131 Thornbury Road, Isleworth, TW7 4ND Data via plota.co.uk

P/2026/1561 - Lawful Development Certificate (Proposed) Approved
Extensions & alterations

Proposal

Certificate of lawfulness for the proposed erection of a detached outbuilding in the rear garden. Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
26 May 2026
✓
Approved
22 Jul 2026

Approved on 22 Jul 2026 · Last checked 19 Sept 2026

Documents 7

Decision & officer reports 1

PDF P-Delegated Report P-Delegated Report · 21 Jul 2026 View ↗

Plans & drawings 2

PDF LocationPlan.pdf P-Location Plan · 24 May 2026 View ↗ PDF SiteBlock Plan - Existing_included_in_Block plan of the site.pdf P-Existing Site · 24 May 2026 View ↗

Application forms 1

PDF ApplicationFormRedacted.pdf P-Planning Application Form · 24 May 2026 View ↗

Other documents 3

PDF SiteLocation.geojson P-Existing Site · 24 May 2026 View ↗ PDF SCP2251114-01.pdf P-Proposed Site · 24 May 2026 View ↗ PDF SCP2251114-1.pdf P-Proposed Site · 24 May 2026 View ↗

All documents on the council site ↗

Site constraints 7

Spring Grove conservation area
Demolition needs planning permission and permitted development is restricted.
The council must give weight to preserving or enhancing the area's character and appearance. Not every council has published its boundaries as open data.
Council document ↗
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 Named permitted development rights are withdrawn here.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
1 listed building within 150 m; Inside the Hounslow built-up area; Public transport access: PTAL 3 (moderate), TfL 2023, for the 100 m square; National infrastructure project 1706 m away: Teddington Direct River Abstraction (TDRA), at pre-application.
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, the Planning Inspectorate, 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.

Sales history 2

Last sold for £804,545 in February 2019. Semi-detached house, freehold.

22 February 2019£804,545
4 April 2014£700,000

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

Building

Floor area138 m² (1,485 sq ft)
Energy ratingD (61 out of 100)
PropertySemi-detached house, 6 habitable rooms
Built1900 to 1929
HeatingBoiler and radiators, mains gas
WallsSolid brick, as built, no insulation (assumed)

From the energy performance certificate lodged in November 2010, the latest held for this property. The building may have changed since. View the certificate

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Other new applications on this street

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Important details

Council
Hounslow
Application type
Lawful Development Certificate (Proposed)
Postcode
TW7 4ND
Received
26 May 2026
Validated
26 May 2026
Ward
Osterley & Spring Grove
Case officer
Show
Decision
Grant
Decision date
22 Jul 2026
Applicant
Show

How this decision compares

Decided in 57 days from validation, about the council's usual 54 days. Approved, as 81% of extensions here are.

78%decided within 8 weeks
81%approved
924decided in the last year

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

Public comments

No public comments yet.

