House extensions in Barnet

Barnet received 2,400 householder applications in the last 12 months - about 46 a week. Rear extensions and dormers are the most common. Of the 1,920 decided so far, 1,443 were approved. If you're planning your own, the applications below show what people nearby applied for and how the council decided.

Date received
Get alerts for Barnet

Filter applications

Date receivedLast 90 days
Date receivedLast 90 days
Select one year, or two for a range.
Number of homesAny
StatusAny
Application routeAny
Application type1 selected
KeywordsNone
Match

Matches words or phrases in the application address and description.

Showing 50 of 634 applications
Yesterday Pending 26/3886/PNH

31 Bethune Avenue London N11 3LD

Single Storey Rear Extension with a depth of 4.00 metres, a maximum height of 3.10 metres and an eaves height of 2.68 metres

Barnet
Yesterday Pending 26/3881/HSE

9 Walfield Avenue London N20 9PS

Single storey rear extension. Replacement front porch

Barnet
Yesterday Pending 26/3880/192

9 Walfield Avenue London N20 9PS

Roof extension involving hip to gable, rear dormer window with juliette balcony and 2no. front facing rooflights

Barnet
Yesterday Pending 26/3879/192

60 Lincoln Avenue London N14 7LH

Single storey rear extension with 1no. rooflight following demolition of the existing extension

Barnet
Yesterday Pending 26/3877/PNH

90 Cumbrian Gardens London NW2 1EL

Single storey rear extension with a proposed depth of 6.00 metres, a maximum height of 3.00 metres and an eaves height of 3.00 metres, following demol...

Barnet
Yesterday Pending 26/3874/PNH

9 Devonshire Road London NW7 1NE

Single storey rear extension with a proposed depth of 6 metres, maximum height of 3.4 metres and eaves height of 3 metres

Barnet
Yesterday Pending 26/3872/192

21 Elmhurst Avenue London N2 0LT

Erection of a single storey garden room within the rear garden

Barnet
Yesterday Pending 26/3870/192

52 Clitterhouse Road London NW2 1DJ

Roof extension involving rear dormer window and 2no. front facing rooflights

Barnet
Yesterday Pending 26/3866/HSE

50 Brookside Road London NW11 9NE

Part single, part two storey side and rear with alterations to the exising patio area

Barnet
Yesterday Pending Consideration 26/3608/FUL

72 Mays Lane Barnet EN5 2DZ

Change of use of the property from a single family dwelling (Class C3) to a House in Multiple Occupation (HMO) (Class C4) including single storey rear...

Full Application Barnet
Yesterday Pending Consideration 26/3839/HSE

28 Ibsley Way Cockfosters EN4 9EY

Single storey rear infill extension with replacement roof, 2no. rooflights and enlargement of the patio area with associated balustrades and side boun...

Householder Application Barnet
Yesterday Pending Consideration 26/3861/HSE

9 St Marys Road London NW11 9UE

Rear raised platform with associated access steps, guard rails and privacy screen

Householder Application Barnet
23 Oct 2026 Pending Consideration 26/3857/192

2 Broadfields Avenue Edgware HA8 8PG

Erection of a rear outbuilding

Barnet
23 Oct 2026 Pending Consideration 26/3858/HSE

131 Rushgrove Avenue London NW9 6RG

Single storey rear extension. New front porch

Barnet
23 Oct 2026 Pending Consideration 26/3863/HSE

12 Vale Drive Barnet EN5 2ED

Single storey side and rear extension

Barnet
23 Oct 2026 Pending Consideration 26/3864/192

99 Park Road London NW4 3PA

2no. single storey rear extensions

Barnet
23 Oct 2026 Pending Consideration 26/3856/HSE

229 Hale Drive London NW7 3EH

Single storey rear extension

Barnet
23 Oct 2026 Pending Consideration 26/3853/HSE

30 Goldsmith Avenue London NW9 7HB

Single storey rear extension following demolition of the existing extension

Barnet
23 Oct 2026 Pending Consideration 26/3851/FUL

517 Watford Way London NW7 2QR

Single storey extension to the rear of the existing workshop building to provide relocated MOT Bay

Barnet
23 Oct 2026 Pending Consideration 26/3848/FUL

157 Brent Street London NW4 4DJ

Mansard roof extension involving 2no. front, 3no. side and 2no. rear dormer windows to provide 1no. self-contained flat including raising of the eaves...

Barnet
23 Oct 2026 Pending Consideration 26/3845/192

58 Linthorpe Road Barnet EN4 9BY

Erection of a rear outbuilding

Barnet
23 Oct 2026 Pending Consideration 26/3841/HSE

Manor House West Heath Close London NW3 7NJ

New metal framed pergola to upper ground floor rear terrace

Barnet
23 Oct 2026 Pending Consideration 26/3803/FUL

863 Finchley Road London NW11 8LX

Conversion of existing dwelling into 4no. self-contained residential units including: Part single, part two storey rear extension following demolition...

Barnet
23 Oct 2026 Pending Consideration 26/3549/FUL

1 Northiam London N12 7ET

Single storey side and rear extensions with associated access steps; Alterations to car park; Installation of ventilation equipment to flat roof withi...

Barnet
22 Oct 2026 Pending Consideration 26/3838/192

103 Arlington Road London N14 5BA

Roof extension involving hip to gable, rear dormer window, 2no. front facing rooflights and new side gable window

Barnet
22 Oct 2026 Pending Consideration 26/3835/PNH

3 Devonshire Crescent London NW7 1DN

Single storey rear extension with a proposed depth of 5.00 metres, maximum height of 3.48 metres and eaves height of 3.00 metres. Following demolition...

