House extensions in Lambeth

Lambeth received 1,220 householder applications in the last 12 months - about 23 a week. Rear extensions and dormers are the most common. Of the 891 decided so far, 718 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 358 applications
Yesterday Awaiting decision 26/02950/LDCP

82 Mayall Road London SE24 0PJ

Application for a Certificate of Lawful Development (Proposed) with respect to erection of a roof extension to rear outrigger.

Certificate of Lawful Use proposed Lambeth
22 Oct 2026 Awaiting decision 26/02989/FUL

85 Clapham Manor Street London Lambeth SW4 6DR

Erection of a single-storey rear infill extension, reinstatement of front boundary railings and gates, replacement sash windows, and associated extern...

Full Planning Permission Lambeth
22 Oct 2026 Awaiting decision 26/02889/FUL

120 Endymion Road London Lambeth SW2 2BP

Installation of timber sash window to side elvation and conversion of the existing garage into a habitable bedroom.

Full Planning Permission Lambeth
22 Oct 2026 Awaiting decision 26/02990/FUL

85 Clapham Manor Street London Lambeth SW4 6DR

Construction of a mansard-roof extension to provide additional residential accommodation.

Full Planning Permission Lambeth
21 Oct 2026 Awaiting decision 26/03089/FUL

Nevil House Minet Road London Lambeth SW9 7TW

Fire remediation works of the existing external facade including re-cladding of all elevations replacing all combustible materials from the facade and...

Full Planning Permission Lambeth
21 Oct 2026 Awaiting decision 26/03090/FUL

Secker House Minet Road London Lambeth SW9 7TP

Fire remediation works of the existing external facade including re-cladding of all elevations replacing all combustible materials from the facade and...

Full Planning Permission Lambeth
21 Oct 2026 Awaiting decision 26/02988/FUL

76 Bonham Road London Lambeth SW2 5HG

Change of use of the ground floor to self contained unit (class C3), upper floors and loft to a large House in Multiple Occupation (Sui Generis), toge...

Full Planning Permission Lambeth
21 Oct 2026 Awaiting decision 26/02890/FUL

45 Kempshott Road London Lambeth SW16 5LJ

Erection of a ground floor rear infill extension, installation of a new bay window to front elevation and replacement of the existing uPVC windows wit...

Full Planning Permission Lambeth
20 Oct 2026 Awaiting decision 26/03096/FUL

11 Josephine Avenue London SW2 2JU

Replacement of existing windows with double glazed timber framed windows.

Full Planning Permission Lambeth
20 Oct 2026 Awaiting decision 26/03076/FUL

First Floor Flat 8 Corrance Road London SW2 5RH

Replacement of the existing timber windows to the front elevation with double-glazed uPVC sash windows.

Full Planning Permission Lambeth
20 Oct 2026 Awaiting decision 26/03075/LDCP

38 Gubyon Avenue London SE24 0DX

Certificate of Lawful Development (Proposed) with respect to erection of a single storey ground floor rear and rear side infill extensions - Retrospec...

Certificate of Lawful Use proposed Lambeth
20 Oct 2026 Awaiting decision 26/03074/LDCP

38 Gubyon Avenue London SE24 0DX

Certificate of Lawful Development (Proposed) with respect to erection a rear dormer roof extension - Retrospective.

Certificate of Lawful Use proposed Lambeth
20 Oct 2026 Awaiting decision 26/03073/FUL

10 Claverdale Road London SW2 2DP

Erection of a single storey ground floor rear side infill extension. Erection of a rear dormer roof extension with juliet balcony and installation of ...

Full Planning Permission Lambeth
20 Oct 2026 Awaiting decision 26/02742/FUL

47 Carson Road London SE21 8HT

Formation of a vehicular crossover and dropped kerb with associated works.

Full Planning Permission Lambeth
19 Oct 2026 Awaiting decision 26/03061/LDCP

40 Ebbisham Drive London SW8 1UB

Application for a Certificate of Lawful Development (Proposed) with respect to erection of a ground floor rear extension, together with the replacemen...

Certificate of Lawful Use proposed Lambeth
19 Oct 2026 Awaiting decision 26/02907/FUL

28 Streatham Common North London SW16 3HP

Erection of a 2-storey side extension and a 2-storey rear infill extension to enlarge the existing 5 flats, together with replacement of existing wind...

Full Planning Permission Lambeth
19 Oct 2026 Awaiting decision 26/02922/FUL

47 Clive Road London SE21 8DA

Erection of a single storey ground floor rear and side infill extensions.

