Postcode record · Harrow
HA1 4AJ.
HA1 4AJ has 22 known premises and 23 planning records — 17 approved of 19 decided (89.5%). 10 EPC records.
Postcode HA1 4AJ · boundary not held, centred on the postcodeApprovedRefusedOther23 exact23 on the map — every match
At a glance · this postcodeHarrow profile →
22
Premises
known addresses (UPRNs)
23
Applications
19 decided
89.5%
Approval rate
17 approved · 2 refused
10
EPC records
ratings D 8 · E 2
23
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?
HA1 4AJ has 22 known premises and 23 planning records — 17 approved of 19 decided (89.5%). 10 EPC records.
Premises (18 of 22 shown)
Name
Details
UPRN 100021291506
UPRN 100021291508
UPRN 100021291510
UPRN 100021291512
UPRN 100021291514
UPRN 100021291516
UPRN 100021291518
UPRN 100021291520
UPRN 100021291522
UPRN 100021291524
UPRN 100021291506
UPRN 100021291508
UPRN 100021291510
Show all 10 rows
UPRN 100021291512
UPRN 100021291514
UPRN 100021291516
UPRN 100021291518
UPRN 100021291520
UPRN 100021291522
UPRN 100021291524
Planning
What happened?
23 planning applications across the postcode; 17 approved of 19 decided (89.5%). Latest 23 shown.
Reference
Proposal · address
Type
Outcome
Date · distance
Certificate of Lawful Development (Proposed): Change of use from C3 (Dwelling houses) to C4 (HMO for up to 6 persons)
14 Treve Avenue, West Harrow, Harrow, HA1 4AJ · premises record
Certificate of Lawful Development Proposed
Approved
2026-03-25
Single-storey front extension incorporating porch; two-storey side to rear extension; single-storey rear extension; external alterations; bin / cycle storage (demolition of attached garage and rear conservatory); Change of use from single dwelling (Class C3) to 7 bed HMO (Sui generis)
14 Treve Avenue, West Harrow, Harrow, HA1 4AJ · premises record
Full Planning Application
Withdrawn
2026-02-04
Single storey front extension incorporating porch; two storey side to rear extension; single storey rear extension; alterations to the roof to form rear dormer; roof light in front roof slope; external alterations (demolition of attached garage and rear conservatory)
14 Treve Avenue, West Harrow, Harrow, HA1 4AJ · premises record
Householder
Approved
2025-10-29
Single storey rear extension: 6.00 metres deep, 3.40 metres maximum height and 3.00 metres high to the eaves
14 Treve Avenue, West Harrow, Harrow, HA1 4AJ · premises record
Prior Notification - Larger Home Extension
Not required
2025-10-02
Single storey front extension incorporating front porch; single storey side to rear extension (Following Prior Approval Consent reference PL/1906/24) (Demolition of attached garage)
18 Treve Avenue, West Harrow, Harrow, HA1 4AJ · premises record
Agent Generative Design Partnership Ltd · Officer Ryan Gallagher
Householder
Approved
2024-09-02
Certificate of Lawful Proposed Development: Alterations to roof to form end gable and rear dormer with Juliette balcony, installation of two roof lights in front elevation and new window in end gable, Demolition of garage at side, Single storey side extension, New window in front elevation, New wind
18 Treve Avenue, West Harrow, Harrow, HA1 4AJ · premises record
Certificate of Lawful Development Proposed
Approved
2024-07-12
Single storey rear extension: 6.00 metres deep, 4.00 metres maximum height and 3.00 metres high to the eaves
18 Treve Avenue, West Harrow, Harrow, HA1 4AJ · premises record
Prior Notification - Larger Home Extension
Not required
2024-07-11
Certificate of lawful proposed development (proposed): Single Storey Rear Extension (following established prior approval under ref: P/4767/21/PRIOR)
32 Treve Avenue, West Harrow, Harrow, HA1 4AJ · premises record
Applicant Mr Andreas Karaiskos · Officer MOR Morgan Roberts
Certificate of Lawful Development Existing
Approved
2022-06-07
Single Storey Rear Extension: 6.00 metres deep, 3.78 metres maximum height, 3.00 metres high to the eaves
32 Treve Avenue, West Harrow, Harrow, HA1 4AJ · premises record
Applicant Mr Andreas Karaiskos · Officer ASP Asia Pineau
Prior Notification - Larger Home Extension
Not required
2021-12-02
CERTIFICATE OF LAWFUL DEVELOPMENT (PROPOSED):Alterations to roof to form an end gable, rear dormer. Insertion of three rooflights in front roofslope and the insertion of a rooflight on the side of the projecting pitched roof.
