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Planning Atlas›Barnet›…West Finchley ward›N3 1LG
AtlasBarnetWest FinchleyN3 1LG
Postcode record · Barnet

N3 1LG.

N3 1LG has 23 known premises and 20 planning records — 15 approved of 20 decided (75%). 16 EPC records.

Postcode N3 1LG · boundary not held, centred on the postcodeApprovedRefusedOther20 exact20 on the map — every match
At a glance · this postcodeBarnet profile →
23
Premises
known addresses (UPRNs)
20
Applications
20 decided
75%
Approval rate
15 approved · 4 refused
16
EPC records
ratings C 7 · D 7 · E 2
20
Mapped applications
inside the postcode shape
Postcode unit boundary from Ordnance Survey; premises and applications inside it. Aggregates describe the area, not any single premises.
Property

What is it?

N3 1LG has 23 known premises and 20 planning records — 15 approved of 20 decided (75%). 16 EPC records.

Premises (18 of 23 shown)

Name
Details
UPRN 200027133
UPRN 200027156
UPRN 200027158
UPRN 200027162
UPRN 200027164
UPRN 200027165
UPRN 200027166
UPRN 200027167
UPRN 200027168
UPRN 200027169
UPRN 200027133
UPRN 200027156
UPRN 200027158
Show all 10 rows
UPRN 200027162
UPRN 200027164
UPRN 200027165
UPRN 200027166
UPRN 200027167
UPRN 200027168
UPRN 200027169
Planning

What happened?

20 planning applications across the postcode; 15 approved of 20 decided (75%). Latest 20 shown.

Reference
Proposal · address
Type
Outcome
Date · distance
Single storey rear extension following demolition of the existing sun room. Roof extension involving rear dormer windows and 4no. front facing rooflights
37 Cornwall Avenue London N3 1LG · premises record
Householder
Approved
2026-03-12
Roof extension involving hip to gable, rear dormer window and 3no. front facing rooflights
39 Cornwall Avenue London N3 1LG · premises record
Applicant Mr Raphael Femi Lewu · Agent Mehra Designs · Officer Joe Davies
Proposed Lawful Development Certificate
Approved
2025-12-22
Conversion of the existing dwelling into 2no. self-contained flats including single storey rear extension with green roof and parapet, front porch infill, first floor rear terrace area with obscure glazing, roof extension involving rear dormer window and 4no. front facing rooflights
37 Cornwall Avenue London N3 1LG · premises record
Full Application
Refused
2025-11-14
Single storey rear extension. Conversion of the existing garage into habitable room, insertion of window to replace the garage door
39 Cornwall Avenue London N3 1LG · premises record
Householder Application
Approved
2025-09-17
Roof extension involving rear dormer window and 4no. front facing rooflights
37 Cornwall Avenue London N3 1LG · premises record
Proposed Lawful Development Certificate
Approved
2025-07-15
Single storey rear extension with a proposed depth of 6.00 metres, maximum height of 3.38 metres and eaves height of 3.00 metres. Following demolition of existing outrigger and extension.
37 Cornwall Avenue London N3 1LG · premises record
Prior Notification (Householder)
Withdrawn
2025-06-17
Roof extension with rear dormer windows with 4no. front facing rooflights. Front porch infill
37 Cornwall Avenue London N3 1LG · premises record
Proposed Lawful Development Certificate
Refused
2025-06-16
Roof extension including rear dormer window with 2no. juliette balconies and 3no. front facing rooflights following the removal of 4no existing chimney stack. New front porch (Amended Description)
31 Cornwall Avenue London N3 1LG · premises record
Proposed Lawful Development Certificate
Approved
2024-05-10
Single storey front extension with 2no. rooflights. Single storey rear extension with pitched roof and 6no. rooflights following the demolition of existing conservatory. Changes to fenestration
31 Cornwall Avenue London N3 1LG · premises record
Householder Application
Approved
2024-05-10
Erection of a single storey outbuilding in rear garden
22 Cornwall Avenue London N3 1LG · premises record
Proposed Lawful Development Certificate
Approved
2020-04-08
Single storey rear extension following demolition of the existing sun room. Roof extension involving rear dormer windows and 4no. front facing rooflights
37 Cornwall Avenue London N3 1LG · premises record
Approved
2026-03-12
More
Householder
Roof extension involving hip to gable, rear dormer window and 3no. front facing rooflights
39 Cornwall Avenue London N3 1LG · premises record
Applicant Mr Raphael Femi Lewu · Agent Mehra Designs · Officer Joe Davies
Approved
2025-12-22
More
Proposed Lawful Development Certificate
Conversion of the existing dwelling into 2no. self-contained flats including single storey rear extension with green roof and parapet, front porch infill, first floor rear terrace area with obscure glazing, roof extension involving rear dormer window and 4no. front facing rooflights
37 Cornwall Avenue London N3 1LG · premises record
Refused
2025-11-14
More
Full Application
Show all 10 rows
Single storey rear extension. Conversion of the existing garage into habitable room, insertion of window to replace the garage door
39 Cornwall Avenue London N3 1LG · premises record
Approved
2025-09-17
More
Householder Application
Roof extension involving rear dormer window and 4no. front facing rooflights
37 Cornwall Avenue London N3 1LG · premises record
Approved
2025-07-15
More
Proposed Lawful Development Certificate
Single storey rear extension with a proposed depth of 6.00 metres, maximum height of 3.38 metres and eaves height of 3.00 metres. Following demolition of existing outrigger and extension.
37 Cornwall Avenue London N3 1LG · premises record
Withdrawn
2025-06-17
More
Prior Notification (Householder)
Roof extension with rear dormer windows with 4no. front facing rooflights. Front porch infill
37 Cornwall Avenue London N3 1LG · premises record
Refused
2025-06-16
More
Proposed Lawful Development Certificate
Roof extension including rear dormer window with 2no. juliette balconies and 3no. front facing rooflights following the removal of 4no existing chimney stack. New front porch (Amended Description)
31 Cornwall Avenue London N3 1LG · premises record
Approved
2024-05-10
More
Proposed Lawful Development Certificate
Single storey front extension with 2no. rooflights. Single storey rear extension with pitched roof and 6no. rooflights following the demolition of existing conservatory. Changes to fenestration
31 Cornwall Avenue London N3 1LG · premises record
Approved
2024-05-10
More
Householder Application
Erection of a single storey outbuilding in rear garden
22 Cornwall Avenue London N3 1LG · premises record
Approved
2020-04-08
More
Proposed Lawful Development Certificate

