86 Kneller Gardens,Isleworth,TW7 7NW Data via plota.co.uk

P/2026/2425 - Lawful Development Certificate (Proposed) REGISTERED: Under Assessment
Extensions & alterations

Proposal

Certificate of lawfulness for the proposed erection of a rear roof extension with hip to gable conversion and a single storey rear extension. Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
25 Aug 2026
Decision
Expected by 20 Oct 2026

This application is under consideration - no decision has been issued yet. Plota predicts a decision around 14 Oct 2026, from Hounslow's recent extensions.

Documents 10

Plans & drawings 4

PDF LocationPlan.pdf P-Location Plan · 25 Aug 2026 View ↗ PDF 01.pdf P-Location Plan · 25 Aug 2026 View ↗ PDF 04.pdf P-Existing Elevation · 25 Aug 2026 View ↗ PDF 07.pdf P-Proposed Elevation · 25 Aug 2026 View ↗

Application forms 1

PDF ApplicationFormRedacted.pdf P-Planning Application Form · 25 Aug 2026 View ↗

Other documents 5

PDF SiteLocation.geojson P-Existing Site · 25 Aug 2026 View ↗ PDF 05.pdf P-Proposed Plans · 25 Aug 2026 View ↗ PDF 03.pdf P-Existing Plans · 25 Aug 2026 View ↗ PDF 02.pdf P-Existing Plans · 25 Aug 2026 View ↗ PDF 06.pdf P-Proposed Plans · 25 Aug 2026 View ↗

All documents on the council site ↗

Site constraints 3

Article 4 direction
Dwellinghouses (C3) to small HMOs (C4) - borough-wide Article 4 Direction. Named permitted development rights are withdrawn here.
An Article 4 direction withdraws particular permitted development rights, so work that would normally need no application needs one here. Not every council has published its directions.
Air quality management area: Hounslow 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 Hounslow built-up area.
Not affected
Outside flood zones 2 and 3 · Not green belt · No listed building at the site

Checked on 11 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.

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Other new applications on this street

4 Aug 2026Decided

72 Kneller Gardens, Isleworth, TW7 7NW

Ground floor rear extension 6.00 metres deep, maximum height of 2.90 metres, 2.9...

PA/2026/2246
9 Jul 2026Pending

1 Kneller Gardens,Isleworth,TW7 7NP

Erection of a single storey rear extension and first floor side extension.

P/2026/2025

Nearby new applications

9 Sept 2026Pending

13 Heather Close, Isleworth, TW7 7PR

Erection of a rear roof extension.

P/2026/2561
1 Sept 2026Pending

Kneller Hall Royal Military School Of Music, Kneller Road, Twickenham, TW2 7DU

Details pursuant to Condition 16 - 3G sports pitch surfacing (shockpad) of plann...

PA26/3043
3 Sept 2026Pending

25 Arnold Crescent,Isleworth,TW7 7NS

Erection of a single storey rear, two storey side extension, and rear roof exten...

P/2026/2503
28 Aug 2026Pending

12 Consort Mews,Isleworth,TW7 7NA

Erection of a two storey side extension, part single storey part two storey rear...

P/2026/2401
17 Aug 2026Pending

Kneller Hall Royal Military School Of Music, Kneller Road, Twickenham, TW2 7DU

Details pursuant to Condition 2 Heritage Method Statement of planning reference ...

PA26/2856
13 Aug 2026Pending

RADNOR HOUSE SCHOOL LIMITED, Kneller Road, Twickenham, TW2 7DU

Details pursuant to Condition 42- Urban Greening, Green Roofs & Green Walls (Pha...

PA26/2830

Important details

Council
Hounslow
Application type
Lawful Development Certificate (Proposed)
Postcode
TW7 7NW
Received
25 Aug 2026
Validated
25 Aug 2026
Ward
Hounslow South
Case officer
Show
Applicant
Show

Decision outlook

Day 20 of the 56-day target. Hounslow usually decides extensions by day 50.

Day 2036 days to the 56-day target
82%decided within 8 weeks
83%approved
767decided in the last year

