House extensions in Barnet

Barnet received 823 householder applications in the last 12 months - about 16 a week. Rear extensions and dormers are the most common. Of the 439 decided so far, 330 were approved. If you're planning your own, the applications below show what people nearby applied for and how the council decided.

597 last 90 days
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186 last 30 days
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50 last 14 days

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Showing 50 of 597 applications
26/2581/HSE 9 Jul 2026 Pending

2 Downhurst Avenue London NW7 3QA

Single storey rear extension

Barnet 9 Jul 2026
26/2578/FUL 9 Jul 2026 Pending

20 Golders Manor Drive London NW11 9HT

Single storey rear extension. Roof extension involving rear dormer window and 2no. front facing rooflights. New front entrance porch

Barnet 9 Jul 2026
26/2580/HSE 9 Jul 2026 Pending

7 Earl Close London N11 3PY

Single storey rear extension. New front door following removal window. of Erection of a rear shed

Barnet 9 Jul 2026
26/2570/192 8 Jul 2026 Pending

1 Dudley Road London N3 2QR

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

Barnet 8 Jul 2026
26/2566/FUL 8 Jul 2026 Pending

25 Edgwarebury Lane Edgware HA8 8LJ

Single storey side extension

Barnet 8 Jul 2026
26/2569/HSE 8 Jul 2026 Pending

20 Oakhampton Road London NW7 1NH

Replacement of existing conservatory roof with flat roof. Changes to fenestration

Barnet 8 Jul 2026
26/2550/FUL 7 Jul 2026 Pending

28A Great North Way London NW4 1HY

Roof extension involving rear dormer window and 1no. front facing rooflight

Barnet 7 Jul 2026
26/2549/FUL 7 Jul 2026 Pending

Ground Floor Flat 10 Dukes Avenue London N3 2DD

Erection of a rear outbuilding

Barnet 7 Jul 2026
26/2552/HSE 7 Jul 2026 Pending

34 Hillside Gardens Edgware HA8 8HE

Part single, part two storey front, side and rear extensions following demolition of the existing garage. Roof extension including hip to gable and re...

Barnet 7 Jul 2026
26/2561/192 7 Jul 2026 Pending

47 Greenfield Gardens London NW2 1HT

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

Barnet 7 Jul 2026
26/2525/192 6 Jul 2026 Pending Consideration

39 Ridgeway Avenue Barnet EN4 8TN

Single storey rear extension

Proposed Lawful Development Certificate Barnet 6 Jul 2026
26/2542/192 6 Jul 2026 Pending Consideration

18 Redbourne Avenue London N3 2BS

Erection of rear outbuilding

Proposed Lawful Development Certificate Barnet 6 Jul 2026
26/2526/FUL 6 Jul 2026 Pending Consideration

Ground And First Floor Flats 50 Manor View London N3 2SR

Conversion of 2no. self contained flats into single family dwelling including single storey rear extension with 1no. rooflight

Full Application Barnet 6 Jul 2026
26/2543/192 6 Jul 2026 Pending Consideration

2 Oak Close London N14 5NR

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

Proposed Lawful Development Certificate Barnet 6 Jul 2026
26/2513/192 3 Jul 2026 Pending Consideration

120 Woodgrange Avenue London N12 0PS

Roof extension involving rear dormer window and 3no. front facing rooflights

Proposed Lawful Development Certificate Barnet 3 Jul 2026
26/2519/FUL 3 Jul 2026 Pending Consideration

129 Kenilworth Road Edgware HA8 8XB

Two storey side extension following demolition of the exiting storage area to form a two storey dwellinghouse with associated amenity space, off-stree...

