14 Oakleigh Park North London N20 9AR Data via plota.co.uk

26/3121/192 - Proposed Lawful Development Certificate Refused
Extensions & alterations

Proposal

Changes to fenestration including new rear sliding doors, blocking of side door and new first floor rear balustrade. New rear terrace with access steps Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
24 Aug 2026
✓
Validated
25 Aug 2026
✗
Refused
18 Sept 2026
Appeal
Not lodged

Refused on 18 Sept 2026 · Delegated Decision · Last checked 22 Sept 2026

Documents 21

Decision & officer reports 2

PDF DELEGATED REPORT Report · 21 Sept 2026 View ↗ PDF DN: UNLAWFUL 192 Decision Notice · 18 Sept 2026 View ↗

Plans & drawings 17

PDF PROPOSED SECTION (AMENDED) Additional plans · 15 Sept 2026 View ↗ PDF THE LOCATION PLAN Site Location Plan · 24 Aug 2026 View ↗ PDF ELEVATION (SIDE) - PROPOSED Drawing · 24 Aug 2026 View ↗ PDF PROPOSED SITE PLAN Drawing · 24 Aug 2026 View ↗ PDF ELEVATION (SIDE) - PROPOSED Drawing · 24 Aug 2026 View ↗ PDF ELEVATION (FRONT) - PROPOSED Drawing · 24 Aug 2026 View ↗ PDF PROPOSED FIRST FLOOR Drawing · 24 Aug 2026 View ↗ PDF ELEVATION (REAR) - PROPOSED Drawing · 24 Aug 2026 View ↗ PDF PROPOSED GROUND FLOOR Drawing · 24 Aug 2026 View ↗ PDF ELEVATION (SIDE) - EXISTING Drawing · 24 Aug 2026 View ↗ PDF EXISTING LOFT Drawing · 24 Aug 2026 View ↗ PDF ELEVATION (SIDE) - EXISTING Drawing · 24 Aug 2026 View ↗ PDF EXISTING SITE PLAN Drawing · 24 Aug 2026 View ↗ PDF ELEVATION (REAR) - EXISTING Drawing · 24 Aug 2026 View ↗ PDF EXISTING FIRST FLOOR Drawing · 24 Aug 2026 View ↗ PDF ELEVATION (FRONT) - EXISTING Drawing · 24 Aug 2026 View ↗ PDF EXISTING GROUND FLOOR Drawing · 24 Aug 2026 View ↗

Application forms 1

PDF APPLICATION FORM - WITHOUT PERSONAL DATA Application Form · 24 Aug 2026 View ↗

Other documents 1

PDF ISSUE SHEET Application Document · 24 Aug 2026 View ↗

All documents on the council site ↗

Site constraints 4

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 Named permitted development rights are withdrawn here.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; Public transport access: PTAL 4 (good), TfL 2023, for the 100 m square.
Not affected
Outside flood zones 2 and 3 · Not green belt · No listed building 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 £1,850,000 in November 2020. Detached house, freehold.

5 November 2020£1,850,000

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

Building

Floor area305 m² (3,283 sq ft)
Energy ratingD (61 out of 100), could reach C
PropertyDetached house, 10 habitable rooms
Built1950 to 1966
HeatingWarm air, mains gas
WallsCavity wall, as built, no insulation (assumed)

From the energy performance certificate lodged in May 2014, 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
Proposed Lawful Development Certificate
Postcode
N20 9AR
Received
24 Aug 2026
Validated
25 Aug 2026
Ward
Whetstone
Case officer
Show
Target decision
20 Oct 2026
Decision
Unlawful
Decision date
18 Sept 2026
Decision level
Delegated Decision
Applicant
Show
Agent
Simon Miller Architects Ltd

How this decision compares

Decided in 24 days from validation, 28 days faster than Barnet's median of 52 for extensions. Refused, as 25% 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 →

Public comments

No public comments yet.

