18 Sycamore Avenue Hatfield Hertfordshire AL10 8LZ

1. 21 Nov 2022

   Received by Welwyn Hatfield

2. 16 Jan 2023

   Decision issued: Granted

3. 9 Aug 2026

   Added to PlanIndex

Welwyn Hatfield granted permission on 16 January 2023, 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.

• 12 Sycamore Avenue Hatfield AL10 8LZ

  6/2024/2005/PN8 Submitted 18 Oct 2024 50 yards away

  Prior approval for the erection of a single storey rear extension measuring 5.9m in depth, 3m in height and 2.6m to the eaves

  Refused Prior approval Extension
  Small domestic

• 12 Sycamore Avenue AL10 8LZ

  6/2024/2271/PN8 Submitted 26 Nov 2024 50 yards away

  Prior approval for the erection of a single storey rear extension measuring 5.9m in depth, 2.9m in height and 2.5m to the eaves

  Granted Prior approval Extension
  Small domestic

• 12 Sycamore Avenue Hatfield AL10 8LZ

  6/2024/1548/HOUSE Submitted 14 Aug 2024 50 yards away

  Erection of part single, part two storey rear extension

  Refused Householder Extension
  Domestic

• 96 Briars Lane Hatfield AL10 8EY

  6/2021/1146/HOUSE Submitted 8 Apr 2021 100 yards away

  Single storey front extension and alterations to fenestration on existing first floor front elevation

  Granted Householder Extension Windows or glazing
  Small domestic

• 17 Sycamore Avenue Hatfield AL10 8LZ

  6/2026/1031/HOUSE Submitted 12 Jun 2026 100 yards away

  Erection of a part single storey, part two-storey rear extension, garage conversion, front porch extension, alterations to fenestration and external materials

  Withdrawn Householder Extension Windows or glazing
  Small domestic

• 71 Briars Lane Hatfield AL10 8EX

  6/2026/1336/HOUSE Submitted 30 Jul 2026 150 yards away

  Erection of a single storey side extension

  Granted Householder Extension
  Small domestic

• 6/2026/1287/LAWE Refused

  Woodhurst Farm, Stables Cattlegate Road Northaw Potters Bar EN2 8AU

  Certificate of Lawfulness for existing use of a former agricultural building (Barn) as a self- contained single residential dwelling house (Use Class C3) following its conversion and continuous occupation for a period in excess of 10 years prior to the date of this application

  Received 22 Jul, published by the council 9 Aug 2026 Lawful development
• 6/2026/1306/LAWP Granted

  184 Unit 4 St Albans Road West Hatfield AL10 0TF

  Certificate of lawfulness for the change of use of the front office portion of Unit 4 to a daycare/crèche facility, to include an internal mezzanine, within Use Class E.

  Received 27 Jul, published by the council 22 Aug 2026 Lawful development
• 6/2026/1328/LAWP Granted

  41 Great North Road Welwyn Garden City AL8 7TJ

  Certificate of lawfulness for a proposed hip to gable loft conversion with rear facing dormer and single storey side extension, plus insertion of rooflight to front elevation

  Received 29 Jul, published by the council 9 Aug 2026 Lawful development
• 6/2026/1288/LAWE Granted

  1 The Limberlost Welwyn AL6 9TS

  Certificate of existing lawfulness for a single storey extension

  Received 22 Jul, published by the council 22 Aug 2026 Lawful development
• 6/2026/1297/LAWE Granted

  White Lodge Farm The Bellbrook Bulls Lane Hatfield AL9 7AZ

  Certificate of lawfulness in relation to existing gate and fencing

  Received 23 Jul, published by the council 9 Aug 2026 Lawful development