9 Mardley Hill Welwyn AL6 0UE

1. 10 Jul 2026

   Received by Welwyn Hatfield

2. 24 Jul 2026

   Added to PlanIndex

3. 15 Aug 2026

   Status changed to Under Consideration

   Previously Under Consultation.

4. 11 Sep 2026

   Decision issued: Granted

Welwyn Hatfield granted permission on 11 September 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.

Householder applications cover work to an existing house and its garden, such as extensions, lofts and outbuildings, and cannot create a separate dwelling or change what the building is used for. More in our guide to planning application types.

• 1A Marlborough Close Welwyn AL6 0UG

  6/2022/2782/HOUSE Submitted 7 Dec 2022 36m 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

• 4 Marlborough Close Welwyn AL6 0UG

  6/2026/0674/HOUSE Submitted 16 Apr 2026 49m away

  Erection of single storey rear infill extension

  Granted Householder Extension
  Small domestic

• 2A Hangmans Lane Welwyn AL6 0TJ

  6/2024/1845/TPO Submitted 25 Sep 2024 64m 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

• 26 Lower Mardley Hill Welwyn AL6 0UQ

  6/2021/0972/HOUSE Submitted 25 Mar 2021 89m 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

• 16 Marlborough Close Welwyn AL6 0UG

  6/2026/0351/HOUSE Submitted 26 Feb 2026 103m 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 134m 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

• 6/2026/1257/HOUSE Granted

  21 The Swallows Welwyn Garden City AL7 1BX

  Garage conversion with alterations to openings to front and rear elevations

  17 Jul 2026 Householder
• 6/2026/1293/HOUSE Granted

  33 Claves Crescent Welwyn Garden City AL7 1WN

  Erection of a single storey rear conservatory

  22 Jul 2026 Householder
• 6/2026/1202/HOUSE Granted

  40 Cecil Crescent Hatfield AL10 0HG

  Erection of single storey rear extension

  10 Jul 2026 Householder
• 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