15 Haslemere Avenue London NW4 2PU Data via plota.co.uk

26/1594/192 - Proposed Lawful Development Certificate Approved
Extensions & alterations

Proposal

Erection of a rear outbuilding Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
28 Apr 2026
✓
Validated
1 May 2026
✓
Approved
26 Jun 2026

Approved on 26 Jun 2026 · Delegated Decision · Last checked 19 Jul 2026

Documents 5

Decision & officer reports 1

PDF DN: LAWFUL 192 Decision Notice · 26 Jun 2026 View ↗

Plans & drawings 3

PDF AMENDED OUTBUILDING PLANS Drawing · 26 Jun 2026 View ↗ PDF THE LOCATION PLAN Site Location Plan · 28 Apr 2026 View ↗ PDF BLOCK PLAN OF THE SITE Block plan · 28 Apr 2026 View ↗

Application forms 1

PDF APPLICATION FORM - WITHOUT PERSONAL DATA Application Form · 28 Apr 2026 View ↗

All documents on the council site ↗

Site constraints 3

Article 4 direction
Article 4 Small Houses in Multiple Occupation (HMO) Area 1. Named permitted development rights are withdrawn here.
An Article 4 direction withdraws particular permitted development rights, so work that would normally need no application needs one here. Not every council has published its directions.
Air quality management area: Barnet AQMA
The council has declared the area as failing an air quality objective.
Schemes that add traffic, parking or combustion plant are assessed against the area's action plan and may need an air quality assessment.
Council record ↗
Also on the record
Inside the Barnet built-up area.
Not affected
Outside flood zones 2 and 3 · Not green belt · No listed building at the site

Checked on 11 September 2026. Historic England, the Environment Agency, Natural England and council datasets, Open Government Licence. A boundary can run through a site and the council holds the definitive record: confirm with the council before relying on this.

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Other new applications on this street

1 Jul 2026Approved

31 Haslemere Avenue London NW4 2PU

Single storey front extension with new porch with canopy and front bay window. P...

26/2487/HSE

Nearby new applications

10 Sept 2026Pending

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10 Sept 2026Pending

31 Woodlands London NW11 9QJ

Single storey rear infill extension

26/3319/HSE
9 Sept 2026Pending

61 Montpelier Rise London NW11 9DU

2no. single storey rear extensions with a proposed depth of 6.00 metres, a maxim...

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10 Aug 2026Pending

36 Western Avenue London NW11 9HJ

Single storey rear and infill extension with new roof and 2no. rooflights and so...

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1 Sept 2026Pending

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Important details

Council
Barnet
Application type
Proposed Lawful Development Certificate
Postcode
NW4 2PU
Received
28 Apr 2026
Validated
1 May 2026
Ward
Hendon
Case officer
Show
Target decision
26 Jun 2026
Decision
Lawful
Decision date
26 Jun 2026
Decision level
Delegated Decision
Applicant
Show
Agent
Gold Sketch Studios Ltd

How this decision compares

Decided in 56 days from validation, about the council's usual 53 days. Approved, as 74% of extensions here are.

87%decided within 8 weeks
74%approved
1,436decided in the last year

Plota live figures for extensions decided by Barnet in the last twelve months, from validation. Barnet decision record →

Consultation & key dates

Alt. reference
PP-14880775

Historical activity at this location

25 nearby applications on record - archival context, not part of the live application.

