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 59 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

• 60 Lords Wood Welwyn Garden City AL7 2HG

  6/2023/0611/HOUSE Submitted 20 Mar 2023 200 yards away

  Erection of single storey front extension

  Granted Householder Extension
  Small domestic

• 6/2026/1408/HOUSE Granted

  Wytmead Essendon Hill Essendon Hatfield AL9 6AW

  Reinstatement of the previously truncated chimney

  Received 10 Aug, published by the council 31 Aug 2026 Householder
• 6/2026/1170/HOUSE Granted

  6 Highfields Cuffley Potters Bar EN6 4EL

  Conversion of garage into study room with alterations to the front elevation, repositioning of lower ground floor entrance hall, erection of two storey infill side extension with internal alterations, replacement of existing front and side building brickwork with K-Render finish, removal of chimney and installation of 2 rooflights

  Received 6 Jul, published by the council 30 Jul 2026 Householder
• 6/2026/1177/HOUSE Granted

  Red Lodge High Road Essendon Hatfield AL9 6HU

  Erection of two single-storey side extensions, detached garage with barn-hipped roof and photovoltaic panels, relocated garden room and associated works to hardstanding and site layout.

  Received 7 Jul, published by the council 9 Aug 2026 Householder
• 6/2026/1376/HOUSE Granted

  18 Briary Wood Lane Welwyn AL6 0TF

  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

  Received 4 Aug, published by the council 22 Aug 2026 Householder
• 6/2026/1392/HOUSE Granted

  1 Little Wade Welwyn Garden City AL7 4LE

  Erection of a single storey rear extension

  Received 6 Aug, published by the council 15 Aug 2026 Householder