Planning application
401 Twickenham Road, Isleworth, TW7 7ES
Works: Extension Loft or dormer Windows or glazing Small domestic
Read from the description, not a valuation. How we read the register
Permission granted. Work must normally begin within three years of the decision or the permission lapses.
Proposal
Certificate of lawfulness for the proposed erection of a rear roof extension with hip to gable conversion and front windows and a front porch extension to the house. Erection of a detached single storey outbuilding to the rear.
As published by the council, reference P/2026/0199
Application record
- Reference
- P/2026/0199
- Type
- Lawful Development Certificate (Proposed)
- Status
- Decided: GRANT
- Decision
- GRANT
- Received
- 21 Jan 2026
- Validated
- 21 Jan 2026
- Decided
- 12 Mar 2026
- Ward
- Isleworth
- Postcode
- TW7 7ES
Site history
Applications at this address on the Hounslow register
This site has had 2 applications since 2026: 2 approved, 0 refused.
-
P/2026/1461 Granted
401 Twickenham Road, Isleworth, TW7 7ES
Installation of solar panels to the roof of the outbuilding and to the rear roof elevation of the main house.
Timeline
Dates from the published record
-
21 Jan 2026
Received by Hounslow
-
12 Mar 2026
Decision issued: GRANT
-
12 Aug 2026
Added to PlanIndex
Documents
Plans, drawings, consultee responses and the officer's report
12 documents on file for this application
A planning file usually holds the application form, drawings and site plans, consultee responses, the officer's report and the decision notice.
Trade members open them from here.
Open the documentsWhat this grant of permission means
Hounslow granted permission on 12 March 2026, subject to any conditions on the decision notice. Work must normally begin within three years or the permission lapses. More in our guide to what happens after a planning decision.
About lawful development applications
A lawful development certificate is a legal determination that existing or proposed works do not need planning permission; the merits of the scheme are not considered. More in our guide to planning application types.
Nearby applications
Within 500 metres
-
401 Twickenham Road, Isleworth, TW7 7ES
Installation of solar panels to the roof of the outbuilding and to the rear roof elevation of the main house.
Granted Householder 12 docsSmall domestic -
403-405 Twickenham Road, Isleworth, TW7 7ES
91% historically approved · decision due ~22 Sep
Variation of conditions 4 (opening times for shop) and 5 (opening times for petrol station) to allow to be rewording of condition 4 to 'the onsite shop shall be permanently open to customers 24 hours' and condition 5 to 'the filling of vehicles with petrol and the associated receipt of payment shall be carried out at the premises 24 hours permanently, with the exception of pumps 1, 2, 3 and 4 which shall not operate between the hours of 11.00pm and 6.00am' of planning permission 01137/403 405/P29 (P/2016/1527) approved 29/06/2016 for the variation of condition 3 to change the opening hours from 07:00 am to 06:00 am following planning permission 01137/403 405/P23 (H/0006/5173) dated 14/12/1983 for erection of petrol service station with car servicing
Awaiting decision Conditions 4 docs -
403-405 Twickenham Road,Isleworth,Hounslow,TW7 7ES
Details of Condition 4 (Waste water) submitted pursuant to planning permission 01137/403-405/P34 (P/2023/1181) dated 05/09/2023 for Demolition of car wash and jet wash machine and the creation of charging zone, erection of EV chargers, erection of canopy, two jet wash bays, sub-station enclosure and associated forecourt works.
Refused Conditions Demolition 4 docs -
395 Twickenham Road, Isleworth, TW7 7ES
65% historically approved · decision due ~7 Jan
Demolition of existing building and erection of two storey residential building comprising of seven self contained flats with associated car parking, landscaping, refuse and recycling.
Awaiting decision Full applications New dwelling Demolition 25 docs -
Telephone Box Outside 260 Twickenham Road, Isleworth
Installation of a double sided internally illuminated digital display on the proposed communications hub
Refused Advertising 13 docs -
Telephone Box Outside 260 Twickenham Road, Isleworth
Installation of a double sided digital communications hub
Refused Full applications 12 docs
Other lawful development applications
In Hounslow
-
P/2026/2033 Granted
3 Benedict Drive, Feltham, TW14 8JH
Certificate of lawfulness for the proposed erection of a rear roof extension with hip to gable conversion with windows to the front and side of the house.
-
P/2026/2027 Granted
115 Northumberland Crescent, Feltham, TW14 9SP
Certificate of lawfulness for the proposed erection of a rear roof extension and windows to the front of the house.
-
P/2026/2009 Granted
3 Brainton Avenue, Feltham, TW14 0AZ
Certificate of lawfulness for the proposed erection of a rear roof extension and Juliette balcony with front roof windows to the house.
-
P/2026/2014 Granted
82 Sussex Avenue, Isleworth, TW7 6LB
Certificate of lawfulness for the proposed erection of a rear roof extension, a porch to the front of the house, and a front roof window.
-
P/2026/2473 Awaiting decision
16 Somerset Waye, Hounslow, TW5 9HG
Certificate of lawfulness for the proposed erection of a rear roof extension with two roof windows to the front and alterations to the existing side roof from flat roof to pitched roof.