83 Carlyon Avenue, South Harrow, Harrow, HA2 8SN Data via plota.co.uk

PL/0907/26 - Certificate of Lawful Development Proposed Approved
Extensions & alterations

Proposal

Certificate of Lawful Development (Proposed): Alterations and extension to roof to form end gable; rear dormer; two rooflights in front roof slope Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
1 Apr 2026
✓
Validated
14 Apr 2026
✓
Approved
9 Jun 2026

Approved on 9 Jun 2026 · Delegated decision · Last checked 1 Oct 2026

Documents 13

Decision & officer reports 2

PDF Decision Notice DN - CLUP Granted · 9 Jun 2026 View ↗ PDF Officer Report Delegated Report · 2 Jun 2026 View ↗

Plans & drawings 9

PDF Proposed Elevations Plans · 14 Apr 2026 View ↗ PDF Existing Elevations Plans · 14 Apr 2026 View ↗ PDF Volume Calculation Plans · 2 Apr 2026 View ↗ PDF proposed sections Plans · 2 Apr 2026 View ↗ PDF Proposed Roof Plan(s) Plans · 2 Apr 2026 View ↗ PDF Proposed Floor plans(s) Plans · 2 Apr 2026 View ↗ PDF Existing floor Plan(s) Plans · 2 Apr 2026 View ↗ PDF Block plan of the site Plans · 2 Apr 2026 View ↗ PDF location plan Plans · 2 Apr 2026 View ↗

Application forms 1

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

Other documents 1

PDF Email Email · 14 Apr 2026 View ↗

All documents on the council site ↗

Site constraints 3

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 2 (poor), TfL 2023, for the 100 m square.
Not affected
Outside flood zones 2 and 3 · Not green belt · No scheduled monument at the site

Checked on 6 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

5 Oct 2026Pending

38 Carlyon Avenue, South Harrow, Harrow, HA2 8SX

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

PL/2489/26
11 Jun 2026Refused

102 Carlyon Avenue, South Harrow, Harrow, HA2 8SY

Certificate of Lawful Proposed Development: Change of use from 6 Bed HMO (Use Cl...

PL/1595/26

Nearby new applications

5 Oct 2026Pending

38 Carlyon Avenue, South Harrow, Harrow, HA2 8SX

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

PL/2489/26
28 Sept 2026Pending

40 Tregenna Avenue, South Harrow, Harrow, HA2 8QT

Single storey rear extension; external alterations

PL/2211/26
30 Sept 2026Pending

63 Stiven Crescent, South Harrow, Harrow, HA2 9AX

Single storey rear extension: 5.00 metres deep, 3.00 metres maximum height and 3...

PL/2581/26
28 Sept 2026Pending

86 The Heights, Northolt, Harrow, UB5 4BS

Single storey rear extension: 4.00 metres deep, 3.00 metres maximum height and 3...

PL/2559/26
25 Sept 2026Pending

64 The Heights, Northolt, Harrow, UB5 4BP

Certificate of Lawful Development (Existing): Alterations and extension to roof ...

PL/2540/26
16 Sept 2026Pending

26 Tregenna Avenue, South Harrow, Harrow, HA2 8QT

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Important details

Council
Harrow
Application type
Certificate of Lawful Development Proposed
Postcode
HA2 8SN
Received
1 Apr 2026
Validated
14 Apr 2026
Ward
Roxeth
Case officer
Show
Target decision
9 Jun 2026
Decision
Grant
Decision date
9 Jun 2026
Decision level
Delegated decision
Applicant
Show
Agent
Show

How this decision compares

Decided in 56 days from validation, about the council's usual 56 days. Approved, as 78% of extensions here are.

84%decided within 8 weeks
78%approved
1,726decided 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
9 Jun 2026

Historical activity at this location

25 nearby applications on record - archival context, not part of the live application.