Full Application Barnet 3 Jul 2026
26/2520/HSE 3 Jul 2026 Pending Consideration

113 Princes Park Avenue London NW11 0JS

Part single, part two storey rear extension following demolition of existing ground floor extension

Householder Application Barnet 3 Jul 2026
26/2511/192 3 Jul 2026 Pending Consideration

47 Audley Road London NW4 3EX

Roof extension involving rear dormer window and 3no. front facing rooflights

Proposed Lawful Development Certificate Barnet 3 Jul 2026
26/2512/192 3 Jul 2026 Pending Consideration

32 Haslemere Avenue Barnet EN4 8EZ

Roof extension involving hip to gable, rear dormer window, 3no. front facing rooflights and new side gable window. Erection of a rear outbuilding

Proposed Lawful Development Certificate Barnet 3 Jul 2026
26/2518/PNH 3 Jul 2026 Pending Consideration

12 Park Way London NW11 0EX

2no. single storey rear extensions with a proposed depth of 8.00m, maximum height of 3.30m and eaves height of 3.00m

Prior Notification (Householder) Barnet 3 Jul 2026
26/2497/192 2 Jul 2026 Pending Consideration

27 Riverside London NW4 3TU

Single storey rear extension with 2no. rooflights

Proposed Lawful Development Certificate Barnet 2 Jul 2026
26/2496/192 2 Jul 2026 Pending

8 Fursby Avenue London N3 1PL

Erection of a rear outbuilding following demolition of the existing outbuilding. Replacement of existing boundary fencing

Proposed Lawful Development Certificate Barnet 2 Jul 2026
26/2495/LBC 2 Jul 2026 Pending Consideration

Golders Green Crematorium Hoop Lane London NW11 7NL

Removal of existing 3no. cremators and the installation of new cremators 2no. together with flue gas treatment plant. Removal of non-loadbearing inter...

Listed Building Consent / Demolition Barnet 2 Jul 2026
26/2498/192 2 Jul 2026 Pending Consideration

2 Danescroft Gardens London NW4 2ND

Roof extension involving wraparound side and rear dormer windows and 1no. front facing rooflight

Proposed Lawful Development Certificate Barnet 2 Jul 2026
26/2503/192 2 Jul 2026 Pending Consideration

57 Holders Hill Avenue London NW4 1ES

Roof extension involving hip to gable, rear dormer window with juliette balcony and 3no. front facing rooflights. Erection of a rear outbuilding

Proposed Lawful Development Certificate Barnet 2 Jul 2026
26/2499/192 2 Jul 2026 Lawful

2 Bittacy Close London NW7 1RU

Roof extension involving side dormer windows and rooflights. New ground floor fenestration

Proposed Lawful Development Certificate Barnet 2 Jul 2026
26/2485/HSE 1 Jul 2026 Pending

32 Lancaster Road Barnet EN4 8AP

Erection of outbuilding in rear garden following demolition of existing outbuilding

Householder Application Barnet 1 Jul 2026
26/2483/HSE 1 Jul 2026 Pending

13 Aldridge Avenue Edgware HA8 8TA

Single storey rear extension with 2no. rooflights following demolition of existing conservatory

Householder Application Barnet 1 Jul 2026
26/2484/HSE 1 Jul 2026 Pending

10 Wentworth Road Barnet EN5 4NT

Erection of a rear outbuilding following demolition of the existing outbuilding

Householder Application Barnet 1 Jul 2026
26/2488/192 1 Jul 2026 Pending

49 Wilton Road London N10 1LX

Roof extension involving rear dormer window and 2no. front facing rooflights following removal of the existing chimney

Proposed Lawful Development Certificate Barnet 1 Jul 2026
26/2489/HSE 1 Jul 2026 Pending Consideration

24 Minotaur Drive Barnet EN5 2FS

Alteration and conversion of the existing loft space including 2no. front and rear facing rooflights

Householder Application Barnet 1 Jul 2026
26/2487/HSE 1 Jul 2026 Pending Consideration

31 Haslemere Avenue London NW4 2PU

Single storey front extension with new porch with canopy and front bay window. Part single, part two storey side and rear wraparound extensions with n...

