House extensions in Lambeth

Lambeth received 800 householder applications in the last 12 months - about 15 a week. Rear extensions and dormers are the most common. Of the 566 decided so far, 456 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 269 applications
7 Sept 2026 Pending 26/01893/FUL

25A Clyston Street London Lambeth SW8 4TT

Erection of a rear mansard roof extension and the installation of two front roof lights.

Full Planning Permission Lambeth
4 Sept 2026 Awaiting decision 26/02493/LDCP

40 Strathleven Road London SW2 5LA

Application for a Certificate of Lawful Development (Proposed) with respect to the erection of a full-width rear dormer roof extension, installation o...

Certificate of Lawful Use proposed Lambeth
3 Sept 2026 Awaiting decision 26/02234/FUL

4 Dorchester Drive London SE24 0DQ

Erection of a part hip-to-gable roof extension and a rear dormer roof extension incorporating a stepped ridge, together with the installation of roofl...

Full Planning Permission Lambeth
2 Sept 2026 Awaiting decision 26/02514/FUL

19 St Stephen's Terrace London Lambeth SW8 1DJ

Replacement of single glazed timber framed windows to double glazed timer frame windows.

Full Planning Permission Lambeth
2 Sept 2026 Awaiting decision 26/02524/LDCP

25 Hitherfield Road London SW16 2LW

Certificate of Lawful Development (Proposed) with respect to the erection of a single storey ground floor rear extension.

Certificate of Lawful Use proposed Lambeth
1 Sept 2026 Awaiting decision 26/02501/LDCP

103 Casewick Road London SE27 0TA

Certificate of Lawful Development (Proposed) with respect to the loft conversion including the installation of three roof lights to the front roof slo...

Certificate of Lawful Use proposed Lambeth
1 Sept 2026 Pending 26/02500/FUL

85 Stockwell Park Road London SW9 0DB

Demolition of the rear extension and erection of a single storey ground floor rear and side wraparound extension and a side extension at first floor l...

Full Planning Permission Lambeth
31 Aug 2026 Awaiting decision 26/02496/LB

123A 123B 123C And 121C Stamford St London SE1 9NN

Listed Building Consent and Full Planning Permission for the reinstatement and retention of the original separate layouts of Flat 121C and Flat 123A, ...

Listed Building Consent Lambeth
31 Aug 2026 Pending 26/02497/PDE

8 Trouville Road London SW4 8QL

Prior approval for the erection of a single storey rear extension at lower ground floor with dimensions of 4.00m (length), 3.20m (total maximum height...

Householders Extensions Prior Approval Lambeth
27 Aug 2026 Awaiting decision 26/02473/PDE

60 Conyers Road London Lambeth SW16 6LT

Application for prior approval for the erection of a single storey ground floor rear extension with dimensions of 5.10m (length), 4.00m (total maximum...

Householders Extensions Prior Approval Lambeth
26 Aug 2026 Pending 26/02466/FUL

30 Chatsworth Way London SE27 9HN

Erection of a single-storey ground-floor rear extension, together with façade alterations, replacement windows, installation of rooflights and associa...

Full Planning Permission Lambeth
26 Aug 2026 Awaiting decision 26/02005/FUL

7 Thurlow Park Road London Lambeth SE21 8JB

Conversion of existing house to create 5no. self-contained flats together with the erection of single storey rear and 2-storey side extension and repl...

Full Planning Permission Lambeth
24 Aug 2026 Pending 26/02430/FUL

33 Bellefields Road London SW9 9UH

Erection of a single-storey ground floor rear wrap-around extension, including a balcony at upper ground floor level.

Full Planning Permission Lambeth
24 Aug 2026 Pending 26/02119/FUL

16 Cambray Road London SW12 0DY

Erection of a single storey ground floor side infill extension, together with erection of a rear mansard roof extension including the installation of ...

Full Planning Permission Lambeth
21 Aug 2026 Awaiting decision 26/01939/LB

24 Albert Square London Lambeth SW8 1DA

Replacement of two non-original third floor timber sash windows on the principal elevation with bespoke painted hardwood sash windows incorporating sl...

Listed Building Consent Lambeth
20 Aug 2026 Awaiting decision 26/02045/LDCP

95 Ferndale Road London SW4 7RL

Application for a Certificate of Lawful Development (Proposed) with respect to replacing existing front and rear timber sash windows with double glaze...

