Grenville St Marys Hill Ascot SL5 9AP

This site has had 4 applications since 2023: 3 approved, 1 refused.

• 26/01933/NMA Granted

  Grenville St Marys Hill Ascot SL5 9AP

  Non material amendment to planning permission 25/03261/FULL for a reduction in the width and height of the side extension, increase in depth of side and rear extension and alterations to existing and proposed fenestration.

  Decided 2 Sep 2026 Amendments
• 25/03261/FULL Granted

  Grenville St Marys Hill Ascot SL5 9AP

  Single storey front extension and single storey rear/side extension following demolition of existing elements.

  Decided 29 Jan 2026 Full applications
• 23/00870/FULL Refused

  Grenville St Marys Hill Ascot SL5 9AP

  Alterations to front entrance canopy, single storey side extension, two storey side extension with 2no. Juliet balconies, new external front wall, 1no. EV charger, alterations to fenestration, external finishes and access and new dropped kerb following demolition of existing side element.

  Decided 29 Sep 2023 Full applications

1. 30 Oct 2025

   Received by Windsor and Maidenhead

2. 3 Nov 2025

   Validated

   Checked as complete and ready for consideration.

3. 23 Dec 2025

   Decision issued: Permitted Development

4. 11 Aug 2026

   Added to PlanIndex

Windsor and Maidenhead granted permission on 23 December 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.

• Grenville St Marys Hill Ascot SL5 9AP

  25/03261/FULL Submitted 10 Dec 2025 50 yards away

  Single storey front extension and single storey rear/side extension following demolition of existing elements.

  Granted Full applications Extension Demolition 15 docs
  Small domestic

• Grenville St Marys Hill Ascot SL5 9AP

  26/01933/NMA Submitted 5 Aug 2026 50 yards away

  Non material amendment to planning permission 25/03261/FULL for a reduction in the width and height of the side extension, increase in depth of side and rear extension and alterations to existing and proposed fenestration.

  Granted Amendments Extension Windows or glazing 10 docs

• Grenville St Marys Hill Ascot SL5 9AP

  23/00870/FULL Submitted 11 Apr 2023 50 yards away

  Alterations to front entrance canopy, single storey side extension, two storey side extension with 2no. Juliet balconies, new external front wall, 1no. EV charger, alterations to fenestration, external finishes and access and new dropped kerb following demolition of existing side element.

  Refused Full applications Extension Demolition +1 16 docs
  Small domestic

• Badgers Wood St Marys Hill Ascot SL5 9AP

  19/03175/NMA Submitted 14 Nov 2019 100 yards away

  Non material amendments to planning permission 19/01913/FULL for the increase in size of the ground floor to bring it into line with the front of the main house.

  Granted Amendments 5 docs

• 18 Norton Park Ascot SL5 9BW

  21/02746/FULL Submitted 9 Sep 2021 100 yards away

  Part single/part two storey front/side extension, single storey rear extension, single storey side extension, garage conversion into habitable accommodation and alteration to fenestration.

  Granted Full applications Extension Windows or glazing 15 docs
  Small domestic

• 9 Norton Park Ascot SL5 9BW

  23/01226/FULL Submitted 18 May 2023 100 yards away

  Single storey front/side extension, two single storey rear extensions, new chimney and alterations to fenestration.

  Granted Full applications Extension Windows or glazing 12 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