50 Great Ley Welwyn Garden City AL7 4TL

1. 25 Jun 2021

   Received by Welwyn Hatfield

2. 3 Aug 2021

   Decision issued: Refused

3. 30 Jul 2026

   Added to PlanIndex

Welwyn Hatfield refused this application for the reasons on the decision notice; only the applicant can appeal, and refused schemes often return in revised form. 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.

• 57 Hollybush Lane Welwyn Garden City AL7 4JH

  6/2021/2201/HOUSE Submitted 21 Jul 2021 100 yards away

  Erection of single storey rear extension

  Refused Householder Extension
  Small domestic

• 43 Great Ley Welwyn Garden City AL7 4TJ

  6/2026/1218/LAWP Submitted 13 Jul 2026 150 yards away

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

  Granted Lawful development Extension Loft or dormer

• 3 Old Dairy Yard Welwyn Garden City AL7 4BY

  6/2024/0933/HOUSE Submitted 20 May 2024 200 yards away

  Installation of air source heat pump

  Granted Householder
  Domestic

• 4 Old Dairy Yard Welwyn Garden City AL7 4BY

  6/2026/0337/HOUSE Submitted 23 Feb 2026 200 yards away

  Erection of first floor rear extension, loft conversion with dormers to front and rear and insertion of roof lights

  Granted Householder Extension Loft or dormer
  Domestic

• 14 Four Acres Welwyn Garden City AL7 4NW

  6/2020/1680/LAWP Submitted 13 Jul 2020 250 yards away

  Certificate of Lawfulness for erection of summer house in rear garden

  Refused Lawful development

• 60 Sir John Newsom Way Welwyn Garden City AL7 4FL

  6/2025/0628/FULL Submitted 1 Apr 2025 250 yards away

  Erection of a detached two-storey building compromising 2 x 2 bedroom flats

  Withdrawn Full applications New dwelling

• 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