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Planning application

6/2026/1198/HOUSE

9 Mardley Hill Welwyn AL6 0UE

Awaiting decision Welwyn Hatfield HOUSEHOLDER APPLICATION

Proposal

Erection of single storey front, side and rear extension, raising the existing roof and formation of rear dormer. Alterations to the fenestration, including, installation of new windows and doors and external rendering and cladding, following the demolition of garage and porch

As published by the council, reference 6/2026/1198/HOUSE

Timeline

Dates from the published record

  1. 10 Jul 2026

    Received by Welwyn Hatfield

  2. 24 Jul 2026

    Added to PlanIndex

  3. Decision

    Awaiting decision

    The statutory target is eight weeks for most applications and thirteen for major development. Extensions of time are common.

What happens while it is decided

The process from here

This application is with Welwyn Hatfield for determination. The council publicises it, consults neighbours and technical bodies where required, and weighs the responses against local and national planning policy.

The statutory target is eight weeks for most applications and thirteen for major development, though extensions of time are common. Comments carry most weight while the case is undecided, so check the council portal for the deadline if you want to respond.

About householder applications

How this application type works

Householder applications cover work to an existing house and its garden: extensions, loft and garage conversions, porches, outbuildings and similar alterations within the boundary of the home. They cannot be used to create a separate dwelling or change what the building is used for. Councils aim to decide them within eight weeks, and immediate neighbours are usually notified and given a chance to comment.

More on householder applications in our guide

Nearby applications

Within 500 metres

  • 1A Marlborough Close Welwyn AL6 0UG

    Erection of front porch, and part two, part single storey side and rear extension incorporating conversion of existing garage space and elongation of existing rear dormer window. Elongation of front dormer window and external alterations. Change of external materials and landscape works

    7 Dec 2022 36m away Householder
  • 6/2023/0085/TPO Refused

    24 Marlborough Close Welwyn Hertfordshire AL6 0UG

    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.

    12 Jan 2023 141m away Trees
  • 6/2026/0825/TPO Granted

    Brambles Briary Wood End Welwyn AL6 0TD

    TPO 800 T1 - Chestnut tree - crown reduce by approx 4-5m - tree is multi stem and we have recently removed the whole crown on one stem due to being completely dead. Client is worried about the balancing weight now on the other stem. Please see attached photos.

    12 May 2026 251m away Trees
  • 11A Chestnut Walk Welwyn AL6 0SB

    Erection of new rear dormer extension as continuation of existing rear dormer

    24 Jan 2023 263m away Householder
  • 3 Heathlands Welwyn AL6 0UU

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

    26 Mar 2026 300m away Householder
  • 6/2026/0974/TPO Awaiting decision

    2 Woodacre Drive Welwyn AL6 0UA

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

    3 Jun 2026 309m away Trees

In Welwyn Hatfield

  • 9 Hill Rise Cuffley Potters Bar EN6 4ED

    Erection of a part single and part two storey rear extension, garage conversion to habitable use and alterations to fenestration

    24 Oct 2025 Householder
  • 7 Greenfield Hatfield AL9 5HW

    Erection of a single storey rear extension, conversion of double integral garage, covered porch, replacement front dormer and erection of new boundary wall following the removal of the existing hedge

    21 May 2026 Householder
  • 4 Northwood Welwyn Garden City AL7 2PX

    Erection of single storey rear extension and open pergola following demolition of conservatory

    3 Jun 2026 Householder
  • 41 Lemsford Lane Welwyn Garden City AL8 6YN

    Erection of a single storey side/rear extension following the demolition of existing outbuilding

    8 Jun 2026 Householder
  • 6/2026/1293/HOUSE Awaiting decision

    33 Claves Crescent Welwyn Garden City AL7 1WN

    Erection of a single storey rear conservatory

    22 Jul 2026 Householder