27 The Birches London N21 1NJ Data via plota.co.uk

26/01124/CEA - Cert of Lawful Use/Operation - Proposed Approved
Extensions & alterations

Proposal

Extension to roof at side to form gable end with replacement rear dormer, Juliette balcony and front rooflights, with additional window at side elevation and detached outbuilding at rear. Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
20 Mar 2026
✓
Validated
30 Mar 2026
✓
Approved
7 May 2026

Approved on 7 May 2026 · Delegated Decision · Last checked 6 Jul 2026

Documents 4

Decision & officer reports 2

PDF Officer Report Officer Report · 8 May 2026 View ↗ PDF Decision Notice Decision Notice · 7 May 2026 View ↗

Application forms 1

PDF Application Form - Without Personal Data Application Form - Without Personal Data · 20 Mar 2026 View ↗

Other documents 1

PDF ROOF VOLUME CALCULATIONS Supporting Information · 20 Mar 2026 View ↗

All documents on the council site ↗

Site constraints 4

Article 4 direction
Borough wide. Named permitted development rights are withdrawn here.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: Enfield 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 ↗
Habitat network: Network Enhancement Zone 2
Where habitat is joined up enough to work as a network. Context, not a constraint on its own.
Also on the record
Inside the Enfield built-up area.
Not affected
Outside flood zones 2 and 3 · Not green belt · No scheduled monument 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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Important details

Council
Enfield
Application type
Cert of Lawful Use/Operation - Proposed
Postcode
N21 1NJ
Received
20 Mar 2026
Validated
30 Mar 2026
Ward
Southgate
Case officer
Show
Target decision
25 May 2026
Decision
Granted
Decision date
7 May 2026
Decision level
Delegated Decision
Applicant
Show
Agent
CASA Architecture + Design

How this decision compares

Decided in 38 days from validation, 8 days faster than Enfield's median of 46 for extensions. Approved, as 79% of extensions here are.

91%decided within 8 weeks
79%approved
1,118decided in the last year

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

Consultation & key dates

Alt. reference
PP-14796624
Env. assessment
No

Historical activity at this location

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

Within ~100m

Nearby activity

2022 Approved
22 The Birches London N21 1NL
Two storey side extension and single storey rear extension together with rear dormer with…
22/03796/HOU
2022 Approved
14 Holly Hill London N21 1NP
Single storey rear extension together with demolition of detached garage at rear and erec…
22/00921/HOU
2021 Withdrawn
The Birches 22 Winchmore Hill London N21 1NL
Two storey side extension and single storey rear extension together with rear dormer with…
21/04789/HOU
2020 Approved
26 The Birches London N21 1NL
Single storey side extension incorporating replacement garage together with conversion of…
20/03737/HOU
2019 Refused
28 The Birches London N21 1NL
First floor rear extension, creation of a basement level with courtyard to rear.
19/04208/HOU
2019 Refused
28 The Birches London N21 1NL
Creation of basement with rear court.
19/02794/HOU
2019 Approved
28 The Birches London N21 1NL
First floor rear extension.
19/01740/HOU
2019 Approved
18 Holly Hill London N21 1NP
Construction of a single storey rear extension, submitted pursuant to prior approval ref…
19/00356/CEA
2018 Refused
18 Holly Hill London N21 1NP
Extension to roof at side to form gable end with rear dormer, patio doors, Juliette balco…
18/04098/HOU
2018 Approved
18 Holly Hill London N21 1NP
Single storey rear extension 4m deep x 3.1m high (3.1m high to eaves).
18/04143/PRH
2018 Approved
16 Holly Hill London N21 1NP
Single storey rear extension.
18/01125/CEA
2018 Approved
17 The Birches London N21 1NJ
First floor rear extension.
18/01237/HOU
2017 Refused
17 The Birches London N21 1NJ
First floor rear extension.
17/05011/HOU
2017 Approved
15 The Birches London N21 1NJ
Extension to roof at side to form gable end with rear dormer, front rooflights and Juliet…
17/03951/CEA
2017 Refused
17 The Birches London N21 1NJ
First floor rear extension.
17/03050/HOU
2017 Approved
19 Holly Hill London N21 1NN
Single storey rear extension with glass balustrade and lower ground basement extension wi…
17/02553/HOU
2017 Approved
17 The Birches London N21 1NJ
Extension to roof at side to form gable end, rear dormer with front rooflights.
17/01383/CEA
2016 Approved
21 Holly Hill London N21 1NN
Single storey rear extension, new basement and terrace at rear.
16/05713/HOU
2016 Approved
23 The Birches London N21 1NJ
Erection of single storey and first floor rear extensions, installation of 3 x windows to…
16/03730/HOU
2016 Approved
15 The Birches London N21 1NJ
First floor rear extension.
16/00945/HOU
Enfield
Planning Authority Score
6.9/10
Good
#65 of 296 councils
Relevant to this application:
Householder decisions

Enfield is one of the fastest councils in England for householder decisions, ranking #15 out of 296. Only 5% of applications have the time limit extended, well below the 41% national average - the council usually decides on time. Enfield is also one of the strictest councils - it refuses more householder applications than almost any other, with only 83% approved vs 90% nationally.

Among the fastest councils in England
for householder decisions
These figures are council-wide context, not a prediction for this application. View full council performance
Enfield decision statistics
Based on MHCLG data, the year to March 2026
78%
Overall approval rate
Below avg (87%) #271 of 296
83%
Householder approved
Below avg (90%) #260 of 296
90%
Decided in 8 weeks
Above avg (63%) #15 of 296
5%
Extended time limit
Below avg (41%) #1 of 296
60%
Minor dwellings approved
265 decided (1-9 homes)
63%
Major dwellings approved
8 decided (10+ homes)
72%
Change of use approved
322 decided
1,939
Total decisions
433 refused in the year to March 2026
Source: MHCLG planning statistics · See full council rankings