Postcode record · Barnet
N3 1SN.
N3 1SN has 77 known premises and 56 planning records — 40 approved of 56 decided (71.4%). 45 EPC records.
Postcode N3 1SN · boundary not held, centred on the postcodeApprovedRefusedOther56 exact4 approximate60 on the map — every match
At a glance · this postcodeBarnet profile →
77
Premises
known addresses (UPRNs)
56
Applications
56 decided
71.4%
Approval rate
40 approved · 13 refused
45
EPC records
ratings B 1 · C 5 · D 24 · E 13 · F 2
60
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 1SN has 77 known premises and 56 planning records — 40 approved of 56 decided (71.4%). 45 EPC records.
Premises (18 of 77 shown)
Name
Details
UPRN 200049090
UPRN 200049098
UPRN 200049121
UPRN 200049135
UPRN 200049320
UPRN 200049380
UPRN 200050342
UPRN 200050864
UPRN 200106701
UPRN 200106702
UPRN 200049090
UPRN 200049098
UPRN 200049121
Show all 10 rows
UPRN 200049135
UPRN 200049320
UPRN 200049380
UPRN 200050342
UPRN 200050864
UPRN 200106701
UPRN 200106702
Planning
What happened?
56 planning applications across the postcode; 40 approved of 56 decided (71.4%). Latest 30 shown.
Reference
Proposal · address
Type
Outcome
Date · distance
Installation of new wooden fence
23 St Marys Avenue London N3 1SN · premises record
Officer Asha Chhabhaiya
Householder Application
Approved
2025-09-04
Single storey rear extension with 1no. rooflight
13B St Marys Avenue London N3 1SN · premises record
Full Application
Approved
2024-03-22
Roof extension involving hip to gable with rear dormer window, 3no front facing rooflights and 1no new roof-light in the existing pitched side roof and new side gable window. Enlargement of first floor rear window
21 St Marys Avenue London N3 1SN · premises record
Officer Vruti Parmar
Proposed Lawful Development Certificate
Approved
2024-02-28
Conversion of and front in-fill extension to an existing internal garage to form new habitable room (Amended Description).
21 St Marys Avenue London N3 1SN · premises record
Officer Bradley Carson
Householder Application
Approved
2024-02-28
Variation of condition 1 (Approved Plans) of planning permission reference 21/5028/FUL dated 16/06/22 for 'Demolition of existing house and the erection of a new two-storey plus rooms in roofspace semi-detached dwellinghouse. Associated amenity space, refuse storage and provision of off-street parking.' Variation to include alterations to the roof design, increase in front porch height, alterations to fenestration, amendments to part single, part two storey rear extension involving extension to depth and height, and the insertion of solar panels.
34 St Marys Avenue London N3 1SN · premises record
Vary/Remove condition/Minor Mtl Amnd
Refused
2023-07-28
Submission of details of condition 12 (Levels) pursuant to planning permission 21/5028/FUL dated 16/06/2022
34 St Marys Avenue London N3 1SN · premises record
Conditions
Approved
2023-03-07
Submission of details of conditions 3 (Materials) 5 (Cycle storage) 6 (refuse/recycling storage) 12 (Levels) pursuant to planning permission 21/5028/FUL dated 16/06/2022
34 St Marys Avenue London N3 1SN · premises record
Conditions
Split
2022-08-16
Submission of details of condition 4 (Demolition and Construction Management and Logistics Plan) pursuant to planning permission 21/5028/FUL dated 17/09/2021
34 St Marys Avenue London N3 1SN · premises record
—
Approved
2022-06-21
Part single, part two storey side extension and single storey rear extension following demolition of existing garage. Roof extension including 2no. rear dormer windows, 3no. rooflights to front and 1no. rooflight to side.
38 St Marys Avenue London N3 1SN · premises record
Officer Madara Tukisa
Householder Application
Approved
2022-04-28
Demolition of existing house and the erection of a new two-storey plus rooms in roofspace semi-detached dwellinghouse. Associated amenity space, refuse storage and provision of off-street parking
34 St Marys Avenue London N3 1SN · premises record
Officer Emily Bell
Full Application
Approved
2021-09-17
Installation of new wooden fence
23 St Marys Avenue London N3 1SN · premises record
Officer Asha Chhabhaiya
Approved
2025-09-04
More
Householder Application
Single storey rear extension with 1no. rooflight
13B St Marys Avenue London N3 1SN · premises record
Approved
2024-03-22
More
Full Application
Roof extension involving hip to gable with rear dormer window, 3no front facing rooflights and 1no new roof-light in the existing pitched side roof and new side gable window. Enlargement of first floor rear window
21 St Marys Avenue London N3 1SN · premises record
Officer Vruti Parmar
Approved
2024-02-28
More
Proposed Lawful Development Certificate
Show all 10 rows
Conversion of and front in-fill extension to an existing internal garage to form new habitable room (Amended Description).
