House extensions in Barnet

Barnet received 1,894 householder applications in the last 12 months - about 36 a week. Rear extensions and dormers are the most common. Of the 1,380 decided so far, 1,020 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 671 applications
Yesterday Pending Consideration 26/3075/LBC

The Chantry And The White House Spaniards End London NW3 7JG

Installation of foundations under unsupported walls at lower ground floor level

Listed Building Consent / Demolition Barnet
Yesterday Pending Consideration 26/3290/HSE

8 Wessex Gardens London NW11 9RT

Single storey rear extension with new access steps following demolition of the existing conservatory. New side door

Householder Application Barnet
Yesterday Pending Consideration 26/3303/PNH

95 Bittacy Rise London NW7 2HH

Single storey rear extension with a proposed depth of 4.00 metres, maximum height of 4.00 metres and eaves height of 3.00 metres. Following demolition...

Prior Notification (Householder) Barnet
Yesterday Pending Consideration 26/3288/PNH

8 Wessex Gardens London NW11 9RT

2no. single-storey rear extensions with a proposed depth of 6.00 metres, a maximum height of 4.00 metres and an eaves height of 3.00 metres and a prop...

Prior Notification (Householder) Barnet
Yesterday Pending Consideration 26/3309/HSE

25 Grange Avenue Barnet EN4 8NJ

Part lower ground, part single storey and part two storey side and rear extensions incorporating a pitched roof and two rooflights, together with the ...

Householder Application Barnet
Yesterday Pending Consideration 26/3306/FUL

Ground Floor Flat 21 Elmcroft Crescent London NW11 9TB

Single storey rear infill extension

Full Application Barnet
Yesterday Pending Consideration 26/3300/HSE

42 Hillside Gardens Barnet EN5 2NJ

Single storey side extension with 4no. rooflights following demolition of the existing garage

Householder Application Barnet
Yesterday Pending Consideration 26/3304/HSE

20 Uphill Road London NW7 4RB

Alteration to existing front boundary wall and railings with associated landscaping

Householder Application Barnet
Yesterday Pending Consideration 26/3305/192

59 Belmont Avenue Barnet EN4 9JS

New front porch

Proposed Lawful Development Certificate Barnet
Yesterday Pending Consideration 26/3296/FUL

76 Southover London N12 7HB

Change of use from Hair Salon (Class E) to amalgamate first floor dwelling into enlarged self-contained dwelling (Class C3) including single storey re...

Full Application Barnet
2 days ago Pending Consideration 26/3250/PNH

29 Banstock Road Edgware HA8 9JQ

Single storey rear extension with a proposed depth of 5.70 metres, maximum height of 2.80 metres and eaves height of 2.60 metres. Following demolition...

Prior Notification (Householder) Barnet
2 days ago Pending 26/3026/HSE

1 Alderton Crescent London NW4 3XU

Single storey rear extension with 3no. rooflights following the demolition of existing store

Householder Application Barnet
2 days ago Pending 26/3168/FUL

Flat 1 23 Monkville Avenue London NW11 0AH

Single storey rear extension with new patio area

Barnet
2 days ago Pending 26/3228/FUL

104B Russell Lane London N20 0AS

Single storey rear extension with alterations to the existing balcony

Barnet
2 days ago Pending 26/3264/FUL

27 Connaught Road Barnet EN5 2PX

Roof extension with side and rear dormer windows and 2no. front facing rooflights

Barnet
2 days ago Pending 26/3279/HSE

6 Kingswood Park London N3 1UG

Single storey front infill extension and relocation of existing front door including new access steps. 2no. single storey rear extensions with pitched...

Barnet
2 days ago Pending 26/3270/HSE

82 Summerlee Avenue London N2 9QH

Erection of wooden bike shed in the front garden

Householder Application Barnet
2 days ago Pending 26/3272/HSE

35 Holne Chase London N2 0QL

Alterations to the front amenity space with associated level changes, revised hard and soft landscaping, new bin store and new side passage gates. Alt...

Barnet
2 days ago Pending 26/3267/HSE

106 The Greenway London NW9 5AP

Part single, part two storey side and rear extension with pitched roof following the demolition of existing conservatory and rear shed. Proposed new h...

Barnet
2 days ago Pending 26/3282/HSE

50 Green Lane Edgware HA8 7PX

First floor side dormer extension

Barnet
2 days ago Pending Consideration 26/3286/HSE

114 Leicester Road Barnet EN5 5DN

Alterations and extensions to roof including side and rear dormer windows, 2no. rooflights to front roofslope and raising of ridge height

Householder Application Barnet
2 days ago Pending 26/3284/HSE

145 Chase Side London N14 5HE

Single storey rear extension. New first floor rear window

Householder Application Barnet
2 days ago Pending Consideration 26/3281/PNH

61 Montpelier Rise London NW11 9DU

2no. single storey rear extensions with a proposed depth of 6.00 metres, a maximum height of 3.00 metres and an eaves height of 3.00 metres.

Prior Notification (Householder) Barnet
2 days ago Pending 26/3280/HSE

134 Bridge Lane London NW11 9JS

Part single, part two storey front and side extensions including conversion of the existing garage into habitable room and insertion of window to repl...

Householder Application Barnet
8 Sept 2026 Pending Consideration 26/3271/PNH

19 The Grove London NW11 9SJ

Single storey rear extension with a proposed depth of 5 metres, maximum height of 3.20 metres and eaves height of 3.00 metres. 2no. Single storey rear...

