14 Duncan Close Welwyn Garden City AL7 3XP

1. 24 Apr 2023

   Received by Welwyn Hatfield

2. 5 May 2023

   Decision issued: Granted

3. 7 Sep 2026

   Added to PlanIndex

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.

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

• 29 Ethelred Close Welwyn Garden City AL7 3QF

  6/2021/1895/EMH Submitted 21 Jun 2021 76m away

  Erection of single storey garden room following demolition of existing one

  Granted Householder Demolition
  Small domestic

• 45 Mill Green Road Welwyn Garden City AL7 3UX

  6/2021/1587/EMT Submitted 18 May 2021 108m away

  1 x Eucalyptus to reduce by 3m height & 2.5m width.

  Granted Trees

• 45 Mill Green Road Welwyn Garden City AL7 3UX

  6/2021/1581/TC Submitted 18 May 2021 108m away

  1 x Eucalyptus to reduce by 3m height & 2.5m width.

  Granted Trees

• 7A Mill Green Road Welwyn Garden City AL7 3UU

  6/2026/0506/EM Submitted 18 Mar 2026 119m away

  Installation of a conservatory at rear of property

  Granted Extension

• 7A Mill Green Road Welwyn Garden City AL7 3UU

  6/2026/0497/HOUSE Submitted 17 Mar 2026 119m away

  Installation of conservatory at rear

  Granted Householder Extension
  Small domestic

• 17 Bedwell Close Welwyn Garden City AL7 3XH

  6/2024/1965/HOUSE Submitted 14 Oct 2024 167m away

  Installation of air source heat pump

  Granted Householder
  Domestic

• 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