Barnet
22 Oct 2026 Pending Consideration 26/3833/HSE

47 Holne Chase London N2 0QG

Single storey rear extension. Replacement of single glazed windows with double glazing. Alterations to side/rear fenestration. Alterations and replace...

Barnet
22 Oct 2026 Pending Consideration 26/3832/PNH

48 Alverstone Avenue Barnet EN4 8EB

Single storey rear extension with a proposed depth of 4.5 metres, maximum height of 3.15 metres and eaves height of 3 metres following demolition of e...

Barnet
22 Oct 2026 Pending Consideration 26/3830/192

9 Croft Close London NW7 4QL

Erection of a rear outbuilding

Barnet
22 Oct 2026 Pending Consideration 26/3829/FUL

369 Watford Way London NW4 4TE

Change of use of the existing dwelling (Use Class C3) to a 11 bed 11 Person HMO (House in Multiple Occupation) (Use Class Sui Generis) including part ...

Barnet
22 Oct 2026 Pending Consideration 26/3828/FUL

41 - 43 Sneath Avenue London NW11 9AJ

Part single, part two storey rear extensions to both properties following the demolition of the single storey rear extension at no.43

Barnet
22 Oct 2026 Pending Consideration 26/3827/HSE

43 Hermitage Lane London NW2 2HE

Single storey rear extension with 3no. rooflights following demolition of the existing conservatory. Replacement front bay window and entrance porch. ...

Barnet
22 Oct 2026 Pending Consideration 26/3819/PNH

78 Russell Lane London N20 0AP

2no. Single storey rear extensions with a proposed depth of 7.00 metres, maximum height of 3.60 metres and eaves height of 3.00 metres. Following demo...

Barnet
21 Oct 2026 Pending Consideration 26/3823/PNH

7 Southbourne Crescent London NW4 2LB

Single storey rear extension added to an existing extension with the total extension measuring 6.00 metres deep, with a maximum height of 3.00 metres ...

Barnet
21 Oct 2026 Pending Consideration 26/3821/FUL

170 Long Lane London N3 2RA

Roof extension with rear dormer windows and 5no. rooflights to provide 1no. self-contained flat

Barnet
21 Oct 2026 Pending Consideration 26/3820/192

104 Leeside Crescent London NW11 0JY

Roof extension involving side and rear dormer windows

Barnet
21 Oct 2026 Pending Consideration 26/3815/HSE

17 Hurstwood Road London NW11 0AS

Single storey rear extension

Barnet
21 Oct 2026 Pending Consideration 26/3814/192

17 The Reddings London NW7 4JN

Roof extension involving hip to gable, rear dormer window and 3no. front facing rooflights

Barnet
21 Oct 2026 Pending Consideration 26/3810/192

50 Green Lane Edgware HA8 7PX

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

Barnet
21 Oct 2026 Pending Consideration 26/3809/PND

10 Clifford Road Barnet EN5 5PG

Demolition of existing garage

Barnet
21 Oct 2026 Pending Consideration 26/3802/HSE

23 Basing Hill London NW11 8TE

Part single, part two storey side and rear and lower ground extension with associate new terrace, access steps and lower ground level patio. Conversio...

Barnet
21 Oct 2026 Pending Consideration 26/3783/HSE

99 Francklyn Gardens Edgware HA8 8SB

Two storey rear extension

Barnet
20 Oct 2026 Pending Consideration 26/3801/HSE

10 Pepys Crescent Barnet EN5 3EG

Single storey front porch extension with pitched roof

Barnet
20 Oct 2026 Pending Consideration 26/3800/HSE

29 Monks Avenue Barnet EN5 1BZ

Single storey side and rear infill extension including new front porch following demolition of the side/rear storage.

Barnet
20 Oct 2026 Pending Consideration 26/3799/HSE

1 Queens Avenue London N3 2NN

Roof extension involving hip to gable, rear dormer window with juliette balcony and 2no. front facing rooflights

Barnet
20 Oct 2026 Pending Consideration 26/3791/HSE

149 Montrose Avenue Edgware HA8 0DZ

New front hardstanding and vechicular access to provide off-street parking

Barnet
20 Oct 2026 Pending Consideration 26/3759/FUL

89 Burleigh Gardens London N14 5AJ

Change of use of the outbuilding and main property from residential flats (Class C3) to an 8no. bed House in Multiple Occupation (HMO) (sui generis) i...

Full Application Barnet
20 Oct 2026 Pending Consideration 26/3790/HSE

2 Inglis Way London NW7 1FJ

Excavation of basement. Single storey side extension. Roof extension involving with rear dormer window and side rooflight. Two new windows to west ele...

Householder Application Barnet
20 Oct 2026 Pending Consideration 26/3793/HSE

5 Parkside London NW7 2LJ

Part single, part two storey side extension. Single storey rear extension with new raised patio with access steps. Demolition of the existing garage. ...

Householder Application Barnet
20 Oct 2026 Pending Consideration 26/3768/192

52 Hodford Road London NW11 8NJ

Roof extension including partial hip to gable, rear dormer window, 1no. front facing rooflight and associated alterations to side gable windows

Proposed Lawful Development Certificate Barnet
Recency
Last 2 weeks
2-4 weeks
1-2 months
Older

Get free email alerts for new extensions applications in Barnet

Set up alerts

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.