16 Mardley Avenue Welwyn AL6 0UD

1. 24 Mar 2023

   Received by Welwyn Hatfield

2. 4 Apr 2023

   Validated

   Checked as complete and ready for consideration.

3. 17 Apr 2023

   Decision issued: Granted

4. 22 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.

Tree applications cover work to protected trees: those under a tree preservation order need consent for pruning or felling, and trees in a conservation area need six weeks written notice before work starts. The council assesses the amenity value of the tree and can refuse consent, approve it with conditions, or in conservation areas make a preservation order in response.

More on trees applications in our guide

• 20 Mardley Avenue Welwyn AL6 0UD

  6/2026/1305/TPO Submitted 27 Jul 2026 29m away

  98% historically approved · decision due ~30 Sep

  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)

  Awaiting decision Trees

• 27 Marlborough Close Welwyn AL6 0UG

  6/2022/2612/HOUSE Submitted 16 Nov 2022 80m 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

• 28 Mardley Avenue Welwyn AL6 0TZ

  6/2022/2776/HOUSE Submitted 7 Dec 2022 115m 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 124m away

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

  Refused Trees

• 2 Woodacre Drive Welwyn AL6 0UA

  6/2026/0974/TPO Submitted 3 Jun 2026 128m away

  T1 Oak Prune western aspect by 2 metres. (Covered by TPO24 A3 and TPO 642 (2017) G1)

  Refused Trees

• 24 Marlborough Close Welwyn Hertfordshire AL6 0UG

  6/2023/0085/TPO Submitted 12 Jan 2023 131m away

  Oak tree G2 TPO 643 (2017) - 4m reduction from top of tree, 25% reduction in width and removal of deadwood. The tree overhangs a public footpath behind our garden.

  Refused Trees

• 6/2026/1095/TPO Granted

  31 Parkside Welwyn AL6 9DQ

  T1 Goat Willow Pollard back to previous trimming points which is approx 3-4m off T2 Cedar Crown reduction by 2-3m approx back to previous pruning points

  24 Jun 2026 Trees
• 6/2026/1531/TPO Awaiting decision

  37 The Ridgeway Cuffley EN6 4BB

  T1 English Oak (Quercus robur) ref T316 fell to ground level

  2 Sep 2026 Trees
• 6/2026/1260/EMT Granted

  77 The Commons Welwyn Garden City AL7 4RZ

  Fell 1 dead Beech tree in rear garden.

  17 Jul 2026 Trees
• 6/2026/1271/TPO Granted

  33 Oaklands Rise Welwyn AL6 0RN

  Removal of dead hornbeam tree. (covered by TPO 673 (2017))

  20 Jul 2026 Trees
• 6/2026/0899/EMT Granted

  10 The Commons Welwyn Garden City AL7 4RP

  4 x conifer reduce to 6ft (1.8m) height. 3 x self set ash, fell & poison. 2 x self set sycamore, fell & poison

  20 May 2026 Trees