18 Briary Wood Lane Welwyn AL6 0TF

1. 4 Aug 2026

   Received by Welwyn Hatfield

2. 6 Aug 2026

   Validated

   Checked as complete and ready for consideration.

3. 22 Aug 2026

   Added to PlanIndex

4. Decision

   Awaiting decision

   Decision expected by 1 October 2026, 8 weeks from validation under the statutory target for most applications. Extensions of time are common and are agreed case by case.

   Welwyn Hatfield took a median of 58 days over the applications it decided in the last year.

This application is with Welwyn Hatfield for determination. The council publicises it, consults neighbours and technical bodies where required, and weighs the responses against local and national planning policy.

The statutory target is eight weeks for most applications and thirteen for major development, though extensions of time are common. Comments carry most weight while the case is undecided, so check the council portal for the deadline if you want to respond.

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

• 5A Roundabout Lane Welwyn AL6 0TH

  6/2024/1324/TPO Submitted 10 Jul 2024 52m away

  TPO 915 (2018) T1 (Hornbeam) Re-coppice of Hornbeam to approximately 2m to allow adequate re growth. Old Hornbeam stool is close to the garage and has signs of decay from previous pruning wounds. Also a potential inclusion on the south side.

  Refused Trees

• 2A Hangmans Lane Welwyn AL6 0TJ

  6/2024/1845/TPO Submitted 25 Sep 2024 168m 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

• 21E Canonsfield Welwyn AL6 0QB

  6/2021/1878/HOUSE Submitted 18 Jun 2021 183m away

  Erection of a part two storey front extension

  Refused Householder Extension
  Domestic

• 15 Mardley Wood Welwyn AL6 0UY

  6/2021/2017/LAWP Submitted 2 Jul 2021 185m away

  Erection of a single storey front extension and a single storey rear extension, following the demolition of existing front porch canopy and rear conservatory, plus alterations to fenestration to existing front and side elevations.

  Refused Lawful development Extension Demolition +1
  Small domestic

• 9 Mardley Hill Welwyn AL6 0UE

  6/2026/1198/HOUSE Submitted 10 Jul 2026 231m 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

• 23 Heathbrow Road Welwyn AL6 0QG

  6/2021/1671/HOUSE Submitted 25 May 2021 242m away

  Erection of single storey rear extension

  Granted Householder Extension
  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