North Mymms Park Tollgate Road North Mymms Hatfield AL9 7TR

1. 15 Jul 2026

   Received by Welwyn Hatfield

2. 9 Aug 2026

   Added to PlanIndex

3. 22 Aug 2026

   Status changed to Under Consideration

   Previously Under Consultation.

4. Decision

   Awaiting decision

   Decision expected by 9 September 2026, 8 weeks from validation under the statutory target for most applications. Extensions of time are common and are agreed case by case.

   Welwyn Hatfield took a median of 58 days over the applications it decided in the last year.

This application is with Welwyn Hatfield for determination. The council publicises it, consults neighbours and technical bodies where required, and weighs the responses against local and national planning policy.

The statutory target is eight weeks for most applications and thirteen for major development, though extensions of time are common. Comments carry most weight while the case is undecided, so check the council portal for the deadline if you want to respond.

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.

More on lawful development applications in our guide

• Mansion House North Mymms Park Tollgate Road North Mymms Hatfield AL9 7TR

  6/2026/1251/MAJ Submitted 16 Jul 2026 4m away

  81% historically approved · decision due ~27 Oct

  Change of use to wedding venue, conference, ceremonies, corporate events and filming (Retrospective)

  Awaiting decision Full applications
  Major scheme

• North Mymms Park Tollgate Road North Mymms AL9 7TR

  6/2026/0708/VAR Submitted 21 Apr 2026 77m away

  90% historically approved · decision due ~6 Jul

  Variation or removal of Condition 2 (noise limiting system) and removal of Condition 3 (overarching Travel Plan) of planning permission 6/2022/2793/VAR

  Awaiting decision Amendments 1 doc

• 6/2026/0735/LAWE Refused

  1 Northaw Place Coopers Lane Northaw Potters Bar EN6 4NQ

  Certificate of lawfulness for the existing use of the land as residential garden land ancillary to the dwellinghouse continuously since 2012

  27 Apr 2026 Lawful development
• 6/2026/1132/LAWE Refused

  19 Cunningham Avenue Hatfield AL10 9LR

  Certificate of existing lawfulness of a 5 person HMO since 6 April 2006

  30 Jun 2026 Lawful development
• 6/2026/1506/LAWP Awaiting decision

  Gosmore Brocket Road Welwyn Garden City AL8 7TT

  Erection of single storey side extensions x 2 and two storey rear extension

  27 Aug 2026 Lawful development
• 6/2026/1503/LAWE Awaiting decision

  27 Batterdale Hatfield AL9 5JG

  Certificate of lawfulness for the existing like-for-like replacement of damaged and aged windows on the front and rear elevations

  26 Aug 2026 Lawful development
• 6/2026/1044/LAWP Granted

  5 Peartree Court Welwyn Garden City AL7 3XN

  Certificate of lawfulness for the change of use from C3 (dwellinghouse) to C4 (HMO for up to 6 unrelated residents)

  15 Jun 2026 Lawful development