Last counted 22 Sept 2026

Read the comments on the council site ↗

Consultation & key dates

Alt. reference
PP-15014508
Planning Portal ref
PP-15014508
Statutory expiry
20 Oct 2026

Historical activity at this location

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

Within ~100m

Nearby activity

2025
Side Of 35 Oakleigh Park North London N20 9AN
Installation of 1no. 10m wooden pole
25/3349/LIC
2024 Approved
11 Oakleigh Park North London N20 9AN
1x Horse Chestnut (applicants Ref. T1) - Reduce by Approx 2-3m back to previouspruning po…
TPP/0343/24
2023 Approved
Greenleaf Court 17 Oakleigh Park North London N20 9AQ
3 x Ash (applicants ref. T1, T2, T3) - Reduce height by 7-8m to mitigate further limb fai…
TPP/0098/23
2023 Approved
Greenleaf Court 17 Oakleigh Park North London N20 9AQ
1 x Ash - Remove. Standing in T83 of Tree Preservation Order. (5 Day Notice)
TPP/0120/23
2022 Approved
11 Oakleigh Park North London N20 9AN
1 x Horse Chestnurt (applicants ref. T1) - Reduce back to previous pruning points. Standi…
TPP/0422/22
2022 Approved
13 Oakleigh Park North London N20 9AN
1 x Ash (applicants ref. T5) - Cut back overhang to clear. Standing in Group G58 of Tree…
TPP/0515/22
2021 Approved
30 Oakleigh Park North London N20 9AR
Part single, part two storey rear extension; part single, part two storey front extension…
21/4514/HSE
2021 Approved
41 Oakleigh Avenue London N20 9JE
Erection of a rear outbuilding
21/6715/192
2021 Approved
28 Oakleigh Park North London N20 9AR
Interior refurbishment of the property including insertion of a window at the rear of the…
21/4958/HSE
2021 Approved
41 Oakleigh Avenue London N20 9JE
First floor rear extension. Demolition and rebuild of existing roof including side dormer…
21/4657/HSE
2020 Withdrawn
28 Oakleigh Park North London N20 9AR
Demolition of existing rear garage and rear boiler room extension. New side garage. Insta…
20/5669/HSE
2021 Withdrawn
39 Oakleigh Avenue London N20 9JE
Roof extension involving side and rear dormer windows. Part single, part two storey side…
21/3786/HSE
2021 Approved
Greenleaf Court 17 Oakleigh Park North London N20 9AQ
3 x Acer (applicant's ref. G1) - Reduce height by 3m and sides by 1m all round to balance…
TPP/0280/21
2020 Approved
37 Oakleigh Avenue London N20 9JE
Single storey rear extension
20/4978/192
2020 Approved
37 Oakleigh Avenue London N20 9JE
Part single part two storey rear and side extension following demolition of existing cons…
20/1570/HSE
2019 Approved
11 Oakleigh Park North London N20 9AN
1 x Horse Chestnut (applicant's ref. T1) - Reduce back to previous points 2m approx. leav…
TPF/0571/19
2018 Approved
45 Oakleigh Avenue London N20 9JE
New boundary wall and metal gates
18/5285/HSE
2018 Approved
10 Oakleigh Park North London N20 9AR
Erection of a garden studio
18/4455/192
2017 Approved
45 Oakleigh Avenue London N20 9JE
Two storey front extension, garage conversion and alterations to doors and windows. Loft…
17/0208/HSE
2017 Approved
45 Oakleigh Avenue London N20 9JE
Extensions to roof including removal of existing rear dormer and insertion of new larger…
17/0259/192
2016 Approved
9A Oakleigh Park North London N20 9AN
1 x Fallen Ash - Remove. T95 of Tree Preservation Order
TPF/0014/17
2016 Approved
8 Oakleigh Park North Whetstone London N20 9AR
1 x Beech (applicant's ref. T1) - Reduce branches growing over No.6 Oakleigh Park North a…
TPP/0640/16
2016 Approved
10 Oakleigh Park North London N20 9AR
1 x Beech - Reduce 8 lower limbs (diameter approx. 2-3 inches) by 1.5 metres. T99 of Tree…
TPP/0565/16
2016 Approved
11 Oakleigh Park North London N20 9AN
1 x Horse Chestnut - Reduce to previous pruning points as specified. Standing in group G6…
TPP/0380/16
2016 Refused
45 Oakleigh Avenue London N20 9JE
Demolition of existing dwelling and construction of new dwelling with rooms in roofspace.
16/3014/FUL
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.

Freehold boundary: © Crown copyright and database rights 2026, HM Land Registry. Polygons © Crown copyright and database rights 2026 Ordnance Survey 100026316. Conditions of use

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.