Full Planning Permission Lambeth
16 Oct 2026 Awaiting decision 26/02808/FUL

31 Ground Floor Part Flat Cautley Avenue London Lambeth SW4 9HX

Erection of a ground floor single storey rear extension.

Full Planning Permission Lambeth
16 Oct 2026 Awaiting decision 26/02726/FUL

108 Weir Road London Lambeth SW12 0ND

Erection of a rear dormer roof extension with juliet balcony and 2x solar panels, the installation of 1x rooflight to front roofslope.

Full Planning Permission Lambeth
16 Oct 2026 Awaiting decision 26/02899/FUL

27 Northanger Road London SW16 5RX

Erection of 2 x rear dormer window extensions and installation of 3 rooflights to the front roof slope - Flat B.

Full Planning Permission Lambeth
15 Oct 2026 Awaiting decision 26/02880/FUL

262 Office Knight's Hill London Lambeth SE27 0QP

Change of use of the ground and lower ground floors of Block C from office (Use Class E(g)) to a 3-bedroom dwellinghouse (Use Class C3). External alte...

Full Planning Permission Lambeth
15 Oct 2026 Awaiting decision 26/03019/LDCP

38 Tooting Bec Gardens London SW16 1QZ

Certificate of Lawful Development (Proposed) with respect to fenestration alteration including the structural opening with the insertion of 2x timber ...

Certificate of Lawful Use proposed Lambeth
15 Oct 2026 Awaiting decision 26/03040/FUL

3 Walberswick Street London Lambeth SW8 1XF

Erection of a second-storey rear extension and the addition of a window to the mansard. Reduction from a double sliding door to a single door with a J...

Full Planning Permission Lambeth
15 Oct 2026 Awaiting decision 26/02197/FUL

53 Cambray Road London SW12 0DX

Erection of a single storey ground floor rear and side extension and associated alterations.

Full Planning Permission Lambeth
14 Oct 2026 Awaiting decision 26/03004/FUL

61 Amesbury Avenue London Lambeth SW2 3AE

Erection of a single storey rear infill extension, replacement of the existing timber sash windows with double glazed timber sash windows, erection of...

Full Planning Permission Lambeth
14 Oct 2026 Awaiting decision 26/02502/LB

49 Courtenay Street London SE11 5PH

Replacement of flat roof covering and roof light.

Listed Building Consent Lambeth
14 Oct 2026 Awaiting decision 26/02859/FUL

51 Copley Park London Lambeth SW16 3DB

Erection of a single storey side extension, replacement of the existing timber fence with shorter fence and installation of gate to the front of the p...

Full Planning Permission Lambeth
14 Oct 2026 Awaiting decision 26/02651/FUL

4A Templar Street London Lambeth SE5 9JB

Erection of outbuilding in rear garden. (Part Retrospective)

Full Planning Permission Lambeth
14 Oct 2026 Awaiting decision 26/02838/LB

14 Aquinas Street London SE1 8AE

External works include replacement of existing non original rear doors to garden with timber framed door. Replacement of existing windows with double ...

Listed Building Consent Lambeth
14 Oct 2026 Awaiting decision 26/02837/FUL

14 Aquinas Street London SE1 8AE

Replacement of existing non original rear doors to garden with timber framed door. Replacement of existing windows with double glazed timber windows a...

Full Planning Permission Lambeth
13 Oct 2026 Awaiting decision 26/03013/FUL

21 Rosendale Road London SE21 8DS

Removal of the rear extension and bay window and erection of a single storey ground floor rear extension with the replacement of a side window to Flat...

Full Planning Permission Lambeth
13 Oct 2026 Awaiting decision 26/02992/FUL

40 Cedarville Gardens London SW16 3DA

Erection of single-storey side and rear extensions, including conversion and extension of the existing garage; erection of side and rear dormer roof e...

Full Planning Permission Lambeth
13 Oct 2026 Awaiting decision 26/03003/LB

25 Durand Gardens London SW9 0PS

Internal repairs and reinstatement works, including decorative plasterworks, wall and ceilings finishes, timber flooring, internal joinery, windows, d...

Listed Building Consent Lambeth
13 Oct 2026 Awaiting decision 26/02987/LDCP

64 Edithna Street London SW9 9JP

Application for a Certificate of Lawful Development (Proposed) with respect to the erection of a rear roof extension.

