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Grenville St Marys Hill Ascot SL5 9AP

25/03261/FULLFullApproved

Approved on 29 January 2026

Council decision: Application PermittedDelegated (officer decision)

Approximate site (title boundary)
Boundary © HM Land Registry, © Ordnance Survey · details

This information is subject to Crown copyright and database rights 2026 and is reproduced with the permission of HM Land Registry. The polygons (including the associated geometry, namely x, y co-ordinates) are subject to Crown copyright and database rights 2026 Ordnance Survey AC0000851063. Conditions of use.

Proposal

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

Received
10 December 2025
Decision level
Delegated (officer decision)
Ward
Ascot & Sunninghill
  1. Received10 Dec
  2. Validated10 Dec
  3. Consult.13 Jan
  4. Target4 Feb
  5. Decided29 Jan

Decided in 50 days (council typically 56)

About this application

This is a full planning application for demolition at Grenville St Marys Hill Ascot SL5 9AP. Windsor has handled 1,391 applications of this type. This one was decided in 50 days, 6 days quicker than Windsor's typical decision time. The site is in a conservation area. There have been 6 other applications at this address. In the past year there have been 92 applications across Ascot & Sunninghill. We hold 1,448 applications in total for the SL5 postcode area.

68% of full applications at Royal Borough of Windsor and Maidenhead were approved. Across all application types, the council typically decides in about 8 weeks (median).

Based on decided applications received in the last 3 years.Planning something similar? See what gets approved on your street

Application details

Postcode
SL5 9AP
Application type
Full
Scale / size
Small
Parish
Sunninghill And Ascot Parish

Planning application dates

Date validated
10 December 2025
Consultation expiry
13 January 2026
Neighbour consultation end
13 January 2026
Last date for comments
13 January 2026
Target decision date
4 February 2026

Applicant and agent

Agent address
Urban Curve Architecture The Stallion Box Raywood Office Complex Leacon Lane Charing TN27 0ET

Planning decision

Statutory period
56 days

Additional information

Planning Portal ID
PP-14551756
Documents
15

Site constraints

Checking the site
2/3
Council recordsAppealsFlood risk

Designations that overlap or adjoin the site outline.

  • Flood zone 1: Low probability (rivers and sea)

Not published by this council, so not checked: conservation areas, Article 4 directions and tree preservation orders. Ask the council if these matter.

Also checked, none recorded (21)

flood storage areas, listed buildings, green belt, scheduled monuments, World Heritage Sites, World Heritage Site buffer zones, registered parks and gardens, registered battlefields, Heritage at Risk entries, nutrient neutrality catchments, national parks, National Landscapes, SSSIs, Special Areas of Conservation, Special Protection Areas, Ramsar sites, ancient woodland, national nature reserves, local nature reserves, heritage coasts and brownfield registers.

A guide only, from official open data; it is not a planning search. Flood zones cover rivers and sea, not surface water.

Data © Crown copyright and others · sources and licences

Contains public sector information from planning.data.gov.uk (MHCLG and local planning authorities), licensed under the Open Government Licence v3.0. © Crown copyright and database right 2026.

© Historic England 2026. Contains Ordnance Survey data © Crown copyright and database right 2026. The Historic England GIS Data contained in this material was obtained on 2026-11-03. The most publicly available up to date Historic England GIS Data can be obtained from HistoricEngland.org.uk.

© Natural England copyright. Contains Ordnance Survey data © Crown copyright and database right 2026.

© Environment Agency copyright and/or database right 2026. All rights reserved. Flood Map for Planning, Open Government Licence v3.0.

Contains Ordnance Survey data © Crown copyright and database right 2026.

Source: Office for National Statistics licensed under the Open Government Licence v.3.0. Contains OS data © Crown copyright and database right 2026.

Associated applications

  1. 2026
    10 Aug

    Non material amendment to planning permission 25/03261/FULL

    PendingNon-material amendmentAmendment26/01933/NMA
  2. 2025
    10 Dec

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

    This applicationApprovedFull25/03261/FULL

Planning history at this site

5 other applications at this property, newest first.

  1. 2025
    30 Oct

    Certificate of lawfulness to determine whether the proposed part garage conversion, single storey front, side…

    ApprovedCert of Lawfulness of Proposed Dev25/02872/CPD
  2. 2025
    6 Aug

    Single storey front extension, single storey side extension, single storey rear extension, single storey…

    RefusedFull25/02001/FULL
  3. 2023
    8 Nov

    Certificate of lawfulness to determine whether the proposed single storey side extension, single storey rear…

    ApprovedCert of Lawfulness of Proposed Dev23/02760/CPD
  4. 2023
    31 Oct

    Garage conversion, part single part two storey rear/side extension and alterations to fenestration following…

    ApprovedFull23/02689/FULL
  5. 2023
    11 Apr

    Alterations to front entrance canopy, single storey side extension, two storey side extension with 2no…

    RefusedFull23/00870/FULL

Source: Windsor

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