346 St Leonards Road Windsor SL4 3DX

1. 15 Aug 2025

   Received by Windsor and Maidenhead

2. 28 Oct 2025

   Decision issued: Permitted Development

3. 11 Aug 2026

   Added to PlanIndex

Windsor and Maidenhead granted permission on 28 October 2025, 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.

A lawful development certificate is a legal determination that existing or proposed works do not need planning permission; the merits of the scheme are not considered. More in our guide to planning application types.

• 352 St Leonards Road Windsor SL4 3DX

  24/02818/PDXL Submitted 18 Nov 2024 30m away

  Single storey rear extension no greater than 4.00m in depth, 3.75m high with an eaves height of 3.00m.

  Granted Prior approval Extension 16 docs
  Small domestic

• 336 St Leonards Road Windsor SL4 3DX

  21/01083/FULL Submitted 7 Apr 2021 39m away

  Two storey side extension.

  Granted Full applications Extension 22 docs

• 363 St Leonards Road Windsor SL4 3DS

  26/01431/CPD Submitted 10 Jun 2026 52m away

  Certificate of lawfulness to determine whether the proposed 1no. front rooflight, 1no. L-shaped rear dormer with 1no. Juliet balcony and alterations to fenestration are lawful.

  Granted Lawful development Loft or dormer Windows or glazing 10 docs

• 21 Princess Avenue Windsor SL4 3LU

  21/02370/FULL Submitted 2 Aug 2021 134m away

  Single storey side/rear extension.

  Granted Full applications Extension 8 docs
  Small domestic

• 23 Upcroft Windsor SL4 3NH

  25/02842/NMA Submitted 28 Oct 2025 137m away

  Non material amendments to planning permission 25/01252/FULL for a change to part of the rear roof from pitched to flat.

  Granted Amendments 8 docs

• 33 Upcroft Windsor SL4 3NH

  21/00716/FULL Submitted 9 Mar 2021 138m away

  Single storey rear extension, garage conversion into habitable accommodation and x1 new rooflight following demolition of existing element.

  Withdrawn Full applications Extension Loft or dormer +1
  Small domestic

• 26/00501/CPU Refused

  143 Cookham Road Maidenhead SL6 7EU

  Certificate of lawfulness to determine whether the proposed use of the dwelling as a small childrens home for up to two children and two carers is lawful.

  25 Feb 2026 Lawful development
• 26/01763/CPU Refused

  Land At The Junction of Warners Hill And Dean Lane Cookham Maidenhead

  Certificate of lawfulness to determine whether the proposed use of the land as an orchard with mobile poultry run and polytunnel is lawful.

  17 Jul 2026 Lawful development
• 26/01615/CLU Granted

  Riding Court Farm Riding Court Riding Court Road Datchet Slough SL3 9JT

  Certificate of lawfulness to determine whether the existing units 'JKL' (use class B8) used for storage and distribution; unit 'AB' (use class B8) used for hiring, maintaining, and cleaning concrete screed and machinery and 'storage yard 2' (use class B8) used for the storage of scaffolding is lawful.

  1 Jul 2026 Lawful development
• 26/01581/CLD Granted

  The George Public House The Brewhouse The Green Holyport Road Holyport Maidenhead

  Certificate of lawfulness to determine whether the existing bollard is lawful.

  26 Jun 2026 Lawful development
• 26/02117/CPD Awaiting decision

  27 Tyrell Gardens Windsor SL4 4DH

  Certificate of lawfulness to determine whether the proposed garage conversion is lawful.

  26 Aug 2026 Lawful development