15 Cissbury Ring North London N12 7AL Data via plota.co.uk

26/2991/192 - Proposed Lawful Development Certificate Approved
Extensions & alterations

Proposal

Roof extension involving rear dormer window with juliette balcony, 3no. front facing rooflights and new side gable window. Ground floor alterations to fenestration including the insertion of a new side window, replacement of a rear door with a larger window, and a replacement flat roof (to match existing) over the existing single-storey rear extension with enlarged skylight Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
12 Aug 2026
✓
Approved
27 Aug 2026

Approved on 27 Aug 2026 · Delegated Decision · Last checked 29 Aug 2026

Documents 4

Decision & officer reports 1

PDF DN: LAWFUL 192 Decision Notice · 27 Aug 2026 View ↗

Plans & drawings 2

PDF THE LOCATION PLAN Site Location Plan · 12 Aug 2026 View ↗ PDF EXISTING/PROPOSED Drawing · 12 Aug 2026 View ↗

Application forms 1

PDF APPLICATION FORM - WITHOUT PERSONAL DATA Application Form · 12 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 Named permitted development rights are withdrawn here.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 1b (very poor), 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 3

Last sold for £1,036,000 in July 2025. Semi-detached house, freehold.

18 July 2025£1,036,000
24 May 2007£522,500
30 August 2002£330,000

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

Building

Floor area122 m² (1,313 sq ft)
Energy ratingD (63 out of 100), could reach B
PropertySemi-detached house, 5 habitable rooms
Built1930 to 1949
HeatingBoiler and radiators, mains gas
WallsSolid brick, as built, no insulation (assumed)

From the energy performance certificate lodged in March 2023, 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
N12 7AL
Received
12 Aug 2026
Validated
12 Aug 2026
Ward
Totteridge & Woodside
Case officer
Show
Target decision
7 Oct 2026
Decision
Lawful
Decision date
27 Aug 2026
Decision level
Delegated Decision
Applicant
Show
Agent
The Market Design and Build

How this decision compares

Decided in 15 days from validation, 37 days faster than Barnet's median of 52 for extensions. Approved, as 75% of extensions here are.

87%decided within 8 weeks
75%approved
1,752decided 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 29 Aug 2026

Read the comments on the council site ↗

Consultation & key dates

Alt. reference
PP-15151690
Planning Portal ref
PP-15151690
Statutory expiry
7 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
68 Lullington Garth London N12 7BY
Single storey side extension following demolition of the existing garage
25/3856/192
2023 Approved
55 Lullington Garth London N12 7BB
Part single, part two storey side and rear extension. Erection of a new rear canopy with…
23/0937/HSE
2023 Approved
7 Cissbury Ring North London N12 7AL
Single storey rear extension with 2no. roof lights following demolition of conservatory
23/1772/HSE
2023 Approved
37 Cissbury Ring North London N12 7AL
New front porch and pathway steps at the entrance (AMENDED PLANS AND DESCRIPTION)
23/0690/HSE
2023 Approved
7 Cissbury Ring North London N12 7AL
Roof extension including hip to gable, rear dormer window with juliette balcony, 2no. fro…
23/1686/192
2022 Approved
55 Lullington Garth London N12 7BB
Part single, part two storey side and rear extension. Erection of a new rear canopy with…
22/3092/HSE
2022 Approved
29 Cissbury Ring North London N12 7AL
Roof extension involving hip to gable, rear dormer window, 2no. front facing rooflights a…
22/5236/192
2022 Approved
37 Cissbury Ring North London N12 7AL
Single storey side/rear extension following demolition of existing garage.
22/2820/HSE
2022 Approved
52 Lullington Garth London N12 7BY
New raised rear terrace with associated glass balustrade and steps to garden
22/2306/HSE
2022 Approved
37 Cissbury Ring North London N12 7AL
Roof extension involving hip to gable, rear dormer with juliette balcony, 2no front facin…
22/2822/192
2022 Approved
62 Lullington Garth London N12 7BY
Single storey rear extension with 2no rooflights and single storey garage extension follo…
22/1304/HSE
2022 Refused
50 Lullington Garth London N12 7BY
single storey rear extension with a depth of 6.00 metres beyond the original rear wall, a…
22/1840/PNH
2022 Approved
62 Lullington Garth London N12 7BY
Roof extension involving hip to gable, rear dormer window with juliette balcony, 2no fron…
22/1303/192
2022 Approved
55 Lullington Garth London N12 7BB
Roof extension including hip to gable, rear dormer window, 3no. front facing rooflights a…
22/2061/192
2021 Approved
52 Lullington Garth London N12 7BY
Single storey rear extension with a proposed depth of 6 metres from original rear wall, e…
21/5093/PNH
2021 Refused
50 Lullington Garth London N12 7BY
Single storey rear extension with a proposed depth of 6 metres from original rear wall, e…
21/4035/PNH
2021 Approved
47 Cissbury Ring North London N12 7AL
Single storey side and rear extension
21/0946/HSE
2021 Approved
47 Cissbury Ring North London N12 7AL
Erection of a rear outbuilding
21/0945/192
2021 Approved
47 Cissbury Ring North London N12 7AL
Roof extension involving hip to gable, rear dormer window with juliette balcony, 2no fron…
21/0944/192
2020 Approved
32 Cissbury Ring North London N12 7AN
Single storey rear extension with a proposed depth of 6.00 metres from original rear wall…
20/5531/PNH
2016 Approved
45 Cissbury Ring North London N12 7AL
Extension to roof including hip to gable end and 1no rear dormer window
16/5828/192
2016 Approved
36 Cissbury Ring North London N12 7AH
Single storey front and side extension with associated changes to access. Single storey r…
16/5690/HSE
2016 Approved
14 Cissbury Ring North London N12 7AN
Single storey rear extension
16/1149/HSE
2016 Approved
14 Cissbury Ring North London N12 7AN
The construction of a hip to gable extension, rear dormer and 3 no. front rooflights to d…
16/0613/192
2016 Approved
20 Cissbury Ring North London N12 7AN
Extension to roof including hip to gable end, rear dormer window with Juliette balcony an…
16/0569/192
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.