House extensions in Westminster

Westminster received 1,442 householder applications in the last 12 months - about 28 a week. Rear extensions and dormers are the most common. Of the 952 decided so far, 831 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 622 applications
Yesterday Pending 26/06029/LBC

81 South Audley Street London W1K 1JJ

Alterations to roof including reinstatement of roof profile, new roof light, installation of two air source heat pumps; replacement windows and conver...

Listed Building Consent Application Westminster
Yesterday Pending 26/06028/FULL

81 South Audley Street London W1K 1JJ

Alterations to roof including reinstatement of roof profile, new roof light, installation of two air source heat pumps; replacement windows and conver...

Full Planning Permission Application Westminster
2 days ago Pending 26/05852/LBC

66 Chepstow Road London W2 5BE

Replacement of front and rear windows with vacuum glazing and slightly narrower glazing bars; replacement of front and basement access doors with new ...

Listed Building Consent Application Westminster
2 days ago Pending 26/05980/FULL

29 Gloucester Street London SW1V 2DB

Replacement of existing single glazed timber framed sash and casement windows to front elevation with double glazed timber framed sash and casement wi...

Full Planning Permission Application Westminster
2 days ago Pending 26/06020/LBC

Radiant House 36 - 38 Mortimer Street London W1W 7RG

Removal of two external steel escape platforms at 3rd and 4th floor levels to rear elevation, forming new protected escape route at second floor and a...

Listed Building Consent Application Westminster
2 days ago Pending 26/06175/FULL

66 Chepstow Road London W2 5BE

Replacement of front and rear windows with vacuum glazing and slightly narrower glazing bars; replacement of front and basement access doors with new ...

Full Planning Permission Application Westminster
2 days ago Pending 26/05984/FULL

41 Sutherland Street London SW1V 4JX

Replacement of front, side and rear windows with double glazed timber framed sash windows; Replacement of a door with a double glazed timber framed do...

Full Planning Permission Application Westminster
2 days ago Pending 26/05976/FULL

73 Sutherland Street London SW1V 4JY

Replacement of front and rear windows with double glazed timber framed sash windows; replacement of a door with a double glazed timber framed door; an...

Full Planning Permission Application Westminster
2 days ago Pending 26/05979/FULL

128 Warwick Way London SW1V 4JA

Replacement of front and rear windows with double glazed timber framed sash and casement windows; replacement of a door with a double glazed timber fr...

Full Planning Permission Application Westminster
2 days ago Pending 26/05978/FULL

4 Sussex Street London SW1V 4RS

Replacement of existing single glazed timber framed sash windows to front and side elevations with double glazed timber framed sash windows. Replaceme...

Full Planning Permission Application Westminster
2 days ago Pending 26/05891/LBC

Flat 1 109 Eaton Square London SW1W 9AA

Installation of external AC condenser units and plant within the existing under-pavement vaults to the front of the property at lower ground floor lev...

Listed Building Consent Application Westminster
8 Sept 2026 Pending 26/05917/FULL

Flat 5 36 Nottingham Place London W1U 5NT

Replacing existing windows with new windows

Full Planning Permission Application Westminster
8 Sept 2026 Pending 26/05967/LBC

Fourth Floor 2 Cavendish Square London W1G 0PU

Installation of internal secondary glazing to the 4th-floor windows, with internal reversible, non-destructive fixings into the window reveals, and sl...

Listed Building Consent Application Westminster
8 Sept 2026 Pending 26/05900/FULL

68 Edgware Road London W2 2EG

Installation of an access hatch window within an existing door to the sites rear elevation fronting Stourcliffe Street to facilitate takeaway collecti...

Full Planning Permission Application Westminster
7 Sept 2026 Pending 26/05960/FULL

12 Golden Square London W1F 9JE

Replacement of a louvre to a window at fifth floor level.

Full Planning Permission Application Westminster
7 Sept 2026 Pending 26/05800/FULL

116 Alderney Street London SW1V 4HA

Erection of a two storey rear extensions at lower ground and ground floor levels.

