35 Hornbeam Spring Knebworth Hertfordshire SG3 6AY

1. 8 Apr 2026

   Received by North Hertfordshire

2. 22 Apr 2026

   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

• 2 Stockens Dell Knebworth Hertfordshire SG3 6BG

  24/01922/LDCP Submitted 28 Aug 2024 75m away

  Single storey rear extension

  Granted Lawful development Extension 7 docs
  Small domestic

• 64 Stockens Green Knebworth Hertfordshire SG3 6DQ

  26/01579/FPH Submitted 15 Jul 2026 92m away

  90% historically approved · decision due ~9 Sep

  Replace existing windows to front, side and rear elevations.

  Awaiting decision Windows or glazing

• 26 Stockens Dell Knebworth Hertfordshire SG3 6BG

  23/00052/FPH Submitted 9 Jan 2023 99m away

  First floor front extension

  Decided Householder Extension
  Domestic

• 28 Stockens Dell Knebworth Hertfordshire SG3 6BG

  23/00041/FPH Submitted 6 Jan 2023 101m away

  First floor front infill extension, single storey front extension and open sided front porch following demolition of existing front extension

  Decided Householder Extension Demolition
  Small domestic

• 19 Stockens Green Knebworth Hertfordshire SG3 6DQ

  24/01773/FPH Submitted 8 Aug 2024 119m away

  Part two storey and part first floor rear extension. Single storey side extensions following demolition of existing detached garage and alterations to fenestration.

  Withdrawn Householder Extension Demolition +1
  Small domestic

• 1 Deeping Close Knebworth Hertfordshire SG3 6BW

  21/01795/FPH Submitted 15 Jun 2021 131m away

  Single storey front porch extension, single storey side extension, raise eaves height, conversion and extension of existing detached side elevation garage/store to link to main dwellinghouse

  Decided Householder Extension 11 docs
  Small domestic

• 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