27 Marlborough Close Welwyn AL6 0UG

1. 16 Nov 2022

   Received by Welwyn Hatfield

2. 17 Nov 2022

   Validated

   Checked as complete and ready for consideration.

3. 13 Feb 2023

   Decision issued: Granted

4. 9 Aug 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.

Householder applications cover work to an existing house and its garden: extensions, loft and garage conversions, porches, outbuildings and similar alterations within the boundary of the home. They cannot be used to create a separate dwelling or change what the building is used for. Councils aim to decide them within eight weeks, and immediate neighbours are usually notified and given a chance to comment.

More on householder applications in our guide

• 24 Marlborough Close Welwyn Hertfordshire AL6 0UG

  6/2023/0085/TPO Submitted 12 Jan 2023 58m away

  Oak tree G2 TPO 643 (2017) - 4m reduction from top of tree, 25% reduction in width and removal of deadwood. The tree overhangs a public footpath behind our garden.

  Refused Trees

• 16 Mardley Avenue Welwyn AL6 0UD

  6/2023/0670/TPO Submitted 24 Mar 2023 80m away

  Fell T1 dead Horse Chestnut within TPO 24 Area 3

  Granted Trees

• 20 Mardley Avenue Welwyn AL6 0UD

  6/2026/1305/TPO Submitted 27 Jul 2026 88m away

  98% historically approved · decision due ~30 Sep

  Up to a 2m reduction to Cherry tree, to maintain its healthy station and prevent over extension, from growing too large. Fell, process and remove Yew tree as resident has concerns that if it was to uproot or fail it would hit the house due to its location (covered by TPO 24 A3)

  Awaiting decision Trees

• 16 Marlborough Close Welwyn AL6 0UG

  6/2026/0351/HOUSE Submitted 26 Feb 2026 94m away

  Erection of single storey porch extension, garage conversion, first floor front extension with replacement dormer roof, enlarged first floor rear dormers, reroofing whole roof with a slate coloured plain tile and rendering of front elevation

  Granted Householder Extension Loft or dormer
  Small domestic

• 45 Robbery Bottom Lane Welwyn AL6 0UL

  6/2021/0950/HOUSE Submitted 24 Mar 2021 125m away

  Erection of single storey side garage extension to facilitate garage into habitable space.

  Refused Householder Extension
  Small domestic

• 19 Robbery Bottom Lane Welwyn AL6 0UL

  6/2021/1409/HOUSE Submitted 4 May 2021 130m away

  Demolition of existing rear terrace and construction of part side, part rear double storey extension with associated dormer windows and single storey front extension.

  Granted Householder Extension Loft or dormer +2
  Small domestic

• 6/2026/1228/HOUSE Granted

  109 Mount Way Welwyn Garden City AL7 4LA

  Erection of single storey front extension

  13 Jul 2026 Householder
• 6/2026/1011/HOUSE Granted

  5 Brookside Crescent Cuffley Potters Bar EN6 4QW

  Erection of rear extension, single storey side extension, new porch, additions/alterations to windows on side elevation and demolition of garage

  9 Jun 2026 Householder
• 6/2026/0703/HOUSE Granted

  57 Great North Road Brookmans Park AL9 6LA

  Erection of part double part single storey rear extension, single storey front porch extension, raising of roof and eaves to accommodate loft conversion, alterations to materials and fenestration, erection of front boundary wall and gates

  20 Apr 2026 Householder
• 6/2026/0534/HOUSE Refused

  16 Chipmunk Chase Hatfield AL10 9GH

  Retention of single storey rear extension and garage conversion to study/office

  24 Mar 2026 Householder
• 6/2026/1175/HOUSE Granted

  5A Honeycroft Welwyn Garden City AL8 6HR

  Erection of a single storey rear extension, alterations to opening on side elevation and garden room with covered area following demolition of conservatory

  7 Jul 2026 Householder