Postcode record · Barnet
N3 3NB.
N3 3NB has 28 known premises and 17 planning records — 6 approved of 17 decided (35.3%). 15 EPC records.
Postcode N3 3NB · boundary not held, centred on the postcodeApprovedRefusedOther17 exact17 on the map — every match
At a glance · this postcodeBarnet profile →
28
Premises
known addresses (UPRNs)
17
Applications
17 decided
35.3%
Approval rate
6 approved · 8 refused
15
EPC records
ratings B 1 · C 4 · D 3 · E 7
17
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 3NB has 28 known premises and 17 planning records — 6 approved of 17 decided (35.3%). 15 EPC records.
Premises (18 of 28 shown)
Name
Details
UPRN 200083346
UPRN 200083363
UPRN 200083365
UPRN 200083369
UPRN 200083371
UPRN 200083373
UPRN 200083375
UPRN 200083377
UPRN 200083379
UPRN 200133555
UPRN 200083346
UPRN 200083363
UPRN 200083365
Show all 10 rows
UPRN 200083369
UPRN 200083371
UPRN 200083373
UPRN 200083375
UPRN 200083377
UPRN 200083379
UPRN 200133555
Planning
What happened?
17 planning applications across the postcode; 6 approved of 17 decided (35.3%). Latest 17 shown.
Reference
Proposal · address
Type
Outcome
Date · distance
Conversion of existing 2no. dwellings into 4no. self-contained flats, including: Part single, part two storey rear extension; Roof extension involving creation of new mansard roof; Alterations to and conversion of existing garage to provide refuse and cycle storage; Provision of associated amenity space and off-street parking
2 And 2A Mountfield Road London N3 3NB · premises record
Full Application
Withdrawn
2025-11-07
Submission of details of conditions 3 (Sound insulation test certificates) 4 (Refuse/recycling) 8 (Construction management plan) pursuant to planning permission 18/5500/FUL dated 22/05/2019
8 Mountfield Road London N3 3NB · premises record
Conditions
Approved
2021-07-29
Ground floor and first floor rear extension. Roof extension to existing rear outrigger to create 1no. additional self-contained flat with associated amenity space. Alterations to fenestration. [AMENDED DESCRIPTION]
10 Mountfield Road London N3 3NB · premises record
Full Application
Refused
2019-04-12
Conversion of existing flat at basement and ground floor levels into 2no. duplex flats including extension to existing basement level with associated internal alterations and changes to side and rear fenestration. Provision of lightwells to front, side and rear
8 Mountfield Road London N3 3NB · premises record
Full Application
Refused
2018-09-10
Roof extension to existing rear outrigger to create 1no. additional self-contained flat
10 Mountfield Road London N3 3NB · premises record
Full Application
Refused
2018-05-01
Extension and conversion of existing basement habitable space to include a lightwell and conversion of existing ground floor flat to create 2no self contained flats. Associated alterations to fenestration and hard and soft landscaping including insertion of metal grill over lightwell to front elevation and new terrace with glass balustrade to rear garden. Provision of amenity space, cycle and refuse and recycling storage
8 Mountfield Road London N3 3NB · premises record
Full Application
Refused
2018-05-01
Extension and conversation of existing basement habitable space to include a lightwell and conversion of existing ground floor flat to create 2no self contained flats. Associated alterations to fenestration and hard and soft landscaping including insertion of metal grill over lightwell to front elevation and new terrace with glass balustrade to rear garden. Provision of amenity space, cycle and refuse and recycling storage
8 Mountfield Road London N3 3NB · premises record
Full Application
Withdrawn
2018-01-26
Roof extension to existing rear outrigger to create 1no. additional self-contained flat
10 Mountfield Road London N3 3NB · premises record
Full Application
Refused
2017-11-24
New vehicular access and hardstanding to front garden
8 Mountfield Road London N3 3NB · premises record
Applicant Mr Joel Phillips · Officer Agnes Wanja
Existing Lawful Development Certificate
Refused
2016-11-07
Single storey side extension
12 Mountfield Road London N3 3NB · premises record
Householder Application
Approved
2016-08-12