21 St Marys Avenue London N3 1SN · premises record
Officer Bradley Carson
Approved
2024-02-28
More
Householder Application
Variation of condition 1 (Approved Plans) of planning permission reference 21/5028/FUL dated 16/06/22 for 'Demolition of existing house and the erection of a new two-storey plus rooms in roofspace semi-detached dwellinghouse. Associated amenity space, refuse storage and provision of off-street parking.' Variation to include alterations to the roof design, increase in front porch height, alterations to fenestration, amendments to part single, part two storey rear extension involving extension to depth and height, and the insertion of solar panels.
34 St Marys Avenue London N3 1SN · premises record
Refused
2023-07-28
More
Vary/Remove condition/Minor Mtl Amnd
Submission of details of condition 12 (Levels) pursuant to planning permission 21/5028/FUL dated 16/06/2022
34 St Marys Avenue London N3 1SN · premises record
Approved
2023-03-07
More
Conditions
Submission of details of conditions 3 (Materials) 5 (Cycle storage) 6 (refuse/recycling storage) 12 (Levels) pursuant to planning permission 21/5028/FUL dated 16/06/2022
34 St Marys Avenue London N3 1SN · premises record
Split
2022-08-16
More
Conditions
Submission of details of condition 4 (Demolition and Construction Management and Logistics Plan) pursuant to planning permission 21/5028/FUL dated 17/09/2021
34 St Marys Avenue London N3 1SN · premises record
Approved
2022-06-21
More
—
Part single, part two storey side extension and single storey rear extension following demolition of existing garage. Roof extension including 2no. rear dormer windows, 3no. rooflights to front and 1no. rooflight to side.
38 St Marys Avenue London N3 1SN · premises record
Officer Madara Tukisa
Approved
2022-04-28
More
Householder Application
Demolition of existing house and the erection of a new two-storey plus rooms in roofspace semi-detached dwellinghouse. Associated amenity space, refuse storage and provision of off-street parking
34 St Marys Avenue London N3 1SN · premises record
Officer Emily Bell
Approved
2021-09-17
More
Full Application
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 77 premises each one covers.
Designation
Coverage
Article 4 Direction Area
Article 4 Small Houses in Multiple Occupation (HMO) Area 1 · reference A4D14A1 · covers 77 of 77 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 77 of 77 premises. Some normally permitted changes may require planning permission.
Nearby postcodes and streets
Walk to the next area — linked where the Atlas has a record for it (pilot borough only for now).
People
Who is involved?
Named on the latest 30 applications in this postcode — the party who applied, not the owner or occupier.
Name
Details
Applicant on 2 applications
Applicant on 1 application
Applicant on 1 application
Applicant on 1 application
Applicant on 1 application
Agent on 2 applications
Agent on 1 application
Agent on 1 application
Agent on 1 application
Agent on 1 application
Applicant on 2 applications
Applicant on 1 application
Applicant on 1 application
Show all 10 rows
Applicant on 1 application
Applicant on 1 application
Agent on 2 applications
Agent on 1 application
Agent on 1 application
Agent on 1 application
Agent on 1 application
Development
What could it become?
Planning precedent56 applications and 60 mapped decisions in this postcode — precedent for what has been permitted and refused here.
Energy45 EPC records; ratings B: 1, C: 5, D: 24, E: 13, F: 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 ProOwnership, finance and market signals recorded at addresses in this postcode — each with date and source. Signals are evidence of change, not a prediction.
14 intent signals recorded in this postcode
Price decline · Appeal dismissed · Repeat sale · EPC F/G · Long hold · Ageing director · HMO licensed
Subscribe to see the signals →Boundary: OS Postcode Unit areas (Ordnance Survey), 2026-08-14. Planning records: canonical stage2. EPC: EPC register. Premises: OS AddressBase / UPRN.