20 Cannon Lane, Pinner, Harrow, HA5 1HL Data via plota.co.uk

PL/2462/26 - Householder Pending Consideration
Extensions & alterations

Proposal

Front porch; single storey side plant room extension; external alterations (Retrospective) Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
16 Sept 2026
✓
Validated
17 Sept 2026
Decision
Expected by 12 Nov 2026

This application is under consideration - no decision has been issued yet. Plota predicts a decision around 12 Nov 2026, from Harrow's recent extensions.

Documents 3

Statements & assessments 1

PDF Reasonable Exception Statement Report · 17 Sept 2026 View ↗

Plans & drawings 1

PDF Apprpved & Built Floor plan, Elevation & Site Location Plans Plans · 17 Sept 2026 View ↗

Application forms 1

PDF Application Form Redacted Application Form (Redacted) · 17 Sept 2026 View ↗

All documents on the council site ↗

Site constraints 6

Flood zone 3, rivers and sea
High chance: a 1 in 100 or greater annual chance from rivers, or 1 in 200 from the sea. Any development here needs a flood risk assessment. Defences are not counted.
The Environment Agency flood map for planning. Homes in zone 3 must also pass the sequential test. Surface water flooding is a separate map.
Flood map ↗
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
1 listed building within 150 m; Inside the Harrow built-up area; Priority habitat 32 m away: Deciduous woodland; Designated open space 32 m away.
Not affected
Not green belt · No scheduled monument at the site

Checked on 29 September 2026. Historic England, the Environment Agency, Natural England 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.

Sales history 4

Last sold for £835,000 in July 2015. Detached house, freehold.

29 April 2026£5,000Other property. A nominal price
3 July 2015£835,000
19 July 2004£495,000
21 June 1999£260,000

Sale prices from HM Land Registry's price paid record, matched to this application by its address.

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Other new applications on this street

3 Sept 2026Pending

24 Cannon Lane, Pinner, Harrow, HA5 1HL

Details pursuant to conditions 5 (Precautionary Working Method Statement) and 6 ...

PL/2334/26
28 Sept 2026Pending

136 Cannon Lane, Pinner, Harrow, HA5 1HR

Single storey front extension incorporating porch; single storey side extension;...

PL/2552/26
26 Jun 2026Approved

219 Cannon Lane, Pinner, Harrow, HA5 1JA

Single storey rear extension: 6.00 metres deep, 3.20 metres maximum height and 3...

PL/1745/26
9 Jun 2026Approved

130 Cannon Lane, Pinner, Harrow, HA5 1HR

Single storey front and side extension incorporating porch; external alterations...

PL/1553/26

Nearby new applications

28 Sept 2026Pending

ELMDENE The Chase, Harrow, Pinner, HA5 5QP

Single storey rear extension (Demolition of rear conservatory)

PL/2584/26
28 Sept 2026Pending

136 Cannon Lane, Pinner, Harrow, HA5 1HR

Single storey front extension incorporating porch; single storey side extension;...

PL/2552/26
24 Jul 2026Approved

58 Marsh Road, Pinner, Harrow, HA5 5NQ

Tookes Green Conservation Area Lawson cypress: Reduce in height by up to 40% Swe...

PL/2013/26
21 Apr 2026Pending

78 Marsh Road, Pinner, Harrow

Demolition of the existing boundary treatment at the front, along with the flowe...

PL/1080/26
4 Sept 2026Pending

76 Marsh Road, Pinner, Harrow, HA5 5NQ

Certificate of lawful development (proposed): Installation of two external air-s...

PL/2341/26
3 Sept 2026Pending

24 Cannon Lane, Pinner, Harrow, HA5 1HL

Details pursuant to conditions 5 (Precautionary Working Method Statement) and 6 ...

PL/2334/26

Important details

Council
Harrow
Application type
Householder
Postcode
HA5 1HL
Received
16 Sept 2026
Validated
17 Sept 2026
Ward
Pinner South
Case officer
Show
Target decision
12 Nov 2026
Decision level
Delegated decision
Applicant
Show
Agent
KDB Building Designs Ltd

Decision outlook

Day 18 of the 56-day target. Harrow usually decides extensions by day 56.