Householder Application Barnet 1 Jul 2026
26/2468/192 30 Jun 2026 Pending

48 Golders Gardens London NW11 9BU

Roof extension involving hip to gable, rear dormer window. New front porch

Proposed Lawful Development Certificate Barnet 30 Jun 2026
26/2481/192 30 Jun 2026 Pending

39 Windsor Road London N3 3SN

Roof extension involving hip to gable with rear dormer windows, 1no. front, 1no. rear facing rooflight following demolition of existing chimney

Proposed Lawful Development Certificate Barnet 30 Jun 2026
26/2471/PNH 30 Jun 2026 Pending

14 Cranbourne Gardens London NW11 0HP

Single storey rear extension with a proposed depth of 6m (from original rear wall), maximum height of 2.9m and eaves height of 2.9m

Prior Notification (Householder) Barnet 30 Jun 2026
26/2478/RCU 30 Jun 2026 Pending

129 Nether Street London N12 8AB

New front hardstanding and vehicular access to provide off-street parking. Installation of garden wall and front access gates. (Retrospective Applicat...

Retention/Continued Use Barnet 30 Jun 2026
26/2474/HSE 30 Jun 2026 Pending

13 Monkville Avenue London NW11 0AH

First floor side extension and rear extension

Householder Application Barnet 30 Jun 2026
26/2476/FUL 30 Jun 2026 Pending Consideration

First Floor Flat 11 St Marys Road London NW11 9UE

Roof extension involving rear dormer and 1no. rear and 3no. front facing rooflights

Full Application Barnet 30 Jun 2026
26/2463/FUL 29 Jun 2026 Pending Consideration

Flat 2 44A Wenlock Road Edgware HA8 9JF

Single storey rear extension and alterations of the existing side flat roof to a pitched and tiled roof

Full Application Barnet 29 Jun 2026
26/2461/HSE 29 Jun 2026 Pending Consideration

Semmering 65 Barnet Road Barnet EN5 3HB

Two storey side extension with new patio with new access steps following removal of the existing garage and extensions. Roof extension with front and ...

Householder Application Barnet 29 Jun 2026
26/2453/HSE 29 Jun 2026 Pending Consideration

39 Oldberry Road Edgware HA8 9DA

Part single, part two storey rear extension with 1no. rooflight and pitched roof

Householder Application Barnet 29 Jun 2026
26/2457/LBC 29 Jun 2026 Pending Consideration

Abbeyfield House Homesfield London NW11 6HL

Replacing unoriginal flat roof covering over first floor rear balcony

Listed Building Consent / Demolition Barnet 29 Jun 2026
26/2451/HSE 29 Jun 2026 Pending Consideration

52 Lichfield Grove London N3 2JP

Erection of a single storey side and rear extension with 3no. rooflights, first floor rear extension with pitched roof reinstatement of original front...

Householder Application Barnet 29 Jun 2026
26/2454/HSE 29 Jun 2026 Pending Consideration

165 Blundell Road Edgware HA8 0JF

Single storey side extension following demolition of the existing garage

Householder Application Barnet 29 Jun 2026
26/2450/HSE 29 Jun 2026 Pending Consideration

117 Banstock Road Edgware HA8 9JH

Single storey rear extension with 2no. rooflights

Householder Application Barnet 29 Jun 2026
26/2440/FUL 26 Jun 2026 Pending Consideration

Yew Tree Court Bridge Lane London NW11 0RA

Installation of new Sukkah Roofs and AOV ( automatic opening vent) rooflights to flat roof mansard

Full Application Barnet 26 Jun 2026
26/2429/192 26 Jun 2026 Pending Consideration

50 Neeld Crescent London NW4 3RR

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

Proposed Lawful Development Certificate Barnet 26 Jun 2026
26/2426/HSE 26 Jun 2026 Pending Consideration

1 Vaughan Avenue London NW4 4HT

Two storey side and front extension. New front canopy. Two storey front gable feature. Two storey rear extension with new patio area. Alterations to e...

Householder Application Barnet 26 Jun 2026
26/2438/FUL 26 Jun 2026 Pending Consideration

First Floor Flat 172 Squires Lane London N3 2QT

Roof extension involving rear dormer window and 3no. front facing rooflights

Full Application Barnet 26 Jun 2026
26/2434/PNH 26 Jun 2026 Pending Consideration

50 Neeld Crescent London NW4 3RR

Single storey rear extension with a proposed depth of 6.00m, maximum height of 3.50m and an eaves height of 3.00m

Prior Notification (Householder) Barnet 26 Jun 2026
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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 — taller, larger, 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 with objections) 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.