Postcode record · Barnet
N3 3QX.
N3 3QX has 25 known premises and 29 planning records — 19 approved of 29 decided (65.5%). 11 EPC records.
Postcode N3 3QX · boundary not held, centred on the postcodeApprovedRefusedOther30 on the map — every match
At a glance · this postcodeBarnet profile →
25
Premises
known addresses (UPRNs)
29
Applications
29 decided
65.5%
Approval rate
19 approved · 7 refused
51 days
Median decision time
average 51 days · 28 dated decisions
11
EPC records
ratings B 1 · C 1 · D 6 · E 3
30
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 3QX has 25 known premises and 29 planning records — 19 approved of 29 decided (65.5%). 11 EPC records.
Premises (18 of 25 shown)
Name
Details
UPRN 200127209
UPRN 200127210
UPRN 200127213
UPRN 200127215
UPRN 200127217
UPRN 200127219
UPRN 200127221
UPRN 200127223
UPRN 200127225
UPRN 200127227
UPRN 200127209
UPRN 200127210
UPRN 200127213
Show all 10 rows
UPRN 200127215
UPRN 200127217
UPRN 200127219
UPRN 200127221
UPRN 200127223
UPRN 200127225
UPRN 200127227
Planning
What happened?
29 planning applications across the postcode; 19 approved of 29 decided (65.5%). Latest 29 shown.
Reference
Proposal · address
Type
Outcome
Date · distance
Erection of a timber refuse store and bike shed to the front garden. Installation of an electrical vehicular charging point
11 Windermere Avenue London N3 3QX · premises record
Officer Radhika Bedi
Householder Application
Approved
2026-03-06
Single storey side/rear extension. Changes to fenestration on the rear elevation with new juliette balconies on the first floor. Addition of solar panel to second floor roof. HVAC unit at ground floor rear.
11 Windermere Avenue London N3 3QX · premises record
Officer Kate Foster
Householder Application
Approved
2024-12-13
Roof extension involving hip to gable, rear dormer windows with juliette balcony, 1no.rooflight and new gable window, following the demolition of existing chimney (Amended description).
11 Windermere Avenue London N3 3QX · premises record
Officer Tabitha Hannam
Proposed Lawful Development Certificate
Approved
2024-08-07
Single storey rear conservatory (as amended)
3 Windermere Avenue London N3 3QX · premises record
Officer Tina Oliveira
Householder Application
Approved
2022-02-25
Roof extension involving hip to gable, rear dormer window, 3no front facing rooflights and new side gable window
29 Windermere Avenue London N3 3QX · premises record
Officer Olivia Becci
Proposed Lawful Development Certificate
Approved
2021-07-21
Single storey rear extension following demolition of existing ground floor conservatory
35 Windermere Avenue London N3 3QX · premises record
Officer Emily Bell
Householder Application
Approved
2020-06-03
Roof extension involving 2 side dormer, a rear hip to gable extension, 3no roof lights, 1no Juliette balcony and 4 side elevation windows. Removal of the rear pitched roof above the master bathroom
1 Windermere Avenue London N3 3QX · premises record
Officer Jade Gillespie
Proposed Lawful Development Certificate
Approved
2020-03-25
Roof extension involving 3 side dormer windows, a rear hip to gable extension, 3no rooflights, 1no juliette balcony and 4 side elevation windows and also removed rear roof above the master bathroom. The side windows will be obscure glass.
1 Windermere Avenue London N3 3QX · premises record
Officer Jade Gillespie
Proposed Lawful Development Certificate
Approved
2020-02-03
Demolition of existing conservatory to allow for the erection of new single storey rear extension with a proposed depth of 5.99 metres from original rear wall, eaves height of 3.00 metres and maximum height of 3.23 metres
35 Windermere Avenue London N3 3QX · premises record
Officer Jade Gillespie
Prior Notification (Householder)
Refused
2019-11-19
Roof extension involving hip to gable to both sides and rear dormer window with juliette balcony
35 Windermere Avenue London N3 3QX · premises record
Officer Emily Bell
Proposed Lawful Development Certificate
Approved
2019-11-18
Erection of a timber refuse store and bike shed to the front garden. Installation of an electrical vehicular charging point
11 Windermere Avenue London N3 3QX · premises record
Officer Radhika Bedi
Approved
2026-03-06
More
Householder Application
Single storey side/rear extension. Changes to fenestration on the rear elevation with new juliette balconies on the first floor. Addition of solar panel to second floor roof. HVAC unit at ground floor rear.