Certificate of Lawful Use proposed Lambeth
13 Oct 2026 Awaiting decision 26/02796/FUL

12 Burnley Road London SW9 0SH

Increasing footprint of the front and rear lightwells with new flower bed to the front and new steps to garden level; the replacement of the rear lowe...

Full Planning Permission Lambeth
13 Oct 2026 Awaiting decision 26/02996/FUL

Surrey County Cricket Club Kennington Oval London Lambeth SE11 5SS

Extension of the existing external balcony on third floor pitch-facing elevation and installation of minor additional plant at roof level.

Full Planning Permission Lambeth
13 Oct 2026 Awaiting decision 26/03001/FUL

80 Park Hill London SW4 9PB

Erection of a single-storey ground floor rear and infill extension including the installation of two rooflights (ground floor flat).

Full Planning Permission Lambeth
13 Oct 2026 Awaiting decision 26/02818/LB

212 Camberwell New Road London Lambeth SE5 0RR

Replacement of the existing rear communal garden double doors with new Timber single glazed double doors. (The reference number for this Listed Buildi...

Listed Building Consent Lambeth
13 Oct 2026 Awaiting decision 26/02817/FUL

212 Camberwell New Road London Lambeth SE5 0RR

Replacement of the existing rear communal garden double doors with new Timber single glazed double doors. (The reference number for this Full Planning...

Full Planning Permission Lambeth
12 Oct 2026 Awaiting decision 26/02966/FUL

8 Claverdale Road London Lambeth SW2 2DP

Erection of an L shaped rear dormer and the addition of threerooflights to the front.

Full Planning Permission Lambeth
12 Oct 2026 Awaiting decision 26/02978/FUL

51 Hydethorpe Road London Lambeth SW12 0JE

Erection of a roof extension over the existing rear outrigger.

Full Planning Permission Lambeth
12 Oct 2026 Awaiting decision 26/02965/FUL

8 Claverdale Road London SW2 2DP

Erection of single storey ground floor rear infill extension with four rooflights and mono-pitched roof, and alteration of the existing rear timber fr...

Full Planning Permission Lambeth
12 Oct 2026 Awaiting decision 26/03024/FUL

70 Hepworth Road London SW16 5DQ

Erection of a single-storey ground-floor extension and the installation of bifold doors.

Full Planning Permission Lambeth
12 Oct 2026 Awaiting decision 26/03023/LDCP

70 Hepworth Road London SW16 5DQ

Application for a Certificate of Lawful Certificate (Proposed) for the erection of a rear dormer extension including two rooflights to the front and t...

Certificate of Lawful Use proposed Lambeth
12 Oct 2026 Awaiting decision 26/02642/LDCP

129 Cricklade Avenue London Lambeth SW2 3HF

Certificate of Lawful development (proposed) with respect to erection of hip to gable roof extension and rear dormer extension.

Certificate of Lawful Use proposed Lambeth
11 Oct 2026 Awaiting decision 26/02625/FUL

88 Dumbarton Road London Lambeth SW2 5LU

Replacement of the ground-floor rear window with a white uPVC double glazed french doors to the Ground Floor Flat.

Full Planning Permission Lambeth
9 Oct 2026 Awaiting decision 26/02960/FUL

20 Liston Road London SW4 0DF

Replacement of existing door leading to the terrace (First And Second Floor Flat) - Retrospective

Full Planning Permission Lambeth
9 Oct 2026 Awaiting decision 26/02958/FUL

15 Fitzwilliam Road London SW4 0DW

Erection of a single storey lower ground floor infill extension with the installation of a pergola and the replacement of existing conservatory at gro...

Full Planning Permission Lambeth
9 Oct 2026 Awaiting decision 26/02953/LDCP

47 Edgeley Road London SW4 6ES

Application for a Certificate of Lawful Development (Proposed) with respect to erection of an L-shaped dormer roof extension and all associated works.

Certificate of Lawful Use proposed Lambeth
9 Oct 2026 Awaiting decision 26/02951/FUL

1 - 3 Whittlesey Street London SE1 8SZ

Proposed single-storey ground floor rear extension with bi-fold doors and double glazed glass, and alteration of garage door to front elevation with o...

Full Planning Permission Lambeth
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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 Lambeth?
Yes. Click "Set up alerts" on this page and you'll get a daily or weekly email listing every new extensions application published by Lambeth. You can also narrow the alert to a postcode, street, or drawn area.

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