Full Planning Permission Application Westminster
7 Sept 2026 Pending 26/05923/LBC

Flat 3 54 Montagu Square London W1H 2LP

Internal layout alterations and associated works.

Listed Building Consent Application Westminster
7 Sept 2026 Pending 26/05818/FULL

Flat 3 32 Fordingley Road London W9 3HF

Erection of rear dormer extension to top-floor flat and installation of rooflights to front roof slope.

Full Planning Permission Application Westminster
4 Sept 2026 Pending 26/05833/FULL

4 Buckingham Mews London SW1E 6NR

Erection of a mansard roof extension.

Full Planning Permission Application Westminster
4 Sept 2026 Pending 26/05925/FULL

37 Artesian Road London W2 5DA

Replacement and enlargement of existing rooflight, replacement and alteration of existing windows and door, alteration to raised brick planter.

Full Planning Permission Application Westminster
4 Sept 2026 Pending 26/05255/FULL

16 Carlisle Street London W1D 3BT

Replacement of existing windows and front entrance door with double-glazed hardwood box sash windows and door; installation of new door surround; repa...

Full Planning Permission Application Westminster
4 Sept 2026 Pending 26/05625/FULL

5 Chesterfield Hill London W1J 5BL

Replacement of an existing first floor rear window with a pair of French doors within the existing opening; and installation of external air condition...

Full Planning Permission Application Westminster
4 Sept 2026 Pending 26/05932/LBC

Flat 23 Parkside Knightsbridge London SW1X 7JW

Replacement of existing single-glazed windows and balcony doors with double-glazed windows and doors. (Linked with 26/05933/FULL)

Listed Building Consent Application Westminster
4 Sept 2026 Pending 26/05933/FULL

Flat 23 Parkside Knightsbridge London SW1X 7JW

Replacement of existing single-glazed windows and balcony doors with double-glazed windows and doors. (Linked with 26/05932/LBC)

Full Planning Permission Application Westminster
3 Sept 2026 Pending 26/06015/FULL

129 Saltram Crescent London W9 3JT

Erection of a two-storey extension at rear elevation.

Full Planning Permission Application Westminster
3 Sept 2026 Pending 26/06021/LBC

33 Glasshouse Street London W1B 5DG

Alterations to part of the ground and basement levels in connection with improvements to the end-of-trip facilities, including the infilling of existi...

Listed Building Consent Application Westminster
3 Sept 2026 Pending 26/06035/CLOPUD

30 Ashworth Road W9 1JY

Erection of new garden retaining wall and erection of new garden timber fence to match the height of existing fence.

Westminster
3 Sept 2026 Pending 26/06030/FULL

Flat 1 280 Elgin Avenue London W9 1JR

Erection of Garden Room in rear garden of Lower Ground Floor Flat.

Full Planning Permission Application Westminster
3 Sept 2026 Pending 26/06045/PALHE

9 Abinger Mews W9 3SP

Erection of a single storey rear extension to existing mid-terraced property.

Prior approval larger home extenstion Westminster
2 Sept 2026 Pending 26/05993/FULL

4 Grosvenor Square London W1K 4AE

Limited work to maintaining and repairing the roof; building facade and enhancing the accessibility of the entrance. (Linked to 26/05994/LBC)

Full Planning Permission Application Westminster
2 Sept 2026 Pending 26/05994/LBC

4 Grosvenor Square London W1K 4AE

Limited work to maintaining and repairing the roof; building facade and enhancing the accessibility of the entrance. (Linked to 26/05993/FULL)

Listed Building Consent Application Westminster
2 Sept 2026 Pending 26/06006/FULL

Flat 3 66 Hamilton Terrace London NW8 9UJ

Erection of a single storey rear extension at ground floor level; replacement of existing rear extension window with a door; installation of windows t...

