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 60 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  Withdrawn Trees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

• 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

• 20 Mardley Heights Welwyn AL6 0SX

  6/2024/1895/TPO Submitted 1 Oct 2024 150 yards away

  2 x Silver birches branches thinned out. Fell 1 x Hornbeam. (TPO 641 G5 (2017))

  Refused Trees

• 6/2026/1316/HOUSE Granted

  178 Knella Road Welwyn Garden City AL7 3NN

  Erection of part single and part two storey rear extension with alterations to openings on rear elevation

  Received 27 Jul, published by the council 22 Aug 2026 Householder
• 6/2026/1252/HOUSE Granted

  31 Brockswood Lane Welwyn Garden City AL8 7BE

  Erection of part single storey part two storey rear extension, garage conversion and installation of air conditioning unit mounted at ground floor on the rear elevation

  Received 16 Jul, published by the council 9 Aug 2026 Householder
• 6/2026/0112/HOUSE Granted

  54 Tolmers Road Cuffley Potters Bar EN6 4JF

  Erection of part two storey and part single storey front and side extensions. Erection of first floor rear extension. Alterations to the roof, including front and rear dormers and rooflights

  Received 26 Jan, published by the council 24 Jul 2026 Householder
• 6/2026/1620/HOUSE Awaiting decision

  68 Tolmers Road Cuffley Potters Bar EN6 4JY

  Erection of front boundary dwarf wall, railings and gated entrances and battened fencing to left and right boundaries to front garden alongside hardstanding to frontage

  Received 17 Sep, published by the council 22 Sep 2026 Householder
• 6/2026/1308/HOUSE Granted

  122 The Commons Welwyn Garden City AL7 4SB

  Proposed conversion of existing garage to habitable room alterations to the roof, erection of a glazed veranda and detached gazebo

  Received 27 Jul, published by the council 9 Aug 2026 Householder