Grenville St Marys Hill Ascot SL5 9AP

26/01933/NMAPending Decision

Discharge / amendments

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.

Received: 10 August 2026
Council: Royal Borough of Windsor and Maidenhead

Approximate location: the centre of the postcode, not the exact property.

ReceivedSubmitted10 Aug
ValidatedValidated
Consult.Consultation
TargetTarget Date
DecidedDecided

This is a planning application for a rear extension at Grenville St Marys Hill Ascot SL5 9AP. Windsor has handled 4,812 applications of this type and approves 80% of them, typically deciding them in 56 days. It was submitted on 10 August 2026 and is still awaiting a decision. The site is in a conservation area. There have been 6 other applications at this address. We hold 1,396 applications in total for the SL5 postcode area.

Application Details

Reference

26/01933/NMA

Address

Grenville St Marys Hill Ascot SL5 9AP

Postcode

SL5 9AP

Local Authority

Windsor

Decision Status

Undecided

Applicant & Agent

Planning Application Dates

Date Submitted

10 August 2026

Planning Decision

Publicity

Appeal

Additional Information

Coordinates

51.398655, -0.662465

Enriching application data

2/3

Council recordsAppealsFlood risk

Source: Windsor

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Associated applications

2026
10 Aug
Non material amendment to planning permission 25/03261/FULL
This applicationPendingNon-material amendment26/01933/NMA
2025
10 Dec
Single storey front extension and single storey rear/side extension following demolition of existing elements.
ApprovedFullPart of25/03261/FULL

Planning history at this site

5 other applications at this property, newest first.

Planning constraints

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.

© 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 2026-10-09. The most publicly available up to date Historic England GIS Data can be obtained from HistoricEngland.org.uk.

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