Planning application
Grenville St Marys Hill Ascot SL5 9AP
Works: Extension Demolition Small domestic
Read from the description, not a valuation. How we read the register
Permission granted. Work must normally begin within three years of the decision or the permission lapses.
Proposal
Single storey front extension and single storey rear/side extension following demolition of existing elements.
As published by the council, reference 25/03261/FULL
Application record
- Reference
- 25/03261/FULL
- Type
- Full
- Status
- Decided
- Decision
- Application Permitted
- Received
- 10 Dec 2025
- Validated
- 10 Dec 2025
- Decided
- 29 Jan 2026
- Ward
- Ascot & Sunninghill
- Parish
- Sunninghill And Ascot Parish
- Decision by
- Delegated
- Postcode
- SL5 9AP
Site history
Applications at this address on the Windsor and Maidenhead register
This site has had 3 applications since 2025: 3 approved, 0 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.
-
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.
Timeline
Dates from the published record
-
10 Dec 2025
Received by Windsor and Maidenhead
-
29 Jan 2026
Decision issued: Application Permitted
-
11 Aug 2026
Added to PlanIndex
Related applications
Cases linked to this one on the register
1 later application on the register refers to this one:
-
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.
Documents
Plans, drawings, consultee responses and the officer's report
15 documents on file for this application
A planning file usually holds the application form, drawings and site plans, consultee responses, the officer's report and the decision notice.
Trade members open them from here.
Open the documentsWhat this grant of permission means
Windsor and Maidenhead granted permission on 29 January 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.
About full applications
A full application seeks permission for a complete, detailed proposal in one go, with siting, design, access and landscaping all fixed at this stage. More in our guide to planning application types.
Nearby applications
Within 500 metres
-
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.
Granted Lawful development Extension Windows or glazing 12 docsSmall domestic -
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.
Granted Amendments Extension Windows or glazing 10 docs -
Badgers Wood St Marys Hill Ascot SL5 9AP
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
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 docsSmall domestic -
9 Norton Park Ascot SL5 9BW
Single storey front and rear extensions with new chimney to the side elevation and alterations to fenestration.
Granted Full applications Extension Windows or glazing 12 docsSmall domestic -
18 Norton Park Ascot SL5 9BW
Non material amendments to planning permission 21/02746/FULL for the addition of a ground floor rear window to replace the existing patio door, addition of a front first floor window following the removal of the gable vent and an increase in size of the first floor rear window.
Granted Amendments Windows or glazing 11 docs
Other full applications
In Windsor and Maidenhead
-
26/00685/FULL Granted
Blossoms Broomfield Park Sunningdale Ascot SL5 0JT
Relocation of front entrance door, new front canopy, single storey side infill extension, part single part two storey rear extension, first floor side extension, 1no. front dormer and alterations to fenestration and external finishes following demolition of existing elements.
-
26/01566/FULL Refused
20 Victoria Road Eton Wick Windsor SL4 6LY
New front boundary treatment, piers and gates (part retrospective).
-
26/01732/FULL Granted
27 Hemsdale Maidenhead SL6 6SL
Enlargement and conversion of the existing garage, single storey side/rear extension and alterations to fenestration.
-
26/01676/FULL Granted
51 Upper Village Road Ascot SL5 7AJ
Single storey side/rear extension.
-
26/01227/FULL Granted
92 Kennel Ride Ascot SL5 7NW
Two storey side extension with canopy, single storey rear extension alterations to fenestration and a detached outbuilding ancillary to the main dwelling.