Planning application
Grenville St Marys Hill Ascot SL5 9AP
Works: Extension Windows or glazing
Relates to 25/03261/FULL
Permission granted. Work must normally begin within three years of the decision or the permission lapses.
Proposal
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.
As published by the council, reference 26/01933/NMA
Application record
- Reference
- 26/01933/NMA
- Type
- Non-material Amendment
- Status
- Decided
- Decision
- Application Permitted
- Received
- 5 Aug 2026
- Validated
- 10 Aug 2026
- Decided
- 2 Sep 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.
-
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.
-
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
-
5 Aug 2026
Received by Windsor and Maidenhead
-
10 Aug 2026
Validated
Checked as complete and ready for consideration.
-
16 Aug 2026
Added to PlanIndex
-
2 Sep 2026
Decision issued: Application Permitted
Related applications
Cases linked to this one on the register
-
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.
Documents
Plans, drawings, consultee responses and the officer's report
10 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 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.
About amendment applications
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.
Nearby applications
Within 500 metres
-
Grenville St Marys Hill Ascot SL5 9AP
Single storey front extension and single storey rear/side extension following demolition of existing elements.
Granted Full applications Extension Demolition 15 docsSmall domestic -
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 -
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 amendment applications
In Windsor and Maidenhead
-
26/01996/NMA Granted
Leigh Cottage Church Road Sunningdale Ascot SL5 0NJ
Non material amendments to planning permission 25/02661/FULL for 1no. additional window to west elevation.
-
26/01388/VAR Granted
21 Springfield Park Maidenhead SL6 2YN
Variation (under Section 73) of Condition 3 to substitute those plans approved under 25/03049/FULL for a Garage conversion, single storey front porch, single storey rear/side extension and alterations to fenestration with amended plans.
-
26/01811/NMA Granted
Grove Park Industrial Estate Waltham Road White Waltham Maidenhead SL6 3LW
Non material amendments to planning permission 25/01083/VAR for changes to the proposed elevations and materials to plots 10-11, 15-16, 18-19, 24-25, 26-27, 28-29, 39-41, 42-44 and 45-47 and 48-51.
-
25/00668/VAR Granted
59 Norden Road Maidenhead SL6 4AZ
Variation (under Section 73) of Condition 15 to substitute those plans approved under 23/00279/FULL for 4 no. flats with associated parking, cycle and refuse storage and new access following the demolition of the existing dwelling with amended plans.
-
26/01154/VAR Granted
106 - 114 High Street Maidenhead
Variation (under Section 73) of planning permission 20/03508/OUT as amended by 26/00842/NMA to allow for the alteration of the List of approved drawings condition (3), as well as documents associated with condition 9 (Surface water drainage scheme), 12 (Air quality report) 16 (Retail units/use class) and 19 (Acoustic measures).