32 Treve Avenue, West Harrow, Harrow, HA1 4AJ · premises record
Applicant Mr A Karaiskos · Officer ROH Roberta Henriques
Certificate of Lawful Development Existing
Approved
2021-07-19
Certificate of Lawful Development (Proposed): Change of use from C3 (Dwelling houses) to C4 (HMO for up to 6 persons)
14 Treve Avenue, West Harrow, Harrow, HA1 4AJ · premises record
Approved
2026-03-25
More
Certificate of Lawful Development Proposed
Single-storey front extension incorporating porch; two-storey side to rear extension; single-storey rear extension; external alterations; bin / cycle storage (demolition of attached garage and rear conservatory); Change of use from single dwelling (Class C3) to 7 bed HMO (Sui generis)
14 Treve Avenue, West Harrow, Harrow, HA1 4AJ · premises record
Withdrawn
2026-02-04
More
Full Planning Application
Single storey front extension incorporating porch; two storey side to rear extension; single storey rear extension; alterations to the roof to form rear dormer; roof light in front roof slope; external alterations (demolition of attached garage and rear conservatory)
14 Treve Avenue, West Harrow, Harrow, HA1 4AJ · premises record
Approved
2025-10-29
More
Householder
Show all 10 rows
Single storey rear extension: 6.00 metres deep, 3.40 metres maximum height and 3.00 metres high to the eaves
14 Treve Avenue, West Harrow, Harrow, HA1 4AJ · premises record
Not required
2025-10-02
More
Prior Notification - Larger Home Extension
Single storey front extension incorporating front porch; single storey side to rear extension (Following Prior Approval Consent reference PL/1906/24) (Demolition of attached garage)
18 Treve Avenue, West Harrow, Harrow, HA1 4AJ · premises record
Agent Generative Design Partnership Ltd · Officer Ryan Gallagher
Approved
2024-09-02
More
Householder
Certificate of Lawful Proposed Development: Alterations to roof to form end gable and rear dormer with Juliette balcony, installation of two roof lights in front elevation and new window in end gable, Demolition of garage at side, Single storey side extension, New window in front elevation, New wind
18 Treve Avenue, West Harrow, Harrow, HA1 4AJ · premises record
Approved
2024-07-12
More
Certificate of Lawful Development Proposed
Single storey rear extension: 6.00 metres deep, 4.00 metres maximum height and 3.00 metres high to the eaves
18 Treve Avenue, West Harrow, Harrow, HA1 4AJ · premises record
Not required
2024-07-11
More
Prior Notification - Larger Home Extension
Certificate of lawful proposed development (proposed): Single Storey Rear Extension (following established prior approval under ref: P/4767/21/PRIOR)
32 Treve Avenue, West Harrow, Harrow, HA1 4AJ · premises record
Applicant Mr Andreas Karaiskos · Officer MOR Morgan Roberts
Approved
2022-06-07
More
Certificate of Lawful Development Existing
Single Storey Rear Extension: 6.00 metres deep, 3.78 metres maximum height, 3.00 metres high to the eaves
32 Treve Avenue, West Harrow, Harrow, HA1 4AJ · premises record
Applicant Mr Andreas Karaiskos · Officer ASP Asia Pineau
Not required
2021-12-02
More
Prior Notification - Larger Home Extension
CERTIFICATE OF LAWFUL DEVELOPMENT (PROPOSED):Alterations to roof to form an end gable, rear dormer. Insertion of three rooflights in front roofslope and the insertion of a rooflight on the side of the projecting pitched roof.
32 Treve Avenue, West Harrow, Harrow, HA1 4AJ · premises record
Applicant Mr A Karaiskos · Officer ROH Roberta Henriques
Approved
2021-07-19
More
Certificate of Lawful Development Existing
Building control
Building-control records are not yet collected for Harrow — the register is being gathered borough by borough (held so far: Lambeth, Brent, Ealing, Westminster, City and others).
Place
What affects it?
No mapped designation intersects a premises point in this postcode in the current build. Open any premises above for its own designation record.
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 23 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 2 applications
Applicant on 1 application
Applicant on 1 application
Applicant on 1 application
Agent on 4 applications
Agent on 3 applications
Agent on 1 application
Applicant on 4 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 1 application
Development
What could it become?
Planning precedent23 applications and 23 mapped decisions in this postcode — precedent for what has been permitted and refused here.
Energy10 EPC records; ratings D: 8, 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 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.