8A Derwent Avenue, Hatch End, Pinner, Harrow, HA5 4QJ Data via plota.co.uk

PL/2315/26 - Prior Notification - Larger Home Extension Refused
Extensions & alterations

Proposal

Single storey rear extension: 4.50 metres deep, 3.00 metres maximum height and 2.80 metres high to the eaves Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
1 Sept 2026
✗
Refused
12 Oct 2026
Appeal
Not lodged

Refused on 12 Oct 2026 · Delegated decision · Last checked 19 Oct 2026

Documents 5

Decision & officer reports 2

PDF Decision Notice Decision Notice · 12 Oct 2026 View ↗ PDF Officer Report Delegated Report · 6 Oct 2026 View ↗

Plans & drawings 2

PDF Location Plan Plans · 2 Sept 2026 View ↗ PDF Block Plan Plans · 2 Sept 2026 View ↗

Application forms 1

PDF Application Form Application Form (Redacted) · 2 Sept 2026 View ↗

All documents on the council site ↗

Site constraints 4

Air quality management area: Harrow AQMA
The council has declared the area as failing an air quality objective.
Schemes that add traffic, parking or combustion plant are assessed against the area's action plan and may need an air quality assessment.
Council record ↗
Also on the record
Inside the Harrow built-up area; Public transport access: PTAL 0 (very poor), TfL 2023, for the 100 m square; Green belt 22 m away: London.
Not affected
Outside flood zones 2 and 3 · No listed building at the site · No scheduled monument at the site

Checked on 17 October 2026. Historic England, the Environment Agency, Natural England, Transport for London (public transport access levels, Powered by TfL Open Data, OGL v3.0, contains OS data © Crown copyright and database right 2025) and council datasets, Open Government Licence. A boundary can run through a site and the council holds the definitive record: confirm with the council before relying on this.

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Other new applications on this street

17 Sept 2026Pending

8 Derwent Avenue, Hatch End, Pinner, Harrow, HA5 4QJ

Front porch and relocation of entrance to front; single storey side to rear exte...

PL/2178/26
3 Sept 2026Pending

27 Derwent Avenue, Hatch End, Pinner, Harrow, HA5 4QH

Front porch, Bay window to ground floor front elevation, Relocation of entrance ...

PL/2318/26
18 Jun 2026Approved

15 Derwent Avenue, Hatch End, Pinner, Harrow, HA5 4QH

Single storey side to rear extension; front porch; single storey outbuilding in ...

PL/1683/26

Nearby new applications

22 Oct 2026Pending

1 Hillview Close, Hatch End, Pinner, Harrow, HA5 4PD

Variation of condition 2 (Approved Plans) attached to planning permission PL/052...

PL/2793/26
2 Oct 2026Pending

8 Hillview Close, Hatch End, Pinner, Harrow, HA5 4PD

Certificate of lawful development (proposed): Dormer and rooflight to each side ...

PL/2615/26
17 Sept 2026Pending

8 Derwent Avenue, Hatch End, Pinner, Harrow, HA5 4QJ

Front porch and relocation of entrance to front; single storey side to rear exte...

PL/2178/26
15 Sept 2026Pending

37 The Avenue, Hatch End, Pinner, Harrow, HA5 4EL

Two storey front extension with roof canopy; single and two storey rear extensio...

PL/2453/26
3 Sept 2026Pending

17 Grimsdyke Road, Hatch End, Pinner, Harrow, HA5 4PJ

Variation of Condition 2 (Approved Plans) attached to planning permission PL/161...

PL/2333/26
3 Sept 2026Pending

27 Derwent Avenue, Hatch End, Pinner, Harrow, HA5 4QH

Front porch, Bay window to ground floor front elevation, Relocation of entrance ...

PL/2318/26

Important details

Council
Harrow
Application type
Prior Notification - Larger Home Extension
Postcode
HA5 4QJ
Received
1 Sept 2026
Validated
1 Sept 2026
Ward
Hatch End
Case officer
Show
Target decision
13 Oct 2026
Decision
Refused
Decision date
12 Oct 2026
Decision level
Delegated decision
Applicant
Show
Agent
H S PLANNING LTD

How this decision compares

Decided in 41 days from validation, 15 days faster than Harrow's median of 56 for extensions. Refused, as 21% of extensions here are.

80%decided within 8 weeks
79%approved
1,936decided in the last year

Plota live figures for extensions decided by Harrow in the last twelve months, from validation. Harrow decision record →

Consultation & key dates

Statutory expiry
13 Oct 2026

Historical activity at this location

26 previous applications on record - archival context, not part of the live application.