Within ~100m

Nearby activity

2023 Approved
9 Mayfield Gardens London NW4 2PY
Erection of a part single part two storey side and rear extension. New front porch and tw…
23/4670/HSE
2022 Approved
29 Shirehall Lane London NW4 2PT
Single storey front, side and rear extension. First floor rear extension. Conversion of g…
22/5536/HSE
2023 Refused
37 Haslemere Avenue London NW4 2PU
Single storey rear extension following demolition of the existing extension. Addition of…
23/0649/192
2022 Refused
37 Haslemere Avenue London NW4 2PU
Roof extension involving hip to gable and rear dormer window
22/3734/HSE
2022 Withdrawn
37 Haslemere Avenue London NW4 2PU
Single storey rear extension. Roof extension involving wraparound rear/side dormer, repla…
22/2922/192
2022 Approved
31 Shirehall Lane London NW4 2PT
Part single, part two storey rear extension (AS AMENDED)
22/3999/HSE
2022 Approved
117 Shirehall Park London NW4 2QU
Single storey side extension. Extension of raised rear patio (AMENDED DESCRIPTION)
22/2954/HSE
2022 Approved
17 Haslemere Avenue London NW4 2PU
Roof extension involving a wraparound dormer windows, 2no side windows and 2no front faci…
22/3865/192
2022 Approved
105 Shirehall Park London NW4 2QU
Single storey front, side and rear extension following demolition of the existing garage…
22/2449/HSE
2022 Approved
31 Shirehall Lane London NW4 2PT
Part single, part two storey rear extension (Amended Plans)
22/1965/HSE
2022 Approved
35 Haslemere Avenue London NW4 2PU
Single storey front and side extension involving a new bay window and front porch. Conver…
22/1133/HSE
2022 Approved
105 Shirehall Park London NW4 2QU
Alterations to roof including 2no. hip to gable extensions and insertion of 3no. front an…
22/1866/192
2021 Approved
105 Shirehall Park London NW4 2QU
Single storey front, side and rear extension following demolition of the existing garage…
21/6709/HSE
2022 Refused
31 Shirehall Lane London NW4 2PT
Two storey rear extension
22/1094/192
2022 Approved
21 Haslemere Avenue London NW4 2PU
Part single, part two storey rear extension including removal of chimneys. Single storey…
22/1050/HSE
2022 Refused
17 Haslemere Avenue London NW4 2PU
Roof extension involving side and rear dormer windows
22/1358/192
2022 Approved
21 Mayfield Gardens London NW4 2PY
Single storey front, rear and side extension. Changes to fenestration
22/0634/HSE
2022 Approved
27 Mayfield Gardens London NW4 2PY
Single storey front extension. Part single, part two storey rear extension following demo…
22/1033/HSE
2021 Refused
31 Shirehall Lane London NW4 2PT
Part single, part two storey rear extension
21/6694/HSE
2022 Approved
35 Haslemere Avenue London NW4 2PU
Roof extension involving hip to gable, rear dormer window, 3no front facing rooflights. N…
22/0449/192
2016 Approved
13 Haslemere Avenue London NW4 2PU
Roof extension involving hip to gable, enlargement of existing rear dormer window to faci…
16/6974/HSE
2016 Approved
34 Haslemere Avenue London NW4 2PX
Part single part two storey rear extension. Single storey side extension. New front porch
16/3687/HSE
2016 Approved
34 Haslemere Avenue London NW4 2PX
Roof extension involving hip to gable, rear dormer window with 2no rooflights to front el…
16/3686/192
2016 Approved
19 Mayfield Gardens London NW4 2PY
Single storey rear extension. Removal of dual pitched roof on single storey side extension
16/1908/HSE
2016 Approved
13 Haslemere Avenue London NW4 2PU
Part single part two storey rear extension following partial rear demolition and demoliti…
16/0233/HSE
Barnet
Planning Authority Score
6.2/10
Average
#90 of 296 councils
Relevant to this application:
Householder decisions

Barnet is faster than most councils at deciding householder applications, ranking #42 out of 296. Only 25% of applications have the time limit extended, well below the 41% national average - the council usually decides on time. Barnet is also one of the strictest councils - it refuses more householder applications than almost any other, with only 82% approved vs 90% nationally.

One of the strictest councils
only 82% approved vs 90% nationally
These figures are council-wide context, not a prediction for this application. View full council performance
Barnet decision statistics
Based on MHCLG data, the year to March 2026
75%
Overall approval rate
Below avg (87%) #285 of 296
82%
Householder approved
Below avg (90%) #264 of 296
79%
Decided in 8 weeks
Above avg (63%) #42 of 296
25%
Extended time limit
Below avg (41%) #29 of 296
55%
Minor dwellings approved
319 decided (1-9 homes)
90%
Major dwellings approved
21 decided (10+ homes)
41%
Change of use approved
132 decided
2,541
Total decisions
625 refused in the year to March 2026
Source: MHCLG planning statistics · See full council rankings