Building control

Building-control records are not yet collected for Barnet — the register is being gathered borough by borough (held so far: Lambeth, Brent, Ealing, Westminster, City and others).

Place

What affects it?

Every mapped designation touching a premises in this postcode, with how many of its 23 premises each one covers.

Designation
Coverage
Article 4 Direction Area
Article 4 Small Houses in Multiple Occupation (HMO) Area 1 · reference A4D14A1 · covers 23 of 23 premises. Some normally permitted changes may require planning permission.
Article 4 Direction Area
Article 4 Small Houses in Multiple Occupation (HMO) Area 1 · reference A4D14A1 · covers 23 of 23 premises. Some normally permitted changes may require planning permission.
People

Who is involved?

Named on the latest 20 applications in this postcode — the party who applied, not the owner or occupier.

Name
Details
Applicant on 2 applications
Applicant on 2 applications
Applicant on 2 applications
Applicant on 2 applications
Applicant on 1 application
Applicant on 1 application
Applicant on 1 application
Applicant on 1 application
Applicant on 1 application
Applicant on 1 application
Applicant on 2 applications
Applicant on 2 applications
Applicant on 2 applications
Show all 10 rows
Applicant on 2 applications
Applicant on 1 application
Applicant on 1 application
Applicant on 1 application
Applicant on 1 application
Applicant on 1 application
Applicant on 1 application
Development

What could it become?

Planning precedent20 applications and 20 mapped decisions in this postcode — precedent for what has been permitted and refused here.
Energy16 EPC records; ratings C: 7, D: 7, E: 2.
What is not assertedNo capacity, value or ownership claim is made at area level; those belong to individual premises records and their evidence.

Intent signals

Planning Atlas Pro

Ownership, finance and market signals recorded at addresses in this postcode — each with date and source. Signals are evidence of change, not a prediction.

2 intent signals recorded in this postcode
Price decline
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Boundary: OS Postcode Unit areas (Ordnance Survey), 2026-08-14. Planning records: canonical stage2. EPC: EPC register. Premises: OS AddressBase / UPRN.
N3 1LG, Barnet: Planning and Property History | Planning Atlas