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.

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

  6/2026/0655/LAWP Submitted 13 Apr 2026 151m 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 172m 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 173m 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 174m 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 184m away

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

  Granted Heritage and listed buildings 1 doc

• 12 Harpsfield Broadway Hatfield AL10 9TF

  6/2022/1444/FULL Submitted 21 Jun 2022 196m away

  Erection of part two, part three storey rear extension with mansard roof and conversion to 8 flats comprising 6 x 2-bed and 2 x studio

  Granted Full applications New dwelling Extension +1
  Several homes

• 6/2026/1555/COND Awaiting decision

  58 Bell Lane Brookmans Park AL9 7AY

  Submission of details pursuant to condition number 5 (energy statement) on planning permission 6/2025/2133/FULL

  Received 7 Sep, published by the council 14 Sep 2026 Conditions
• 6/2026/0273/COND Granted

  Land at Green Close 1 Green Close Brookmans Park Hatfield AL9 7ST

  Submission of details pursuant to condition number 1 (Construction Management Plan), 2 (Site hours), 3 (Approved scheme of remediation), 4 (Materials samples), 7 (Hard and soft landscape scheme), 11 (Refuse bin and recycling), 12 (Obscure glazing), 13 (First floor window glazing), 15 (EV charging), 16. (Secure cycle parking) on planning permission 6/2022/2387/FULL

  Received 17 Feb, published by the council 24 Jul 2026 Conditions
• 6/2026/1319/COND Granted

  30 Barleycroft Road Welwyn Garden City AL8 6JU

  Submission of details pursuant to condition 2 (windows, doors and velux) on planning application 6/2024/1734/HOUSE

  Received 28 Jul, published by the council 9 Aug 2026 Conditions
• 6/2026/0942/COND Granted

  The Coach and Horses 61 Newgate Street Village Hertford SG13 8RA

  Submission of details pursuant to condition number 1 (Construction Method Statement) & 2 (Archaeological Written Scheme of Investigation) on planning permission 6/2022/1957/FULL

  Received 29 May, published by the council 24 Jul 2026 Conditions
• 6/2026/1527/COND Awaiting decision

  Land at Hollybush Lane to the east of A1000 and north of Ascots Lane Welwyn Garden City AL7 4EG

  Submission of details pursuant to condition numbers 1 (Construction Environmental Management Plan), 2 (Arboricultural Method Statement and Tree Protection Plan), 3 (Construction Method Statement - Phase 2 only) and 4 (Site Waste Management Plan) on planning permission 6/2025/1024/RM

  Received 1 Sep, published by the council 13 Sep 2026 Conditions