Within ~100m

Nearby activity

2025
89 Carlyon Avenue, South Harrow, Harrow, HA2 8SN
Single storey rear extension: 4.50 metres deep, 3.00 metres maximum height and 3.00 metre…
PL/2663/25
2025
89 Carlyon Avenue, South Harrow, Harrow, HA2 8SN
Single storey rear extension: 6.00 metres deep, 3.00 metres maximum height and 3.00 metre…
PL/2534/25
2025 Approved
124 Carlyon Avenue, South Harrow, Harrow, HA2 8SW
Single storey rear extension: 6.00 metres deep, 3.00 metres maximum height and 3.00 metre…
PL/0004/25
2024 Approved
114 Carlyon Avenue, South Harrow, Harrow, HA2 8SW
Alterations to roof to form end gable, rear dormer, insertion of two rooflights in front…
PL/2136/24
2024 Approved
131a Carlyon Avenue, South Harrow, Harrow, HA2 8SN
Outbuilding at rear for use as gym / store
PL/0313/24
2024 Approved
131a Carlyon Avenue, South Harrow, Harrow, HA2 8SN
Single storey rear extension; external alterations
PL/0077/24
2023 Approved
131a Carlyon Avenue, South Harrow, Harrow, HA2 8SN
Single storey rear extension to ground floor flat; external alterations
PL/0498/23
2023 Approved
136 Carlyon Avenue, Harrow, HA2 8SW
Single and two storey side to part first floor rear extension to create semI detached (2…
P/1942/22/6186
2023 Approved
91 Carlyon Avenue, South Harrow, Harrow, HA2 8SN
Single storey rear extension: 3.50 metres deep, 3.15 metres maximum height and 3.00 metre…
P/1409/23/PRIOR
2023 Approved
12 Ludlow Close, South Harrow, Harrow, HA2 8SR
Single storey side to rear extension; external alterations (demolition of conservatory)
P/1140/23
2022 Refused
12 Ludlow Close, South Harrow, Harrow, HA2 8SR
Single storey side to rear extension; external alterations (demolition of conservatory)
P/1036/22
2022 Refused
136 Carlyon Avenue, South Harrow, Harrow, HA2 8SW
Single and two storey side to part first floor rear extension to create semi detached (2…
P/1942/22
2022 Approved
99 Carlyon Avenue, South Harrow, Harrow, HA2 8SN
Single storey rear extension; External Alterations
P/2938/22
2022 Approved
115 Carlyon Avenue, South Harrow, Harrow, HA2 8SN
Single Storey Rear Extension: 6.00 metres deep, 3.00 metres maximum height, 3.00 metres h…
P/2239/22/PRIOR
2021 Approved
136 Carlyon Avenue, South Harrow, Harrow, HA2 8SW
Details pursuant to conditions 3 (doors/window/shutters) and 4 (gates) attached to planni…
P/3218/21
2021 Approved
107 Carlyon Avenue, South Harrow, Harrow, HA2 8SN
Single Storey Rear Extension: 6.00 metres deep, 3.00 metres maximum height, 3.00 metres h…
P/2790/21/PRIOR
2021 Refused
101 Carlyon Avenue, South Harrow, Harrow, HA2 8SN
Single storey side to rear extension with sedum roof to create two additional bedrooms to…
P/2055/21
2021 Refused
101 Carlyon Avenue, South Harrow, Harrow, HA2 8SN
Single storey side to rear extension with sedum roof to create two additional bedrooms to…
P/1751/21
2020 Approved
136 Carlyon Avenue, South Harrow, Harrow, HA2 8SW
Change Of Use Of Detached Outbuilding At Rear From Storage Space Ancillary To Dwellinghou…
P/3819/20
2021 Approved
93 Carlyon Avenue, South Harrow, Harrow, HA2 8SN
Single storey side to rear extension (demolition of conservatory) (Amended Site Plan)
P/1947/21
2016 Approved
97 Carlyon Avenue, Harrow, HA2 8SN
Single storey rear extension: extending 6 metres beyond the original rear wall 3.15 Metre…
P/4435/16
2016 Approved
130 Carlyon Avenue, Harrow, HA2 8SW
Single storey rear extension: extending 3.5 Metres beyond the original rear wall 3 metres…
P/2737/16
2016 Approved
10 Ludlow Close, Harrow, HA2 8SR
Single storey front extension incorporating front porch and single and two storey side to…
P/1897/16
2016 Approved
127 Carlyon Avenue, Harrow, HA2 8SN
Single storey rear extension: extending 6 metres beyond the original rear wall 3.7 Metres…
P/0616/16
2016 Approved
127 Carlyon Avenue, Harrow, HA2 8SN
Single storey rear extension: extending 6 metres beyond the original rear wall 3.25 Metre…
P/0614/16
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