3 Walnut Farm Science Park Lockgate Road Sidlesham West Sussex PO20 7QQ

1. 13 Feb 2026

   Received by South Downs National Park

2. 1 Apr 2026

   Decision issued: PERMIT

3. 27 Jul 2026

   Added to PlanIndex

South Downs National Park granted permission on 1 April 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.

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.

• 3 Walnut Farm Science Park Lockgate Road Sidlesham West Sussex PO20 7QQ

  26/00352/PLD Submitted 13 Feb 2026 0.1 miles away

  Proposed single storey extension to commercial building.

  Granted Lawful development Extension 9 docs
  Small domestic

• Walnut Farm Science Park Lockgate Road Sidlesham West Sussex

  26/01035/FUL Submitted 8 May 2026 0.1 miles away

  81% historically approved · decision due ~10 Jul

  Demolition of existing lean-to building and construction of replacement building within Class E(g) use (office, research, and development and light industry)

  Awaiting decision Full applications Demolition 8 docs

• Units 1 And 2 Walnut Farm Science Park Lockgate Road Sidlesham West Sussex PO20 7QQ

  12/00100/COU Submitted 6 Jan 2012 0.1 miles away

  Storage and preparation of cars.

  Granted Full applications 18 docs

• Units 1 And 2 Walnut Farm Science Park Lockgate Road Sidlesham West Sussex PO20 7QQ

  12/00100/COU Submitted 6 Jan 2012 0.1 miles away

  Storage and preparation of cars.

  Granted Full applications 18 docs

• Willowdene Nursery Fletchers Lane Sidlesham Chichester West Sussex PO20 7QG

  26/00111/PA3Q Submitted 16 Jan 2026 0.1 miles away

  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.

  Awaiting decision Prior approval 12 docs
  Domestic

• Willowdene Nursery Fletchers Lane Sidlesham Chichester West Sussex PO20 7QG

  26/00111/PA3Q Submitted 16 Jan 2026 0.1 miles away

  89% historically approved · decision due ~13 Mar

  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.

  Awaiting decision Prior approval 7 docs
  Domestic

• 26/01405/ELD Awaiting decision

  19 Needlemakers Chichester West Sussex PO19 7JH

  Existing lawful development - conversion of loft space. Including velux windows, flooring and toilet installation.

  Received 26 Jun, published by the council 27 Jul 2026 Lawful development
• SDNP/26/03337/LDE Awaiting decision

  9 East Way Lewes East Sussex BN7 1NG

  Decking at rear

  Received 26 Aug, published by the council 7 Sep 2026 Lawful development
• 26/01268/PLD Granted

  71 Windsor Road Chichester West Sussex PO19 7XG

  Demolition of existing garage and rear conservatory and construction of single-storey rear extension.

  Received 10 Jun, published by the council 27 Jul 2026 Lawful development
• 26/01855/PLD Awaiting decision

  1A Park Lane Selsey Chichester West Sussex PO20 0HD

  Rear dormer and 3 no. front rooflights.

  Received 24 Aug, published by the council 7 Sep 2026 Lawful development
• 26/01842/ELD Awaiting decision

  Smallburgh Bell Lane Birdham Chichester West Sussex PO20 7HX

  Existing lawful development certificate for the use of an outbuilding as a dwellinghouse for a period exceeding 4 years.

  Received 21 Aug, published by the council 7 Sep 2026 Lawful development