11 Oak Tree Gardens Knebworth Hertfordshire SG3 6EQ

1. 16 Aug 2024

   Received by North Hertfordshire

2. 1 Oct 2024

   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

• 27 Lytton Fields Knebworth Hertfordshire SG3 6BA

  26/01625/FPH Submitted 3 Aug 2026 49m away

  90% historically approved · decision due ~28 Sep

  Enlargement of existing front dormer windows and insertion of 2 no. front rooflights. Insertion of rear box dormer with 2 no. Juliette balconies. Replacement flat roof above existing rear element and demolition of existing conservatory. Front porch extension and alterations to fenestration.

  Awaiting decision Extension Loft or dormer +2
  Small domestic

• 27 Lytton Fields Knebworth Hertfordshire SG3 6BA

  26/01483/NMA Submitted 8 Jun 2026 49m away

  90% historically approved · decision due ~3 Aug

  No raising of roof required, flat roof dormers (as existing design), Juliette balconies to rear dormer, extension of porch roof and no single storey rear extension as non-material amendment to planning permission reference 25/03244/FPH granted on 12.02.2026).

  Decided Amendments Extension Loft or dormer
  Small domestic

• 2 Oak Tree Gardens Knebworth Hertfordshire SG3 6EQ

  22/03025/FPH Submitted 23 Nov 2022 67m away

  Part conversion of garage to provide home office including replacement door opening on side elevation

  Decided Householder 11 docs
  Domestic

• Caxton Villa 14 Park Lane Knebworth Hertfordshire SG3 6PF

  23/00009/FPH Submitted 6 Jan 2023 132m away

  Installation of additional vehicular crossover.

  Decided Householder 8 docs
  Domestic

• 25 Deards Wood Knebworth Hertfordshire SG3 6PG

  22/03259/FPH Submitted 22 Dec 2022 145m away

  Two storey side and rear extension, raise existing roof ridge height, replace existing windows and replace existing dormer windows following demolition of existing conservatory. Extend the existing driveway within the boundary and creation of vehicular crossover (as variation of previously approved Planning Permission 21/02945/FPH granted 26.01.2022)

  Decided Householder Extension Loft or dormer +3 14 docs
  Small domestic

• Deards End Farm 51 Park Lane Knebworth Hertfordshire SG3 6PH

  23/00394/LBC Submitted 7 Mar 2023 197m away

  Replace cementitious render on rear elevation with lime render on timber laths.

  Granted Heritage and listed buildings 7 docs

• 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