3 Oakleigh Park South London N20 9JS Data via plota.co.uk

26/1023/HSE - Householder Application Approved
Extensions & alterations

Proposal

Single storey rear extension. Changes to fenestration including new side door and installation of double width garage door to return garage to original use Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
17 Mar 2026
✓
Consultation
26 Mar 2026
✓
Approved
11 May 2026

Approved on 11 May 2026 · Delegated Decision · Last checked 7 Jul 2026

Documents 10

Decision & officer reports 2

PDF DELEGATED REPORT Report · 12 May 2026 View ↗ PDF DN: APPROVE HSE WITH CONDS Decision Notice · 11 May 2026 View ↗

Plans & drawings 5

PDF AMENDED PROPOSED GROUND FLOOR PLAN AND ELEVATIONS Revised Drawing · 21 Apr 2026 View ↗ PDF EXISTING GROUND FLOOR Drawing · 17 Mar 2026 View ↗ PDF EXISTING FIRST/SECOND FLOOR Drawing · 17 Mar 2026 View ↗ PDF EXISTING ELEVATIONS Drawing · 17 Mar 2026 View ↗ PDF PROPOSED FIRST/SECOND FLOOR Drawing · 17 Mar 2026 View ↗

Application forms 2

PDF APPLICATION FORM - WITHOUT PERSONAL DATA Application Form · 17 Mar 2026 View ↗ PDF COMMUNITY INFRASTRUCTURE LEVY - COMPLETED FORM CIL Document · 17 Mar 2026 View ↗

Other documents 1

PDF SITE NOTICE Photo · 25 Mar 2026 View ↗

All documents on the council site ↗

Associated applications 2

  • HouseholderApproved26/1023/HSEThis application
    Single storey rear extension. Changes to fenestration including new side door and installation of double width garage door…

Site constraints 5

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 Named permitted development rights are withdrawn here.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
1 listed building within 150 m; Inside the Barnet built-up area; Public transport access: PTAL 2 (poor), TfL 2023, for the 100 m square.
Not affected
Outside flood zones 2 and 3 · Not green belt · No scheduled monument at the site

Checked on 6 October 2026. Historic England, the Environment Agency, Natural England, Transport for London (public transport access levels, Powered by TfL Open Data, OGL v3.0, contains OS data © Crown copyright and database right 2025) 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.

Sales history 1

Last sold for £2,350,000 in December 2025. Detached house, freehold.

17 December 2025£2,350,000

Sale prices from HM Land Registry's price paid record, matched to this application by its address.

Building

Floor area517 m² (5,565 sq ft)
Energy ratingF (36 out of 100), could reach D
PropertyDetached house, 10 habitable rooms
Built1900 to 1929
HeatingBoiler and radiators, mains gas
WallsSolid brick, as built, no insulation (assumed)

From the energy performance certificate lodged in August 2024, the latest held for this property. The building may have changed since. View the certificate

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Important details

Council
Barnet
Application type
Householder Application
Postcode
N20 9JS
Received
17 Mar 2026
Validated
17 Mar 2026
Ward
Whetstone
Case officer
Show
Target decision
12 May 2026
Decision
Approve subject to conditions
Decision date
11 May 2026
Decision level
Delegated Decision
Agent
A.J Ferryman & Associates

How this decision compares

Decided in 55 days from validation, about the council's usual 52 days. Approved, as 75% of extensions here are.

87%decided within 8 weeks
75%approved
1,904decided 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

Comments by
16 Apr 2026
Site or press notice
26 Mar 2026
Statutory expiry
12 May 2026

