16 Mardley Avenue Welwyn AL6 0UD

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

• 6/2026/1570/HOUSE Awaiting decision

  16 Mardley Avenue Welwyn AL6 0UD

  Proposed loft conversion, enlargement of the existing roof with increase in ridge height to form a truncated hipped roof, installation of two front dormers, a rear dormer with a rear balcony, and associated rooflights

  Submitted 9 Sep 2026 Householder

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

Welwyn Hatfield granted permission on 17 April 2023, 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.

Applications for works to trees cover protected trees: consent under a tree preservation order, or six weeks notice for trees in a conservation area. More in our guide to planning application types.

• 16 Mardley Avenue Welwyn AL6 0UD

  6/2026/1570/HOUSE Submitted 9 Sep 2026 50 yards away

  87% historically approved · decision due ~4 Nov

  Proposed loft conversion, enlargement of the existing roof with increase in ridge height to form a truncated hipped roof, installation of two front dormers, a rear dormer with a rear balcony, and associated rooflights

  Awaiting decision Householder Loft or dormer Roofing
  Domestic

• 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  Withdrawn Trees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

• 6/2026/1523/EMT Granted

  5 Hitherway Welwyn Garden City AL8 7RG

  4 x Whitebeams to fell. No replanting

  Received 1 Sep, published by the council 13 Sep 2026 Trees
• 6/2026/1514/TPO Granted

  6A Wendover Drive Welwyn AL6 9LT

  T1 1 x Beech to remove in sections to ground level - Tree is almost dead and in poor condition T2 1 x Beech to reduce to clear property by 1.5m - Branches rubbing on property

  Received 27 Aug, published by the council 13 Sep 2026 Trees
• 6/2026/1300/EMT Granted

  1 Perrywood Walden Road Welwyn Garden City AL8 7PZ

  G1 - 2 x Beech and 3 x Hornbeams all hanging low over the footpath and road. Crown lift to 4m. T2 - Hornbeam growing very close to the building and low over the drive. To reduce back on building side by 1.5m and crown lift over the road to 4m.

  Received 23 Jul, published by the council 9 Aug 2026 Trees
• 6/2026/1495/EMT Granted

  2 Valley Road Welwyn Garden City AL8 7DF

  1 x Holly to reduce height by approx 3m height 1 x Lawson Cypress to reduce by approx 2.5m in height 1 x Plum to reduce height by approx 3m 1 x Apple to reduce lateral branches by approx 2m to reduce lateral branches over lawn 1 x Ash to reduce lateral branches over lawn area by approx 2m

  Received 25 Aug, published by the council 7 Sep 2026 Trees
• 6/2026/1497/TC Granted

  2 Valley Road Welwyn Garden City AL8 7DF

  1 x Holly to reduce height by approximately 3m height 1 x Lawson cypress to reduce by approximately 2.5m in height. 1 x Plum to reduce height by approximately 3m Above 3 are domination side of the garden, they are thick dense and evergreen. Reducing to allow more light into garden and control the size 1 x Apple to reduce lateral branches over lawn area by approximately 2m to reduce lateral branches over lawn to maintain size of tree & provide more space and light to lawn area 1 x Ash to reduce lateral branches over lawn area by approximately 2m to reduce lateral branches as now crossing half the garden and blocking light

  Received 25 Aug, published by the council 14 Sep 2026 Trees