House extensions in Westminster

Westminster received 2,447 householder applications in the last 12 months - about 47 a week. Rear extensions and dormers are the most common. Of the 1,829 decided so far, 1,609 were approved. If you're planning your own, the applications below show what people nearby applied for and how the council decided.

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Showing 50 of 709 applications
23 Oct 2026 Pending 26/07038/FULL

Development Site At 47 - 53 Queen Anne Street London W1G 9JG

Installation of a freestanding and counterweighted guardrail around the second-floor living roof.

Full Planning Permission Application Westminster
23 Oct 2026 Pending 26/01395/FULL

Flat 23 Porchester Gate 3 - 8 Bayswater Road London W2 3HW

Installation of replacement windows (Flat 23).

Full Planning Permission Application Westminster
23 Oct 2026 Pending 26/07161/LBC

51 Upper Montagu Street London W1H 1FQ

Internal alterations to include additional floor lowering within the lower ground floor WC to match the consented level of the other rooms.

Listed Building Consent Application Westminster
23 Oct 2026 Pending 26/06871/FULL

65 Cambridge Street London SW1V 4PS

Excavation of the front vaults to provide a new bathroom and small utility area and store. Addition of steps within the lobby including other associat...

Full Planning Permission Application Westminster
22 Oct 2026 Pending 26/07229/FULL

5 D'arblay Street London W1F 8DL

Alterations to the existing fixed windows to form two openable sash windows. (Linked with 26/07230/ADV)

Full Planning Permission Application Westminster
22 Oct 2026 Pending 26/07223/LBC

Paddington Station Praed Street London W2 1HB

Installation of a new louvred enclosure, with access doors, across the entrance to the under-croft area.

Listed Building Consent Application Westminster
22 Oct 2026 Pending 26/06987/FULL

Elizabeth House 23 Devonshire Street London W1G 6PG

Repair and structural strengthening of existing entrance bridges, including installation of supporting steelwork, waterproofing and reinstatement of e...

Full Planning Permission Application Westminster
22 Oct 2026 Pending 26/06100/FULL

Kingsmill 1 - 19 Kingsmill Terrace London NW8 6AA

Replacement of existing single gazed windows with like-for-like double-glazed aluminium windows.

Full Planning Permission Application Westminster
21 Oct 2026 Pending 26/06746/FULL

Top Floor 70 - 71 Wells Street London W1T 3QE

Conversion of existing roof void to office/meeting room, installation of roof terrace with balustrade, erection of external staircase, and associated ...

Full Planning Permission Application Westminster
21 Oct 2026 Pending 26/07202/LBC

Basement East And Ground Floor And First Floor 33 Weymouth Street London W1G 7BY

Replacement of 13 doorsets with fire doors.

Listed Building Consent Application Westminster
21 Oct 2026 Pending 26/07199/LBC

49 Queen's Gardens London W2 3AA

Erection of a mansard roof extension incorporating rooflights and a rear balcony; installation of Juliet balconies at ground and first floor levels to...

Listed Building Consent Application Westminster
21 Oct 2026 Pending 26/07198/FULL

49 Queen's Gardens London W2 3AA

Erection of a mansard roof extension incorporating rooflights and a rear balcony; installation of Juliet balconies at ground and first floor levels to...

Full Planning Permission Application Westminster
21 Oct 2026 Pending 26/07192/LBC

119 Warwick Way London SW1V 4HS

Conversion and internal alterations to the ground floor flat (Retrospective)

Listed Building Consent Application Westminster
21 Oct 2026 Pending 26/07191/LBC

6 Wilton Place London SW1X 8RH

Layout alterations and replacement of internal doors.

Listed Building Consent Application Westminster
21 Oct 2026 Pending 26/07187/FULL

Ground Floor Flat 151 Portnall Road London W9 3BN

Erection of a single storey rear extension.

Full Planning Permission Application Westminster
21 Oct 2026 Pending 26/06768/FULL

21 Errington Road London W9 3LF

Erection of a new pedestrian gate and two brick piers in the existing boundary to Fernhead Road, on land at the rear of 21 Errington Road (freehold ti...