Certificate of Lawful Use proposed Lambeth
19 Aug 2026 Awaiting decision 26/02101/FUL

23 Lansdowne Gardens London SW8 2EQ

Application for Full Planning Permission for the installation of loft insulation, vacuum glazing windows, heat pump and replacement of synthetic slate...

Full Planning Permission Lambeth
19 Aug 2026 Awaiting decision 26/02128/FUL

24 Atherfold Road London SW9 9LW

Alteration to fenestration involving the replacement of existing ground floor rear door with a window. Enlargement of existing window and replacement ...

Full Planning Permission Lambeth
18 Aug 2026 Awaiting decision 26/02372/LB

2A Norwood High Street London Lambeth SE27 9NS

Reconfiguration of the ground-to-first floor and ground-to-basement staircases, with the basement staircase to include new steps introduced in the lig...

Listed Building Consent Lambeth
18 Aug 2026 Awaiting decision 26/02371/FUL

2A Norwood High Street London Lambeth SE27 9NS

Reconfiguration of the ground-to-first floor and ground-to-basement staircases, with the basement staircase to include new steps introduced in the lig...

Full Planning Permission Lambeth
18 Aug 2026 Awaiting decision 26/02042/FUL

170 Rosendale Road London SE21 8LG

Erection of a single storey side and rear extension at lower ground floor with a side window; conversion of the garage into habitable rooms with a fro...

Full Planning Permission Lambeth
17 Aug 2026 Awaiting decision 26/02026/LDCP

34 Fairmile Avenue London SW16 6AG

Certificate of Lawful Development (Proposed) with respect to the formation of a vehicle crossover (dropped kerb) to provide vehicle access to the fron...

Certificate of Lawful Use proposed Lambeth
17 Aug 2026 Awaiting decision 26/02361/FUL

41 Stockwell Road London Lambeth SW9 9QB

Replacement double glazed timber and casement windows

Full Planning Permission Lambeth
14 Aug 2026 Pending 26/02356/FUL

25 Madeira Road London SW16 2DG

Retrospective application for the retention of a front boundary treatment comprising a yellow-brick dwarf wall, stone piers, close-boarded timber fenc...

Full Planning Permission Lambeth
14 Aug 2026 Awaiting decision 26/02270/FUL

88A Kingswood Road London Lambeth SW2 4JJ

Construction of new dormer to rear and part loft conversion and three rooflights to the front.

Full Planning Permission Lambeth
14 Aug 2026 Pending 26/02120/FUL

104 Knollys Road London SW16 2JU

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

Full Planning Permission Lambeth
14 Aug 2026 Approved 26/02358/LDCP

27 Doverfield Road London SW2 5NE

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

Certificate of Lawful Use proposed Lambeth
14 Aug 2026 Awaiting decision 26/02092/FUL

12A Arlingford Road London Lambeth SW2 2SU

Retrospective permission for the formation of metal steps from Ground floor to lower Ground floor Garden and associated Opaque privacy screen, based o...

Full Planning Permission Lambeth
13 Aug 2026 Pending 26/02344/FUL

5B Woodland Hill London SE19 1PB

Erection of mansard roof extensions to the rear roof slope of the main building and above the rear outrigger.

Full Planning Permission Lambeth
13 Aug 2026 Pending 26/02342/LB

206A Brixton Road London SW9 6AP

Installation of three conservation-style rooflights, comprising one rooflight to the front roof slope and two rooflights to the rear roof slopes, toge...

Listed Building Consent Lambeth
13 Aug 2026 Awaiting decision 26/02291/LDCP

38 Gubyon Avenue London SE24 0DX

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

Certificate of Lawful Use proposed Lambeth
13 Aug 2026 Awaiting decision 26/02002/LB

St Martin In The Fields High School 155 Tulse Hill London SW2 3UP

Part change of use of existing building and associated internal alterations to provide secure accommodation for vulnerable young adults (5 Bedrooms),t...

Listed Building Consent Lambeth
13 Aug 2026 Pending 26/02001/FUL

St Martin In The Fields High School 155 Tulse Hill London SW2 3UP

Part change of use of existing building and associated internal alterations to provide secure accommodation for vulnerable young adults (5 Bedrooms),t...

Full Planning Permission Lambeth
12 Aug 2026 Pending 26/02129/P1AA

51 Claylands Road London SW8 1PH

Application for prior approval for the enlargement of the dwellinghouse by construction of one additional storey at a total maximum height of 2.63m (o...

