15 Mardley Wood Welwyn AL6 0UY

1. 2 Jul 2021

   Received by Welwyn Hatfield

2. 26 Aug 2021

   Decision issued: Refused

3. 25 Aug 2026

   Added to PlanIndex

The council refused this application for the reasons set out on the decision notice, which the council portal holds in full. Only the applicant can appeal a refusal; the time limit runs from the decision date and is shorter for householder schemes.

Refusal does not prevent a fresh attempt. Applicants often address the reasons for refusal and resubmit, so a refused scheme is not necessarily the end of proposals for the site.

A lawful development certificate is a legal determination, not a planning judgement. It asks the council to confirm either that existing use or works are lawful, often through the passage of time, or that a proposal would not need planning permission at all. The applicant must prove the facts; the merits of the scheme are not considered.

More on lawful development applications in our guide

• 3 Heathlands Welwyn AL6 0UU

  6/2026/0560/HOUSE Submitted 26 Mar 2026 111m away

  Erection of rear and side single-storey extension with conversion of garage to habitable accommodation

  Granted Householder Extension
  Small domestic

• 3 Heathlands Welwyn AL6 0UU

  6/2023/0478/HOUSE Submitted 2 Mar 2023 116m away

  Erection of two storey side extension

  Refused Householder Extension
  Domestic

• 14 Mardley Wood Welwyn AL6 0UX

  6/2021/1443/TPO Submitted 7 May 2021 171m away

  Crown lift 3 x Oak trees (T1-3) and 2 x Larch trees (T4, T6), T7)by 3m and remove dead wood, fell 2 x Larch trees (T5, T9) to ground level, reduce 1 x Larch tree (T8) by 20% covered by TPO

  Granted Trees

• 5A Roundabout Lane Welwyn AL6 0TH

  6/2024/1324/TPO Submitted 10 Jul 2024 177m 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

• 18 Briary Wood Lane Welwyn AL6 0TF

  6/2026/1376/HOUSE Submitted 4 Aug 2026 185m away

  83% historically approved · decision due ~1 Oct

  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

  Awaiting decision Householder Extension Loft or dormer
  Small domestic

• 2A Hangmans Lane Welwyn AL6 0TJ

  6/2024/1845/TPO Submitted 25 Sep 2024 198m 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

• 6/2026/0735/LAWE Refused

  1 Northaw Place Coopers Lane Northaw Potters Bar EN6 4NQ

  Certificate of lawfulness for the existing use of the land as residential garden land ancillary to the dwellinghouse continuously since 2012

  27 Apr 2026 Lawful development
• 6/2026/1132/LAWE Refused

  19 Cunningham Avenue Hatfield AL10 9LR

  Certificate of existing lawfulness of a 5 person HMO since 6 April 2006

  30 Jun 2026 Lawful development
• 6/2026/1506/LAWP Awaiting decision

  Gosmore Brocket Road Welwyn Garden City AL8 7TT

  Erection of single storey side extensions x 2 and two storey rear extension

  27 Aug 2026 Lawful development
• 6/2026/1503/LAWE Awaiting decision

  27 Batterdale Hatfield AL9 5JG

  Certificate of lawfulness for the existing like-for-like replacement of damaged and aged windows on the front and rear elevations

  26 Aug 2026 Lawful development
• 6/2026/1044/LAWP Granted

  5 Peartree Court Welwyn Garden City AL7 3XN

  Certificate of lawfulness for the change of use from C3 (dwellinghouse) to C4 (HMO for up to 6 unrelated residents)

  15 Jun 2026 Lawful development