11 Windermere Avenue London N3 3QX · premises record
Officer Kate Foster
Approved
2024-12-13
More
Householder Application
Roof extension involving hip to gable, rear dormer windows with juliette balcony, 1no.rooflight and new gable window, following the demolition of existing chimney (Amended description).
11 Windermere Avenue London N3 3QX · premises record
Officer Tabitha Hannam
Approved
2024-08-07
More
Proposed Lawful Development Certificate
Show all 10 rows
Single storey rear conservatory (as amended)
3 Windermere Avenue London N3 3QX · premises record
Officer Tina Oliveira
Approved
2022-02-25
More
Householder Application
Roof extension involving hip to gable, rear dormer window, 3no front facing rooflights and new side gable window
29 Windermere Avenue London N3 3QX · premises record
Officer Olivia Becci
Approved
2021-07-21
More
Proposed Lawful Development Certificate
Single storey rear extension following demolition of existing ground floor conservatory
35 Windermere Avenue London N3 3QX · premises record
Officer Emily Bell
Approved
2020-06-03
More
Householder Application
Roof extension involving 2 side dormer, a rear hip to gable extension, 3no roof lights, 1no Juliette balcony and 4 side elevation windows. Removal of the rear pitched roof above the master bathroom
1 Windermere Avenue London N3 3QX · premises record
Officer Jade Gillespie
Approved
2020-03-25
More
Proposed Lawful Development Certificate
Roof extension involving 3 side dormer windows, a rear hip to gable extension, 3no rooflights, 1no juliette balcony and 4 side elevation windows and also removed rear roof above the master bathroom. The side windows will be obscure glass.
1 Windermere Avenue London N3 3QX · premises record
Officer Jade Gillespie
Approved
2020-02-03
More
Proposed Lawful Development Certificate
Demolition of existing conservatory to allow for the erection of new single storey rear extension with a proposed depth of 5.99 metres from original rear wall, eaves height of 3.00 metres and maximum height of 3.23 metres
35 Windermere Avenue London N3 3QX · premises record
Officer Jade Gillespie
Refused
2019-11-19
More
Prior Notification (Householder)
Roof extension involving hip to gable to both sides and rear dormer window with juliette balcony
35 Windermere Avenue London N3 3QX · premises record
Officer Emily Bell
Approved
2019-11-18
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 25 premises each one covers.
Designation
Coverage
Article 4 Direction Area
Article 4 Small Houses in Multiple Occupation (HMO) Area 1 · reference A4D14A1 · covers 25 of 25 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 25 of 25 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 29 applications in this postcode — the party who applied, not the owner or occupier.
Name
Details
Case officer on 3 applications
Case officer on 2 applications
Case officer on 2 applications
Case officer on 2 applications
Case officer on 1 application
Case officer on 1 application
Case officer on 1 application
Case officer on 1 application
Case officer on 1 application
Case officer on 1 application
Case officer on 3 applications
Case officer on 2 applications
Case officer on 2 applications
Show all 10 rows
Case officer on 2 applications
Case officer on 1 application
Case officer on 1 application
Case officer on 1 application
Case officer on 1 application
Case officer on 1 application
Case officer on 1 application
Development
What could it become?
Planning precedent29 applications and 30 mapped decisions in this postcode — precedent for what has been permitted and refused here.
Energy11 EPC records; ratings B: 1, C: 1, D: 6, E: 3.
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.
Boundary: OS Postcode Unit areas (Ordnance Survey), 2026-08-14. Planning records: canonical stage2. EPC: EPC register. Premises: OS AddressBase / UPRN.