16 Mardley Avenue Welwyn AL6 0UD

This site has had 2 applications since 2023: 1 approved, 0 refused.

• 6/2023/0670/TPO Granted

  16 Mardley Avenue Welwyn AL6 0UD

  Fell T1 dead Horse Chestnut within TPO 24 Area 3

  Decided 17 Apr 2023 Trees

1. 9 Sep 2026

   Received by Welwyn Hatfield

2. 22 Sep 2026

   Added to PlanIndex

3. Decision

   Awaiting decision

   Decision expected by 4 November 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, against a statutory target of eight weeks. Over the last year Welwyn Hatfield decided householder applications in a median of 59 days. More in our guide to how long planning decisions take.

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.

• 16 Mardley Avenue Welwyn AL6 0UD

  6/2023/0670/TPO Submitted 24 Mar 2023 50 yards 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 50 yards away

  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)

  Withdrawn Trees

• 27 Marlborough Close Welwyn AL6 0UG

  6/2022/2612/HOUSE Submitted 16 Nov 2022 100 yards away

  Erection of a part single storey, part first floor side extension with installation of roof lights

  Granted Householder Extension Loft or dormer 4 docs
  Small domestic

• 23 Marlborough Close Welwyn Hertfordshire AL6 0UG

  6/2023/0571/HOUSE Submitted 14 Mar 2023 100 yards away

  Erection of a single storey side extension following demolition of rear conservatory

  Granted Householder Extension Demolition
  Small domestic

• 8A Rosecroft Lane Welwyn AL6 0UB

  6/2021/2578/TPO Submitted 3 Sep 2021 100 yards away

  Fell damaged pine and dead tree covered by TPO 24 ref A3 (Dead and dangerous application)

  Granted Trees

• 28 Mardley Avenue Welwyn AL6 0TZ

  6/2022/2776/HOUSE Submitted 7 Dec 2022 150 yards away

  Erection of single storey part rear extension following the demolition of existing rear conservatory and the continuation of raised patio and partial garage conversion to form larger utility room and ensuite and installation of skylights.

  Granted Householder Extension Demolition
  Small domestic

• 6/2026/1408/HOUSE Granted

  Wytmead Essendon Hill Essendon Hatfield AL9 6AW

  Reinstatement of the previously truncated chimney

  Received 10 Aug, published by the council 31 Aug 2026 Householder
• 6/2026/1170/HOUSE Granted

  6 Highfields Cuffley Potters Bar EN6 4EL

  Conversion of garage into study room with alterations to the front elevation, repositioning of lower ground floor entrance hall, erection of two storey infill side extension with internal alterations, replacement of existing front and side building brickwork with K-Render finish, removal of chimney and installation of 2 rooflights

  Received 6 Jul, published by the council 30 Jul 2026 Householder
• 6/2026/1177/HOUSE Granted

  Red Lodge High Road Essendon Hatfield AL9 6HU

  Erection of two single-storey side extensions, detached garage with barn-hipped roof and photovoltaic panels, relocated garden room and associated works to hardstanding and site layout.

  Received 7 Jul, published by the council 9 Aug 2026 Householder
• 6/2026/1376/HOUSE Granted

  18 Briary Wood Lane Welwyn AL6 0TF

  Erection of a single storey ground floor extension & part two storey rear, raising the roof and alterations to facilitate loft conversion to include new crown roof with front & rear dormers

  Received 4 Aug, published by the council 22 Aug 2026 Householder
• 6/2026/1392/HOUSE Granted

  1 Little Wade Welwyn Garden City AL7 4LE

  Erection of a single storey rear extension

  Received 6 Aug, published by the council 15 Aug 2026 Householder