57 Highfield Letchworth Garden City Hertfordshire SG6 3PY

1. 16 Jan 2023

   Received by North Hertfordshire

2. 28 Feb 2023

   Decision issued: Granted

3. 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.

A lawful development certificate is a legal determination, not a planning judgement. It asks the council to confirm either that existing use or works are lawful, often through the passage of time, or that a proposal would not need planning permission at all. The applicant must prove the facts; the merits of the scheme are not considered.

More on lawful development applications in our guide

• 55 Highfield Letchworth Garden City Hertfordshire SG6 3PY

  21/00818/FPH Submitted 15 Mar 2021 13m away

  Single storey rear extension (as amended by plans received 8th July 2021)

  Decided Householder Extension 5 docs
  Small domestic

• School House Highfield Letchworth Garden City Hertfordshire SG6 3PY

  26/01996/FPH Submitted 24 Aug 2026 80m away

  90% historically approved · decision due ~19 Oct

  Part two storey and part single storey rear extension and open-sided front porch following demolition of existing porch and rear element. Alterations to fenestration and external rendering.

  Awaiting decision Extension Demolition +1
  Small domestic

• 66 Highfield Letchworth Garden City Hertfordshire SG6 3PZ

  26/01891/FPH Submitted 29 Jul 2026 83m away

  90% historically approved · decision due ~23 Sep

  Replace garage door with window and raise flat roof of garage to facilitate conversion of attached garage into habitable accommodation.

  Awaiting decision Windows or glazing

• 42 Highfield Letchworth Garden City Hertfordshire SG6 3PZ

  26/00296/FPH Submitted 8 Apr 2026 109m away

  Two storey rear extension and alterations to existing garage including raising roof height to facilitate garage conversion. Alterations to fenestration throughout including insertion of first floor side window.

  Decided Householder Extension Windows or glazing 6 docs
  Small domestic

• 28 Oaktree Close Letchworth Garden City Hertfordshire SG6 3XY

  22/02921/LDCP Submitted 10 Nov 2022 161m away

  Replace front elevation door and insertion of window to existing side elevation of attached garage to facilitate partial conversion of garage into habitable accommodation. Replace existing front entrance door.

  Granted Lawful development Windows or glazing

• Highfield School Highfield Letchworth Garden City Hertfordshire SG6 3QA

  26/01935/DOC Submitted 3 Aug 2026 216m away

  99% historically approved · decision due ~28 Sep

  Details reserved by Condition 4 (BNG) of planning permission reference 25/01830/FP granted on 10.03.2026.

  Awaiting decision Conditions

• 26/01469/LDCP Granted

  30 Pirton Road Hitchin Hertfordshire SG5 2BD

  Single storey rear extension. Extension to rear patio.

  5 Jun 2026 Lawful development
• 26/01459/LDCP Granted

  80 Balmoral Road Hitchin Hertfordshire SG5 1XQ

  Single storey rear extension and insertion of three rooflights to existing rear element. Front porch extension.

  4 Jun 2026 Lawful development
• 26/01426/LDCP Granted

  25 Balmoral Road Hitchin Hertfordshire SG5 1XG

  Insertion of rear box dormer and installation of 3 rooflights to front roof slope to facilitate conversion of loft space to habitable accommodation.

  2 Jun 2026 Lawful development
• 26/01301/LDCP Granted

  47 Bingen Road Hitchin Hertfordshire SG5 2PR

  Single storey rear extension and alterations to existing fenestration.

  2 Jun 2026 Lawful development
• 26/01247/LDCP Granted

  47 Bedford Road Hitchin Hertfordshire SG5 2TP

  Erection of single storey detached outbuilding.

  20 May 2026 Lawful development