Historical activity at this location

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

Within ~100m

Nearby activity

2025 Approved
30 Oakleigh Avenue London N20 9JH
1 x Large Oak - Remove three large dead branches in the low/mid canopy overhanging the ne…
TPP/0760/25
2025 Refused
36 Oakleigh Avenue London N20 9JJ
Two storey front extension. Extensions and alterations to existing roof form, new gable e…
25/4312/HSE
2025 Approved
30 Oakleigh Avenue London N20 9JH
1 x Large Oak - Remove the two lowest branches and trunk growth. Remove major dead wood…
TPP/0714/25
2025 Approved
36 Oakleigh Avenue London N20 9JJ
Single-storey rear extension
25/2009/HSE
2025 Approved
26 Oakleigh Avenue London N20 9JH
Single storey rear extension
25/2206/HSE
2025 Approved
16 Oakleigh Park South London N20 9JU
Changes to side and rear extension fenestration including 3no. flat rooflights to replace…
25/2230/HSE
2025 Approved
The Mews Cottage 20 And A Half Oakleigh Park South London N20 9JU
Single storey front extension with pitched roof including associated relocation of main e…
25/1350/HSE
2025 Withdrawn
The Mews Cottage 20 And A Half Oakleigh Park South London N20 9JU
Part single, part two storey side and rear extension with pitched roof following demoliti…
25/0657/HSE
2024 Withdrawn
26 Oakleigh Avenue London N20 9JH
Single storey rear extension. New front porch
24/5223/HSE
2024 Approved
Gardenvale 4A Oakleigh Park South London N20 9JU
Conversion of the existing garage into habitable room, insertion of window to replace gar…
24/4910/HSE
2024 Approved
21 Oakleigh Park South London N20 9JS
1 x Ash - Reduce 2 meters from the lowest limb growing towards to the right hand side bor…
TPP/0544/24
2023 Approved
5 Oakleigh Park South London N20 9JS
Two storey rear extension following demolition of the existing rear extension with new pa…
23/1537/HSE
2022 Approved
12 Oakleigh Park South London N20 9JU
Part single, part two storey front extension incorporating new front entrance
22/5386/HSE
2022 Approved
The Mews Cottage 20 And A Half Oakleigh Park South London N20 9JU
Erection of rear outbuilding
22/3596/192
2022 Approved
Sisters Of The Sacred Heart 6 Oakleigh Park South London N20 9JU
Partial demolition(retrospective) of existing single storey extension and erection of a d…
22/0804/FUL
2022 Approved
The Mews Cottage 20 And A Half Oakleigh Park South London N20 9JU
Roof extension involving hip to gable, rear dormer with juliette balconies and 3no front…
22/2971/192
2022 Refused
The Mews Cottage 20 And A Half Oakleigh Park South London N20 9JU
Addition of second floor level with new roof
22/1250/HSE
2022 Approved
The Mews Cottage 20 And A Half Oakleigh Park South London N20 9JU
Single Storey Rear Extension with a proposed depth of 6.00 metres, a maximum height of 3…
22/0183/PNH
2021 Approved
Sisters Of The Sacred Heart 6 Oakleigh Park South London N20 9JU
Partial demolition of existing single storey extension and erection of a two storey detac…
21/3594/FUL
2021 Approved
Sisters Of The Sacred Heart 6 Oakleigh Park South London N20 9JU
Partial demolition of existing convent building and erection of a two storey detached bui…
21/3592/FUL
2019 Approved
Gardenvale 4A Oakleigh Park South London N20 9JU
Erection of a pergola to rear garden
19/2133/HSE
2017 Approved
Kandaw 19 Oakleigh Park South London N20 9JS
Demolition of single storey front garage projection
17/7176/HSE
2017 Approved
Park House 4A Oakleigh Park South London N20 9JU
Single storey rear extension
17/5586/HSE
2017 Approved
21 Oakleigh Park South London N20 9JS
Group of Ash (applicant's ref. G1) - Fell all stems in group to ground level. Group G109…
TPF/0512/17
2016 Refused
Kandaw 19 Oakleigh Park South London N20 9JS
Single storey rear extension and demolition of single storey front garage projection
16/8196/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

Sale prices: Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0.

Energy performance: Energy performance certificates from the Energy Performance of Buildings Register, Ministry of Housing, Communities and Local Government. Contains public sector information licensed under the Open Government Licence v3.0. © Crown copyright 2026.