55 High Dells Hatfield AL10 9JD

1. 5 May 2026

   Received by Welwyn Hatfield

2. 22 Jun 2026

   Validated

   Checked as complete and ready for consideration.

3. 24 Jul 2026

   Added to PlanIndex

4. 14 Aug 2026

   Decision issued: Granted

Welwyn Hatfield granted permission on 14 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.

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.

• 10 High Dells Hatfield AL10 9HU

  6/2023/0559/PN8 Submitted 13 Mar 2023 50 yards away

  Prior approval for the erection of a single storey rear extension measuring 4.6m in depth, 2.7m in height and 2.5m to the eaves

  Granted Prior approval Extension
  Small domestic

• 24 High Dells Hatfield Hertfordshire AL10 9HU

  6/2023/0486/LAWE Submitted 3 Mar 2023 100 yards away

  Certificate of lawfulness for the existing use of HMO

  Granted Lawful development

• 42 High Dells Hatfield AL10 9HU

  6/2024/1868/LAWE Submitted 30 Sep 2024 100 yards away

  Certificate of lawfulness for the existing use of HMO

  Granted Lawful development

• 64 Bishops Rise Hatfield Hertfordshire AL10 9HH

  6/2022/2783/PN8 Submitted 8 Dec 2022 250 yards away

  Prior approval for flat roof single storey rear extension measuring 6m in depth, 3m in height and 2.4m to the eaves

  Granted Prior approval Extension
  Small domestic

• 72 Bishops Rise Hatfield Hertfordshire AL10 9HH

  6/2023/0656/LAWP Submitted 23 Mar 2023 250 yards away

  Certificate of lawfulness for a proposed rear extension, following the demolition of existing conservatory

  Granted Lawful development Extension Demolition

• 78 Bishops Rise Hatfield A10 9HH

  6/2024/1920/HOUSE Submitted 8 Oct 2024 250 yards away

  Erection of a single storey rear and side extension, alterations to openings

  Granted Householder Extension
  Small domestic

• 6/2026/1370/LAWP Granted

  17-17A Mill Lane Welwyn AL6 9EU

  Certificate of lawfulness for the change of use of offices to 3 x 2 bedroom flats

  Received 3 Aug, published by the council 15 Aug 2026 Lawful development
• 6/2026/1218/LAWP Granted

  43 Great Ley Welwyn Garden City AL7 4TJ

  Certificate of lawfulness for rear dormer roof extension to form a loft conversion

  Received 13 Jul, published by the council 9 Aug 2026 Lawful development
• 6/2026/1250/LAWP Granted

  40 Dellsome Lane Welham Green Hatfield AL9 7ND

  Certificate of lawfulness for Class A - Larger single storey rear extension (previously subject to prior approval application ref: 6/25/1851/PN8), Class B - Roof extension/hip to gable conversion, Class C - Other alterations to roof

  Received 16 Jul, published by the council 9 Aug 2026 Lawful development
• 6/2026/1210/LAWE Refused

  9 Flamingo Close Hatfield AL10 9LU

  Certificate of lawfulness for the existing use of the property as a HMO (Use Class C4) in continuous use for over 10 years

  Received 10 Jul, published by the council 9 Aug 2026 Lawful development
• 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

  Received 27 Apr, published by the council 24 Jul 2026 Lawful development