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Planning application

Grenville St Marys Hill Ascot SL5 9AP

Refused Windsor and Maidenhead 23/00870/FULL Full

Works: Extension Demolition Windows or glazing Small domestic

Read from the description, not a valuation. How we read the register

Refused. Only the applicant can appeal, within the statutory time limit, and a revised scheme can be submitted instead.

Proposal

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.

As published by the council, reference 23/00870/FULL

Application record

Reference
23/00870/FULL
Type
Full
Status
Decided
Decision
Refused As published: Refuse
Received
11 Apr 2023
Validated
9 May 2023
Decided
29 Sep 2023
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 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
  • 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

Timeline

Dates from the published record

  1. 11 Apr 2023

    Received by Windsor and Maidenhead

  2. 9 May 2023

    Validated

    Checked as complete and ready for consideration.

  3. 29 Sep 2023

    Decision issued: Refuse

  4. 12 Sep 2026

    Added to PlanIndex

Documents

Plans, drawings, consultee responses and the officer's report

16 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.

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Open the documents

What this refusal means

Windsor and Maidenhead refused this application for the reasons on the decision notice; only the applicant can appeal, and refused schemes often return in revised form. 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 0.3 miles

  • 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

    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

  • 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

  • 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

  • 9 Norton Park Ascot SL5 9BW

    22/01753/FULL Submitted 29 Jun 2022 100 yards away

    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 docs
    Small domestic

In Windsor and Maidenhead

  • 26/00980/FULL Granted

    19 Linchfield Road Datchet Slough SL3 9NA

    Single storey rear extension

    Received 21 Apr, published by the council 25 Jul 2026 Full applications
  • 26/01706/FULL Granted

    Loraine 36 Forlease Road Maidenhead SL6 1RU

    Single storey rear extension to the main dwelling, partial demolition to existing garage with a relocated door, alterations to the patio and new steps

    Received 13 Jul, published by the council 31 Jul 2026 Full applications
  • 26/01675/FULL Granted

    59 Grove Road Windsor SL4 1HT

    Increase in height of the existing side boundary brick wall following the removal of the existing timber fencing and a reduction in height and new railings to the existing front/side boundary wall.

    Received 9 Jul, published by the council 25 Jul 2026 Full applications
  • 26/01265/FULL Granted

    107 Slough Road Datchet Slough SL3 9AQ

    Single storey rear extension and alterations to fenestration following the demolition of the existing rear element.

    Received 20 May, published by the council 25 Jul 2026 Full applications
  • 26/01700/FULL Granted

    4 Dhoon Rise Maidenhead SL6 1BS

    Garage conversion, front bay window and a single storey front/side extension.

    Received 13 Jul, published by the council 27 Jul 2026 Full applications