6 Calder Avenue Brookmans Park Hertfordshire AL9 7AQ

1. 3 Feb 2023

   Received by Welwyn Hatfield

2. 7 Mar 2023

   Validated

   Checked as complete and ready for consideration.

3. 15 May 2023

   Decision issued: Granted

4. 14 Sep 2026

   Added to PlanIndex

Welwyn Hatfield granted permission on 15 May 2023, 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 2m away

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

  Granted Householder Extension
  Small domestic

• 55 Mymms Drive Brookmans Park AL9 7AE

  6/2022/2827/HOUSE Submitted 14 Dec 2022 53m away

  Erection of rear conservatory

  Granted Householder Extension
  Small domestic

• 9 Calder Avenue Brookmans Park Hatfield AL9 7AH

  6/2021/1064/HOUSE Submitted 31 Mar 2021 61m away

  Erection of part single, part two storey front extension; two storey side extension; part single, part two storey rear extension; garage conversion; enlargement of roof; insertion of side and rear rooflights; and front facade alterations.

  Granted Householder Extension Loft or dormer
  Small domestic

• 73 Mymms Drive Brookmans Park AL9 7AA

  6/2026/0525/FULL Submitted 23 Mar 2026 122m away

  Erection of a new dwelling following demolition of the existing building

  Refused Full applications New dwelling Demolition
  Domestic

• 54 Mymms Drive Brookmans Park AL9 7AF

  6/2021/1145/COND Submitted 8 Apr 2021 162m away

  Submission of details pursuant to condition numbers 3 (sample materials) and 5 (details of external rear balcony screening) on planning permission S6/2015/0228/FP

  Granted Conditions

• 47 Georges Wood Road Hatfield AL9 7BX

  6/2021/1248/LAWP Submitted 19 Apr 2021 176m 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

• 6/2026/1198/HOUSE Granted

  9 Mardley Hill Welwyn AL6 0UE

  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

  Received 10 Jul, published by the council 24 Jul 2026 Householder
• 6/2026/1257/HOUSE Granted

  21 The Swallows Welwyn Garden City AL7 1BX

  Garage conversion with alterations to openings to front and rear elevations

  Received 17 Jul, published by the council 1 Aug 2026 Householder
• 6/2026/1293/HOUSE Granted

  33 Claves Crescent Welwyn Garden City AL7 1WN

  Erection of a single storey rear conservatory

  Received 22 Jul, published by the council 1 Aug 2026 Householder
• 6/2026/1202/HOUSE Granted

  40 Cecil Crescent Hatfield AL10 0HG

  Erection of single storey rear extension

  Received 10 Jul, published by the council 9 Aug 2026 Householder
• 6/2026/1228/HOUSE Granted

  109 Mount Way Welwyn Garden City AL7 4LA

  Erection of single storey front extension

  Received 13 Jul, published by the council 9 Aug 2026 Householder