II
Trinity College of MusicGrade II
Vad Ladies ClubGrade II
Walmer HouseGrade II
Water Pump at North End of Central GardenGrade II
Water Pump Set in Central Garden Opposite Number 15Grade II
West London SynagogueGrade II
Western Marble Arch Synagogue (1 Wallenberg Place and 13 Quebec Mews), 24 Great Cumberland Place and 38 Seymour Street, with area railings, and standard lanterns to 38 Seymour StreetGrade II
Westminster Council HouseGrade II
Westmoreland Arms Public HouseGrade II
William Pitt Byrne Memorial FountainGrade II
Worcester Arms Public HouseGrade II

Streets in the conservation area

Streets with listed buildings inside the boundary. Boundaries often split a street — check your exact address.

Chiltern StreetRobert Adam StreetUpper Berkeley Street

The council’s appraisal

WEBPortman Estate Conservation Area AppraisalCity of Westminster’s description of the area’s character — what planners look at when you apply.Open on council site ↗

Nearby conservation areas

Molyneux Street →Dorset Square →Stratford Place →Lisson Grove →Harley Street →Mayfair →

Boundary and listed buildings from City of Westminster and Historic England via planning.data.gov.uk (OGL). Guidance only — not an official council check.