Postcode record · Barnet
N12 9JA.
N12 9JA has 15 known premises and 21 planning records — 16 approved of 21 decided (76.2%). 8 EPC records.
Postcode N12 9JA · boundary not held, centred on the postcodeApprovedRefusedOther21 exact21 on the map — every match
At a glance · this postcodeBarnet profile →
15
Premises
known addresses (UPRNs)
21
Applications
21 decided
76.2%
Approval rate
16 approved · 0 refused
8
EPC records
ratings C 4 · D 3 · F 1
21
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?
N12 9JA has 15 known premises and 21 planning records — 16 approved of 21 decided (76.2%). 8 EPC records.
Premises
Name
Details
UPRN 200079992
UPRN 200079994
UPRN 200079996
UPRN 200079998
UPRN 200080000
UPRN 200080002
UPRN 200080004
UPRN 200080006
UPRN 200080008
UPRN 200080010
UPRN 200079992
UPRN 200079994
UPRN 200079996
Show all 10 rows
UPRN 200079998
UPRN 200080000
UPRN 200080002
UPRN 200080004
UPRN 200080006
UPRN 200080008
UPRN 200080010
Planning
What happened?
21 planning applications across the postcode; 16 approved of 21 decided (76.2%). Latest 21 shown.
Reference
Proposal · address
Type
Outcome
Date · distance
Erection of a garden room with solar panels to roof following demolition of the existing garage
18 Mayfield Avenue London N12 9JA · premises record
Householder Application
Approved
2022-10-28
Single storey rear extension following demolition of the existing conservatory
2 Mayfield Avenue London N12 9JA · premises record
Proposed Lawful Development Certificate
Approved
2020-02-11
Single storey rear extension with a proposed depth of 6.00 metres from original rear wall, eaves height of 2.94 metres and maximum height of 3.90 metres
2 Mayfield Avenue London N12 9JA · premises record
Prior Notification (Householder)
Not required
2019-12-24
Single storey side extension with associated alterations to fenestration. Provision of refuse and recycling storage
2 Mayfield Avenue London N12 9JA · premises record
Householder Application
Approved
2018-07-25
Part single, part two storey rear extension. New patio area
18 Mayfield Avenue London N12 9JA · premises record
Householder Application
Approved
2017-08-15
Extension to roof including hip to gable end, 1no rear dormer and 2no roof lights to front elevation and insertion of new window to side elevation
18 Mayfield Avenue London N12 9JA · premises record
Proposed Lawful Development Certificate
Approved
2017-02-09
Single storey rear extension
18 Mayfield Avenue London N12 9JA · premises record
Householder Application
Approved
2017-02-09
Single storey rear extension. Roof extension including rear dormer to facilitate a loft conversion.
12 Mayfield Avenue, London, N12 9JA · premises record
Proposed Lawful Development Certificate
Approved
2008-12-15
Single storey rear extension.
10 Mayfield Avenue London N12 9JA · premises record
Applicant Guy Nevill
Proposed Lawful Development Certificate
Approved
2006-02-01
Single storey rear extension. New front porch.
4 Mayfield Avenue London N12 9JA · premises record
Applicant Dr Evans Aina · Officer Fabien Peterson
Full Application
Approved
2004-10-18
Erection of a garden room with solar panels to roof following demolition of the existing garage
18 Mayfield Avenue London N12 9JA · premises record
Approved
2022-10-28
More
Householder Application
Single storey rear extension following demolition of the existing conservatory
2 Mayfield Avenue London N12 9JA · premises record
Approved
2020-02-11
More
Proposed Lawful Development Certificate
Single storey rear extension with a proposed depth of 6.00 metres from original rear wall, eaves height of 2.94 metres and maximum height of 3.90 metres
2 Mayfield Avenue London N12 9JA · premises record
Not required
2019-12-24
More
Prior Notification (Householder)
Show all 10 rows
Single storey side extension with associated alterations to fenestration. Provision of refuse and recycling storage
2 Mayfield Avenue London N12 9JA · premises record
Approved
2018-07-25
More
Householder Application
Part single, part two storey rear extension. New patio area
18 Mayfield Avenue London N12 9JA · premises record
Approved
2017-08-15
More
Householder Application
Extension to roof including hip to gable end, 1no rear dormer and 2no roof lights to front elevation and insertion of new window to side elevation
18 Mayfield Avenue London N12 9JA · premises record
Approved
2017-02-09
More
Proposed Lawful Development Certificate
Single storey rear extension
18 Mayfield Avenue London N12 9JA · premises record
Approved
2017-02-09
More
Householder Application
Single storey rear extension. Roof extension including rear dormer to facilitate a loft conversion.
12 Mayfield Avenue, London, N12 9JA · premises record
Approved
2008-12-15
More
Proposed Lawful Development Certificate
Single storey rear extension.
10 Mayfield Avenue London N12 9JA · premises record
Applicant Guy Nevill
Approved
2006-02-01
More
Proposed Lawful Development Certificate
Single storey rear extension. New front porch.
4 Mayfield Avenue London N12 9JA · premises record
Applicant Dr Evans Aina · Officer Fabien Peterson
Approved
2004-10-18
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 15 premises each one covers.
Designation
Coverage
Article 4 Direction Area
Article 4 Small Houses in Multiple Occupation (HMO) Area 1 · reference A4D14A1 · covers 15 of 15 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 15 of 15 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 21 applications in this postcode — the party who applied, not the owner or occupier.
Name
Details
Applicant on 4 applications
Applicant on 3 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
Agent on 3 applications
Applicant on 4 applications
Applicant on 3 applications
Applicant on 2 applications
Show all 10 rows
Applicant on 1 application
Applicant on 1 application
Applicant on 1 application
Applicant on 1 application
Applicant on 1 application
Applicant on 1 application
Agent on 3 applications
Development
What could it become?
Planning precedent21 applications and 21 mapped decisions in this postcode — precedent for what has been permitted and refused here.
Energy8 EPC records; ratings C: 4, D: 3, F: 1.
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.
4 intent signals recorded in this postcode
Repeat sale · EPC F/G · Long hold
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.