PL/25/3123/SA

1. 22 Aug 2025

   Received by Buckinghamshire

2. 10 Oct 2025

   Decision issued: Cert of Law PROPOSED-granted

3. 4 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

• PL/25/6622/CONDA Decided

  HM Prison Grendon Springhill Road Grendon Underwood Buckinghamshire HP18 0TL

  Application for approval of details subject to condition 37 (surface water drainage) relating to Planning Permission 21/02851/AOP (allowed on appeal 22/00125/REF)

  19 Dec 2025 42m away Conditions
• PL/25/2838/MDLA Awaiting decision

  HM Prison Grendon Springhill Road Grendon Underwood Buckinghamshire HP18 0TL

  Application to amend section 106 agreement to trigger for submission and approval of travel plan prior to occupation relating to 21/02851/AOP

  14 Aug 2025 92m away Conditions
• PL/26/01955/NMA Decided

  HM Prison Grendon Springhill Road Grendon Underwood Buckinghamshire HP18 0TL

  Proposed non-material amendment to planning permission 21/02851/AOP (allowed on appeal 22/00125/REF) (Outline Planning Application with all matters reserved except for access, layout and scale for the construction of a new Category C prison (up to 67,000 sqm GEA) within a secure perimeter fence together with access, parking, landscaping and associated engineering works) to allow for amendment to wording of Condition 26.

  10 Mar 2026 142m away Amendments
• 21/B2851//NON Decided

  Hm Prison Grendon Springhill Road Grendon Underwood Buckinghamshire HP18 0TL

  Proposed non-material amendment to permission for Outline Planning Application with all matters reserved except for access, layout and scale for the construction of a new Category C prison (up to 67,000 sqm GEA) within a secure perimeter fence together with access, parking, landscaping and associated engineering works granted under planning ref: 21/02851/AOP (allowed on appeal 22/00125/REF)

  15 Jul 2025 142m away Amendments
• PL/25/5758/MDLA Decided

  HM Prison Grendon Springhill Road Grendon Underwood Buckinghamshire HP18 0TL

  Application under Section 106 of the Town & Country Planning Act 1990 (as amended) to discharge planning obligation at First Schedule, Part 2, (Highway Works Delivery Programme) of the Section 106 Agreement for application 21/02851/AOP

  20 Nov 2025 203m away Conditions

• PL/26/01164/SA Refused

  64 Sandholme Steeple Claydon Buckinghamshire MK18 2QE

  Certificate of lawfulness for proposed dropped kerb.

  12 Feb 2026 Lawful development
• PL/26/01589/SA Refused

  3 Corn Mill Close Wing Buckinghamshire LU7 0PL

  Certificate of lawfulness for the proposed single storey rear extension and part garage conversion.

  25 Feb 2026 Lawful development
• PL/26/01721/SA Granted

  Burton House White Lion Road Little Chalfont Buckinghamshire HP7 9LP

  Certificate of lawfulness for the proposed change of use of building from Existing Office Building (Class E) to Veterinary Practice (Class E).

  2 Mar 2026 Lawful development
• PL/26/05515/SA Awaiting decision

  Dinton Hall Upton Road Dinton Buckinghamshire HP17 8UQ

  Certificate of lawfulness application for proposed crossover field access point.

  21 Jul 2026 Lawful development
• PL/26/05843/SA Awaiting decision

  Land at Springfield Farm, South Heath, Buckinghamshire

  Certificate of Proposed Lawful Development for the temporary storage of soil stockpiles at Springfield Farm field at South Heath, Buckinghamshire

  21 Jul 2026 Lawful development