17 Sylvandale Welwyn Garden City AL7 2HS

1. 27 Aug 2026

   Received by Welwyn Hatfield

2. 22 Sep 2026

   Added to PlanIndex

3. Decision

   Awaiting decision

   Decision expected by 22 October 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.

• 1 Forresters Drive Welwyn Garden City AL7 2HN

  6/2021/2036/LAWP Submitted 5 Jul 2021 100 yards away

  Certificate of lawfulness to raise the height of existing roof to allow raised ceiling height to match main house

  Refused Lawful development

• 56 Sylvandale Welwyn Garden City AL7 2HT

  6/2021/1818/HOUSE Submitted 11 Jun 2021 200 yards away

  Erection of single storey, part two storey rear extension, insertion of roof light to existing garage's roof to facilitate garage conversion and alterations to fenestration on existing front and rear elevations.

  Granted Householder Extension Loft or dormer +1
  Small domestic

• 19 Birchall Wood Welwyn Garden City AL7 2HL

  6/2023/0180/HOUSE Submitted 25 Jan 2023 200 yards away

  Erection of part single and part two storey rear extension. Single storey front extension, including porch canopy to side, following removal of existing canopy and alterations to window openings to side and front elevations

  Refused Householder Extension Windows or glazing
  Small domestic

• Street Record Birchall Wood Welwyn Garden City AL7 2HL

  6/2022/2866/TPO Submitted 19 Dec 2022 200 yards away

  T771: 1 x Hornbeam coppice to ground level. T775: 1 x Ash coppice to ground level. T770, T795, & T796: 3 x Hornbeam coppice to ground level. (See Arboricultural Assessment Report for more detail) All covered by TPO 691 (2017).

  Granted Trees

• 60 Sylvandale Welwyn Garden City Hertfordshire AL7 2HT

  6/2023/0440/HOUSE Submitted 27 Feb 2023 200 yards away

  Erection of a single storey rear extension with garage conversion

  Granted Householder Extension
  Small domestic

• 59 Lords Wood Welwyn Garden City AL7 2HG

  6/2023/0572/HOUSE Submitted 14 Mar 2023 200 yards away

  Erection of first floor rear extension and proposed bricking up of existing opening on front elevation

  Granted Householder Extension
  Domestic

• 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