This property

Previous applications at this address

2017 Withdrawn
INVALID - Removal/Variation of Condition number 8. Conversion of garage to habitable room.
P/2880/17
Within ~100m

Nearby activity

2025
30 Derwent Avenue, Hatch End, Pinner, Harrow, HA5 4QJ
Single storey rear extension; alterations to roof to form gable ends; two dormers to each…
PL/3120/25
2025 Approved
15 Derwent Avenue, Hatch End, Pinner, Harrow, HA5 4QH
Single storey side to rear extension; alterations and extension to roof to form end gable…
PL/0649/25
2025 Approved
27 Derwent Avenue, Hatch End, Pinner, Harrow, HA5 4QH
Front porch, Relocation of entrance door to front elevation Single and two storey side ex…
PL/0384/25
2024 Approved
42 Derwent Avenue, Hatch End, Pinner, Harrow, HA5 4QJ
Single storey side to rear extension; first floor side extension; relocation of main entr…
PL/1691/24
2024 Approved
42 Derwent Avenue, Hatch End, Pinner, Harrow, HA5 4QJ
Single storey side to rear extension; first floor side extension; alterations and extensi…
PL/0726/24
2023 Approved
42 Derwent Avenue, Hatch End, Pinner, Harrow, HA5 4QJ
Single storey side to rear extension; single storey rear extension; first floor side exte…
PL/0419/23
2023 Approved
42 Derwent Avenue, Hatch End, Pinner, Harrow, HA5 4QJ
Single storey rear extension: 6.00 metres deep, 3.20 metres maximum height and 2.54 metre…
PL/0192/23
2023 Approved
42 Lyndon Avenue, Hatch End, Pinner, Harrow, HA5 4QG
Conversion of garage to habitable room with installation of window to front; external alt…
P/1731/23
2022 Approved
27 Derwent Avenue, Pinner, HA5 4QH
Alterations and extension to roof to create first floor level; front and rear dormers; ro…
P/0126/22/6079
2022 Approved
33 Derwent Avenue, Hatch End, Pinner, Harrow, HA5 4QH
Single storey side extension to create undercroft; single storey side to rear extension…
P/2754/22
2022 Refused
33 Derwent Avenue, Hatch End, Pinner, Harrow, HA5 4QH
Single storey side extension; single storey rear extension; front porch; alterations and…
P/1059/22
2022
27 Derwent Avenue, Hatch End, Pinner, Harrow, HA5 4QH
Alterations and extension to roof to create first floor level; front and rear dormers; ro…
P/0126/22
2020 Approved
22 Derwent Avenue, Hatch End, Pinner, Harrow, HA5 4QJ
Single storey rear extension
P/4167/20
2020 Approved
16 Lyndon Avenue, Hatch End, Pinner, Harrow, HA5 4QG
Single storey front extension incoporating front porch; single and two storey side to rea…
P/4492/20
2020 Withdrawn
35 Derwent Avenue, Hatch End, Pinner, Harrow, HA5 4QH
Single storey side extension
P/3848/20
2020 Withdrawn
22 Derwent Avenue, Hatch End, Pinner, Harrow, HA5 4QJ
P/4156/20
2020 Approved
28 Lyndon Avenue, Pinner, HA5 4QG
Internal structural alterations rear dormer loft conversion with roof lights to front sid…
IN/00815/2020
2020 Approved
20 Lyndon Avenue, Hatch End, Pinner, Harrow, HA5 4QG
First floor side extension; Single and two storey rear extension; Single storey rear exte…
P/1933/20
2020 Approved
22 Derwent Avenue, Hatch End, Pinner, Harrow, HA5 4QJ
Single storey side extension
P/1093/20
2020 Approved
18 Derwent Avenue, Hatch End, Pinner, Harrow, HA5 4QJ
Single Storey Rear Extension: 5.16 metres deep, 2.63 metres maximum height, 2.43 metres h…
P/1062/20/PRIOR
2017 Withdrawn
1 Derwent Avenue, Hatch End, Pinner, Harrow, HA5 4QH
Single Storey Rear Extension: extending 4.235 metres beyond the original rear wall, 4 met…
P/3758/17
2017 Withdrawn
27 Derwent Avenue, Hatch End, Pinner, Harrow, HA5 4QH
INVALID - To carry out 4M rear extension and 1.8M side extension
P/3124/17
2016 Approved
3 Derwent Avenue, Pinner, HA5 4QH
Single storey rear extension
P/5575/16
2016 Approved
38 Lyndon Avenue, Pinner, HA5 4QG
Single storey rear infill extension.
P/4136/16
2016 Approved
12 Lyndon Avenue, Pinner, HA5 4QG
First floor side extension; rooflight in front and rear roofslopes; sun pipe in side roof…
P/0930/16
Harrow
Planning Authority Score
4.9/10
Below average
#153 of 296 councils
Relevant to this application:
Householder decisions

Harrow ranks #115 out of 296 councils for householder decision speed. Harrow is also one of the strictest councils - it refuses more householder applications than almost any other, with only 83% approved vs 90% nationally.

One of the strictest councils
only 83% approved vs 90% nationally
These figures are council-wide context, not a prediction for this application. View full council performance
Harrow decision statistics
Based on MHCLG data, the year to March 2026
78%
Overall approval rate
Below avg (87%) #273 of 296
83%
Householder approved
Below avg (90%) #261 of 296
71%
Decided in 8 weeks
Above avg (63%) #115 of 296
33%
Extended time limit
Below avg (41%) #77 of 296
44%
Minor dwellings approved
133 decided (1-9 homes)
80%
Major dwellings approved
5 decided (10+ homes)
38%
Change of use approved
26 decided
1,330
Total decisions
298 refused in the year to March 2026
Source: MHCLG planning statistics · See full council rankings