4 Marlborough Close Welwyn AL6 0UG

1. 16 Apr 2026

   Received by Welwyn Hatfield

2. 10 Jun 2026

   Decision issued: Granted

3. 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

• 26 Lower Mardley Hill Welwyn AL6 0UQ

  6/2021/0972/HOUSE Submitted 25 Mar 2021 47m away

  Erection of two storey side and rear extensions and a first floor rear extension, insertion of 6 x side facing dormer windows and 3 x side facing roof lights to facilitate extension of existing first floor plan. Alterations to fenestration on existing front, side and rear elevations and demolition of outbuilding attached to existing garage, to facilitate erection of new detached outbuilding.

  Refused Householder Extension Loft or dormer +2
  Small domestic

• 9 Mardley Hill Welwyn AL6 0UE

  6/2026/1198/HOUSE Submitted 10 Jul 2026 49m away

  83% historically approved · decision due ~4 Sep

  Erection of single storey front, side and rear extension, raising the existing roof and formation of rear dormer. Alterations to the fenestration, including, installation of new windows and doors and external rendering and cladding, following the demolition of garage and porch

  Awaiting decision Householder Extension Loft or dormer +2
  Small domestic

• 1A Marlborough Close Welwyn AL6 0UG

  6/2022/2782/HOUSE Submitted 7 Dec 2022 57m away

  Erection of front porch, and part two, part single storey side and rear extension incorporating conversion of existing garage space and elongation of existing rear dormer window. Elongation of front dormer window and external alterations. Change of external materials and landscape works

  Granted Householder Extension Loft or dormer +1 2 docs
  Small domestic

• 16 Marlborough Close Welwyn AL6 0UG

  6/2026/0351/HOUSE Submitted 26 Feb 2026 89m 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

• 19 Robbery Bottom Lane Welwyn AL6 0UL

  6/2021/1409/HOUSE Submitted 4 May 2021 99m 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

• 2A Hangmans Lane Welwyn AL6 0TJ

  6/2024/1845/TPO Submitted 25 Sep 2024 101m away

  TPO 677 (2017) - Trim oak tree by 25% - 30% of the total existing tree cover. In particular cutting back some of the longer branches overhanging the road.

  Granted Trees

• 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