Annexe At Cuckoo Hall 73 Park Lane Old Knebworth Hertfordshire SG3 6PP

1. 26 Jul 2024

   Received by North Hertfordshire

2. 4 Sep 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

• Annexe At Cuckoo Hall 73 Park Lane Old Knebworth Hertfordshire SG3 6PP

  26/00392/FP Submitted 27 Feb 2026 52m away

  Erection of one self-build dwelling including ancillary annexe following demolition of existing dwelling to including parking, hard and soft landscaping and installation of rear swimming pool.

  Decided Full applications New dwelling Demolition 22 docs
  Domestic

• The Cottage 73 Park Lane Old Knebworth Hertfordshire SG3 6PP

  24/02400/LDCP Submitted 24 Oct 2024 70m away

  Erection of single storey side and rear extension

  Granted Lawful development Extension 10 docs
  Small domestic

• The Cottage 73 Park Lane Old Knebworth Hertfordshire SG3 6PP

  24/02401/LDCP Submitted 24 Oct 2024 70m away

  Replace 3no garage doors with windows to facilitate conversion of existing detached garage into habitable accommodation

  Granted Lawful development Windows or glazing 10 docs

• The Cottage 73 Park Lane Old Knebworth Hertfordshire SG3 6PP

  24/02399/PNAA Submitted 24 Oct 2024 75m away

  Enlargement of detached bungalow by the construction of an additional storey to result in an overall height of 6.45 metres.

  Granted Prior approval 11 docs

• 77 Park Lane Old Knebworth Knebworth Hertfordshire SG3 6PP

  26/02039/FP Submitted 3 Sep 2026 260m away

  90% historically approved · decision due ~29 Oct

  Erection of one detached three-bedroom dwelling including detached double garage with Air Source Heat Pump and soft and hard landscaping works following demolition of existing detached structures.

  Awaiting decision Full applications Demolition
  Domestic

• 66 Park Lane Knebworth Hertfordshire SG3 6PW

  26/02012/DOC Submitted 10 Aug 2026 270m away

  99% historically approved · decision due ~5 Oct

  Details reserved by condition 7 (Archaeological Written Scheme of Investigation) of reserved matters application reference no 25/01658/RM granted 28.11.2025.

  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