Conversion of existing 2no. dwellings into 4no. self-contained flats, including: Part single, part two storey rear extension; Roof extension involving creation of new mansard roof; Alterations to and conversion of existing garage to provide refuse and cycle storage; Provision of associated amenity space and off-street parking
2 And 2A Mountfield Road London N3 3NB · premises record
Withdrawn
2025-11-07
More
Full Application
Submission of details of conditions 3 (Sound insulation test certificates) 4 (Refuse/recycling) 8 (Construction management plan) pursuant to planning permission 18/5500/FUL dated 22/05/2019
8 Mountfield Road London N3 3NB · premises record
Approved
2021-07-29
More
Conditions
Ground floor and first floor rear extension. Roof extension to existing rear outrigger to create 1no. additional self-contained flat with associated amenity space. Alterations to fenestration. [AMENDED DESCRIPTION]
10 Mountfield Road London N3 3NB · premises record
Refused
2019-04-12
More
Full Application
Show all 10 rows
Conversion of existing flat at basement and ground floor levels into 2no. duplex flats including extension to existing basement level with associated internal alterations and changes to side and rear fenestration. Provision of lightwells to front, side and rear
8 Mountfield Road London N3 3NB · premises record
Refused
2018-09-10
More
Full Application
Roof extension to existing rear outrigger to create 1no. additional self-contained flat
10 Mountfield Road London N3 3NB · premises record
Refused
2018-05-01
More
Full Application
Extension and conversion of existing basement habitable space to include a lightwell and conversion of existing ground floor flat to create 2no self contained flats. Associated alterations to fenestration and hard and soft landscaping including insertion of metal grill over lightwell to front elevation and new terrace with glass balustrade to rear garden. Provision of amenity space, cycle and refuse and recycling storage
8 Mountfield Road London N3 3NB · premises record
Refused
2018-05-01
More
Full Application
Extension and conversation of existing basement habitable space to include a lightwell and conversion of existing ground floor flat to create 2no self contained flats. Associated alterations to fenestration and hard and soft landscaping including insertion of metal grill over lightwell to front elevation and new terrace with glass balustrade to rear garden. Provision of amenity space, cycle and refuse and recycling storage
8 Mountfield Road London N3 3NB · premises record
Withdrawn
2018-01-26
More
Full Application
Roof extension to existing rear outrigger to create 1no. additional self-contained flat
10 Mountfield Road London N3 3NB · premises record
Refused
2017-11-24
More
Full Application
New vehicular access and hardstanding to front garden
8 Mountfield Road London N3 3NB · premises record
Applicant Mr Joel Phillips · Officer Agnes Wanja
Refused
2016-11-07
More
Existing Lawful Development Certificate
Single storey side extension
12 Mountfield Road London N3 3NB · premises record
Approved
2016-08-12
More
Householder 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 28 premises each one covers.
Designation
Coverage
Article 4 Direction Area
Article 4 Small Houses in Multiple Occupation (HMO) Area 1 · reference A4D14A1 · covers 28 of 28 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 28 of 28 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 17 applications in this postcode — the party who applied, not the owner or occupier.
Name
Details
Applicant on 5 applications
Applicant on 3 applications
Applicant on 2 applications
Applicant on 2 applications
Applicant on 1 application
Applicant on 1 application
Applicant on 1 application
Agent on 4 applications
Agent on 3 applications
Agent on 2 applications
Applicant on 5 applications
Applicant on 3 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
Agent on 4 applications
Agent on 3 applications
Agent on 2 applications
Development
What could it become?
Planning precedent17 applications and 17 mapped decisions in this postcode — precedent for what has been permitted and refused here.
Energy15 EPC records; ratings B: 1, C: 4, D: 3, E: 7.
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.
No intent signal is currently recorded in this postcode.
Thinking about a project here?
Boundary: OS Postcode Unit areas (Ordnance Survey), 2026-08-14. Planning records: canonical stage2. EPC: EPC register. Premises: OS AddressBase / UPRN.