Full Planning Permission Application Westminster
2 Sept 2026 Pending 26/05992/FULL

12A Norfolk Road London NW8 6HE

Rebuilding of damaged non-original front boundary wall. (Like-for-like)

Full Planning Permission Application Westminster
2 Sept 2026 Pending 26/05275/FULL

16 Bryanston Street London W1H 7EF

Installation of louvres to front elevation. (Site include 1-9 Seymour Street)

Full Planning Permission Application Westminster
2 Sept 2026 Pending 26/05985/LBC

100 Piccadilly London W1J 7NH

Facade cleaning and repairs.

Listed Building Consent Application Westminster
2 Sept 2026 Pending 26/05747/LBC

Ground Floor To First Floor 52 Hereford Road London W2 5AJ

Repair works to the first floor balcony. (Linked with 26/05746/FULL)

Listed Building Consent Application Westminster
2 Sept 2026 Pending 26/05746/FULL

Ground Floor To First Floor 52 Hereford Road London W2 5AJ

Repair works to the first floor balcony. (Linked with 26/05747/LBC)

Full Planning Permission Application Westminster
1 Sept 2026 Pending 26/05254/FULL

1 Vincent Square London SW1P 2PN

Alterations to the external façades and roof of the building, including the installation of faux stone surrounds to windows and Juliet balconies, revi...

Full Planning Permission Application Westminster
1 Sept 2026 Pending 26/05968/LBC

33 Grosvenor Street London W1K 4QU

Replacement of fire doors.

Listed Building Consent Application Westminster
1 Sept 2026 Pending 26/05963/FULL

88 - 92 Baker Street London W1U 8TQ

Replacement of principal entrance door. (like-for-like)

Full Planning Permission Application Westminster
1 Sept 2026 Pending 26/05974/LBC

41 Devonshire Place London W1G 6JY

Reinstatement of metal access stair within the lightwell of the townhouse and the new metal access stair within the lightwell to the lower ground floo...

Listed Building Consent Application Westminster
1 Sept 2026 Pending 26/05973/FULL

41 Devonshire Place London W1G 6JY

Reinstatement of metal access stair within the lightwell of the townhouse and the new metal access stair within the lightwell to the lower ground floo...

Full Planning Permission Application Westminster
1 Sept 2026 Pending 26/05938/FULL

24 Vincent Square London SW1P 2NJ

Subdivision of existing residential property to create two self-contained 3-bedroom family homes, along with cycle parking and associated external alt...

Full Planning Permission Application Westminster
1 Sept 2026 Pending 26/05480/FULL

9 Arncliffe 22 Greville Place London NW6 5JG

Replacement of single glazed crittal windows and patio door with double glazed crittal windows in the south east facade.

Full Planning Permission Application Westminster
1 Sept 2026 Pending 26/05971/LBC

House Of Commons Palace Of Westminster Parliament Square London SW1A 0AA

Automation of door at principal floor level.

Listed Building Consent Application Westminster
28 Aug 2026 Pending 26/05602/LBC

Flat 6 39 Wimpole Street London W1G 8YE

Replacement of a painted timber roof top roof light to match existing. (Linked with 26/05899/FULL)

Listed Building Consent Application Westminster
28 Aug 2026 Pending 26/05639/FULL

31 Oldbury Place London W1U 5PS

Alterations of the roof to include three dormer windows.

Full Planning Permission Application Westminster
28 Aug 2026 Pending 26/05911/LBC

74 Eaton Place London SW1X 8AU

Internal waterproofing works to damp-affected basement walls including removal of existing damaged plaster finishes and replacement with a specialist ...

Listed Building Consent Application Westminster
28 Aug 2026 Pending 26/05914/FULL

66 - 68 Brewer Street London W1F 9TP

Installation of a retractable awning/canopy above the existing Brewer Street doorway. (NB: Venue NAME on canopy, subject to separate advert applicatio...

Full Planning Permission Application Westminster
28 Aug 2026 Pending 26/05899/FULL

Flat 6 39 Wimpole Street London W1G 8YE

Installation of a replacement timber rooflight at main roof level. (Linked with 26/05602/LBC)

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.