Planning application
26/00352/PLD
3 Walnut Farm Science Park Lockgate Road Sidlesham West Sussex PO20 7QQ
Proposal
Proposed single storey extension to commercial building.
As published by the council, reference 26/00352/PLD
Timeline
Dates from the published record
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13 Feb 2026
Received by South Downs National Park
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1 Apr 2026
Decision issued: PERMIT
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27 Jul 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
-
26/01035/FUL Awaiting decision
Walnut Farm Science Park Lockgate Road Sidlesham West Sussex
Demolition of existing lean-to building and construction of replacement building within Class E(g) use (office, research, and development and light industry)
-
12/00100/COU Granted
Units 1 And 2 Walnut Farm Science Park Lockgate Road Sidlesham West Sussex PO20 7QQ
Storage and preparation of cars.
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12/00100/COU Granted
Units 1 And 2 Walnut Farm Science Park Lockgate Road Sidlesham West Sussex PO20 7QQ
Storage and preparation of cars.
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26/00111/PA3Q Awaiting decision
Willowdene Nursery Fletchers Lane Sidlesham Chichester West Sussex PO20 7QG
Prior Approval of Proposed Change of Use of an existing agricultural building to 1 no' dwellinghouse (Use Class C3), and for associated operational development, under Part 3, Class Q(c) of The Town and Country Planning (General Permitted Development) (England) Order 2015 (as amended) which was amended by Statutory Instrument 2024 No. 579 which came into effect on 21st May 2024.
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26/00931/FUL Granted
South Barn Willowdene Fletchers Lane Sidlesham West Sussex PO20 7QG
Erection of 1 no. 3 bed dwelling - alternative to planning permission SI/23/01011/FUL.
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26/00931/FUL Granted
South Barn Willowdene Fletchers Lane Sidlesham West Sussex PO20 7QG
Erection of 1 no. 3 bed dwelling - alternative to planning permission SI/23/01011/FUL.
Other lawful development applications
In South Downs National Park
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26/01569/PLD Awaiting decision
19 Whyke Close Chichester West Sussex PO19 8BB
Single-storey side extension.
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26/01563/PLD Awaiting decision
15 Alexandra Road Chichester West Sussex PO19 7LX
Proposed lawful development - loft conversion with rear dormer and 3 no. roof lights to front roof slope.
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26/01550/ELD Awaiting decision
Marsh Farm Vinnetrow Road Runcton Chichester West Sussex PO20 1QD
Existing lawful development - use as a caravan site for 8 no. caravans for residential occupation by nursery workers and retention of those caravans on site outside growing seasons.
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26/01494/PLD Awaiting decision
St Joseph's Infant School Orchard Gardens Chichester West Sussex PO19 1DG
The proposed use is a SEND school to be operated within use class F1.
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26/01412/ELD Awaiting decision
Amici Main Road Nutbourne Chichester West Sussex PO18 8RL
Existing lawful development certificate for two storey side/rear extension, alterations and additions to existing house to include new gate and piers.