Prior Notification (Householder) Barnet
8 Sept 2026 Pending 26/3261/192

83 Mays Lane Barnet EN5 2DX

Erection of a rear outbuilding

Barnet
8 Sept 2026 Pending 26/3180/HSE

42 Church Vale London N2 9PA

Erection of a single storey rear outbuilding

Householder Application Barnet
8 Sept 2026 Pending 26/3237/HSE

79 Quinta Drive Barnet EN5 3DA

Part single, part two storey front, side and rear extension with first floor juliette balcony and alterations to the existing balcony and raised patio...

Householder Application Barnet
8 Sept 2026 Pending 26/3273/192

19 The Grove London NW11 9SJ

Roof extension involving crown roof to outrigger, rear dormer window, 3no. front facing rooflights and removal of the chimney

Proposed Lawful Development Certificate Barnet
7 Sept 2026 Pending 26/3254/PNH

14 Barnet Way London NW7 3BH

Single storey rear extension with a proposed depth of 6.00 metres, maximum height of 3.81 metres and eaves height of 2.50 metres. Following demolition...

Barnet
7 Sept 2026 Pending 26/2997/HSE

29 Sherwood Road London NW4 1AE

New first floor roof terrace to rear elevation with associated balustrade and privacy screening

Barnet
7 Sept 2026 Pending 26/3239/FUL

Henley Court Watford Way London NW4 4SR

Construction of additional floor to provide 7no. self-contained flats. Construction of two storey side extension with rooms in the roofspace to provid...

Full Application Barnet
7 Sept 2026 Pending 26/3262/HSE

170 Daneland Barnet EN4 8QB

New front hardstanding and vehicular access to provide off-street parking. New retaining wall and access steps with associated railings.

Householder Application Barnet
7 Sept 2026 Pending 26/3260/192

1 Alderton Crescent London NW4 3XU

Roof extension involving 2no. side dormers windows, 2no. rear windows, 1no. front facing rooflight and removal of chimney stack

Proposed Lawful Development Certificate Barnet
7 Sept 2026 Pending 26/3257/192

190 Nether Street London N3 1PE

Single storey rear extension. Conversion of the existing garage into habitable room, insertion of window and door to replace the garage door

Proposed Lawful Development Certificate Barnet
7 Sept 2026 Pending 26/3086/FUL

8 And 10 Campion Way Edgware HA8 9GE

New front porch extension to both properties

Barnet
7 Sept 2026 Pending 26/3248/192

6 Arden Road London N3 3AN

Roof extension involving side dormer window with pitched roof and glazing. Alterations to fenestration including insertion of first floor side window ...

Proposed Lawful Development Certificate Barnet
7 Sept 2026 Pending Consideration 26/3256/192

36 Friern Watch Avenue London N12 9NT

Roof extension involving hip to gable, rear dormer with juliette balcony, 3no. front facing rooflights and new side gable window. Removal of chimney s...

Proposed Lawful Development Certificate Barnet
7 Sept 2026 Pending 26/3255/192

50 Riverdene Edgware HA8 9TD

Conversion of the existing garage into habitable room, insertion of window and a door to replace garage door. Alterations to the rear of the garage in...

Proposed Lawful Development Certificate Barnet
7 Sept 2026 Pending 26/3249/HSE

19 Rushdene Avenue Barnet EN4 8EN

New front vehicular access and hardstanding to provide off-street parking space. Alterations to existing levels. New retaining wall following demoliti...

Householder Application Barnet
4 Sept 2026 Pending 26/3243/192

14 Barnet Way London NW7 3BH

New front porch

Proposed Lawful Development Certificate Barnet
4 Sept 2026 Pending 26/3014/FUL

130A Fairmead Crescent Edgware HA8 8YP

Reduction in size and retention of existing outbuilding for ancillary use

Full Application Barnet
4 Sept 2026 Pending 26/3196/HSE

25 Beechwood Avenue London N3 3AU

Single storey side extension. Part single, part two storey rear extension. Creation of new rear patio and steps to garden

Householder Application Barnet
4 Sept 2026 Pending Consideration 26/3224/PNH

Low Ridge Rowley Lane Barnet EN5 3HS

Single storey rear extension with a proposed depth of 8.00 metres, maximum height of 3.00 metres and eaves height of 3.00 metres.

Prior Notification (Householder) Barnet
4 Sept 2026 Pending Consideration 26/3235/HSE

26 Mount Pleasant Barnet EN4 9HH

Replace existing flat roof at ground floor rear elevation with pitched roof and 2no. rooflights

Householder Application Barnet
3 Sept 2026 Pending 26/3232/192

50 Green Lane Edgware HA8 7PX

Roof extension involving side and rear dormer window and 2no. front facing rooflights. Conversion of the existing garage into habitable room, insertio...

Proposed Lawful Development Certificate Barnet
3 Sept 2026 Pending 26/3203/192

14 Abbots Gardens London N2 0JQ

Conversion of garage into habitable room, insertion of window to replace existing front garage door. Removal of pitched roof of existing single storey...

Proposed Lawful Development Certificate Barnet
3 Sept 2026 Pending Consideration 26/3183/PNH

34 Selvage Lane London NW7 3SP

Single storey rear extension with a proposed depth of 3.80 metres, maximum height of 3.00 metres and eaves height of 2.75 metres, following partial de...

Prior Notification (Householder) Barnet
3 Sept 2026 Pending 26/3210/HSE

47 Pattison Road London NW2 2HL

New front vehicular access to provide off-street parking. Removal of existing gate and shed, alterations to the existing front boundary wall and insta...

Barnet
3 Sept 2026 Pending 26/3223/192

51 Ridgeway Avenue Barnet EN4 8TN

Single storey rear extension with flat rooflights and 2no. roof lanterns

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

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