AA Enlarge dwelling additional storey Lambeth
12 Aug 2026 Awaiting decision 26/02306/FUL

215 Streatham High Road London SW16 6EN

Extension and infill of the existing rear lightwell/courtyard area to connect the existing rearcommercial structure with the principal building, creat...

Full Planning Permission Lambeth
11 Aug 2026 Awaiting decision 26/01902/LDCP

108 Ramillies Close London SW2 5DQ

Application for a Certificate of Lawful Development (Proposed) with respect to installation of new windows, new external doors, new insulated flat/bay...

Certificate of Lawful Use proposed Lambeth
11 Aug 2026 Awaiting decision 26/02295/LDCP

103 Narbonne Avenue London SW4 9LQ

Application for a Certificate of Lawful Certificate (Proposed) with respect to internal alterations only.

Certificate of Lawful Use proposed Lambeth
10 Aug 2026 Pending 26/02289/FUL

16-17 Shop Crystal Palace Parade London Lambeth SE19 1UA

Alterations to the existing external restaurant terrace, comprising the replacement of the existing canopy, front balustrade and side screens/enclosur...

Full Planning Permission Lambeth
10 Aug 2026 Awaiting decision 26/02290/FUL

78 Elms Crescent London SW4 8QX

Erection of a single storey ground floor rear and side infill extension. First floor side extension; rear mansard roof extension with juliet balcony a...

Full Planning Permission Lambeth
10 Aug 2026 Awaiting decision 26/02294/PDE

81 Hubert Grove London SW9 9NY

Application for prior approval for the erection of a single storey ground floor rear extension with dimensions of 6.00m (length), 3.00m (total maximum...

Householders Extensions Prior Approval Lambeth
7 Aug 2026 Pending 26/02287/LB

206A Brixton Road London SW9 6AP

Application for Listed Building Consent in relation to internal alterations to the ground floor communal lobby, including reinstatement of a door open...

Listed Building Consent Lambeth
7 Aug 2026 Awaiting decision 26/02275/FUL

17 Leander Road London SW2 2ND

Erection of a single storey ground floor rear and side infill extension with a courtyard - Flat 1.

Full Planning Permission Lambeth
7 Aug 2026 Awaiting decision 26/01852/FUL

33 Holmewood Road London SW2 3RP

Retrospective application for the erection of a single storey ground floor rear extension. Erection of a square infill (corner) at first and second fl...

Full Planning Permission Lambeth
7 Aug 2026 Awaiting decision 26/02283/PDE

28 Helmsdale Road London Lambeth SW16 5UR

Application for prior approval for the erection of a single storey ground floor rear extension with dimensions of 6.0m (length), 3.6m (total maximum h...

Householders Extensions Prior Approval Lambeth
5 Aug 2026 Awaiting decision 26/02141/LDCP

42 Ramillies Close London SW2 5DG

Certificate of Lawful Development (Proposed) with respect to the retrofitting of the property, involving external fixtures, new external doors, new in...

Certificate of Lawful Use proposed Lambeth
5 Aug 2026 Awaiting decision 26/02253/PDE

34 Acland Crescent London Lambeth SE5 8EQ

Application for prior approval for the erection of a single storey ground floor rear extension with dimensions of 6.0m (length), 3.0m (total maximum h...

Householders Extensions Prior Approval Lambeth
4 Aug 2026 Awaiting decision 26/02243/FUL

38 Tankerville Road London SW16 5LP

Erection of a first floor side extension.

Full Planning Permission Lambeth
4 Aug 2026 Awaiting decision 26/02218/RG3

97 And 98 Ramillies Close London SW2 5DQ

Replacement of windows and doors, the replacement of roof finishings, and replacement of light wells in main roof.

Approval under Reg 3 Councils own dev Lambeth
4 Aug 2026 Awaiting decision 26/02219/RG3

49 Ramillies Close London SW2 5DG

Replacement of windows and doors, the replacement of roof finishings, and replacement of light wells in main roof.

Approval under Reg 3 Councils own dev Lambeth
4 Aug 2026 Pending 26/02216/RG3

37 Ramillies Close London SW2 5DG

Retrofitting of the property, involving the replacement of windows and doors, upgrading roof including the replacement of roof finishings, and replace...

Approval under Reg 3 Councils own dev 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.