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Grenville St Marys Hill Ascot SL5 9AP

23/02760/CPDCert of Lawfulness of Proposed DevApproved
Outline / PiP

Approved on 5 December 2023

Council decision: Permitted DevelopmentDelegated (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

Certificate of lawfulness to determine whether the proposed single storey side extension, single storey rear extension, new front entance canopy, alterations to fenestration, hardstanding and drop kerb is lawful.

Received
8 November 2023
Decision level
Delegated (officer decision)
Ward
Ascot & Sunninghill
  1. Received8 Nov
  2. Validated10 Nov
  3. Consult.
  4. Target5 Jan
  5. Decided5 Dec

Decided in 25 days (council typically 56)

About this application

This is an outline application for a single storey rear extension at Grenville St Marys Hill Ascot SL5 9AP. Windsor has handled 644 applications of this type. This one was decided in 27 days, 4 weeks 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.

67% of outline 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
Cert of Lawfulness of Proposed Dev
Scale / size
Small
Parish
Sunninghill And Ascot Parish

Planning application dates

Date validated
10 November 2023
Target decision date
5 January 2024

Applicant and agent

Agent address
ATDesigned Ltd 25 Woodend Drive Ascot SL5 9BD

Planning decision

Statutory period
56 days

Additional information

Planning Portal ID
PP-12586645
Documents
11

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.

Planning history at this site

6 other applications at this property, newest first.

  1. 2026
    10 Aug

    Non material amendment to planning permission 25/03261/FULL

    PendingNon-material amendment26/01933/NMA
  2. 2025
    10 Dec

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

    ApprovedFull25/03261/FULL
  3. 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
  4. 2025
    6 Aug

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

    RefusedFull25/02001/FULL
  5. 2023
    31 Oct

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

    ApprovedFull23/02689/FULL
  6. 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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