European Knowledge Centre Eisai Limited Mosquito Way Hatfield AL10 9SN

1. 20 Feb 2026

   Received by Welwyn Hatfield

2. 23 Feb 2026

   Validated

   Checked as complete and ready for consideration.

3. 24 Jul 2026

   Added to PlanIndex

4. 7 Aug 2026

   Decision issued: Granted

Welwyn Hatfield granted permission on 7 August 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.

This application deals with conditions on an existing permission, supplying the details a condition requires or asking to vary or remove one, without reopening the permission itself. More in our guide to planning application types.

• European Knowledge Centre Eisai Manufacturing Mosquito Way Hatfield AL10 9SN

  6/2021/2034/FULL Submitted 5 Jul 2021 100 yards away

  Installation of three storage containers

  Granted Full applications

• Former British Aerospace Gatehouse Immediately South of Staff Mess Comet Way Hatfield AL10 0XR

  6/2026/0655/LAWP Submitted 13 Apr 2026 150 yards away

  Certificate of lawfulness for the rendering of external walls and installation of protective capping over coping and to inside face of parapet

  Refused Lawful development

• Hertfordshire Constabulary Central Area Headquarters And Hatfield Police Station Comet Way Hatfield AL10 9SJ

  6/2026/0617/TPO Submitted 8 Apr 2026 200 yards away

  T9 Weeping willow to remove limb with large hollow at approximately 2m SE side. T10 Weeping willow to remove large central limb growing towards police station. Covered by TPO 701 (2017)

  Granted Trees

• Hertfordshire Constabulary Central Area Headquarters And Hatfield Police Station Comet Way Hatfield AL10 9SJ

  6/2023/0330/TPO Submitted 10 Feb 2023 200 yards away

  T9-T10 Willow x 2. Re pollard back to historic points. Trees covered by TPO 701 (2017)

  Granted Trees

• Blocks 1 - 4 Comet Square Hatfield AL10 9RA

  6/2023/0838/LAWP Submitted 19 Apr 2023 200 yards away

  Certificate of lawfulness for the replacement of PIR insulation with mineral wool insulation under cladding, replace uPVC spandrel panel with matching aluminium and replace timber decking to balconies with brown aluminium

  Granted Lawful development 1 doc

• Hatfield Police Station Comet Way Hatfield AL10 9SJ

  6/2026/0285/LB Submitted 19 Feb 2026 200 yards away

  Installation of various illuminated signage and logos mounted on standalone totems and building façade

  Granted Heritage and listed buildings 1 doc

• 6/2026/1206/COND Granted

  Land south of Welham Manor and west of Station Road, including 26 Station Road Welham Green AL9 7EL

  Submission of details pursuant to condition 10 (Landscaping) on planning application 6/2024/2418/MAJ

  Received 10 Jul, published by the council 24 Jul 2026 Conditions
• 6/2026/1419/COND Granted

  Howe Dell School The Runway Hatfield AL10 9AH

  Submission of details pursuant to Condition 1 (Biodiversity Gain Plan), Condition 2 (Landscape and Ecological Management Plan (LEMP)), Condition 3 (Construction Traffic Management Plan (CTMP)) and Condition 4 (Tree Survey, Arboricultural Method Statement and Tree Protection Strategy) on planning permission 6/2026/0478/FULL

  Received 11 Aug, published by the council 22 Aug 2026 Conditions
• 6/2026/1537/COND Granted

  Land south of Welham Manor and west of Station Road, including 26 Station Road Welham Green AL9 7EL

  Submission of details pursuant to Condition 15 (Fire Hydrants) on planning permission 6/2024/2418/MAJ

  Received 3 Sep, published by the council 22 Sep 2026 Conditions
• 6/2026/1402/COND Granted

  Wytmead Essendon Hill Essendon Hatfield AL9 6AW

  Submission of details pursuant to Condition 1 (samples of the roof tiles) and condition 3 (rooflights) on listed building consent 6/2026/0690/LB

  Received 7 Aug, published by the council 31 Aug 2026 Conditions
• 6/2026/1693/COND Awaiting decision

  114 Parkway Welwyn Garden City AL8 6HN

  Submission of details pursuant to Condition 1 (details of block paving) and 2 (drawings of doors, rooflight and windows) on planning permission 6/2026/0403/HOUSE

  Received 25 Sep, published by the council 7 Oct 2026 Conditions