Planning application
P/2024/3682
20 Leigham Drive, Isleworth, TW7 5LU
Proposal
Certificate of lawfulness for hip to gable conversion and erection of rear roof extension with Juliet balcony and two front roof window to the house.
As published by the council, reference P/2024/3682
Timeline
Dates from the published record
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5 Nov 2024
Received by Hounslow
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19 Nov 2024
Decision issued: LAWFNOTGRANT
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3 Aug 2026
Added to PlanIndex
What a grant of permission means
The process from here
Permission has been granted, usually subject to conditions listed on the decision notice, some of which must be discharged before work starts. The decision notice on the council portal sets out exactly what was approved.
Work must normally begin within three years of the decision or the permission lapses. Neighbours cannot appeal a grant; challenging one means judicial review of how the decision was made, within tight time limits.
About lawful development applications
How this application type works
A lawful development certificate is a legal determination, not a planning judgement. It asks the council to confirm either that existing use or works are lawful, often through the passage of time, or that a proposal would not need planning permission at all. The applicant must prove the facts; the merits of the scheme are not considered.
Nearby applications
Within 500 metres
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P/2026/1857 Awaiting decision
28 Leigham Drive, Isleworth, TW7 5LU
Erection of a single storey side and rear extension.
-
P/2025/3080 Awaiting decision
150 Wood Lane, Isleworth, TW7 5EQ
Erection of two storey side, part single, part two storey rear extension, and rear roof extension with two front roof windows to allow for the conversion of the house into five self contained flats with associated car parking and cycle and bin storage.
-
P/2026/1322 Granted
125A Ridgeway Road North, Isleworth, TW7 5LX
Erection of two single‑storey front extensions and a front porch. Alterations to the existing patio, and to the roof line. Elevational alterations to the original dwelling including the external materials, solar panels, and windows/doors openings.
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P/2026/2225 Awaiting decision
125A Ridgeway Road North, Isleworth, TW7 5LX
Works to trees in a conservation area ; T1 Walnut to be fell to ground level and grind stump. T2 Leyland Cypress to be fell to ground level and grind stump.
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P/2026/2203 Awaiting decision
13 Lingwood Gardens, Isleworth, TW7 5LY
Works to trees in a conservation area ;T2 Cherry (Prunus spp) 30% Crown Reduction - reducing the height and spread of the tree by approximately 2-3m to tidy and contain. Final height = m and final spread = 3m.
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P/2026/1711 Granted
22 Lingwood Gardens, Isleworth, TW7 5LZ
Works to two trees within a conservation area. REAR GARDEN. T1 Apple (Malus domestica). Fell to ground level. T2 Pear (Pyrus spp). Reduce height and spread of the tree by up to 0.5 metres. Final height 3.5 metres and spread 2 metres
Other lawful development applications
In Hounslow
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P/2026/2219 Awaiting decision
Great West House,993 Great West Road,Brentford,TW8 9DF
Certificate of lawfulness for the installation of two electricity substations.
-
P/2026/1626 Granted
2 Oak Avenue, Hounslow, TW5 9EB
Certificate of lawfulness for the proposed erection of a rear roof extension with hip to gable conversion and the addition of one front roof light.
-
P/2026/2168 Awaiting decision
49 Durham Road, Feltham, TW14 0AG
Certificate of lawfulness for the proposed erection of a detached outbuilding in the rear garden.
-
P/2026/1448 Granted
13 Orchard Avenue, Hounslow, TW5 0DU
Certificate of lawfulness for the proposed erection of a rear roof extension with a hip to gable conversion to the house.
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P/2026/1682 Granted
133 Swan Road, Feltham, TW13 6LT
Certificate of lawfulness for the proposed erection of a rear roof extension with front roof windows to the house.