Full Planning Permission Application Westminster
21 Oct 2026 Pending 26/06218/FULL

Flat 1 Claremont Court 29 Enford Street London W1H 1DJ

Installation of a conservatory (Retrospective)

Full Planning Permission Application Westminster
21 Oct 2026 Pending 26/07131/LBC

52 Eaton Place London SW1X 8AL

Replacement of the approved second-floor rear sash window with painted timber French doors. (Linked with 26/05674/NMA)

Listed Building Consent Application Westminster
21 Oct 2026 Pending 26/06995/FULL

25 Devonshire Street London W1G 6PQ

Alterations to shopfront design including new awning and ventilation grilles; repair and replacement of lower ground ventilation in the form of luxcre...

Full Planning Permission Application Westminster
21 Oct 2026 Pending 26/05554/FULL

4 Sunderland Terrace London W2 5PA

Rebuilding of existing front garden wall, gate post/pillar and raised planter.

Full Planning Permission Application Westminster
20 Oct 2026 Pending 26/07201/FULL

30 Westmoreland Terrace London SW1V 4AL

Replacement timber double glazed rear door.

Full Planning Permission Application Westminster
20 Oct 2026 Pending 26/06293/FULL

129D St George's Drive London SW1V 4DA

Replacement of five existing single-glazed timber sliding sash windows (three to the front elevation, two to the rear) with new hardwood (Accoya) vert...

Full Planning Permission Application Westminster
20 Oct 2026 Pending 26/07174/LBC

70 Whitehall London SW1A 2AS

Replacement of the existing security pods and doors with upgraded security pods and doors, together with upgrading of the existing security desk in a ...

Listed Building Consent Application Westminster
20 Oct 2026 Pending 26/07155/LBC

Flat 1 25 North Audley Street London W1K 6WS

Internal alterations including revisions to internal lighting arrangements, alterations to an existing cupboard, and comfort cooling system comprising...

Listed Building Consent Application Westminster
20 Oct 2026 Pending 26/06324/FULL

2C Sunderland Terrace London W2 5PA

Amalgamation of flats B and C and replacement of first floor front and rear windows with timber double glazing.

Full Planning Permission Application Westminster
20 Oct 2026 Pending 26/07166/FULL

3A Melina Place London NW8 9SA

Excavation of a basement; alterations to flat roof; green roof; installation of rooflights; construction of an extension at first floor level, changes...

Full Planning Permission Application Westminster
20 Oct 2026 Pending 26/07165/LBC

21 Norfolk Road London NW8 6HG

Installation of an internal lift.

Listed Building Consent Application Westminster
20 Oct 2026 Pending 26/06182/FULL

50 Queensway London W2 3RY

Erection of a rear ground-floor extension.

Full Planning Permission Application Westminster
20 Oct 2026 Pending 26/06721/LBC

48 Westminster Palace Gardens Artillery Row SW1P 1RR

Replacement of balcony door and internal alterations to replace cornices. (linked with 26/06720/FULL)

Listed Building Consent Application Westminster
20 Oct 2026 Pending 26/06720/FULL

48 Westminster Palace Gardens Artillery Row SW1P 1RR

Replacement of balcony door and internal alterations to replace cornices. (Linked with 26/06721/LBC)

Full Planning Permission Application Westminster
20 Oct 2026 Pending 26/05457/LBC

Flat 3 7 New Quebec Street London W1H 7RH

Internal refurbishment and new boiler flue to rear elevation.

Listed Building Consent Application Westminster
19 Oct 2026 Pending 26/07147/LBC

35 Belgrave Square London SW1X 8QB

Internal alterations to the previously approved schemes under planning permission (RN 20/03405/FULL) and listed building consent (RN 20/03406/LBC)

Listed Building Consent Application Westminster
19 Oct 2026 Pending 26/05531/LBC

Second Floor 31 Gloucester Place London W1U 6HT

Erection of safety railings to raised patio area accessible from existing french doors of second floor flat. (Retrospective) (Linked to 26/05530/FULL)

Listed Building Consent Application Westminster
19 Oct 2026 Pending 26/05530/FULL

Second Floor 31 Gloucester Place London W1U 6HT

Erection of safety railings to raised patio area accessible from existing french doors of second floor flat. (Retrospective) (Linked to 26/05531/LBC)

Full Planning Permission Application Westminster
19 Oct 2026 Pending 26/07139/FULL

9 Maunsel Street London SW1P 2QL

Erection of a single storey rear extension at ground floor level.

Full Planning Permission Application Westminster
19 Oct 2026 Pending 26/07064/FULL

London School Of Economics & Political Science Houghton Street London WC2A 2AE

Replacement Windows, Louvres and Doors to Houghton Street and Clare Market.