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

Consultation & key dates

Consultation
25 Aug 2026
Statutory expiry
20 Oct 2026

Historical activity at this location

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

Within ~100m

Nearby activity

2025 Approved
22 Kneller Gardens, Isleworth, TW7 7NW
Erection of a front porch extension to the house.
P/2025/2627
2025 Approved
50 Kneller Gardens, Isleworth, TW7 7NW
Erection of a dual pitched roof with roof windows to the detached single storey outbuildi…
P/2025/0083
2023 Approved
381 WHITTON DENE, ISLEWORTH, TW7 7NF
Ground floor rear extension 4.50 metres deep, maximum height of 3.40 metres, 3.00 metres…
PA/2023/2857
2023 Approved
76 KNELLER GARDENS, ISLEWORTH, TW7 7NW
Ground floor rear extension 6.00 metres deep, maximum height of 3.60 metres, 2.70 metres…
PA/2023/2207
2023 Refused
347 WHITTON DENE, ISLEWORTH, TW7 7NE
Erection of a rear roof extension with hip to gable and front & rear roof windows.
P/2023/1145
2023 Withdrawn
349 WHITTON DENE, ISLEWORTH, TW7 7NE
Erection of a rear roof extension to the house.
P/2023/1070
2023 Refused
347 WHITTON DENE, ISLEWORTH, TW7 7NE
Erection of a rear roof extension with hip to gable conversion and two front roof windows…
P/2023/0036
2022 Refused
349 WHITTON DENE, ISLEWORTH, TW7 7NE
Erection of a rear roof extension with hip to gable conversion and three front roof windo…
P/2022/3755
2021 Refused
70 KNELLER GARDENS, ISLEWORTH, HOUNSLOW, TW7 7NW
Works to Crab Apple Tree comprising of cutting overhanging branches back to boundary with…
P/2021/2382
2020 Refused
52 KNELLER GARDENS, ISLEWORTH, TW7 7NW
Erection of front porch to front of house.
P/2020/3703
2020 Refused
52 KNELLER GARDENS, ISLEWORTH, TW7 7NW
Erection of a front porch extension to the house
P/2020/2157
2020 Approved
54 KNELLER GARDENS, ISLEWORTH, TW7 7NW
Ground floor rear extension 4.74 metres deep, maximum height 3.32, 2.80 high to the eaves
PA/2020/2150
2020 Approved
375 WHITTON DENE, ISLEWORTH, TW7 7NF
Erection of a single storey rear extension to the house
P/2020/1909
2020 Refused
335 WHITTON DENE, ISLEWORTH, TW7 7NE
Installation of a vehicular access, hard standing and erection of a new boundary wall to…
P/2020/0373
2020 Approved
15 KNELLER GARDENS, ISLEWORTH, TW7 7NP
Ground floor rear extension 4.50 metres deep, maximum height 3.00 metres, 2.90 metres hig…
PA/2020/0169
2019 Approved
38 KNELLER GARDENS, ISLEWORTH, TW7 7NW
Erection of a single storey rear extension
P/2019/0829
2018 Approved
377 WHITTON DENE, ISLEWORTH, TW7 7NF
Erection of a single storey rear extension to the house.
P/2018/2620
2018 Approved
44 KNELLER GARDENS ISLEWORTH TW7 7NW
Ground floor rear extension 6 metres deep, maximum height of 4 metres, 2.85 metres high t…
PA/2018/1276
2018 Approved
18 KNELLER GARDENS ISLEWORTH LONDON TW7 7NW
Ground floor rear extension 6m deep, 2.95m high to the eaves with the maximum height of 2…
PA/2018/0310
2017 Approved
68 KNELLER GARDENS ISLEWORTH LONDON TW7 7NW
Ground floor rear extension 4m deep, 3m high to the eaves with the maximum height of 3.35m
PA/2017/5113
2016 Approved
214 HALL ROAD ISLEWORTH TW7 7PG
Erection of a single storey side extension to convert an existing garage into habitable r…
P/2016/1690
2016 Approved
70 KNELLER GARDENS ISLEWORTH TW7 7NW
Erection of a single storey rear extension to the house
P/2016/2918
2016 Approved
11 KNELLER GARDENS ISLEWORTH TW7 7NP
Ground floor rear extension 4 metres deep, maximum height of 3.6 metres, 2.95 metres high…
PA/2016/2328
2016 Approved
62 KNELLER GARDENS ISLEWORTH LONDON TW7 7NW
Erection of a single storey rear extension
P/2016/1893
2016 Refused
214 HALL ROAD ISLEWORTH LONDON TW7 7PG
Erection of part single / part two side extension.
P/2016/1692
Hounslow
Planning Authority Score
2.1/10
Poor
#268 of 296 councils
Relevant to this application:
Householder decisions

Hounslow is slower than most councils at deciding householder applications, ranking #203 out of 296. 47% of applications have the time limit extended, above the 41% national average. Hounslow is also one of the strictest councils - it refuses more householder applications than almost any other, with only 75% approved vs 90% nationally.

One of the strictest councils
only 75% approved vs 90% nationally
These figures are council-wide context, not a prediction for this application. View full council performance
Hounslow decision statistics
Based on MHCLG data, the year to March 2026
71%
Overall approval rate
Below avg (87%) #294 of 296
75%
Householder approved
Below avg (90%) #293 of 296
56%
Decided in 8 weeks
Below avg (63%) #203 of 296
47%
Extended time limit
Above avg (41%) #208 of 296
38%
Minor dwellings approved
82 decided (1-9 homes)
93%
Major dwellings approved
14 decided (10+ homes)
29%
Change of use approved
72 decided
1,191
Total decisions
340 refused in the year to March 2026
Source: MHCLG planning statistics · See full council rankings