Day 1838 days to the 56-day target
84%decided within 8 weeks
78%approved
1,672decided 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
12 Nov 2026

Historical activity at this location

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

This property

Previous applications at this address

2024 Approved
Certificate of Lawful Development (Proposed): Side Dormer and Loft Conversion
PL/2380/24
2024 Approved
Single storey side extension, Single and two storey rear extension (Demolition of detache…
PL/2391/24
2020 Approved
T2 Silver Birch (rear garden): In decline. Fell and replace *see below
P/2570/20
Within ~100m

Nearby activity

2025 Withdrawn
24 Cannon Lane, Pinner, Harrow, HA5 1HL
Single storey front extension, Relocation of entrance door to front elevation, Two storey…
PL/0935/25
2025 Approved
14 Cannon Lane, Pinner, Harrow, HA5 1HL
Single storey rear extension
PL/0807/25
2024 Approved
13 Vale Croft, Pinner, Harrow, HA5 1HJ
Single storey rear extension: 6.00 metres deep, 3.20 metres maximum height and 3.00 metre…
PL/3216/24
2024 Approved
49 Cannon Lane, Pinner, Harrow, HA5 1HN
Single storey rear extension: 5.00 metres deep, 3.50 metres maximum height and 3.00 metre…
PL/1301/24
2024 Approved
53 Cannon Lane, Pinner, Harrow, HA5 1HN
Single storey rear extension: 3.29 metres deep, 4.00 metres maximum height and 3.00 metre…
PL/1083/24
2024 Approved
9 Cannon Lane, Pinner, Harrow, HA5 1HH
Single storey rear extension: 4.00 metres deep, 3.25 metres maximum height and 3.00 metre…
PL/0635/24
2023 Approved
8 Cannon Lane, Pinner, Harrow, HA5 1HL
T7 Oak (front, near left boundary): Crown lift all round to give approx. 5m ground cleara…
PL/0287/23
2023 Refused
14 Cannon Lane, Pinner, Harrow, HA5 1HL
Single storey rear extension: 8.00 metres deep, 3.00 metres maximum height and 2.80 metre…
P/2552/23/PRIOR
2023 Refused
14 Cannon Lane, Pinner, Harrow, HA5 1HL
Single storey rear extension: 8.00 metres deep, 3.00 metres maximum height and 2.80 metre…
P/1703/23/PRIOR
2023 Approved
55 Cannon Lane, Pinner, Harrow, HA5 1HN
Front porch; single storey front, side and rear extension; external alterations (demoliti…
P/0087/23
2022 Approved
55 Cannon Lane, Pinner, Harrow, HA5 1HN
Single storey rear extension: 5.30 metres deep, 3.70 metres maximum height and 3.00 metre…
P/3259/22/PRIOR
2020 Approved
4 Vale Croft, Pinner, Harrow, HA5 1HJ
Single storey side to rear extension
P/4561/20
2020 Approved
34 Cannon Lane, Pinner, Harrow, HA5 1HL
Single storey front extension incorporating front porch; two storey side extension; singl…
P/3084/20
2020 Approved
57 Cannon Lane, Pinner, Harrow, HA5 1HN
Single storey rear conservatory extension
P/3399/20
2020 Refused
4 Vale Croft, Pinner, Harrow, HA5 1HJ
Single Storey Rear Extension: extending 5.99 metres beyond the original rear wall, 3.95 m…
P/3674/20/PRIOR
2020 Approved
8 Cannon Lane, Pinner, Harrow, HA5 1HL
T7 Oak (front boundary): Crown Reduce back to previous points by removing 2m from all ove…
P/1569/20
2017 Approved
1 Vale Croft, Pinner, HA5 1HJ
Single storey rear extension: extending 3.50 Metres beyond the original rear wall 3.55 Me…
P/0653/17
2019 Approved
37 Cannon Lane, Pinner, Harrow, HA5 1HN
Single Storey Rear Extension: extending 3.85 metres beyond the original rear wall, 3 metr…
P/2520/19/PRIOR
2018 Approved
12 Cannon Lane, Pinner, HA5 1HL
Single storey detached dwelling at rear; refuse and cycle storage
P/4760/18
2018 Approved
57 Cannon Lane, Pinner, Harrow, HA5 1HN
Single storey side extension (demolition of attached garage)
P/4937/18
2016 Approved
8 Cannon Lane, Pinner, HA5 1HL
T7 oak (front garden): clear branches away from phone line (1m clearance) and remove plas…
P/1757/16
2016 Approved
5 Vale Croft, Pinner, HA5 1HJ
Single storey rear extension: extending 3.1 Metres beyond the original rear wall 3.975 Me…
P/1186/16
2016 Approved
41 Cannon Lane, Pinner, HA5 1HN
Single storey rear extension: extending 4 metres beyond the original rear wall 4 metres m…
P/0821/16
2016 Approved
8 Cannon Lane, Pinner, HA5 1HL
Single storey front extension; conversion of garage to habitable room
P/0445/16
2016 Approved
2 Vale Croft, Pinner, HA5 1HJ
Single storey rear extension: extending 6 metres beyond the original rear wall 3.1 Metres…
P/0203/16
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

Sale prices: Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0.

Freehold boundary: © Crown copyright and database rights 2026, HM Land Registry. Polygons © Crown copyright and database rights 2026 Ordnance Survey 100026316. Conditions of use