Full Planning Permission Application Westminster
19 Oct 2026 Pending 26/07065/FULL

77 Great Peter Street London SW1P 2EZ

Proposed replacement of the front door, removal of the sign above front entrance, installation of a new air source heat pump to rear first floor roof,...

Full Planning Permission Application Westminster
19 Oct 2026 Pending 26/07122/LBC

Apartment 4 83 Lancaster Gate London W2 3NN

Internal alterations and refurbishment.

Listed Building Consent Application Westminster
19 Oct 2026 Pending 26/07004/FULL

16D Randolph Crescent London W9 1DR

Replacement of single glazed timber windows and French doors to the front and rear elevations of the raised ground floor flat with painted timber wind...

Full Planning Permission Application Westminster
19 Oct 2026 Pending 26/07078/LBC

39 Wellington Street London WC2E 7BB

External alterations to windows and doors, installation of roof-level plant and associated screening, followed by internal alterations and refurbishme...

Listed Building Consent Application Westminster
19 Oct 2026 Pending 26/07077/FULL

39 Wellington Street London WC2E 7BB

External alterations to windows and doors, installation of roof-level plant and associated screening, followed by internal alterations and refurbishme...

Full Planning Permission Application Westminster
19 Oct 2026 Pending 26/06292/FULL

11 - 14 Northumberland Avenue London WC2N 5AQ

Replacment of existing door and frame and replacing with matching double doors to match existing colour.

Full Planning Permission Application Westminster
19 Oct 2026 Pending 26/06428/FULL

17 Cropthorne Court 20 - 28 Maida Vale London W9 1TA

Duct penetrations and external ventilation terminals to the rear elevation, in association with the internal alterations and refurbishment of 17 Cropt...

Full Planning Permission Application Westminster
19 Oct 2026 Pending 26/06138/LBC

17 Cropthorne Court 20 - 28 Maida Vale London W9 1TA

Internal alterations and refurbishment and duct penetrations and external ventilation terminals to the rear elevation of 17 Cropthorne Court (Linked t...

Listed Building Consent Application Westminster
16 Oct 2026 Pending 26/07117/LBC

5 Harcourt Street London W1H 4HA

Reinstatement of the front basement lightwell (including removal of the existing concrete slab, traditional London mosaic tiling, metal railings/gate ...

Listed Building Consent Application Westminster
16 Oct 2026 Pending 26/07116/FULL

5 Harcourt Street London W1H 4HA

Reinstatement of the front basement lightwell (including removal of the existing concrete slab, traditional London mosaic tiling, metal railings/gate ...

Full Planning Permission Application Westminster
16 Oct 2026 Pending 26/07114/LBC

1 Chiltern Street London W1U 7PA

Minor internal alterations

Listed Building Consent Application Westminster
16 Oct 2026 Pending 26/07106/LBC

Vigo House 115 Regent Street London W1S 3HT

Internal alterations at ground floor level.

Listed Building Consent Application Westminster
16 Oct 2026 Pending 26/07102/LBC

3 Neal Street London WC2H 9QL

Repairs to the existing flat roof at 3 to 7 Neal Street. (Linked with 26/07101/FULL)

Listed Building Consent Application Westminster
16 Oct 2026 Pending 26/07094/FULL

40 Wellington Road London NW8 9TJ

Installation of two external caged access ladders, a roof walkway and edge protection barriers.

Full Planning Permission Application Westminster
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Frequently asked questions

When do you need planning permission for a house extension?
Single-storey rear extensions up to 4m (detached) or 3m (semi-detached / terraced) are usually permitted development. Two-storey extensions, anything in a conservation area, or larger projects almost always need a planning application.
What's the difference between planning permission and permitted development?
Permitted development rights let you build certain things without applying for planning permission, subject to specified limits. Anything outside those limits, whether taller, larger or in a protected area, needs full planning permission.
How long does a householder application take?
The statutory target is 8 weeks from validation. Most simple householder extensions are decided within that window; complex or contested cases, especially those drawing a lot of comments, can take longer.
Can I get email alerts for new extensions applications in Westminster?
Yes. Click "Set up alerts" on this page and you'll get a daily or weekly email listing every new extensions application published by Westminster. You can also narrow the alert to a postcode, street, or drawn area.

We check Westminster's planning portal daily. New extensions applications appear here within a day of being published.