55 Mymms Drive Brookmans Park AL9 7AE

1. 14 Dec 2022

   Received by Welwyn Hatfield

2. 16 Dec 2022

   Validated

   Checked as complete and ready for consideration.

3. 10 Feb 2023

   Decision issued: Granted

4. 9 Aug 2026

   Added to PlanIndex

Permission has been granted, usually subject to conditions listed on the decision notice, some of which must be discharged before work starts. The decision notice on the council portal sets out exactly what was approved.

Work must normally begin within three years of the decision or the permission lapses. Neighbours cannot appeal a grant; challenging one means judicial review of how the decision was made, within tight time limits.

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

• 6 Calder Avenue Brookmans Park AL9 7AQ

  6/2021/1496/HOUSE Submitted 11 May 2021 55m away

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

  Granted Householder Extension
  Small domestic

• 9 Calder Avenue Brookmans Park Hatfield AL9 7AH

  6/2021/1064/HOUSE Submitted 31 Mar 2021 114m 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

• 54 Mymms Drive Brookmans Park AL9 7AF

  6/2021/1145/COND Submitted 8 Apr 2021 119m 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

• 73 Mymms Drive Brookmans Park AL9 7AA

  6/2026/0525/FULL Submitted 23 Mar 2026 157m away

  Erection of a new dwelling following demolition of the existing building

  Refused Full applications New dwelling Demolition
  Domestic

• 44 Mymms Drive Brookmans Park AL9 7AF

  6/2024/1824/COND Submitted 23 Sep 2024 192m away

  Submission of details pursuant to condition number 3 (Hard and Soft Landscaping) on planning permission 6/2021/1339/FULL

  Granted Conditions

• 47 Georges Wood Road Hatfield AL9 7BX

  6/2021/1248/LAWP Submitted 19 Apr 2021 222m 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

• 6/2026/1228/HOUSE Granted

  109 Mount Way Welwyn Garden City AL7 4LA

  Erection of single storey front extension

  13 Jul 2026 Householder
• 6/2026/1011/HOUSE Granted

  5 Brookside Crescent Cuffley Potters Bar EN6 4QW

  Erection of rear extension, single storey side extension, new porch, additions/alterations to windows on side elevation and demolition of garage

  9 Jun 2026 Householder
• 6/2026/0703/HOUSE Granted

  57 Great North Road Brookmans Park AL9 6LA

  Erection of part double part single storey rear extension, single storey front porch extension, raising of roof and eaves to accommodate loft conversion, alterations to materials and fenestration, erection of front boundary wall and gates

  20 Apr 2026 Householder
• 6/2026/0534/HOUSE Refused

  16 Chipmunk Chase Hatfield AL10 9GH

  Retention of single storey rear extension and garage conversion to study/office

  24 Mar 2026 Householder
• 6/2026/1175/HOUSE Granted

  5A Honeycroft Welwyn Garden City AL8 6HR

  Erection of a single storey rear extension, alterations to opening on side elevation and garden room with covered area following demolition of conservatory

  7 Jul 2026 Householder