Knebworth House Knebworth Park Old Knebworth Knebworth Hertfordshire SG3 6PY

1. 14 Feb 2023

   Received by North Hertfordshire

2. 23 May 2023

   Decision issued: Consent

3. 3 Oct 2026

   Added to PlanIndex

North Hertfordshire granted permission on 23 May 2023, subject to any conditions on the decision notice. Work must normally begin within three years or the permission lapses. More in our guide to what happens after a planning decision.

Listed building consent is needed for works that affect the special interest of a listed building, and carrying out such works without it is a criminal offence. More in our guide to planning application types.

• Knebworth Estate Knebworth Park Old Knebworth Knebworth Hertfordshire SG3 6PY

  21/00290/FP Submitted 28 Jan 2021 400 yards away

  Temporary use of land for film making with associated temporary set and supporting facilities vehicles, access, parking and storage for 23 weeks alongside the temporary removal of part of an existing bund

  Granted Full applications 20 docs

• Larch House Old Knebworth Lane Knebworth Hertfordshire SG3 6FS

  26/00817/FPH Submitted 27 Mar 2026 450 yards away

  Insertion of front bay window following removal of existing garage doors to facilitate garage conversion into habitable accommodation. Front entrance porch and installation of side canopy. Insertion of rooflights to existing rear element roofslope. Alterations to fenestration. Erection of boundary wall/railings and installation of entrance gates.

  Granted Householder Extension Loft or dormer +1 12 docs
  Small domestic

• Larch House Old Knebworth Lane Knebworth Hertfordshire SG3 6FS

  26/00424/FPH Submitted 2 Mar 2026 450 yards away

  Erection of four bay cartlodge with habitable accommodation at first floor and external staircase following demolition of existing stables and store.

  Granted Householder Demolition 11 docs
  Domestic

• Larch House Old Knebworth Lane Knebworth Hertfordshire SG3 6FS

  26/02332/TCA Submitted 16 Sep 2026 0.3 miles away

  R1: Robinia - Remove.

  Granted Trees

• Larch House Old Knebworth Lane Knebworth Hertfordshire SG3 6FS

  26/02210/NMA Submitted 2 Sep 2026 0.3 miles away

  External wall insulation and timber boarding added to east wall. Front door design updated, bi-fold doors changed to 6 doors and addiotnal rooflight added to landing outside bedroom 6 (as Non-Material Amendment to Planning Permission 26/00817/FPH granted 03.06.2026)

  Decided Amendments Loft or dormer Windows or glazing

• Crom Cottage Park Lane Old Knebworth Knebworth Hertfordshire SG3 6QA

  23/00789/LBC Submitted 31 Mar 2023 0.3 miles away

  Internal alterations together with replacement window frame (Item 9) and window lintels (Item 21) like-for-like.

  Granted Heritage and listed buildings Windows or glazing 11 docs

• 26/02065/LBC Decided

  The Elms The Causeway Therfield Royston Hertfordshire SG8 9PP

  Single storey side extension following partial demolition of existing rear west wall and interior alterations (variation to listed building consent ref: 24/00803/LBC granted 17.09.2024)

  Received 7 Sep, published by the council 9 Sep 2026 Heritage and listed buildings
• 26/01309/LBC Decided

  The Bull High Street Gosmore Hertfordshire SG4 7QG

  Single storey rear extension and first floor rear extension following demolition of existing rear elements. Alterations to fenestration and internal and external alterations (development already commenced).

  Received 19 May, published by the council 24 Jul 2026 Heritage and listed buildings
• 26/01796/LBC Decided

  46 Ridge Road Letchworth Garden City Hertfordshire SG6 1PN

  Single storey rear extension following demolition of existing lean-to

  Received 11 Aug, published by the council 12 Aug 2026 Heritage and listed buildings
• 26/01938/LBC Decided

  Hitchin Town Hall Brand Street Hitchin Hertfordshire SG5 1HX

  Decarbonisation works including provision of secondary glazing to existing windows, the provision of insulation to the roof void above the main hall, replacement of mechanical plant including the removal of gas boilers and the installation of Photovoltaic (PV) panels and Air Source Heat Pump (ASHP)

  Received 18 Aug, published by the council 28 Aug 2026 Heritage and listed buildings
• 26/01948/LBC Decided

  28 Rushby Mead Letchworth Garden City Hertfordshire SG6 1RU

  Install internal insulation to external walls, between suspended timber floor joists and between and over ceiling joists together with other internal alterations.

  Received 17 Aug, published by the council 18 Aug 2026 Heritage and listed buildings