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 50 yards 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 50 yards away

  Two storey side extension.

  Granted Full applications Extension 22 docs

• 336 St Leonards Road Windsor SL4 3DX

  20/01540/FULL Submitted 29 Jun 2020 50 yards away

  Two storey side extension with habitable accommodation in roof space, 1 No. first floor rear window and 2 No. rear rooflights.

  Refused Full applications Extension Loft or dormer +1 20 docs

• 363 St Leonards Road Windsor SL4 3DS

  26/01431/CPD Submitted 10 Jun 2026 50 yards 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

• 37 Princess Avenue Windsor SL4 3LU

  20/03491/FULL Submitted 23 Dec 2020 100 yards away

  Single storey side extension and alterations to first floor side fenestration.

  Refused Full applications Extension Windows or glazing 17 docs
  Small domestic

• 21 Princess Avenue Windsor SL4 3LU

  21/02370/FULL Submitted 2 Aug 2021 150 yards away

  Single storey side/rear extension.

  Granted Full applications Extension 8 docs
  Small domestic

• 26/02222/CPD Refused

  52 Audley Way Ascot SL5 8EF

  Certificate of lawfulness to determine whether the proposed single storey rear extension following the removal of the existing conservatory is lawful.

  Received 8 Sep, published by the council 24 Sep 2026 Lawful development
• 26/01954/CPD Withdrawn

  Mulberry House Waltham Road Maidenhead SL6 3NH

  Certificate of lawfulness to determine whether the single storey rear extension is lawful.

  Received 7 Aug, published by the council 16 Aug 2026 Lawful development
• 26/01856/CLU Granted

  Apple Tree Cottage And Land Adjacent To Apple Tree Cottage Paley Street Maidenhead

  Certificate of lawfulness to determine whether the existing use of the land as a residential garden incidental to the main dwelling is lawful

  Received 28 Jul, published by the council 24 Aug 2026 Lawful development
• 26/02022/CPD Refused

  14 Church View White Waltham Maidenhead SL6 3JQ

  Certificate of lawfulness to determine whether the proposed 1no. rear dormer and alterations to fenestration are lawful

  Received 17 Aug, published by the council 2 Sep 2026 Lawful development
• 26/01862/CLU Granted

  Holyport Pre School Holyport Youth Club Moneyrow Green Holyport Maidenhead SL6 2NA

  Certificate of lawfulness to determine whether the existing use of the site as a pre-school is lawful.

  Received 29 Jul, published by the council 4 Aug 2026 Lawful development