Grenville St Marys Hill Ascot SL5 9AP

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

• 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
• 25/02872/CPD Granted

  Grenville St Marys Hill Ascot SL5 9AP

  Certificate of lawfulness to determine whether the proposed part garage conversion, single storey front, side and rear extensions, 1no. outbuilding incidental to the main dwelling and alterations to fenestration are lawful.

  Decided 23 Dec 2025 Lawful development
• 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. 5 Aug 2026

   Received by Windsor and Maidenhead

2. 10 Aug 2026

   Validated

   Checked as complete and ready for consideration.

3. 16 Aug 2026

   Added to PlanIndex

4. 2 Sep 2026

   Decision issued: Application Permitted

• 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

Windsor and Maidenhead granted permission on 2 September 2026, 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.

An amendment application makes limited changes to a permission that already exists; anything beyond modest adjustment needs a fresh application. 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

  25/02872/CPD Submitted 30 Oct 2025 50 yards away

  Certificate of lawfulness to determine whether the proposed part garage conversion, single storey front, side and rear extensions, 1no. outbuilding incidental to the main dwelling and alterations to fenestration are lawful.

  Granted Lawful development Extension Windows or glazing 12 docs
  Small domestic

• 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

• 26/00814/VAR Granted

  Land West of Switchback Road North And North of Nightingale Lane Maidenhead

  Variation (under Section 73a) of planning permission 21/02963/FULL to vary the wording of Condition 8 (Drainage), 9 (Vehicles), 10 (Landscaping) and 11 (Painting) without complying with one month time limit.

  Received 27 Mar, published by the council 25 Jul 2026 Amendments
• 26/01411/VAR Granted

  Whiteladies Park Prince Albert Drive Ascot SL5 8AQ

  Variation (under Section 73) of Condition 11 to substitute those plans approved under 25/03016/FULL for the Redevelopment of existing dwelling, including demolition and reconstruction of western extension, the construction of an eastern extension including an indoor swimming pool, and creation of a basement area with amended plans.

  Received 8 Jun, published by the council 25 Jul 2026 Amendments
• 26/01792/VAR Granted

  Silver Birches St Marys Road Ascot SL5 9JE

  Variation (under Section 73) of Condition 9 (Approved Plans) to substitute those plans approved under 26/00205/FULL for a raised ridge, 2 no. front dormers and 1 no. rear dormer, 1no. side bay window, new chimney, single storey side/rear extension, alterations to fenestration and hardstanding, following demolition of existing elements with amended plans.

  Received 22 Jul, published by the council 31 Jul 2026 Amendments
• 26/02420/NMA Awaiting decision

  Development At King Street And Queen Street And Broadway Maidenhead

  Non material amendments to planning permission 25/00066/VAR as per covering letter.

  Received 2 Oct, published by the council 9 Oct 2026 Amendments
• 26/02152/NMA Granted

  Land Bounded By Ascot Fire Station Station Hill And West of Hermitage Parade And South of High Street Ascot SL5 7HF

  Non material amendments to planning permission 25/01050/FULL to amend the wording of Condition 8 (Bat Mitigation Scheme).

  Received 1 Sep, published by the council 8 Sep 2026 Amendments