Read the comments on the council site ↗

Consultation & key dates

Consultation
27 May 2026
Comments by
27 May 2026
Statutory expiry
21 Jul 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
107 Thornbury Road, Isleworth, TW7 4ND
Works to a tree within TPO 279. T1 Silver Birch (Betula pendula). Reduce crown to the mos…
P/2025/3640
2025 Approved
113 Thornbury Road, Isleworth, TW7 4ND
Works to tree within a conservation area. Rear Garden. Bay (Laurus nobilis). Reduce heigh…
P/2025/3448
2025 Approved
109 Thornbury Road, Isleworth, TW7 4ND
Works to an Olive tree in a front garden within a conservation area. Reduce height and sp…
P/2025/3446
2025 Approved
111 Thornbury Road, Isleworth, TW7 4ND
Works to tree within a conservation area. Boxelder Maple (Acer negundo) T1. Remove low li…
P/2025/3447
2025 Approved
1 Caroline Close, Isleworth, TW7 4QA
Works to tree within TPO 141: T1 - Horse Chestnut tree - Reduce crown back to previous re…
P/2025/0837
2025 Approved
1 Caroline Close, Isleworth, TW7 4QA
Work to trees within a conservation area: G1 x8 (Leylandii) - Reduce height by approx. 1…
P/2025/0819
2024 Approved
1 Caroline Close, Isleworth, TW7 4QA
Felling of six Leylandii trees within conservation area and replace with new species.
P/2024/4332
2024 Approved
116 THORNBURY ROAD, ISLEWORTH, TW7 4NH
Works to trees in a conservation area: T1 - Hawthorne reduce by 2 metres to 4.5 metres hi…
P/2024/0718
2023 Approved
113 THORNBURY ROAD, ISLEWORTH, TW7 4ND
Works to trees within a Conservation Area. (T1) Rowan - Reduce back by 0.5 meters to last…
P/2023/3168
2023 Approved
CAMPION HOUSE BLUMENTHAL CLOSE, ISLEWORTH, TW7 4FG
Works to a tree in a conservation area: T1 - Cedar: Crown lift to 5m by removal of second…
P/2023/3086
2023 Approved
2 CAROLINE CLOSE, ISLEWORTH, TW7 4QA
Work to trees within conservation area: Maple tree - reduce by 2 metres in height and 1 m…
P/2023/1417
2023 Approved
103 THORNBURY ROAD, ISLEWORTH, TW7 4ND
Erection of a rear and side roof extension
P/2023/0813
2022 Approved
51 MARBAIX GARDENS, ISLEWORTH, TW7 4FD
Erection of a single storey rear extension to the house
P/2022/2996
2022 Approved
107 THORNBURY ROAD, ISLEWORTH, TW7 4ND
T1 Silver Birch (Betula pendula) Reduce crown to the most recent previous reduction point…
P/2022/3241
2022 Approved
5 CHURCH ROAD, ISLEWORTH, TW7 4PL
Felling of three Leylandii Hedges (T1 - T3) within a conservation area.
P/2022/1119
2022 Approved
2 CHURCH ROAD, ISLEWORTH, TW7 4PL
Erection of a single storey rear extension to the house
P/2022/0564
2022 Approved
4 THORNBURY AVENUE, ISLEWORTH, TW7 4NQ
Erection of a side dormer and rear roof extension with two front roof windows to the house
P/2022/0151
2021 Approved
3 CHURCH ROAD, ISLEWORTH, TW7 4PL
Erection of a rear and side roof extension with one front and two side roof windows
P/2021/4504
2021 Approved
121 THORNBURY ROAD, ISLEWORTH, TW7 4ND
Works to a tree within TPO 141 - Cherry (T1) to fell to ground level and re-plant in the…
P/2021/4044
2021 Approved
111 THORNBURY ROAD, ISLEWORTH, TW7 4ND
Works to a trees within a conservation area: T1- Ash Leaf Maple in front garden reduce to…
P/2021/4176
2017 Refused
121 THORNBURY ROAD ISLEWORTH TW7 4ND
Works to a tree with a tree preservation order located within a Conservation Area. T1 - C…
P/2017/1176
2017 Approved
4 CHURCH ROAD ISLEWORTH TW7 4PL
Works to various trees within a conservation area Cherry : Fell to ground level Bay: Redu…
P/2017/0839
2016 Approved
659 GREAT WEST ROAD ISLEWORTH TW7 4PT
Erection of a single storey rear extension to the house
P/2016/5191
2016 Refused
105 THORNBURY ROAD ISLEWORTH LONDON TW7 4ND
Works to a tree within TPO 141 - Purple Leaf Plum Tree to be felled (5 day notice)
P/2016/0674
2016 Approved
659 GREAT WEST ROAD HOUNSLOW LONDON TW7 4PT
Erection of a rear roof extension with hip to gable conversion with two roof windows to f…
P/2016/1388
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

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

Energy performance: Energy performance certificates from the Energy Performance of Buildings Register, Ministry of Housing, Communities and Local Government. Contains public sector information licensed under the Open Government Licence v3.0. © Crown copyright 2026.