9 Calder Avenue Brookmans Park Hatfield AL9 7AH

1. 31 Mar 2021

   Received by Welwyn Hatfield

2. 5 Jul 2021

   Decision issued: Granted

3. 9 Aug 2026

   Added to PlanIndex

Welwyn Hatfield granted permission on 5 July 2021, 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.

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.

• 6 Calder Avenue Brookmans Park AL9 7AQ

  6/2021/1496/HOUSE Submitted 11 May 2021 50 yards away

  Erection of single storey side extension, garage, front canopy and first floor rear extension.

  Granted Householder Extension
  Small domestic

• 6 Calder Avenue Brookmans Park Hertfordshire AL9 7AQ

  6/2023/0273/HOUSE Submitted 3 Feb 2023 50 yards away

  Erection of a first floor rear extension, single storey side and rear extension, front canopy, alteration to fenestration, conversion of garage to habitable space and erection of a detached garage

  Granted Householder Extension Windows or glazing
  Small domestic

• 73 Mymms Drive Brookmans Park AL9 7AA

  6/2026/1550/FULL Submitted 7 Sep 2026 100 yards away

  80% historically approved · decision due ~9 Nov

  Erection of dwelling following demolition of existing dwelling

  Awaiting decision Full applications New dwelling Demolition
  Domestic

• 73 Mymms Drive Brookmans Park AL9 7AA

  6/2026/0525/FULL Submitted 23 Mar 2026 100 yards away

  Erection of a new dwelling following demolition of the existing building

  Refused Full applications New dwelling Demolition
  Domestic

• 55 Mymms Drive Brookmans Park AL9 7AE

  6/2022/2827/HOUSE Submitted 14 Dec 2022 100 yards away

  Erection of rear conservatory

  Granted Householder Extension
  Small domestic

• 47 Georges Wood Road Hatfield AL9 7BX

  6/2021/1248/LAWP Submitted 19 Apr 2021 150 yards away

  Certificate of lawfulness for garage conversion with pitched roof, replacing conservatory flat roof to pitched roof and insertion of roof lights into pitched roof across the garage and conservatory.

  Granted Lawful development Extension Loft or dormer 4 docs

• 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